- University Kebangsaan Malaysia
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... configuration. The accuracy of the ANN results indicates that the ANN model can be a useful tool for solving online realtime network reconfiguration problems so that the loss reduction of the distribution system is achieved. The ...
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Network reconfiguration is an operation task, and consists in the determination of the switching operations such to reach the minimum loss conditions of the distribution networks. In this paper, a general formulation of the network... more
Network reconfiguration is an operation task, and consists in the determination of the switching operations such to reach the minimum loss conditions of the distribution networks. In this paper, a general formulation of the network reconfiguration for loss minimization is given for the optimization of distribution loss reduction and a solution approach is presented. The solution employs a search over
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Research Interests: Comparative Study, Electric Power Systems, Optimal Power Flow, Interpolation, Power Market, and 10 moreTransmission Line, Electric Power, Curve fitting, Indexation, Transient Stability, Load Flow, Power flow, Electrical And Electronic Engineering, Available transfer capability, and Cubic Spline Interpolation
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The determination of ATC must accommodate a reasonable range of capacity benefit margin (CBM) so that the operation of power system is secure from the generation deficiency that may occur during a power transfer. There are two ways of... more
The determination of ATC must accommodate a reasonable range of capacity benefit margin (CBM) so that the operation of power system is secure from the generation deficiency that may occur during a power transfer. There are two ways of incorporating CBM into ATC, which are by considering the CBM as firm and non-firm transfers. The CBM for each area is specified based on the installed generation capacity that gives the loss-of-load expectation index below 2.4 h/year. The determination of CBM based on heuristic search for a large ...
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Load shedding is some of the essential requirement for maintaining security of modern power systems, particularly in competitive energy markets. This paper proposes an intelligent scheme for fast and accurate load shedding using neural... more
Load shedding is some of the essential requirement for maintaining security of modern power systems, particularly in competitive energy markets. This paper proposes an intelligent scheme for fast and accurate load shedding using neural networks for predicting the possible loss of load at the early stage and neuro-fuzzy for determining the amount of load shed in order to avoid a cascading outage. A large scale electrical power system has been considered to validate the performance of the proposed technique in determining the amount of load shed. The proposed techniques can provide tools for improving the reliability and continuity of power supply. This was confirmed by the results obtained in this research of which sample results are given in this paper.
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Research Interests: General Relativity, Power System, Neural Network, Multidisciplinary, Feature Selection, and 12 moreData Collection, Applied Sciences, Feature Extraction, Multi-layer Perceptron, Electric Power System, Principle component analysis, Probabilistic Neural Network, Extraction Method, Transient Stability, Time Domain, Security Assessment, and Electrical And Electronic Engineering
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Abstract This paper proposes a new method to locate the source of harmonic either from the utility or the customer from measurement made at the point of common coupling (PCC). The proposed method is called"... more
Abstract This paper proposes a new method to locate the source of harmonic either from the utility or the customer from measurement made at the point of common coupling (PCC). The proposed method is called" voltage magnitude comparison method" because it compares the measured harmonic voltage at the PCC and the calculated voltage either at the utility side or at the customer side in the Thevenin equivalent circuit. The calculated voltage magnitude which is greater than the measured voltage at the PCC is considered as the ...
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Abstract--This paper presents transient stability assessment of electrical power system using least squares support vector machine (LS-SVM) and principle component analysis. Transient stability of a power system is first determined based... more
Abstract--This paper presents transient stability assessment of electrical power system using least squares support vector machine (LS-SVM) and principle component analysis. Transient stability of a power system is first determined based on the generator relative rotor angles ...
Research Interests: General Relativity, Principal Component Analysis, Power System, Support Vector Machines, Neural Network, and 10 moreDevelopment, Data Collection, Simulation Methods, Multi-layer Perceptron, Electric Power System, Principle component analysis, Transient Stability, Time Domain, Security Assessment, and Artificial Neural Network
One of the growing needs in transmission planning is to provide accurate sim-ulation models of the generator, excitation system, and governor; however, the degree of accuracy of the generator model is often questioned because model... more
One of the growing needs in transmission planning is to provide accurate sim-ulation models of the generator, excitation system, and governor; however, the degree of accuracy of the generator model is often questioned because model pa-rameters currently used may have ...
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Abstract-Dynamic voltage restorer (DVR) is a custom power device used for mitigating voltage sags in power distribution systems. This paper presents a simulation model of a 12-pulse DVR using photovoltaic as a means of providing an... more
Abstract-Dynamic voltage restorer (DVR) is a custom power device used for mitigating voltage sags in power distribution systems. This paper presents a simulation model of a 12-pulse DVR using photovoltaic as a means of providing an alternative energy source for the DVR. For ...
