This article investigates factors affecting the contributions of battery units to fault currents in grid-connected battery storage systems (BSSs). The work in this article is intended to examine the effects of the state-of-charge (SOC) on... more
This article investigates factors affecting the contributions of battery units to fault currents in grid-connected battery storage systems (BSSs). The work in this article is intended to examine the effects of the state-of-charge (SOC) on battery currents that are drawn due to faults. This article also examines the impacts of charger controller actions on the currents drawn from battery units to faults in grid-connected BSSs. The impacts of the SOC and charger controller on battery currents due to faults are examined for the lead-acid, lithium-ion, and nickel–cadmium battery units. Examination results show that the battery currents due to faults are directly dependent on the SOC. Moreover, these results show that actions of charger controller can support the battery terminal voltage, thus preventing the fast reduction of the SOC. The support of the battery terminal voltage helps in limiting the currents drawn from battery units during faults. The effects of the SOC and charger controller are verified using a 1-MW, 3ϕ grid-connected BSS, which has lead-acid battery units. Several faults have been created during charging and discharging operations, and at different values of SOC. Test results confirm the direct dependence of battery currents (due to faults) on the SOC. In addition, obtained results demonstrate the ability of charger controller to limit the currents drawn from battery units due to faults in different parts of a grid-connected BSS.
Research Interests:
This article develops a survivability-based protection for three-phase induction motor drive ( 3ϕ IMDs) systems against severe dynamic events. The developed protection is based on defining a survivability index ΓIMD , which is formulated... more
This article develops a survivability-based protection for three-phase induction motor drive ( 3ϕ IMDs) systems against severe dynamic events. The developed protection is based on defining a survivability index ΓIMD , which is formulated in terms of the change in power created by a dynamic event experienced by a 3ϕ IMD. The determination of ΓIMD provides an accurate tool to detect, identify, and respond to unsurvivable dynamic events. The efficacy and validity of the survivability-based protection for 3ϕ IMDs are verified through simulation and experimental tests. These tests are conducted for 10 hp 3ϕ IMD under various types of dynamic events. Test results demonstrate the effectiveness of the survivability-based protection in responding to unsurvivable dynamic events to prevent damage to different components in a 3ϕ IMD
Research Interests:
This article presents the implementation and performance testing of a bus-differential protection for buses, which interconnect battery storage systems (BSSs). The proposed bus-differential protection is based on employing the αβ0... more
This article presents the implementation and performance testing of a bus-differential protection for buses, which interconnect battery storage systems (BSSs). The proposed bus-differential protection is based on employing the αβ0 components of the apparent powers flowing in all branches of the protected bus. The αβ0 components of the apparent powers are employed due to their ability to accommodate changes in the power flow direction in the branches connected to the protected bus. The apparent powers are determined using the measured voltage and currents in all branches connected to the protected bus. The proposed αβ0-based bus-differential protection is implemented and tested for internal and external faults, which are created during the charging and discharging of BSSs. Test results demonstrate the ability of the proposed αβ0-based bus-differential protection to initiate fast, accurate, and reliable responses to internal and external faults in the protected bus. Observed response features of the proposed protection are found to have minor sensitivity to the mode of operation of the BSS (charging and discharging), fault location (internal and external), and/or fault type.
Research Interests: Power System Protection, Power System Protection Engineering, Power System Reliability, Fault diagnosis, Fault location, and 7 moreCurrent Transformers, Circuit Breakers, Differential Protection, Battery Storage, Circuit faults, instantaneous three phase apparent powers, and Protection and Relaying For Power Systems
This article presents the development, implementation, and testing of a digital differential protection for three-phase (3φ) solid-state transformers (SSTs). The developed digital differential protection is designed to implement the ANSI... more
This article presents the development, implementation, and testing of a digital differential protection for three-phase (3φ) solid-state transformers (SSTs). The developed digital differential protection is designed to implement the ANSI 87 T protection function. The differential currents used by the developed protection are created by the dq0 components of the currents flowing in the high and low voltage sides of a 3φ SST. Internal faults are detected and identified using the energy contents of high-frequency subbands present in the dq0 differential currents. The desired high-frequency subbands are extracted using the phaselet transform that processes signals without sensitivity to nonstationary changes in their frequency and/or phases. Energy contents in the extracted high-frequency subbands allow accurate, fast, and reliable detection and identification of faults in any part of a 3φ SST. The proposed digital differential protection is implemented for performance testing using a laboratory 25-kVA 3φ SST. Performance results demonstrate accurate, fast, and reliable response to different fault and nonfault events. Furthermore, responses of the developed differential protection are found to be consistent regardless of the fault type, fault location, and/or loading level.
Research Interests:
This article presents the performance evaluation of the frame-angle-based (FAB) direct torque controller (DTC) for 3 phi induction motor drives (IMDs), which are fed by 3 phi six-pulse wavelet-modulated (WM) dc-ac power electronic... more
This article presents the performance evaluation of the frame-angle-based (FAB) direct torque controller (DTC) for 3 phi induction motor drives (IMDs), which are fed by 3 phi six-pulse wavelet-modulated (WM) dc-ac power electronic converters (PECs). The tested DTC is designed to adjust the d(e)- and q(e)-axis components of the voltages (v(ds)(e) and v(qs)(e)) applied to a 3 phi IMD. The adjustments in v(ds)(e) and v(qs)(e) are created in response to changes in the load torque, command torque, drive speed, and/or system parameters. Desired adjustments in v(ds)(e) and v(qs)(e) are set by regulating the angle. of the frame created by v(ds)(e) and v(qs)(e). This frame produces reference modulating signals that are required to generate WM switching pulses for operating the 3 phi dc-ac PEC in the IMD. The complete IMD system, incorporating the FAB-DTC, is implemented for a 10-hp IMD system for performance evaluation. Tests of the FAB-DTC for the 10-hp IMD are conducted for various changes in the load torque, command torque, drive speed, and system parameters. Simulation and experimental test results demonstrate fast, accurate, reliable, and dynamic responses with minor sensitivity to variations in system parameters.
Research Interests:
This article presents and tests the performance of a digital differential protection for three-phase (3 phi) converter transformers. The proposed digital differential protection is developed to comply with the ANSI 87T protection... more
This article presents and tests the performance of a digital differential protection for three-phase (3 phi) converter transformers. The proposed digital differential protection is developed to comply with the ANSI 87T protection procedure. The presented protection is featured with fault detection based on the energy contents of the high-frequency subbands of the d-q axis components of differential currents. Desired energy contents are extracted using the phaselet transform (PHT), which can process signalswithout sensitivity to the variations in their phase shifts. Energy contents of the high-frequency subbands offer accurate, fast, and reliable detection, and identification of internal faults in any part of a 3 phi converter transformer. The d-q PHT-based digital differential protection is implemented for performance evaluation using different 3 phi converter transformers, when feeding controlled rectifier units. Performance results demonstrate accurate, fast, and reliable detection, and response to different types of fault, and nonfault events. Response features of the developed differential protection are complimented with simple implementation, reduced computations, and minor sensitivity to phase shifts, fault location, and loading levels.
Research Interests:
This article presents a method to include fault currents in the reliability analysis of motor drives. The presented method is based on formulating a fault current matrix (FCM), the elements of which are values of the currents flowing in... more
This article presents a method to include fault currents in the reliability analysis of motor drives. The presented method is based on formulating a fault current matrix (FCM), the elements of which are values of the currents flowing in all parts of a motor drive. The FCM is processed using the principal component analysis (PCA) to determine the pattern of variations in all currents due to any failure event. The output of the PCA is used to determine the failure rates for all parts of a motor drive. Determined failure rates can provide a tool to set an adequate action (mitigation, maintenance, or shutdown) to ensure a reliable and safe operation during and post any failure events experienced by the motor drive. The validity and accuracy of the PCA-FCM method are verified by employing it in the reliability analysis of different motor drives with different ratings. Results demonstrate the advantages of including fault currents in setting adequate actions in response to possible failure events.
Research Interests:
This article develops, implements, and tests a method for selecting the locations and sizes of battery storage systems (BSSs) for power systems with distributed power generation. The developed method is based on calculating the coherency... more
This article develops, implements, and tests a method for selecting the locations and sizes of battery storage systems (BSSs) for power systems with distributed power generation. The developed method is based on calculating the coherency index for each bus to determine its contribution to the frequency of the center of inertia (COI) during and post a transient event. Once the coherency index is calculated for all buses, the principle component analysis (PCA) is used to identify the buses with consistent low values of the coherency index. These buses are considered as candidate locations for BSSs. In addition, the lowest values of the coherency index are used to determine the required sizes of BSSs to be connected at the buses with low contributions to the frequency of the COI. The performance of the PCA with COI (PCA-COI) method is evaluated for the Barbados power system for various transient events. Performance results show that BSSs (selected using the proposed method) can effectively improve the frequency stability with minor sensitivity to the levels of distributed power generation, loading levels, and/or type or location of transient events.
Research Interests:
This article develops and tests a controller for residential electric water heaters (EWHs). The developed controller is operated to maximize the energy stored in EWHs during off-peak-demand times, in order to reduce their power demands... more
This article develops and tests a controller for residential electric water heaters (EWHs). The developed controller is operated to maximize the energy stored in EWHs during off-peak-demand times, in order to reduce their power demands during peak-demand times. Desired control actions aim to adjust the minimum temperature settings of EWHs using the unit commitment (UC). In order to eliminate the need for a direct measurement of EWH power demands, the bus-split (BS) aggregation method is employed. The BS method is employed due to its ability to extract the power demands of an EWH from household power meter readings. The UC is formulated using the energy stored in a EWH as a cost function, which is to be maximized during the off-peak-demand time. The solution of the UC problem is obtained using the Lagrange relaxation method that can offer fast convergence and reduced computations. The BS-UC controller is implemented for performance testing using power meter readings that are collected from 150 residential households during the fall, winter, spring, and summer seasons. Test results demonstrate the ability of the BS-UC controller to provide accurate and effective control of EWHs, which are complimented by a minor sensitivity to the number controlled EWHs, hot water consumption, and seasonal variations in residential load power demands.
Research Interests:
Three-phase power transformers can have their windings configured to create local neutral points, which can be connected to ground. The grounding of a 3 phi power transformer is intended to limit ground currents (including fault currents)... more
Three-phase power transformers can have their windings configured to create local neutral points, which can be connected to ground. The grounding of a 3 phi power transformer is intended to limit ground currents (including fault currents) and limit ground potentials. These objectives can be translated into the resistive grounding that is usually designed based on system ratings and transformer parameters. The resistive grounding, however, can impact the flow of the harmonic components present in the exciting currents of a3 phi power transformer. As a result, undesired harmonic components are induced in primary and secondary voltages. This article presents the design and performance of a frequency-selective grounding that can achieve the objectives of grounding a 3 phi power transformer. The developed grounding is designed to provide a resistive path for low-frequency currents (faults), and to create a low impedance path for high-frequency currents (harmonics). The frequency-selective grounding is experimentally tested for a 3 phi power transformer with different primary and secondary winding configurations, different fault types, and source grounding. Test results show that the developed grounding can reduce the ground potential, harmonic distortion in primary and secondary voltages, and ground fault currents with a minimum interference with ground fault protective devices.
Research Interests:
Solid-state transformers (SSTs) have diverse designs and constructions that make them suitable for various industrial applications, including distributions systems. This new breed of transformers has been developed to support the typical... more
Solid-state transformers (SSTs) have diverse designs and constructions that make them suitable for various industrial applications, including distributions systems. This new breed of transformers has been developed to support the typical functionalities of core-type distribution transformers, along with new functionalities, such as controlling power flows, integrating dc distribution systems, utilizing distributed generation and storage units, supporting load-side voltage/frequency control, and improving the power quality. As SSTs become candidates for distribution systems, their deployment can pose challenges for distribution systems. Such challenges include the cost, protection, size and weight, efficiency, and adequate grounding designs. This article discusses some of the challenges that face the deployment of SSTs in distribution systems. In addition, this article provides a comparison between core-type and SST transformers for applications in distribution systems. The comparison between the transformers is made in terms of their efficiency, cost, and weight. Finally, this article makes several recommendations for future works that can further facilitate the deployment of SSTs in distribution systems.
Research Interests:
Research Interests:
This paper presents the development and performance evaluation of a compact-converter-based power supply for plasma dielectric barrier discharge (DBD) devices. The developed power supply is designed to meet weight and size requirements... more
This paper presents the development and performance evaluation of a compact-converter-based power supply for plasma dielectric barrier discharge (DBD) devices. The developed power supply is designed to meet weight and size requirements for applications in aeronautical systems. Multistage and multilevel switch-mode converters are employed to construct the power supply. The multistage part of the power supply is constructed from multiple dc-dc boost converters that have their inputs fed by rechargeable batteries. The outputs of the dc-dc converters are used to feed different levels of a single phase cascaded H-bridge (CHB) multilevel dc-ac converter. The switching signals for the CHB dc-ac converter are generated to facilitate the adjustments of the magnitude and/or frequency of the output voltage. Such adjustments are set to allow manipulating the generated plasma body force. A prototype for the multistage multilevel power supply is constructed for performance evaluation using a fiberglass DBD device. Performance results show an effective generation and control of plasma body force, which can be achieved by a modular, lightweight, and compact size power supply.
Research Interests: Dc-Dc Converters, Power Electronics, Dc-Dc Converters, Design of high frequency power supplies for Dielectric barrier discharge applications, Switched Mode Power Supplies, AC / DC Power Supplies, and 13 moreFrequency Control, Plasma Devices And Applications, Electrodes, Power Supplies, Dielectric Materials, Dielectric Devices, Design of Dc/dc Boost Converters, Electric Potential, AC-DC Power Convertors, plasma DBD devices, CHB dc-ac converter, generated plasma body force, and multistage multilevel power supply
This paper presents the application of the multiframe digital interconnection protection for cogeneration systems. The multiframe digital interconnection protection is constructed from two frequency main frames; one frame to detect... more
This paper presents the application of the multiframe digital interconnection protection for cogeneration systems. The multiframe digital interconnection protection is constructed from two frequency main frames; one frame to detect islanding events and the other frame to detect faults on either side of the pointof-common-coupling (PCC). Islanding events are detected based on the wavelet packet transform high-frequency subband, which is extracted from the d-q-axis components of the instantaneous 3φ apparent powers determined at PCC. The detection of faults, on either side of PCC, is achieved by extracting the magnitudes and phases of the high-frequency contents present in PCC currents. The high-frequency contents present in PCC currents are extracted by a phaselet filter bank that is composed of six digital high-pass filters, which are designed to implement six phaselet subframes. The multiframe digital interconnection protection is experimentally tested on a 3.6 kVA cogeneration system for islanding events, different faults on both sides of PCC, and nontransient conditions. Test results demonstrate the ability of the proposed interconnection protection to initiate accurate, fast, and reliable responses to various types of transient disturbances.
Research Interests: Power System Protection, Power System Protection Engineering, Active Power Filters, Wavelet Transforms, Transient analysis, and 17 moreCogeneration, Power Filters, Synchronous Generators Analysis, Power System Protection, fault location, distributed generation, Digital Filters, Digital Protective Relays, Anti-islanding, Shunt Active Power Filters, Islanding, Discrete Wavelet Transforms, Islanding Detection, Power System Interconnection, Distributed Generation Power System, Integrated circuit interconnection, power generation protection, interconnection protection, and Cogeneration systems
This paper presents the online implementation and performance evaluation of the phaselet-based method for detecting electric faults in induction motor drives (IMDs). The online implementation of tested fault detection method is achieved... more
This paper presents the online implementation and performance evaluation of the phaselet-based method for detecting electric faults in induction motor drives (IMDs). The online implementation of tested fault detection method is achieved using a digital signal-processing board, where the inputs are the 3φ stator currents and the output is a trip signal. The desired fault feature is extracted using six digital high-pass filters, whose coefficients have been obtained using phaselet basis functions that are generated by the biorthogonal 2.1 scaling function. The performance of the phaselet-based fault detection method is tested for two different IMDs that are fed across-the-line and through a frequency drive system, when operated at different loading levels. Experimental test results show accurate, reliable, and fast fault detection, along with negligible sensitivity to the speed, loading levels, IMD ratings, and fault type.
Research Interests:
This paper presents the analysis and development of a new method for electric fault detection in induction motor drives. The proposed method is based on extracting the magnitudes and phases of the high-frequency subband (HFSB) contents... more
This paper presents the analysis and development of a new method for electric fault detection in induction motor drives. The proposed method is based on extracting the magnitudes and phases of the high-frequency subband (HFSB) contents present in the d - q-axis components of the stator currents (i d and i q ) in an induction motor. The desired magnitudes and phases are extracted by processing id and iq using phaselet frames that are realized by a modulated filter bank. This filter bank is designed using six digital high-pass filters, whose coefficients are determined by biorthogonal phaselet basis functions. Extracted HFSB contents provide signature information that can offer accurate and fast detection of faults. The phaselet-based electric fault detection method has been made into a procedure for digital implementation. The performance of the proposed method is evaluated offline for collected stator currents from two different induction motor drives under different operating conditions. Offline test results show accurate, reliable, and fast detection of electric faults, with minor sensitivity to the ratings, loading levels, and type and location of faults.
Research Interests:
This paper presents the implementation and performance evaluation of a coordinated antiislanding protection for systems with multiple distributed generation units (DGUs). The proposed coordinated antiislanding protection is structured to... more
This paper presents the implementation and performance evaluation of a coordinated antiislanding protection for systems with multiple distributed generation units (DGUs). The proposed coordinated antiislanding protection is structured to process the d - q-axis components of the instantaneous three phase apparent powers (sd and sq) determined at the point-of-common coupling for each DGU. The processing of sd and sq, for each DGU, is carried out by the wavelet packet transform (WPT) in order to extract their low-and high-frequency subband contents. The contents of WPT low-and high-frequency subbands offer signature information that can facilitate detecting the islanding condition and identifying the islanded DGU(s). The coordinated antiislanding protection is implemented in real time for experimental testing on a laboratory collector system that has three different DGUs. Experimental results reveal fast and accurate responses to islanding events, accurate identification of islanded DGUs, and negligible sensitivity to the type or ratings of protected DGUs. In addition, test results show that the d - q WPT-based coordinated antiislanding protection can accurately distinguish between islanding and nonislanding events, including faults, step changes in power delivery to the grid, unintentional loss of grid connection, low-voltage ride through, and sudden harmonic distortion on the grid side.
Research Interests: Data Mining, Power system stability, point of common coupling (PCC), Harmonic distortion, WPT, and 8 moreWavelet Packet Transform, Anti-islanding, Islanding, Islanding Detection, distributed generation units (DGUs), d−q axis components, power distribution protection, and coordinated antiislanding protection
The purpose of this paper is to introduce the status of wave energy conversion (WEC) technologies from a different perspective. Past studies based on WEC systems are summarized and classified in terms of WEC system components to clearly... more
The purpose of this paper is to introduce the status of wave energy conversion (WEC) technologies from a different perspective. Past studies based on WEC systems are summarized and classified in terms of WEC system components to clearly reveal the performance, efficiency and development of WEC technologies over the last two decades. It has been proved that the individual components of a WEC system, such as types of wave energy converter and generator motion, control methods and power electronic converter, have a close relationship with each other and that no single component can be optimized without considering the others. It can be helpful to divide into descriptive parts to provide a better understanding of the development process for WEC technologies so that studies based on WEC technologies are discussed by regarding types of wave energy converters, generators, control methods, controller applied sides, waves, power electronic converters and validations and publication year in this paper.
Research Interests: Renewable Energy, Marine Renewable Energy, Wave Energy, Power System, Integrated Renewable Energy System, and 12 moreRenewable energy resources, Renewable Energy Systems, Control Systems, Wave energy, Wells Turbine, Ocean Wave Energy Converter, Ocean wave energy, Electrical and Control Engineering, Power Electronics Circuits, Wave Energy Converters, Mechanical System Modeling and Control, Wave energy conversion, and Drives and Electrical Controls
This paper presents a coordinated anti-islanding protection for collector systems with multiple distributed generation units (DGUs). The presented anti-islanding protection is established based on processing the d-q-axis components of the... more
This paper presents a coordinated anti-islanding protection for collector systems with multiple distributed generation units (DGUs). The presented anti-islanding protection is established based on processing the d-q-axis components of the instantaneous three phase apparent powers (s d and sq) determined at the point-of-common-coupling using the wavelet packet transform (WPT). Processing s d and sq by using WPT allows the extraction of lowand high-frequency sub-band contents. The contents of the high-frequency sub-band are used to detect and distinguish islanding events, and contents of the lowand high-frequency subbands are employed to define a coordination index, which is used to identify the islanded DGU(s). The presented anti-islanding protection is implemented for off-line testing using data obtained from a laboratory collector with four different DGUs. Off-line test results demonstrate accurate, fast, and reliable responses to islanding and nonislanding event(s), and accurate identification of islanded DGUs along with negligible sensitivity to levels of power delivery to the collector system.
Research Interests: Power System Reliability, Wavelet Transforms, Reliability, Power system stability, Power System Protection, fault location, distributed generation, and 11 moreWavelet Packet Transform, Anti-islanding, Islanding, Distributed Power Generation, Islanding Detection, distributed generation units (DGUs), D-Q-Axis Reference Frame, Islanding Condition, instantaneous three phase apparent powers, Wavelet packets, and power generation protection
The design and implementation of a Virtual Electric Power Transmission Line Lab for undergraduate curricula is introduced in this paper. The aim of the virtual laboratory is to enhance learning and teach students the basis and... more
The design and implementation of a Virtual Electric Power Transmission Line Lab for undergraduate curricula is introduced in this paper. The aim of the virtual laboratory is to enhance learning and teach students the basis and characteristics of the power transmission line model under different conditions in a virtual interface before entering the field. The user can realize various tests, such as short circuit, no-load, load and fault tests, to develop an understanding of the model behaviors, effects of changes in the model parameters, load and connections. The proposed Virtual Electric Power Transmission Line Lab is developed in the Matlab graphical user interface (GUI) environment. The proposed virtual lab has been implemented in the Power Systems Lab taught at the Department of Electrical and Electronics Engineering at Karadeniz Technical University as part of the undergraduate curriculum. A survey of the students who took the lab course has been conducted, and the responses are included in this paper.