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Research Interests: Power Systems, Assessment, Power System, Radial Basis Function, Vulnerability, and 15 moreMultidisciplinary, Power, Power Generation, System, Reactive Power, American, Feature Extraction, Vulnerability assessment, Voltage, Transmission lines, Transmission Line, Indexation, Load Flow, Power flow, and Power System Simulation
This paper presents a new method for identifying harmonic sources originating from various single phase nonlinear loads such as the uninterruptible power supply, personal computer, fluorescent lamp with electronic ballast and personal... more
This paper presents a new method for identifying harmonic sources originating from various single phase nonlinear loads such as the uninterruptible power supply, personal computer, fluorescent lamp with electronic ballast and personal computer. Signal processing techniques based ...
Research Interests: Harmonic Analysis, Expert Systems, Signal Processing, Power Quality, User Interface, and 14 moreFractals, Identification, Intelligent System, expert System, Feature Extraction, Microcomputers, Harmonic distortion, Fast Fourier Transform, Uninterruptible power supply, Rule Based, Total Harmonic Distortion, Fast Fourier Transforms, Electronic Ballast, and Form Factor
Abstract The accuracy of synchronous machine parameters is one of the crucial factors in correctly simulating power system dynamic events. This paper describes a technique for deriving synchronous machine parameters in which the... more
Abstract The accuracy of synchronous machine parameters is one of the crucial factors in correctly simulating power system dynamic events. This paper describes a technique for deriving synchronous machine parameters in which the implementation of the technique is automated in Matlab. A procedure for estimating the synchronous machine parameters is also proposed in which the method uses a gradient-based simulation to estimate the parameters. An example of the proposed method is then demonstrated to show the ...
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Abstract High penetration of Distributed Generation (DG) units will have unfavorable impacts on the traditional fault location methods because the distribution system is no longer radial in nature and is not supplied by a single main... more
Abstract High penetration of Distributed Generation (DG) units will have unfavorable impacts on the traditional fault location methods because the distribution system is no longer radial in nature and is not supplied by a single main power source. This study presents an automated fault location method using Radial Basis Function Neural Network (RBFNN) for a distribution system with DG units. In the proposed method, the fault type is determined first by normalizing the fault currents of the main source. Then to determine the fault location, ...
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Secure operation of modern electric power system is important despite of oc-currence of various disturbances in the system. Assessing the security status is a computationally demanding task, and there is a need for a fast on-line security... more
Secure operation of modern electric power system is important despite of oc-currence of various disturbances in the system. Assessing the security status is a computationally demanding task, and there is a need for a fast on-line security assessment tool. To achieve this, an ...
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A NEW TECHNIQUE TO PREDICT THE SOURCES OF VOLTAGE SAGS USING SUPPORT VECTOR REGRESSION BASED S-TRANSFORM Mohamed Fuad Faisal, Azah Mohamed Universiti Kebangsaan Malaysia Bangi, Selangor, Malaysia mfuadfa@tnb.com.my, azah@eng ...
Abstract This paper presents a new method for locating the source of capacitor switching transients using the complex wavelet-based energy approach. By using the complex wavelet transform, the transient power at the monitoring point is... more
Abstract This paper presents a new method for locating the source of capacitor switching transients using the complex wavelet-based energy approach. By using the complex wavelet transform, the transient power at the monitoring point is first calculated and the complex wavelet energy is obtained by integrating the transient power. From the wavelet energy plot against time, a change in wavelet energy from an approximately zero to a negative value indicates that the transient source is in front of the monitoring point. On the ...
This paper presents a new approach to prevent undesirable distance relay tripping by using the rate of change of voltage, dv/dt and voltage stability index (VSI). By using the dv/dt, the distance relay is able to block the false trip... more
This paper presents a new approach to prevent undesirable distance relay tripping by using the rate of change of voltage, dv/dt and voltage stability index (VSI). By using the dv/dt, the distance relay is able to block the false trip signals due to voltage instability. However, the dv/dt approach is inappropriate to identify between a fault and close to collapse
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Research Interests: Power System, Neural Network, Development, Mathematical Sciences, Dynamic Simulation, and 12 moreSupport Vector Regression, Data Collection, Support vector machine, Multi-layer Perceptron, Operant Conditioning, Indexation, Time Domain, Artificial Neural Network, Voltage Collapse, Power Energy, Kernel Function, and Power System Simulation
Abstract Vulnerability assessment of a power system has been of great concern due to the continual blackouts in recent years which indicate that a power system today is too vulnerable to withstand an unforeseen catastrophic contingency.... more
Abstract Vulnerability assessment of a power system has been of great concern due to the continual blackouts in recent years which indicate that a power system today is too vulnerable to withstand an unforeseen catastrophic contingency. This paper presents a new approach to assess vulnerability of a power system based on radial basis function neural network. A new feature extraction method named as the neural network weight extraction is also proposed to reduce the number of input features to the neural network. The ...