Research Interests:
This paper introduces an adaptive fuzzy PI controller (AFPIC) for a flexible AC transmission system (FACTS)-based dynamic power filter (DPF) to be used in wave energy conversion systems. The new FACTS device stabilizes the DC-common bus... more
This paper introduces an adaptive fuzzy PI controller (AFPIC) for a flexible AC transmission system (FACTS)-based dynamic power filter (DPF) to be used in wave energy conversion systems. The new FACTS device stabilizes the DC-common bus voltage, reduces quality of power troubles, and enhances energy utilization by acting as a bus quantity enhancer (BQE). The design and realization of the proposed FACTS-based DPF and efficient control schemes are fully studied. To validate the efficiency of the proposed BQE FACTS device, a digital simulation model and a laboratory test system are developed in the MATLAB/Simulink/Simpower software environment for comparison. Various experimental test models of the proposed BQE system and dynamic error-based controller structures have been utilized to verify the simulation results. It has been shown that the utilization of the proposed AFPIC with the novel BQE device and multivariable error driven control strategy is very effective to eliminate stochastic wave influences on voltage on the load side and load variations on the source side by decreasing voltage sag and swells. The effectiveness of the BQE is also tested by applying error energy-based performance indices ISE, IAE, and ITAE.
Research Interests:
This paper presents the development and performance evaluation of a digital protection for interconnected distributed generation units (DGUs). The developed protection detects and responds to transient disturbances (fault and nonfault... more
This paper presents the development and performance evaluation of a digital protection for interconnected distributed generation units (DGUs). The developed protection detects and responds to transient disturbances (fault and nonfault conditions) based on the magnitudes and phases of the high-frequency sub-band contents, which are extracted from the d-q-axis components of the currents flowing through the point-of-common-coupling (PCC). These magnitudes and phases are extracted by six phaselet frames that are realized by a modulated filter bank that is composed of six digital high-pass filters (HPFs). The coefficients of HPFs are determined by biorthogonal phaselet basis functions. Extracted magnitudes and phases of the high-frequency sub-band contents of PCC d-q-axis current components provide signature information for accurate detection and identification of faults. The performance of phaselet frames-based digital protection is experimentally tested for two wind energy conversion systems (WECSs) and a photovoltaic (PV) system under different fault and nonfault conditions. Test results demonstrate reliable and timely responses, along with negligible sensitivity to the type and control of DGUs, type and location of faults, and loading levels.
Research Interests: Distributed Generation, Mathematical Modelling, Power System Protection, Power System Protection Engineering, Wavelet Transforms, and 14 moreTransient analysis, Mathematical Model, Distributed Generations, Distributed Generations (DG), Distributed Generation (DG), Digital Filters, Distributed generation & energy storage systems, Digital Protective Relays, Digital Protection of Power Systems, Wavelet Functions, IEEE Standard 1547, Circuit faults, Integrated circuit interconnection, and IEEE Standards 1547
Research Interests:
Research Interests:
In this paper, a switched modulated power filter-green plug (SPF-GP) scheme for wave energy conversion (WEC) systems is presented. In order to reduce the interfacing power quality problems and improve the energy utilization of WEC... more
In this paper, a switched modulated power filter-green plug (SPF-GP) scheme for wave energy conversion (WEC) systems is presented. In order to reduce the interfacing power quality problems and improve the energy utilization of WEC systems, design and realization of a novel SPF-GP and effective control strategies are studied. To illustrate the effectiveness of the proposed techniques, a simulation model is developed in Matlab/Simulink/Simpower Software Environment. Besides, experimental prototype models of the proposed SPF-GP system and error driven controllers have been setup to verify the digital simulation model by comparing the results, which validate the effectiveness of the proposed interfacing device and the control algorithms. Both the simulation and the experiments were done for several cases and results of the same operating conditions from both platforms were compared for model validation as well as system performances. It has been shown that the proposed FACTS power filter compensator and control strategy developed by the third author are very effective on eliminating stochastic wave effects on load side voltage and load variations on source side by reducing voltage sags and swells. (C) 2012 Elsevier Ltd. All rights reserved.
Research Interests:
This paper presents the simulation performance of control of a grid-connected photovoltaic maximum power point tracking system with highly efficient and reliable inverter concept transformerless inverter. Perturb and Observe technique... more
This paper presents the simulation performance of control of a grid-connected photovoltaic maximum power point tracking system with highly efficient and reliable inverter concept transformerless inverter. Perturb and Observe technique based on variation of power and voltage is used to extract maximum power from photovoltaic power system. A dc-dc boost converter is applied with the technique by changing duty ratio of the PWM signal of the converter switch. A single-phase highly efficient and reliable inverter concept transformerless inverter provides a power flow into grid. The control of the inverter is based on the grid voltage and current and also dc-dc boost converter output voltage values. The system performance is evaluated in terms of PV module and dc-dc boost converter output voltages and currents, grid current and voltage, leakage current, active and reactive powers and power efficiency characteristics. The simulation results show 97.96% maximum efficiency, 96.84% European efficiency and 97.60% Californian efficiency with 20 kHz switching frequency for the HERIC inverter on the proposed system
Research Interests:
In this paper, different controller techniques based on particle swarm optimization (PSO) algorithm are proposed to control the water level of a steam generator with multiple input-multiple output (MIMO) characteristics. The techniques... more
In this paper, different controller techniques based on particle swarm optimization (PSO) algorithm are proposed to control the water level of a steam generator with multiple input-multiple output (MIMO) characteristics. The techniques employed are classical proportional integral+derivative (PID) control, fuzzy logic control (FLC) and fuzzy tuned proportional-integral control (FTPIC). Gains of PID controller and parameters of FLC (the core and the boundaries of triangular membership functions in input and output spaces) are optimized by the PSO. Validations of the proposed PSO based PID control (PSO-PID), PSO based fuzzy logic control (PSO-FLC) and PSO based fuzzy tuned PI control (PSO-FTPIC) techniques are done with numerical simulation in using MATLAB. The simulation results show that the PSO-PID provides better performance for controlling the water level of a steam generator compared to the others.
Research Interests:
In this paper, a FACTS based dynamic switched C-type filter (DSCTF) compensator scheme for distribution systems is presented with different load characteristics and control strategies. In order to suppress power quality problems and... more
In this paper, a FACTS based dynamic switched C-type filter (DSCTF) compensator scheme for distribution systems is presented with different load characteristics and control strategies. In order to suppress power quality problems and increase overall energy utilization efficiency; design and digital realization of the DSCTF consisting of dynamic control strategies are studied. Matlab/Simulink Software Environment is employed to validate the effectiveness of FACTS DSCTF device. It has been shown that the proposed FACTS-DSCTF is effective to mitigate power quality and energy utilization problems as well as in compensating voltage disturbances and current harmonics.
Research Interests:
This paper introduces a Smart Grid (SG) basics and a pilot project called PowerShift Atlantic (PSA). The benefits of SG, differences between grid types are described and direct load control method, one of the SG strategies, is discussed... more
This paper introduces a Smart Grid (SG) basics and a pilot project called PowerShift Atlantic (PSA). The benefits of SG, differences between grid types are described and direct load control method, one of the SG strategies, is discussed by terms of objectives and principles. The brief information about PSA project including DLC application is presented.
Research Interests:
Bu çalışmada güç koruma rölelerinin teknolojideki ilerlemelere bağlı olarak gelişimi ele alınmaktadır. 1900 yılların başlarından buyana koruma röleleri, farklı özellikler kazanmakta ve sorunların yeni etkili çözümleri olmaktadır.... more
Bu çalışmada güç koruma rölelerinin teknolojideki ilerlemelere bağlı olarak gelişimi ele alınmaktadır. 1900 yılların başlarından buyana koruma röleleri, farklı özellikler kazanmakta ve sorunların yeni etkili çözümleri olmaktadır. Günümüzde dijital röleler, endüstriyel ve ticari tesisler başta olmak üzere birçok elektrik güç sisteminde kullanılmaktadır. Bundan dolayı bu çalışmada “Niçin dijital röle tercih edilmektedir?” sorusunun cevabı, diğer röle türleri ile karşılaştırmalar yaparak ve dijital rölenin ön plana çıkan özellikleri ortaya koyularak aranmaktadır.
Research Interests:
Enerji talebinin gün geçtikçe artığı dünyamızda, yenilenebilir enerji kaynaklarına (rüzgâr, güneş, dalga, biyokütle, vb.) olan ilgi de her yıl büyümektedir. Bu yenilenebilir kaynaklardan verimli bir şekilde faydalanabilmek için, ilgili... more
Enerji talebinin gün geçtikçe artığı dünyamızda, yenilenebilir enerji kaynaklarına (rüzgâr, güneş, dalga, biyokütle, vb.) olan ilgi de her yıl büyümektedir. Bu yenilenebilir kaynaklardan verimli bir şekilde faydalanabilmek için, ilgili enerjini dönüşüm sisteminin (fotovoltaik panel, rüzgâr türbünü, v.b esaslı) uygun yerlere kurulması şarttır. Yararlanılması düşünülen yenilenebilir enerji kaynağı ile yerin uyumluluğu ve maksimum enerji potansiyeli gibi bilgilerin elde edilmesi için gerekli ölçümlerin yapılması ve bu ölçümler matematiksel denklemler ile desteklenerek sonuca vardırılmalıdır. Bu çalışmada, Karadeniz Teknik Üniversitesi (KTÜ) Kanuni yerleşkesinde uygulaması yapılan rüzgâr ve dalga enerji potansiyelini belirlemek amacıyla tasarlanan örnek bir model ölçüm sistemi hakkında bilgi verilecektir.
Research Interests:
Bu çalışmada, iki yardımcı tekere sahip insansız uzaktan kumandalı elektrik bisiklet tasarımı gerçekleştirilmektedir. Kullanıcı, hazırlanmış olan bilgisayar arayüzü yardımı ile insansız bisikletin yön ve hız gibi farklı fonksiyonlarını... more
Bu çalışmada, iki yardımcı tekere sahip insansız uzaktan kumandalı elektrik bisiklet tasarımı gerçekleştirilmektedir. Kullanıcı, hazırlanmış olan bilgisayar arayüzü yardımı ile insansız bisikletin yön ve hız gibi farklı fonksiyonlarını yönetebilmektedir. Kablosuz iletişim teknolojisinden faydalanılarak araç ile kullanıcı kontrol arayüzü arasındaki veri akışı sağlanmaktadır.
Research Interests:
Bu çalışmada, tasarım projesi dersi kapsamında örnek bir Uzaktan Kumandalı İnsansız Su Altı Aracı modeli ele alınmaktadır. İnsansız araçların türleri, uygulama alanları hakkında bilgi verilmekte ve insansız su altı aracı ile ilgili... more
Bu çalışmada, tasarım projesi dersi kapsamında örnek bir Uzaktan Kumandalı İnsansız Su Altı Aracı modeli ele alınmaktadır. İnsansız araçların türleri, uygulama alanları hakkında bilgi verilmekte ve insansız su altı aracı ile ilgili geleceğe yönelik öngörüler paylaşılmaktadır. Tasarım sonrası bitirme projesi dersinde gerçekleştirilecek olan bu aracın tamamlanan tasarım aşamaları yer almaktadır.
Research Interests:
Teknolojideki gelişmelere paralel olarak ev otomasyon sistemlerinin kullanımı giderek yaygınlaşmaktadır. Ev otomasyon sistemleri sadece insanların konfora ve güvenliğe duydukları gereksinimi karşılamakla kalmayıp enerji tasarrufu da... more
Teknolojideki gelişmelere paralel olarak ev otomasyon sistemlerinin kullanımı giderek yaygınlaşmaktadır. Ev otomasyon sistemleri sadece insanların konfora ve güvenliğe duydukları gereksinimi karşılamakla kalmayıp enerji tasarrufu da sağlayarak ekonomik yönden de bir gereklilik olduğunu kanıtlamaktadır. Bu çalışmada, akıllı ev hakkında güncel bilgiler ve bir ev otomasyon örneğinin tasarım aşamaları paylaşılmaktadır.
Research Interests:
Toplumlar, enerji kaynaklarına karşı gösterilmesi gereken saygı noktasında zayıflık göstermektedir. Gün geçtikçe artan haraketlilik, daha çok enerji tüketimine sebep olmaktadır. Otomobiller, yararlı ağırlık ile karşılaştırıldığında daha... more
Toplumlar, enerji kaynaklarına karşı gösterilmesi gereken saygı noktasında zayıflık göstermektedir. Gün geçtikçe artan haraketlilik, daha çok enerji tüketimine sebep olmaktadır. Otomobiller, yararlı ağırlık ile karşılaştırıldığında daha çok faydasız (ölü) yük taşımaktadır. Elektrikli bisikletler, daha az enerji tüketimi sağladıkları için ulaşımda çeşitlilik getirebilir. Elektrikli bisiklette kilometre başına elektrik tüketimi yaklaşık, küçük arabalardan 55 kat, büyük arabalardan 75 kat daha azdır. Elektrikli bisikletler, trafik sıkışıklığı, gürültü ve çevre kirliliğinde önemli oranlarda azalış sağlar. Kullanım amaçlarından bir kaçı, yerel hava kalitesini ve erişilebilirliği artırmak, yaşanabilirliği geliştirmek, gürültü rahatsızlığını azaltmak, sera gazı salınımı düşürmek ve enerji verimliliğini sağlamaktır.
Bu çalışmada, geçmişten günümüze elektrikli araç ve bisiklet hakkında bilgiler verilmektedir.
Bu çalışmada, geçmişten günümüze elektrikli araç ve bisiklet hakkında bilgiler verilmektedir.
Research Interests:
In this paper, a Dynamic FACTS Switched C-type Damped Power Filter (SCTDPF) compensator scheme for distribution systems is presented with different control strategies including fuzzy based approaches. In order to enhance power quality and... more
In this paper, a Dynamic FACTS Switched C-type Damped Power Filter (SCTDPF) compensator scheme for distribution systems is presented with different control strategies including fuzzy based approaches. In order to enhance power quality and improve the energy utilization of a power system; design and digital realization of the novel SCTDPF consisting of dynamic control strategies are studied. A simulation model is developed in Matlab/Simulink/ Simpower Software Environment to validate the effectiveness of FACTS SCTDPF device. Different control strategies have been applied to validate the SCTDPF scheme developed by the Second Author. It has been shown that the proposed FACTS-SCTDPF and novel intelligent dynamic control strategies are effective in enhancing power quality and energy utilization as well as in compensating voltage disturbances and current harmonics.
Research Interests:
Dünya nüfusunun 6 milyarın üzerinde olması, son yıllardaki nüfustaki büyüme oranın %2.2 seviyelerine ulaşması çorbadan içecek olan kişi sayısını geçmiş yıllara göre daha da fazla artırması, küresel ısınma, iklim değişiklikleri, hava... more
Dünya nüfusunun 6 milyarın üzerinde olması, son yıllardaki nüfustaki büyüme oranın %2.2 seviyelerine ulaşması çorbadan içecek olan kişi sayısını geçmiş yıllara göre daha da fazla artırması, küresel ısınma, iklim değişiklikleri, hava kirliliği, su kirliliği ve toprak kirliliği gibi çevresel problemlere sebep olan ve çevre için uzun vadeli en büyük tehlikelerden biri durumuna gelen karbon dioksit (CO2) oranı ve dünyanın ortalama yüzey sıcaklığının 21. Yüzyılın sonuna kadar bir 2-3oC artacağı öngörüsü, yenilenebilir enerji kaynaklarının ulaşım araçlarında da kullanımı önemli bir seçenek haline gelmiştir. Petrol ürünlerinden bağımsız, çevre dostu elektrikli araçlar artık bir çok ülkede günlük ulaşım aracı olmaya başlamıştır. Elektrikli araçlarda kullanılan akülerin Rüzgar, Fotovoltaik ve Hidrojen Yakıt Hücreli yenilenebilir kaynaklardan beslenerek doldurulması ve/veya aracın doğrudan Fotovoltaik/yakıt hücresi gibi kaynaklarla sürülmesi dikkate alınan alternatifler olarak karşımıza çıkmaktadırlar. Bu çalışmada da doğrudan Fotovoltaik panellerden beslenen bir elektrikli aracın kontrol ve simülasyon çalışmaları yapılmaktadır. Geliştirilen modellerin simülasyonları Matlab/Simulink ortamında yapılarak sonuçlar ve ilgili tartışmalar yapılmaktadır.
Research Interests:
Bu çalışmada, Dünya’nın karşı karşıya olduğu önemli enerji ve çevre sorunlarına değinilmekte, soruna çözüm olması gözüyle bakılan yenilenebilir enerji kaynaklarından biri olan dalga enerjisinin maliyeti ve çevresel etkileri üzerinde... more
Bu çalışmada, Dünya’nın karşı karşıya olduğu önemli enerji ve çevre sorunlarına değinilmekte, soruna çözüm olması gözüyle bakılan yenilenebilir enerji kaynaklarından biri olan dalga enerjisinin maliyeti ve çevresel etkileri üzerinde görüşler ele alınmaktadır.
Research Interests:
Bu çalışmada enerjinin tarihinden, günümüze kadar enerji kaynak çeşitlerinin durumu, gelecek için yapılan tahminlerden, yenilenebilir enerji kaynaklarına yapılan yatırımlardan ve niçin yenilenebilir enerjisi sorusunun cevabından ve enerji... more
Bu çalışmada enerjinin tarihinden, günümüze kadar enerji kaynak çeşitlerinin durumu, gelecek için yapılan tahminlerden, yenilenebilir enerji kaynaklarına yapılan yatırımlardan ve niçin yenilenebilir enerjisi sorusunun cevabından ve enerji kaynaklarının kullanımı ile ilgili insanlara düşen görevlerden bahsedilmektedir.
Research Interests:
Bu makalede, yenilenebilir enerji kaynakları hakkında güncel bilgiler verilmiş, yararları, uygulamaları ve ekonomiye katkıları ortaya koyulmuş ve yenilenebilir enerji kaynağı olan dalga enerjisi dönüşüm sisteminin değişik DA yük koşulları... more
Bu makalede, yenilenebilir enerji kaynakları hakkında güncel bilgiler verilmiş, yararları, uygulamaları ve ekonomiye katkıları ortaya koyulmuş ve yenilenebilir enerji kaynağı olan dalga enerjisi dönüşüm sisteminin değişik DA yük koşulları için sistem denetimi benzetim yoluyla gerçekleştirilmiştir.
Research Interests:
Tamda petrol fiyatlarının fırlayıp uçtuğu, küresel ısınmanın doruğa çıktığı bu günlerde yenilenebilir enerji kaynaklarının ulaşım araçlarında da kullanımı önemli bir seçenek haline gelmiştir. Petrol ürünlerinden bağımsız, çevre dostu... more
Tamda petrol fiyatlarının fırlayıp uçtuğu, küresel ısınmanın doruğa çıktığı bu günlerde yenilenebilir enerji kaynaklarının ulaşım araçlarında da kullanımı önemli bir seçenek haline gelmiştir. Petrol ürünlerinden bağımsız, çevre dostu elektrikli araçlar artık bir çok ülkede günlük ulaşım aracı olmaya başlamıştır. Elektrikli araçlarda kullanılan akülerin Rüzgar, Fotovoltaik ve Hidrojen Yakıt Hücreli yenilenebilir kaynaklardan beslenerek doldurulması ve/veya aracın doğrudan Fotovoltaik/yakıt hücresi gibi kaynaklarla sürülmesi dikkate alınan alternatifler olarak karşımıza çıkmaktadırlar. Bu çalışmada da doğrudan Fotovoltaik panellerden beslenen bir elektrikli aracın kontrol ve simülasyon çalışmaları yapılmaktadır. Geliştirilen modellerin simülasyonları Matlab/Simulink ortamında yapılarak sonuçlar ve ilgili tartışmalar yapılmaktadır.
Research Interests:
Petrol fiyatlarının artışını hızla sürdürdüğü, küresel ısınmaya dayalı tarım ve gıda sorunlarının baş gösterdiği günümüzde çevreye duyarlı temiz enerji kaynaklarına yönelik araştırma ve uygulamalar önemini bir kez daha belirgin bir... more
Petrol fiyatlarının artışını hızla sürdürdüğü, küresel ısınmaya dayalı tarım ve gıda sorunlarının baş gösterdiği günümüzde çevreye duyarlı temiz enerji kaynaklarına yönelik araştırma ve uygulamalar önemini bir kez daha belirgin bir biçimde göstermektedir. Rüzgar enerjisi dönüşüm santralleri, Fotovoltaik güneş panelleri, yakıt hücresi uygulamaları, küçük ölçekli hidrolik santrallerin yanı sıra dalga enerjisinin elektriğe dönüştürüldüğü sistemler üzerindeki araştırmalar da hızla devam etmektedir. Bu yazıda, dalga enerjisinin kullanımı ile ilgili olarak yapılan bir literatür çalışmasının sonuçları incelenmekte ve dalga enerjisinin kullanım süreci ve günümüzdeki önemi ele alınmaktadır. Bu inceleme ve değerlendirmeler çerçevesinde de dalga enerjisinin yarın yani gelecek yıllardaki kullanım potansiyeli ve önemi üzerinde durulmaktadır.
Research Interests:
Test ve ölçüm cihazları ve bilgisayarlar arasında iletişimi sağlamakta kullanılan teknolojiler gün geçtikçe gelişmekte, bilgisayar endüstrisi, güçlü yatırımlar ve önemli yeni teknolojilere akın etmektedir. Bu teknolojilerin birçoğu,... more
Test ve ölçüm cihazları ve bilgisayarlar arasında iletişimi sağlamakta kullanılan teknolojiler gün geçtikçe gelişmekte, bilgisayar endüstrisi, güçlü yatırımlar ve önemli yeni teknolojilere akın etmektedir. Bu teknolojilerin birçoğu, performans geliştirmeyi, kullanım kolaylığını artırmayı, özellikleri genişletmeyi, teknik içerikleri geliştirmeyi ve maliyetleri azaltmaktadır. Günümüzde, aynı problemi çözmek için birçok farklı çözüm yöntemleri kullanılabilmektedir. Tasarımcının görevi, en iyi çözümü kendi özel uygulaması için bulmaktır.