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... Kebangsaan Malaysia Mohammad Khajehzadeh, Universiti Kebangsaan Malaysia. Suggested Citation. Mahdiyeh Eslami, Hussain Shareef, Azah Mohamed, and Mohammad Khajehzadeh. "Damping of Power System... more
... Kebangsaan Malaysia Mohammad Khajehzadeh, Universiti Kebangsaan Malaysia. Suggested Citation. Mahdiyeh Eslami, Hussain Shareef, Azah Mohamed, and Mohammad Khajehzadeh. "Damping of Power System Oscillations Using ...
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Abstract This paper presents dynamic voltage collapse prediction on an actual power system using support vector machines. Dynamic voltage collapse prediction is first determined based on the PTSI calculated from information in dynamic... more
Abstract This paper presents dynamic voltage collapse prediction on an actual power system using support vector machines. Dynamic voltage collapse prediction is first determined based on the PTSI calculated from information in dynamic simulation output. Simulations were carried out on a practical 87 bus test system by considering load increase as the contingency. The data collected from the time domain simulation is then used as input to the SVM in which support vector regression is used as a predictor to determine the ...
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... Permissions & Reprints. Rule based system for power quality disturbance classification incorporating S-transform features. Mohammad E. Salem a , Azah Mohamed Corresponding Author Contact Information , a ,... more
... Permissions & Reprints. Rule based system for power quality disturbance classification incorporating S-transform features. Mohammad E. Salem a , Azah Mohamed Corresponding Author Contact Information , a , E-mail The Corresponding Author and Salina Abdul Samad a. ...
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Research Interests: Electrical Engineering, Control Systems Engineering, Image Processing, Power Quality, Control Systems, and 12 moreTime-Frequency Analysis, Graphic User Interface Design, Voltage sag, Time Frequency Analysis, Real Time, Matlab Gui, Electric Utilities, Digital Signal Processor, Data Processing, Fast Fourier Transform, System performance, and Data Capture
Abstract This paper proposed a new method to locate the source of voltage sag from the measurements taken at the point of common coupling (PCC) which is the point of connection between utility and customer in a power distribution system.... more
Abstract This paper proposed a new method to locate the source of voltage sag from the measurements taken at the point of common coupling (PCC) which is the point of connection between utility and customer in a power distribution system. The proposed method uses the RMS current and power factor angle, which are the measured parameters at the PCC. The product of the RMS current and the power factor angle at the PCC is then used to locate the source of voltage sag. A graph of this product against time is plotted and by examining the ...
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... power, but in this study it is assumed they are used to generate only electrical power. ... Result fromoptimization simulation for reactive power setpoints of four DGs is depicted figs. ... The simulation results indicate that... more
... power, but in this study it is assumed they are used to generate only electrical power. ... Result fromoptimization simulation for reactive power setpoints of four DGs is depicted figs. ... The simulation results indicate that distribution network power losses and at the same time keeping ...
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Abstract. This paper presents the Intelligent Power Quality Disturbance Analysis (IPQDA) software tool that is designed for an automatic analysis of power quality (PQ) disturbance. The main capabilities of the software include analysis of... more
Abstract. This paper presents the Intelligent Power Quality Disturbance Analysis (IPQDA) software tool that is designed for an automatic analysis of power quality (PQ) disturbance. The main capabilities of the software include analysis of disturbance waveforms, identification of a particular type of disturbance and notification of a disturbance. Another important feature of the program is that it can automatically send email or short messaging notifications upon identification of a disturbance to alert the system operator of a ...
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Abstract—Airbag deployment has been known to be responsible for huge death, incidental injuries and broken bones due to low crash severity and wrong deployment decisions. Therefore, the authorities and industries have been looking for... more
Abstract—Airbag deployment has been known to be responsible for huge death, incidental injuries and broken bones due to low crash severity and wrong deployment decisions. Therefore, the authorities and industries have been looking for more innovative and intelligent products to be realized for future enhancements in the vehicle safety systems (VSSs). Although the VSSs technologies have advanced considerably, they still face challenges such as how to avoid unnecessary and untimely airbag deployments that can ...