Research Interests:
Test ve ölçüm cihazları ve bilgisayarlar arasında iletişimi sağlamakta kullanılan teknolojiler gün geçtikçe gelişmekte, bilgisayar endüstrisi, güçlü yatırımlar ve önemli yeni teknolojilere akın etmektedir. Bu teknolojilerin birçoğu,... more
Test ve ölçüm cihazları ve bilgisayarlar arasında iletişimi sağlamakta kullanılan teknolojiler gün geçtikçe gelişmekte, bilgisayar endüstrisi, güçlü yatırımlar ve önemli yeni teknolojilere akın etmektedir. Bu teknolojilerin birçoğu, performans geliştirmeyi, kullanım kolaylığını artırmayı, özellikleri genişletmeyi, teknik içerikleri geliştirmeyi ve maliyetleri azaltmaktadır. Günümüzde, aynı problemi çözmek için birçok farklı çözüm yöntemleri kullanılabilmektedir. Tasarımcının görevi, en iyi çözümü kendi özel uygulaması için bulmaktır.
Research Interests:
Bu çalışmada yenilenebilir enerji kaynakları genel bir açıdan gözden geçirilmekte, yararları, uygulamaları ve ekonomiye katkıları ortaya koyulmakta ve yenilenebilir enerji kaynağı olan rüzgar enerji üretim sisteminin değişik yük koşulları... more
Bu çalışmada yenilenebilir enerji kaynakları genel bir açıdan gözden geçirilmekte, yararları, uygulamaları ve ekonomiye katkıları ortaya koyulmakta ve yenilenebilir enerji kaynağı olan rüzgar enerji üretim sisteminin değişik yük koşulları altında gerilim ve güç iyileştirilmesi benzetim yoluyla gerçekleştirilmektedir.
Research Interests:
Test ve ölçüm cihazları ve bilgisayarlar arasında iletişimi sağlamakta kullanılan teknolojiler gün geçtikçe gelişmekte, bilgisayar endüstrisi, güçlü yatırımlar ve önemli yeni teknolojilere akın etmektedir. Bu teknolojilerin birçoğu,... more
Test ve ölçüm cihazları ve bilgisayarlar arasında iletişimi sağlamakta kullanılan teknolojiler gün geçtikçe gelişmekte, bilgisayar endüstrisi, güçlü yatırımlar ve önemli yeni teknolojilere akın etmektedir. Bu teknolojilerin birçoğu, performans geliştirmeyi, kullanım kolaylığını artırmayı, özellikleri genişletmeyi, teknik içerikleri geliştirmeyi ve maliyetleri azaltmaktadır. Günümüzde, aynı problemi çözmek için birçok farklı çözüm yöntemleri kullanılabilmektedir. Tasarımcının görevi, en iyi çözümü kendi özel uygulaması için bulmaktır.
Research Interests:
This paper presents the experimental performance assessment of the αβ0-based bus differential protection (BDP). This protection is developed for buses that interconnect battery storage systems (BSSs). The tested BDP employs αβ0 components... more
This paper presents the experimental performance assessment of the αβ0-based bus differential protection (BDP). This protection is developed for buses that interconnect battery storage systems (BSSs). The tested BDP employs αβ0 components of the apparent powers flowing in all branches that are connected to the protected bus. The αβ0 components of apparent powers allow accommodating frequent changes in the direction of power flows due to the charging/discharging modes of the BSS operation. In each branch connected to the protected bus, the 3φ apparent powers are determined using the measured branch currents and voltage (at the protected bus). The αβ0-based BDP is implemented using a digital processing board for experimental testing for a laboratory setup. The test setup is composed of a bus that interconnects a 4 kW BSS, and feeds 3φ linear and dynamic loads. The performance of the αβ0-based BDP is assessed for responding to various internal and external faults occurring during the charging and discharging of the BSS. Experimental results reveal encouraging abilities of the tested BDP to initiate fast, accurate, and reliable responses to internal and external faults. Observed response features are complimented with a minor sensitivity to the BSS mode of operation, fault type, and/or fault location.
Research Interests: Digital Signal Processing, Power System Protection, Power System Protection Engineering, Fault location, Differential Protection, and 4 moreBattery Charging and Discharging, power flow control of PV-wind-Diesel-battery of grid connected and stand-alone hybrid renewable energy systems, Battery Energy Storage Systems (BESS), and Protection and Relaying For Power Systems
This paper investigates factors affecting the contributions of battery units to fault currents in grid-connected battery storage systems (BSSs). The work in this paper is intended to examine effects of the state-of-charge (SOC) on battery... more
This paper investigates factors affecting the contributions of battery units to fault currents in grid-connected battery storage systems (BSSs). The work in this paper is intended to examine effects of the state-of-charge (SOC) on battery currents that are drawn due to faults. This paper also examines impacts of charger controller actions on the currents drawn from battery units to faults in grid-connected BSSs. The impacts of the SOC and charger controller on battery currents due to faults, are examined for the Lead-Acid, Lithium-Ion, and Nickle-Cadmium battery units. Examination results show that the battery currents due to faults are directly dependent on the SOC. Moreover, these results show that actions of charger controller can support the battery terminal voltage, thus preventing the fast reduction of the SOC. The support of the battery terminal voltage helps in limiting the currents drawn from battery units during faults. The effects of the SOC and charger controller are verified using a 1 MW, 3ϕ grid-connected BSS, which has Lead-Acid battery units. Several faults have been created during charging and discharging operations, and at different values of SOC. Test results confirm the direct dependence of battery currents (due to faults) on the SOC. In addition, obtained results demonstrate the ability of charger controller to limit the currents drawn from battery units due to faults in different parts of a grid-connected BSS.
Research Interests:
This paper develops a survivability-based protection for three phase induction motor drive (3ϕ IMDs) systems against severe dynamic events. The developed protection is based on defining a survivability index Γ IMD , which is formulated in... more
This paper develops a survivability-based protection for three phase induction motor drive (3ϕ IMDs) systems against severe dynamic events. The developed protection is based on defining a survivability index Γ IMD , which is formulated in terms of the change in power created by a dynamic event experienced by a 3ϕ IMD. The determination of Γ IMD provides an accurate tool to detect, identify, and respond to unsurvivable dynamic events. The efficacy and validity of the survivability-based protection for 3ϕ IMDs are verified through simulation and experimental tests. These tests are conducted for 10hp 3ϕ IMD under various types of dynamic events. Test results demonstrate the effectiveness of the survivability-based protection in responding to unsurvivable dynamic events to prevent damage to different components in a 3ϕ IMD.
Research Interests:
Bu çalışma sinüsoidal darbe genişlik modülasyon (SDGM) ve üçüncü harmonik eklemeli darbe genişlik modülasyonu (ÜHEDGM) modülasyon tekniklerinin şebekeden bağımsız tek fazlı transformatörsüz H6-II tipi evirici kontrolü için performans... more
Bu çalışma sinüsoidal darbe genişlik modülasyon (SDGM) ve üçüncü harmonik eklemeli darbe genişlik modülasyonu (ÜHEDGM) modülasyon tekniklerinin şebekeden bağımsız tek fazlı transformatörsüz H6-II tipi evirici kontrolü için performans değerlendirmesini sunmaktadır. Sistem temelde DA kaynağı, H6-II tipi evirici, filtre ve yük bileşenlerinden oluşmaktadır. Evirici çıkışı filtre türü olarak yaygın kullanama sahip L, LC ve LCLfiltre yapılarından LCL filtre seçilmiş ve test edilen SDGM ve ÜHEDGM teknikleri, bir adet taşıyıcı işareti ve aralarında faz farkı olan iki adet modülasyon işareti kullanılarak tasarlanmıştır. Çeşitli taşıyıcı işaret türlerinin (sağa ve sola yatık testere ve üçgen) modülasyon teknikleri üzerindeki etkileri ele alınmıştır. Modülasyon tekniklerinin evirici verimi (Normal, Avrupa ve Kaliforniya verimi), aktif evirici giriş ve çıkış güçleri ve toplam harmonik bozulma (THB) miktarını ve akım ve gerilim dalga şekillerini nasıl değiştirdiği gözlemlenmiştir.
Şebeke bağlantısız tek fazlı transformatörsüz H6-II tipi eviricide SDGM tekniğinin kullanımının çıkıştaki yük akımında oluşan THB'nin iyileştirilmesinde pozitif etkisi olduğu ve yük akımı THB değerinin IEEE Std. 1547-2018 standardında belirtilenden daha küçük olduğu ve ayrıca tek fazlı sistemden ÜHEDGM tekniğini uygulanması ile çıkış gerilim dalga şekilde üçüncü harmonik bileşeni yok edemediği ve dalga şeklini sinüsoidal biçimden uzaklaştırdığı, buna rağmen çıkış geriliminin genliğini SDGM tekniği kullan H6-II tipi eviriciye göre daha da büyüttüğü tespit edilmiştir.
Şebeke bağlantısız tek fazlı transformatörsüz H6-II tipi eviricide SDGM tekniğinin kullanımının çıkıştaki yük akımında oluşan THB'nin iyileştirilmesinde pozitif etkisi olduğu ve yük akımı THB değerinin IEEE Std. 1547-2018 standardında belirtilenden daha küçük olduğu ve ayrıca tek fazlı sistemden ÜHEDGM tekniğini uygulanması ile çıkış gerilim dalga şekilde üçüncü harmonik bileşeni yok edemediği ve dalga şeklini sinüsoidal biçimden uzaklaştırdığı, buna rağmen çıkış geriliminin genliğini SDGM tekniği kullan H6-II tipi eviriciye göre daha da büyüttüğü tespit edilmiştir.
Research Interests:
This paper presents the performance evaluation of sinusoidal pulse width modulation (SPWM) and third harmonic injected pulse width modulation (THIPWM) techniques for five level H-bridge diode clamped inverter control. This inverter is... more
This paper presents the performance evaluation of sinusoidal pulse width modulation (SPWM) and third harmonic injected pulse width modulation (THIPWM) techniques for five level H-bridge diode clamped inverter control. This inverter is composed of two 3-level diode clamped half-bridge legs. The tested SPWM and THIPWM techniques is designed by using two phase shifted carrier signals ( ve ) and two modulation signals ( ve ) with phase differences. Effects of various types of carrier signals (right and left sided sawtooth and triangular) on modulation techniques are discussed.
Research Interests:
This paper presents an implementation of the bus-differential protection for buses that interconnect battery storage systems (BSSs). The proposed implementation is based on employing the αß0 components of the apparent powers flowing in... more
This paper presents an implementation of the bus-differential protection for buses that interconnect battery storage systems (BSSs). The proposed implementation is based on employing the αß0 components of the apparent powers flowing in all branches connected to the protected bus. The αß0 components of the apparent powers are employed to accommodate changes in the direction of power flow in branches hosting BSSs. The apparent powers are determined using the measured currents in all branches and the voltage at the protected bus. The proposed implementation of the bus-differential protection is tested for various internal and external faults occurring during the charging and discharging of BSSs. Test results demonstrate the ability of the αß0 apparent power components-based bus differential protection to initiate fast, accurate, and reliable responses to internal and external faults. These response features are found to have minor sensitivity to the mode of operation of the BSS, fault location, and/or fault type.
Research Interests:
This paper presents the development and performance testing of a digital differential protection for solid-state transformers (SSTs). The presented digital differential protection is developed to comply with the Standard ANSI 87T, and has... more
This paper presents the development and performance testing of a digital differential protection for solid-state transformers (SSTs). The presented digital differential protection is developed to comply with the Standard ANSI 87T, and has its differential currents created by dq0 components of the currents flowing in the high and low voltage sides of a SST. Internal faults are detected and identified based on energy contents of the high frequency sub-bands present in the dq0 differential currents. Desired high frequency sub-bands are extracted using the phaselet transform, which can process signals without sensitivity to variations in their frequency and/or phase shifts. Energy contents of extracted high frequency sub-bands allow accurate, fast, and reliable detection and identification of faults in any part of a SST. The developed digital differential protection is implemented for performance testing using a laboratory 25 kVA 3φ SST. Performance results demonstrate accurate, fast, and reliable response to different fault and non-fault events. Responses of the developed differential protection are found to be insensitive to the fault type, fault location, and loading level.
Research Interests:
This paper presents the performance evaluation of the frame-angle-based (FAB) direct torque controller (DTC) for 3φ induction motor drives (IMDs), which are fed by 3φ, 6-pulse wavelet modulated (WM) dc-ac power electronic converters... more
This paper presents the performance evaluation of the frame-angle-based (FAB) direct torque controller (DTC) for 3φ induction motor drives (IMDs), which are fed by 3φ, 6-pulse wavelet modulated (WM) dc-ac power electronic converters (PECs). The tested DTC is designed to adjust the d - q-axis components of the voltages (v ds and v qs ) applied to a 3φ IMD. The adjustments in v ds and v qs are created in response to changes in the load torque, command torque, drive speed, and/or system parameters. Desired adjustments in v ds and v qs are set by regulating the angle ϑ of the frame created by v ds and v qs . This frame produces reference modulating signals that are required to generate wavelet modulated switching pulses for operating the 3φ dc-ac PEC in the IMD. The complete IMD system, incorporating the FAB-DTC, is implemented for a 10-hp IMD system for performance evaluation. Tests of the FAB-DTC for the 10-hp IMD are conducted for various changes in the load torque, command torque, drive speed, and system parameters. Simulation and experimental test results demonstrate fast, accurate, reliable, and dynamic responses with minor sensitivity to variations in system parameters.
Research Interests:
This paper presents a method for selecting locations and sizes of battery storage systems in power systems with distributed power generation. The presented method is based on determining the coherency index $(\mathcal{C})$ for each bus to... more
This paper presents a method for selecting locations and sizes of battery storage systems in power systems with distributed power generation. The presented method is based on determining the coherency index $(\mathcal{C})$ for each bus to quantify its contribution to the frequency of the equivalent center-of-inertia (COI) during and post a transient event. Once $\mathcal{C}$ is determined for each bus, the principle component analysis (PCA) is used to identify buses with consistent low values of $\mathcal{C}$. Such buses are identified as locations for battery storage systems. In addition, the lowest values of $\mathcal{C}$ for buses with low contributions to COI frequency, are used to determine adequate sizes for battery storage systems to be connected at these buses. The performance of the principle component analysis with center-of-inertia (PCA-COI) method is evaluated for Barbados power system under different transient events. Performance results show that battery storage systems (selected using the proposed method) can effectively improve the frequency stability with minor sensitivity to the levels of distributed power generation, loading levels, and/or type or location of transient events.
Research Interests:
This paper presents a new digital differential protection for three phase (3φ) converter transformers. The proposed digital differential protection is developed to comply with the Standard ANSI 87 T, and is designed to detect and identify... more
This paper presents a new digital differential protection for three phase (3φ) converter transformers. The proposed digital differential protection is developed to comply with the Standard ANSI 87 T, and is designed to detect and identify internal faults based on the energy contents of the high frequency subbands present in the d - q-axis components of the differential currents. Desired energy contents are quantified using the phaselet transform (PHT), which can process signals without sensitivity to the variations in their phase shifts. Energy contents of the high frequency sub-bands offer accurate, fast, and reliable detection and identification of internal faults in any part of a 3φ converter transformer. The d - q PHT-based digital differential protection is implemented for performance evaluation using different 3φ converter transformers, when feeding controlled rectifier units. Performance results demonstrate accurate, fast and reliable detection and response to different types of fault and non-fault events. Response features of the developed differential protection are complimented with simple implementation, reduced computations, and minor sensitivity to phase shifts.
Research Interests:
This paper presents the development and testing of a method to control electric water heaters (EWHs) to maximize their energy storage. The developed method is based on a bus-split (BS) aggregated model of EWHs and the unit commitment... more
This paper presents the development and testing of a method to control electric water heaters (EWHs) to maximize their energy storage. The developed method is based on a bus-split (BS) aggregated model of EWHs and the unit commitment (UC). The BS aggregated model provides an accurate ON-OFF status of controlled EWHs, while the UC determines temperature settings for each controlled EWH to achieve maximum energy storage in that EWH. The ON-OFF status of EWHs is verified by the BS aggregate model at each time step to ensure following the temperature set by the UC. The BS-UC controller is implemented for performance evaluation using data collected from 150 households during the fall, winter, spring, and summer seasons. Test results demonstrate that the BS-UC controller can provide accurate, simple, and effective control of EWHs with minor sensitivity to the number aggregated EWHs, hot water consumption, parameters of EWHs, and seasonal variations of household power demands.
Research Interests:
Three phase $(3\phi)$ power transformers can have their windings configured to create local neutral points that can be grounded. The grounding of a $3\phi$ power transformer is designed to limit ground fault currents and maintain low... more
Three phase $(3\phi)$ power transformers can have their windings configured to create local neutral points that can be grounded. The grounding of a $3\phi$ power transformer is designed to limit ground fault currents and maintain low ground potentials. These constraints can be translated into a resistive grounding that is usually designed based on the system ratings and parameters. The resistive grounding, however, can impact the flow of the harmonic components present in the exciting currents. As a result, undesired harmonic components are induced in primary and secondary voltages. This paper presents the design and performance of a frequency-selective grounding that can meet the constraints for grounding a $3\phi$ power transformer. The developed grounding is designed to provide a resistive path for low frequency currents (faults), while providing a low impedance path for high frequency currents (harmonics). The frequency-selective grounding is experimentally tested for a $3\phi$ power transformer with different primary and secondary winding configurations, different fault types, and source grounding. Test results show that the developed grounding can reduce the ground potential, harmonic distortion in primary and secondary voltages, and ground fault currents with a minimum interference with ground fault protective devices.
Research Interests:
Solid-state transformers (SSTs) are an emerging technology that has been developed for modern distribution systems. These new transformers are composed of a medium ac voltage (MV) stage, a dc stage, and a low ac voltage (LV) stage.... more
Solid-state transformers (SSTs) are an emerging technology that has been developed for modern distribution systems. These new transformers are composed of a medium ac voltage (MV) stage, a dc stage, and a low ac voltage (LV) stage. Passive and active dc-links are used in SSTs to support new transformer functionalities, including hybrid (ac and dc) distribution, reactive power compensation, voltage/frequency regulation, power quality improvement, and distributed generation interconnection. However, a SST has to have one of its stages connected to a MV level, which mandates certain converter topologies and/or switching element capabilities. In addition, the dc-link stage has to provide isolation between the MV and LV levels, which requires the employment of isolated dc-dc power electronic converters (PECs). This paper provides a review of SSTs for distribution systems, in terms of the required technology, possible functionalities, performance, and challenges for SSTs and their host distribution systems.
Research Interests:
Research Interests:
Bu çalışma, verimli ve kararlı yapıya sahip tek fazlı şebeke bağlantılı transformatörsüz H5 evirici topolojisine sahip sistemin benzetim performansını sunmaktadır. H5 evirici yapısı şebekeye daha kayıpsız ve güvenli güç akışı... more
Bu çalışma, verimli ve kararlı yapıya sahip tek fazlı şebeke bağlantılı
transformatörsüz H5 evirici topolojisine sahip sistemin benzetim performansını sunmaktadır. H5 evirici yapısı şebekeye daha kayıpsız ve güvenli güç akışı sağlamaktadır. Sistem denetimi, H5 evirici için referans gerilim dalga şeklinin elde edilmesi ve şebekeye aktarılacak akım miktarının belirlenmesi için kullanılan şebeke AA akımı ve DA giriş gerilimi içeren kaskad PI denetleyici yapısı ile gerçekleştirilmektedir. Sistem benzetim çalışması Matlab/Simulink ortamında gerçekleştirilmiş olup sistemin performansı; evirici çıkış gerilimi, şebeke akımı ve gerilimi, aktif ve reaktif güçler ve harmonik bozulma yönünden değerlendirilmektedir.
transformatörsüz H5 evirici topolojisine sahip sistemin benzetim performansını sunmaktadır. H5 evirici yapısı şebekeye daha kayıpsız ve güvenli güç akışı sağlamaktadır. Sistem denetimi, H5 evirici için referans gerilim dalga şeklinin elde edilmesi ve şebekeye aktarılacak akım miktarının belirlenmesi için kullanılan şebeke AA akımı ve DA giriş gerilimi içeren kaskad PI denetleyici yapısı ile gerçekleştirilmektedir. Sistem benzetim çalışması Matlab/Simulink ortamında gerçekleştirilmiş olup sistemin performansı; evirici çıkış gerilimi, şebeke akımı ve gerilimi, aktif ve reaktif güçler ve harmonik bozulma yönünden değerlendirilmektedir.
Research Interests:
Three phase (3φ) power transformers are available in various configurations, which offer the advantage of creating local neutral and grounding points. The different configurations of the primary and secondary sides of 3φ transformers can... more
Three phase (3φ) power transformers are available in various configurations, which offer the advantage of creating local neutral and grounding points. The different configurations of the primary and secondary sides of 3φ transformers can alter the paths, through which harmonic components of exciting currents flow. Such an alteration can cause the induction of undesired harmonic components in the voltages on both sides of a 3φ power transformer. Among these undesired harmonic components is the third harmonic, which can exceed the standardized limits, and can adversely impact the transformer, transmission system, grounding system, protective devices, and/or fed loads. The magnitude of the voltage third harmonic component is highly dependent on the core type, configuration of primary and secondary windings, and ground return paths. This paper experimentally examines the presence of the third harmonic component in primary and secondary side voltages for a 3φ transformer for different primary and secondary winding configurations, separately derived point-of-supply, and isolated and directly connected grounding. The different configurations will be examined to determine what may or may not be considered a separately derived source.
Research Interests:
This paper presents the simulation performance of control of a standalone photovoltaic (PV) maximum power point tracking (MPPT) system with transformerless inverter. The tested control strategy for PV module is based on Perturb and... more
This paper presents the simulation performance of control of a standalone photovoltaic (PV) maximum power point tracking (MPPT) system with transformerless inverter. The tested control strategy for PV module is based on Perturb and Observe (P&O) MPPT algorithm, and current and voltage are employed to enhance controllability of the control scheme applied into a dc-dc boost type power converter. A single-phase HERIC (Highly Efficient and Reliable Inverter Concept) transformerless inverter connected as an output to the converter is applied and controlled to feed ac loads.
Research Interests: Dc-Dc Converters, Power Electronics, Grid Connected Power Converters, grid connected PV inverters, MPPT method for photovoltaic, Inverters, and 24 moreMPPT, Boost Converter, Dc-Dc Boost Converter, Voltage and Reactive Power Control, Photovoltaic Power Systems, Photovoltaic Solar Systems, Grid connected PV system, Power electronic DC-DC converters, Maximum Power Point Tracker, MOSFET inverters, Power Inverters, Maximum Power Point Tracking Techniques of solar panels (MPPT), PV cell/module, Voltage Source Inverters (VSI), Photovoltaic (PV) Systems, Transformerless Inverter, Transformerless Inverters, Maximum Power Point Trackers, Maximum Power Point Tracker (MPPT), Heric, Power harmonic filter, single-phase HERIC transformerless inverter, Single-Phase Transformerless Inverter, and Standalone Photovoltaic
This paper presents a coordinated anti-islanding protection for collector systems with multiple distributed generation units (DGUs). The presented anti-islanding protection is established based on processing the d-q-axis components of the... more
This paper presents a coordinated anti-islanding protection for collector systems with multiple distributed generation units (DGUs). The presented anti-islanding protection is established based on processing the d-q-axis components of the instantaneous three phase apparent powers (sd and sq), determined at the point-of-common-coupling, using the wavelet packet transform (WPT). Processing sd and sq by using WPT allows the extraction of low and high frequency sub-band contents. The contents of the high frequency sub-band are used to detect and distinguish islanding events, and contents of the low and high frequency sub-bands are employed to define a coordination index, which is used to identify the islanded DGU(s). The presented anti-islanding protection is implemented for off-line testing using data obtained from a laboratory collector with four different DGUs. Off-line test results demonstrate accurate, fast, and reliable responses to islanding and non-islanding event(s), accurate identification of islanded DGUs, along with negligible sensitivity to levels of power delivery to the collector system.
Research Interests:
This paper presents the development and performance testing of a new digital protection for interconnected distributed generation units (DGUs). The developed digital protection is structured to detect and respond to transient disturbances... more
This paper presents the development and performance testing of a new digital protection for interconnected distributed generation units (DGUs). The developed digital protection is structured to detect and respond to transient disturbances (fault and non-fault conditions) based on the magnitudes and phases of the high frequency sub-band contents extracted from the d-q axis components of the currents flowing through the point-of-common-coupling (PCC). These magnitudes and phases are extracted by employing a set of 6 phaselet frames. The employed phaselet frames are realized by a modulated filter bank that is composed of 6 digital high pass filters (HPFs). The coefficients of digital HPFs are determined by bi-orthogonal phaselet basis functions. Extracted magnitudes and phases of the high frequency sub-band contents of the PCC d-q axis current components provide signature information for accurate detection and identification of faults. The performance of phaselet frames-based digital protection is experimentally tested for two wind energy conversion systems and a photovoltaic system under different fault and non-fault conditions. Test results of the proposed digital protection demonstrate reliable and timely responses, along with negligible sensitivity to the type and control of DGUs, type and location of faults, and loading levels.
Research Interests: Wavelet, Power System Protection, Power System Protection Engineering, Wavelets, Fault Current, and 13 moreProtection Of Power Systems, Digital Filters, Wind Power Plant, Digital Protective Relays, Digital Protection of Power Systems, Wavelet Function, Wind diesel power plants, Distributed generation units, IEEE Standard 1547, Circuit faults, distributed generation units (DGUs), Distributed generation unit, and digital protection
This paper presents a load frequency control in four area power systems using fuzzy gain scheduling of PI controller is realized. The system simulation is realized by using Matlab/Simulink software. System dynamic performance is observed... more
This paper presents a load frequency control in four area power systems using fuzzy gain scheduling of PI controller is realized. The system simulation is realized by using Matlab/Simulink software. System dynamic performance is observed for conventional PI, fuzzy PI and fuzzy logic controllers.
Research Interests: PID controller design, Pid Controller Using Fuzzy Logic, Pid Controller, Fuzzy Logic Controller, Load Frequency control, and 9 moreFuzzy logic controllers, Hybrid Fuzzy Pid Controller, PI Controller, Fuzzy Logic Controller (FLC), Multi Area Power System, Load Frequency Control of Renewable Energy Sources, Fuzzy PID Controller, Four Area Power System, and Fuzzy Gain Scheduling
This paper proposes a novel control system for control of a photovoltaic (PV)–battery renewable energy system for DC type loads. The performance and dynamic characteristics of the controllers to any load nonlinear J, B parameters and load... more
This paper proposes a novel control system for control of a photovoltaic (PV)–battery renewable energy system for DC type loads. The performance and dynamic characteristics of the controllers to any load nonlinear J, B parameters and load torque is examined for PMDC Motor Drives. The proposed dynamic error driven control system is digitally simulated using the MATLAB/Simulink/SimPower Systems software. The dynamic performance of the system is examined for the proposed controller.
Research Interests:
Bu çalışmada, düzenli dalga durumunda dalga enerjisi dönüşüm sistemi (DEDS) çıkış geriliminde meydana gelen süreksizliğin giderilmesi için tasarlanan anahtarlamalı güç filtresi (AGF), DA-DA terslemeyen azaltan-artıran çevirici (TAAÇ) ve... more
Bu çalışmada, düzenli dalga durumunda dalga enerjisi dönüşüm sistemi (DEDS) çıkış geriliminde meydana gelen süreksizliğin giderilmesi için tasarlanan anahtarlamalı güç filtresi (AGF), DA-DA terslemeyen azaltan-artıran çevirici (TAAÇ) ve denetleyici ele alınmıştır. Sistemin tasarımı ve benzetimsel çalışması Matlab\Simulink programı kullanılarak gerçekleştirilmiştir. AGF ve TAAÇ güç elektroniği devrelerinin denetiminde geleneksel oransal-integral (PI)
denetleyici kullanılmış olup, denetleyici parametre değerlerinin belirlenmesinde parçacık sürü optimizasyonu (PSO) algoritmasından faydalanılmıştır.
denetleyici kullanılmış olup, denetleyici parametre değerlerinin belirlenmesinde parçacık sürü optimizasyonu (PSO) algoritmasından faydalanılmıştır.
Research Interests:
Bu çalışmada, dalga enerji dönüştürücülerinden (DED) elde edilen enerji ile beslenen bir sabit mıknatıslı doğru akım motorunun (SMDAM) hız kontrolü, klasik kontrol yöntemlerinden farklı olarak ağırlık katsayılı oransal-integral... more
Bu çalışmada, dalga enerji dönüştürücülerinden (DED) elde edilen enerji ile beslenen bir sabit mıknatıslı doğru akım motorunun (SMDAM) hız kontrolü, klasik kontrol yöntemlerinden farklı olarak ağırlık katsayılı oransal-integral denetleyici (AKOİK) yardımıyla MATLAB/Simulink ortamında gerçeklenmiştir. Ağırlık katsayılı oransal-integral denetleyicinin parametrelerin ideal değerleri (Kp, Ki, Ke) parçacık sürü optimizasyonu yardımıyla, zaman ağırlıklı mutlak hatanın integralini minimum yapacak şekilde aratılmıştır. Elde edilen sonuçlar yorumlanarak değerlendirilmiştir.
Research Interests:
Research Interests:
This paper proposes a novel control system for control of a hybrid wind/photovoltaic (PV) farm utilization with alternative power source for DC type loads. A controller consisting of six different loop controllers is mainly used to... more
This paper proposes a novel control system for control of a hybrid wind/photovoltaic (PV) farm utilization with alternative power source for DC type loads. A controller consisting of six different loop controllers is mainly used to regulate the DC-DC converter to reduce a weighted total sum of all loop errors, to mainly track a given speed reference trajectory depicting the demand for discharge or flow and also to ensure power quality, reliability and stability. The proposed control function is digitally simulated using the MATLAB/Simulink/ SimPower System software environment. The dynamic performance of the hybrid system is examined for the control system validation under normal and abnormal operating conditions.
Research Interests: Photovoltaics, Wave Energy, Hybrid Systems, Pid Controller Using Fuzzy Logic, Ocean Wave Energy Converter, and 9 moreFuzzy Logic Controller, Fuzzy Logic Controller (FLC), Wave Energy Converters, Wave energy conversion, Wave Energy Converter, Wave Energy Converter/Photovoltaic, multi-loop controller, multi loop control, and error driven control
This paper proposes a novel control system for a green renewable PV-powered standalone village with a hybrid type dc loads consists of variable resistive lighting, heating and motorized loads. A controller consisting of two different... more
This paper proposes a novel control system for a green renewable PV-powered standalone village with a hybrid type dc loads consists of variable resistive lighting, heating and motorized loads. A controller consisting of two different controllers is mainly used to regulate the DC-DC converter, to control power flow from PV-array modules and so to mainly track a given speed reference trajectory depicting the demand for discharge or flow, and also is especially utilized to provide minimum over current, inrush and ripple conditions, to decrease fluctuations and variations in the common DC bus, to make minimum DC bus content in bus voltage and current and also to prolong other power electronics equipments life with absorbing stresses.
The proposed novel control scheme has been validated for both effective and good dynamical speed reference trajectory tracking with enhanced power utilization.
The proposed control function is digitally simulated using the MATLAB/Simulink/SimPower System software environment. The dynamic performance of the system is examined for the control system validation.
The proposed novel control scheme has been validated for both effective and good dynamical speed reference trajectory tracking with enhanced power utilization.
The proposed control function is digitally simulated using the MATLAB/Simulink/SimPower System software environment. The dynamic performance of the system is examined for the control system validation.
Research Interests:
In this study, a battery powered four-wheel drive electric vehicle with fuzzy logic sliding mode controller (FLSMC) is realized. The conventional sliding surface is modified using fuzzy rules sets. The dynamic sliding surfaces are... more
In this study, a battery powered four-wheel drive electric vehicle with fuzzy logic sliding mode controller (FLSMC) is realized. The conventional sliding surface is modified using fuzzy rules sets. The dynamic sliding surfaces are obtained by changing their sloped using the global error and its derivative in fuzzy logic inference system. The characteristics of the designed controller to
nonlinear J, B and load torque for EV Electric Drives System are observed. The proposed system control mechanism is digitally simulated by using the MATLAB/Simulink/SimPowerSystems software. Simulation results show that the system with FLSMC has good efficiency and performance.
nonlinear J, B and load torque for EV Electric Drives System are observed. The proposed system control mechanism is digitally simulated by using the MATLAB/Simulink/SimPowerSystems software. Simulation results show that the system with FLSMC has good efficiency and performance.
Research Interests: Fuzzy Logic, Fuzzy Logic Control, Electric Vehicles, Sliding mode control, Adaptive Fuzzy Sliding mode control, and 8 moreFuzzy Logic and Its Application, Fuzzy Logic Controller, Sliding-Mode Control, Sliding Mode, Sliding Mode Controller, Battery Powered, Four-Wheel Drive, and Fuzzy Logic Sliding Mode Controller
This paper proposes a novel control system for control of a hybrid wind/photovoltaic (PV) farm utilization with alternative power source for DC type loads. A controller consisting of six different loop controllers is mainly used to... more
This paper proposes a novel control system for control of a hybrid wind/photovoltaic (PV) farm utilization with alternative power source for DC type loads. A controller consisting of six different loop controllers is mainly used to regulate the DC-DC converter to reduce a weighted total sum of all loop errors, to mainly track a given speed reference trajectory depicting the demand for discharge or flow and also to ensure power quality, reliability and stability. The proposed control function is digitally simulated using the MATLAB/Simulink/ SimPower System software environment. The dynamic performance of the hybrid system is examined for the control system validation under normal and abnormal operating conditions.
Research Interests:
Research Interests:
Bu çalışmada, sınırlı akım döngülü çift çevrim destekli PID denetleyici ile sürekli mıknatıslı doğru akım (SMDA) motor kontrolü gerçekleştirilmiştir. Doğru akım (DA) motor modeli MATLAB/Simulink kullanılarak ortaya koyulmuştur. Önerilen... more
Bu çalışmada, sınırlı akım döngülü çift çevrim destekli PID denetleyici ile sürekli mıknatıslı doğru akım (SMDA) motor kontrolü gerçekleştirilmiştir. Doğru akım (DA) motor modeli MATLAB/Simulink kullanılarak ortaya koyulmuştur. Önerilen sistem denetim mekanizmasının benzetimi MATLAB/ Simulink/SimPowerSystems yazılımı kullanılarak gerçekleştirilmiştir. Sistemin dinamik performansı, sabit hız referansı ve değişken hız referans yolu için gözlemlenmiştir.
Research Interests:
Bu çalışmada, asenkron motor için uyarlamalı akı gözlemleyici tabanlı hız algılayıcısız doğrudan moment kontrolü gerçekleştirilmiştir. Asenkron motor durağan referans düzleminde ortaya koyulmuş, sabit hız ve değişken hız referans... more
Bu çalışmada, asenkron motor için uyarlamalı akı gözlemleyici tabanlı hız algılayıcısız doğrudan moment kontrolü gerçekleştirilmiştir. Asenkron motor durağan referans düzleminde ortaya koyulmuş, sabit hız ve değişken hız referans değerleri için sistem davranışı gözlemlenmiştir.
Research Interests:
The control of active and reactive power are most important in order to keep the system in the steady-state in power system . Therefore, there is a requirement to keep voltage and frequency constant under all circumstances. Voltage and... more
The control of active and reactive power are most important in order to keep the system in the steady-state in power system . Therefore, there is a requirement to keep voltage and frequency constant under all circumstances. Voltage and frequency control must be performed to obtain the effective operating condition of the system. This paper is to present load freguency control with fuzzy logic based control technique on a power system model and review effect of the various shapes of membership functions on system control. Last time appropriateness of triangular, gaussian, trapezoid and cauchy membership functions in the load frequency control are compared.
Research Interests:
This paper proposes a novel control system for control of a hybrid wind/photovoltaic (PV) farm utilization with alternative power source for DC type loads. A controller consisting of six different loop controllers is mainly used to... more
This paper proposes a novel control system for control of a hybrid wind/photovoltaic (PV) farm utilization with alternative power source for DC type loads. A controller consisting of six different loop controllers is mainly used to regulate the DC-DC converter to reduce a weighted total sum of all loop errors, to mainly track a given speed reference trajectory depicting the
Research Interests:
This paper proposes a novel control system for control of a hybrid photovoltaic PV farm utilization with alternative power source for DC type loads. A controller consisting of two different controllers is mainly used to regulate the DC-DC... more
This paper proposes a novel control system for control of a hybrid photovoltaic PV farm utilization with alternative power source for DC type loads. A controller consisting of two different controllers is mainly used to regulate the DC-DC converter and also to control power flow from alternative power source to reduce a weighted total sum of all loop errors, to mainly track a given speed reference trajectory depicting the demand for discharge or flow and also to ensure power quality, reliability and stability. The proposed control function is digitally simulated using the MATLAB/Simulink/SimPower System software environment. The dynamic performance of the hybrid system is examined for the control system validation under normal and abnormal operating conditions.
Research Interests:
Research Interests:
A novel sinusoidal PWM Switched Power Filter (SPF) and Dynamic Voltage Compensation (DVC) scheme is studied in this work. A real time dynamic voltage, power and generator velocity error tracking based fuzzy logic controller (FLC) is used... more
A novel sinusoidal PWM Switched Power Filter (SPF) and Dynamic Voltage Compensation (DVC) scheme is studied in this work. A real time dynamic voltage, power and generator velocity error tracking based fuzzy logic controller (FLC) is used to stabilize the stand alone Wind Energy Conversion Scheme (WECS) comprising an induction generator. The novel dynamic error driven FLC controlled scheme serves as a voltage stabilization regulator and energy utilization enhancement compensator.
Research Interests:
In this study, a novel sinusoidal PWM switched AC/DC/AC converter interface scheme using real novel triloop voltage error tracking fuzzy logic controller (FLC), to stabilize the stand alone Wind Energy Conversion Scheme (WECS) using an... more
In this study, a novel sinusoidal PWM switched AC/DC/AC converter interface scheme using real novel triloop voltage error tracking fuzzy logic controller (FLC), to stabilize the stand alone Wind Energy Conversion Scheme (WECS) using an induction generator. The proposed novel sinusoidal Pulse Width Modulator (SPWM) switched (AC/DC/AC) converter (diode rectifier and 6-pulse IGBT inverter) interface scheme serves as a combined voltage stabilization regulator and maximum wind energy utilization and enhancement compensator.
Research Interests: Wind Energy, Fuzzy Logic, Fuzzy Logic Control, Error Correction Coding, Induction Generators, and 18 moreWind Energy (Engineering), Fuzzy Control, Wind Power, PWM inverter, Wind Power Conversion, Fuzzy Logic and Its Application, Voltage regulator, Soft Switching Converter, Fuzzy Logic Controller, Voltage and Reactive Power Control, Pulse Width Modulation, Pulse Width Modulation (PWM), Power Conservation And Utilisation, Pulse width modulation converters, Pulse width modulation inverter, PWM power converter, Wind Energy Conversion Scheme, and AC/DC/AC Interface
In this study, a direct wheel drive electric vehicle based on electronic differential system with fuzzy logic controller is realized. DC motor and fuzzy logic controller model are obtained in the Simulink. The proposed electrical vehicle... more
In this study, a direct wheel drive electric vehicle based on electronic differential system with fuzzy logic controller is realized. DC motor and fuzzy logic controller model are obtained in the Simulink. The proposed electrical vehicle electronic differential system and control mechanism are digitally simulated by using the MATLAB/Simulink/SimPower Systems software.
Research Interests:
The paper presents a digital simulation and validation study of an error driven tri-loop Fuzzy Logic Controller FLC with motor load current limiting loop for a hybrid photovoltaic PV farm utilization with an alternative power source for... more
The paper presents a digital simulation and validation study of an error driven tri-loop Fuzzy Logic Controller FLC with motor load current limiting loop for a hybrid photovoltaic PV farm utilization with an alternative power source for DC type loads. A three loop dynamic error driven fuzzy logic controller is designed and validated for the control of the required power transfer to the composite DC-load under normal as well as abnormal disturbance based excursions and changes. The basic characteristic of the FLC controller is the catering to any nonlinear Load Inertia and Damping J, B as well as sudden load torque excursions and surges. The proposed control function is digitally simulated using the MATLAB/Simulink/SimPower System software environment. The dynamic performance of the unified green energy PV-DC utilization system is fully examined for the control system validation under normal and abnormal operating conditions.
Research Interests:
Research Interests:
In this study, direct torque control (DTC) of induction motor is evaluated based on space vector modulation (SVM). DTC is a method to control machine with utilizing torque and flux of motor controlled. The torque and current ripple are... more
In this study, direct torque control (DTC) of induction motor is evaluated based on space vector modulation (SVM). DTC is a method to control machine with utilizing torque and flux of motor controlled. The torque and current ripple are occurred in the conventional DTC. Reason of undesired torque and current ripple is low number of voltage vectors applied to the motor controlled by the conventional DTC technique. SVM-DTC is a technique to reduce the ripple. SVM techniques have several advantages that are offering better DC bus utilization, lower torque ripple, lower total harmonic distortion in the AC motor current, lower switching loss, and easier to implement in the digital systems. Simulation results from the classical and improved DTC are presented and compared. Result shows that the torque, flux linkage and stator current ripple are decreased with the improved DTC.
Research Interests: Engineering, Signal Processing, Power System, Switching, Power Transmission, and 12 moreEquivalent Circuit, Voltage regulator, Induction machine, Pulse Width Modulation, Inverter, Space vector modulation, Electricity Generation, Experimental Data, Reference Value, Direct Torque Control, Predictive Control, and Torque Control
This paper presents fuzzy logic control for a Single-sided Linear Induction Motor (SLIM). In the last years, in the field of research on linear induction drives, a lot of efforts have been oriented to improve the dynamics performances of... more
This paper presents fuzzy logic control for a Single-sided Linear Induction Motor (SLIM). In the last years, in the field of research on linear induction drives, a lot of efforts have been oriented to improve the dynamics performances of these machines by using fuzzy logic control (FLC). In order to insure a high transient behavior of the drive and to avoid the drawback of the parametric perturbations in the implemented control, the FLC is considered in this work.
Research Interests:
In this study, a hybrid photovoltaic PV array-battery powered PMDC drive scheme is realized. The PID tri loop limited current loop controller with motor current of four-wheel drive electric vehicle is used. Photovoltaic array and DC motor... more
In this study, a hybrid photovoltaic PV array-battery powered PMDC drive scheme is realized. The PID tri loop limited current loop controller with motor current of four-wheel drive electric vehicle is used. Photovoltaic array and DC motor model are obtained in the Simulink. The proposed system control mechanism is digitally simulated by using the MATLAB/ Simulink/Sim-Power Systems software. The dynamic performance of the system is brought into at the constant speed reference and the variable speed reference trajectory.
Research Interests:
This paper presents a direct torque control for a Single-sided Linear Induction Motor (SLIM). In the last years, in the field of research on linear induction drives, a lot of efforts have been oriented to improve the dynamics performances... more
This paper presents a direct torque control for a Single-sided Linear Induction Motor (SLIM). In the last years, in the field of research on linear induction drives, a lot of efforts have been oriented to improve the dynamics performances of these machines by using direct torque control. In order to insure a high transient behavior of the drive and to avoid the draw back of the parametric perturbations in the implemented control, the direct torque control is considered in this work.
Research Interests:
Pasif süspansiyon sistemlerinin sürüş konforu, iyi tutuş veya iyi yol tutuşu gibi özellikleri yeteri kadar sağlayamaması, aktif süspansiyon sistemlerinin gün geçtikçe araçlarda kullanımının artmasını ve bu süspansiyon sistemlerinin... more
Pasif süspansiyon sistemlerinin sürüş konforu, iyi tutuş veya iyi yol tutuşu gibi özellikleri yeteri kadar sağlayamaması, aktif süspansiyon sistemlerinin gün geçtikçe araçlarda kullanımının artmasını ve bu süspansiyon sistemlerinin kontrolünün önem kazanmasını sağlamıştır. Bu çalışmada 1/4 aktif süspansiyon sistemi MATLAB/SIMULINK programı kullanılarak modellenmiş, bu sistemin denetimi için bulanık mantık denetleyici tasarlanmış, oluşturulan denetleyici ile süspansiyon sistemi birleştirilmiş ve SIMULINK ortamında bulanık mantık denetleyici ile denetim gerçekleştirilmiştir.
Research Interests:
This paper proposes a novel control system for control of a hybrid photovoltaic PV farm utilization with alternative power source for DC type loads. A controller consisting of three different controllers is mainly used to regulate the... more
This paper proposes a novel control system for control of a hybrid photovoltaic PV farm utilization with alternative power source for DC type loads. A controller consisting of three different controllers is mainly used to regulate the DC-DC converter and also to control power flow from alternative power source to reduce a weighted total sum of all loop errors, to mainly track a given speed reference trajectory depicting the demand for discharge or flow and also to ensure power quality, reliability and stability. The proposed control function is digitally simulated using the MATLAB/Simulink/ SimPowerSystem software environment. The dynamic performance of the hybrid system is examined for the control system validation.