2022 International Conference on Power Energy Systems and Applications (ICoPESA)
The master-slave control is an important scheme to control the microgrid in both islanded and gri... more The master-slave control is an important scheme to control the microgrid in both islanded and grid-connected modes. It has been proved that it is competitive to the droop control schemes. This presented paper shows two techniques to control the current/power of the slave inverters to precisely adjust the injected output power of the slave inverters. The adopted microgrid contains two multilevel (five-level diode-clamped) inverters. One inverter is operated as a slave inverter and the remaining inverter is operated as a master inverter. The slave inverter can be operated using two techniques. The slave inverter is operated in a direct current control (DCC) mode using nested multiband hysteresis current control. While the second technique is the indirect current control (ICC) mode through the cascaded structure of power and current loops. Simulation results show a comparative analysis, which affirms that the DCC gives much better performance for current/power control, while the ICC gives a slightly better performance for voltage stabilization at loads.
International Journal of Smart Grid and Clean Energy, 2020
This paper presents an accurate tool for tracking the voltage unbalance in the microgrid. This ac... more This paper presents an accurate tool for tracking the voltage unbalance in the microgrid. This accurate tracking depends on a new formulation of the adaptive linear neuron (ADALINE). This formulation has accurate estimation/extraction of positive-, negative-, and zero-sequence voltages. The paper introduces a control scheme that stabilizes the voltages at the loads side by adjusting the positive voltage around 1 pu and mitigating the negativesequence voltage. This voltage stabilization is done through the developed control scheme, which has a cascadedloop structure for voltage and current control. The control scheme along with the suggested estimation tool gives accurate results for stabilizing the voltage at the loads side for different loading conditions.
2022 Advances in Science and Engineering Technology International Conferences (ASET), 2022
The master-slave control/operational scheme proves to be very efficient for operating any microgr... more The master-slave control/operational scheme proves to be very efficient for operating any microgrid in different modes: Islanded and grid-connected modes. The master-slave schemes prove to be competitive compared to the droop control schemes because of their admirable characteristics for the control/operation of AC microgrids. This presented paper employs the master-slave scheme as a control scheme for the operation of the microgrid. The adopted microgrid contains three multilevel (five-level diode-clamped) inverters. Two of them are operated as slave units, and the remaining unit is employed as a master unit. The slave units are operated in a current-controlled mode using developed multiband hysteresis current control. At the same time, the master inverter is operated in a voltage-controlled mode, which is responsible for maintaining both frequency and voltage at a certain level. In addition, the redundancy of the slave units is checked in case one slave unit is disconnected. The simulation results prove that master control and hysteresis current control perform well at different operating conditions.
2017 International Conference on Electrical and Computing Technologies and Applications (ICECTA), 2017
This paper presents an improved Voltage Oriented Control (VOC) scheme to control a three-phase gr... more This paper presents an improved Voltage Oriented Control (VOC) scheme to control a three-phase grid-connected 7-level diode clamped inverter, where this inverter is the Distributed Generation (DG) unit that is the core of the Distributed Generation System (DGS). An optimization method is used to recursively tune the parameters of the PID controller in the presented control scheme so as to achieve the optimal performance for the DG unit in a grid-connected mode. Simulation results are carried out to show the meritorious performance of the proposed control scheme while tracking the power references, which represent the required power to be injected by the DG unit to the distribution system.
This paper presents an improved Direct Power Control (DPC) scheme applied to the multilevel inver... more This paper presents an improved Direct Power Control (DPC) scheme applied to the multilevel inverter that forms a Distributed Generation Unit (DGU). This paper demonstrates the performance of active and reactive power injected by the DGU to the smart grid. The DPC is traditionally operated by the hysteresis controller with the Space Vector Modulation (SVM) which is applied on the 2-level inverters or 3-level inverters. In this paper, the DPC is operated by the PI controller with the Phase-Disposition Pulse Width Modulation (PD-PWM) applied to the 5-level diode clamped inverter. The new combination of the DPC, PI controller, PD-PWM and multilevel inverter proves that its performance is much better than the conventional hysteresis-SVM based DPC. Simulations results have been presented to validate the performance of the suggested control scheme in the grid-connected mode.
International Journal of Electrical Power & Energy Systems, 2014
ABSTRACT This paper exhibits new recursive implementation of the root-MUSIC algorithm in power sy... more ABSTRACT This paper exhibits new recursive implementation of the root-MUSIC algorithm in power system applications in order to extract the instantaneous power disturbances, which emanate from the arc furnace. The MUSIC algorithm is selected because it has an outstanding capability to estimate and track the frequencies of all types of distortion such as harmonics and interharmonics. The utilized algorithm has been newly developed so as to recursively track the instantaneous disturbances in the arc furnace current and consequently mitigate them. The suggested development of the recursive root-MUSIC is compared with the ESPRIT in order to prove that the adopted technique outperforms the high-resolution common techniques in a noisy or non-noisy environment. The instantaneous disturbance is formed by an innovative formulation of the recursive notch filter. Moreover, the experimental results are given to prove the practicality of the proposed concepts and techniques.
This paper introduces an efficient formulation of synergetic control that is based on an integral... more This paper introduces an efficient formulation of synergetic control that is based on an integral macro-variable function. This suggested integral synergetic control is integrated with the direct power control scheme to precisely adjust the injected power of the distributed generation units to the main power grid. To prove the advantageous performance of the suggested control scheme, the propounded control scheme is compared to the adaptive sliding mode control and PI controller based control scheme. The practicality of the suggested synergetic control is validated by some experimental results using rapid control prototyping through the dSpace SCALEXIO platform.
2016 5th International Conference on Electronic Devices, Systems and Applications (ICEDSA), 2016
This paper deals with controlling DC motor speed and/or torque through the multilevel Chopper cir... more This paper deals with controlling DC motor speed and/or torque through the multilevel Chopper circuit. The proposed switching circuit consists of four cascaded switching elements with three clamping diodes and four equal or different voltage sources connected in series. The configuration provides a constant five levels of voltage and has the ability to generate and track any reference input voltage within the source voltage range. The generated voltage has relatively very small harmonic and ripples compared to the traditional step down chopper. The profile of the generated voltage positively affects the performance of the motor armature current, the generated dynamic torque and the rotor. The simulation results show adequate voltage reference tracking, smooth speed response and reduced current and torque ripples, which normally reflect in smaller mechanical vibration and acoustic noise.
2022 International Conference on Power Energy Systems and Applications (ICoPESA)
The master-slave control is an important scheme to control the microgrid in both islanded and gri... more The master-slave control is an important scheme to control the microgrid in both islanded and grid-connected modes. It has been proved that it is competitive to the droop control schemes. This presented paper shows two techniques to control the current/power of the slave inverters to precisely adjust the injected output power of the slave inverters. The adopted microgrid contains two multilevel (five-level diode-clamped) inverters. One inverter is operated as a slave inverter and the remaining inverter is operated as a master inverter. The slave inverter can be operated using two techniques. The slave inverter is operated in a direct current control (DCC) mode using nested multiband hysteresis current control. While the second technique is the indirect current control (ICC) mode through the cascaded structure of power and current loops. Simulation results show a comparative analysis, which affirms that the DCC gives much better performance for current/power control, while the ICC gives a slightly better performance for voltage stabilization at loads.
International Journal of Smart Grid and Clean Energy, 2020
This paper presents an accurate tool for tracking the voltage unbalance in the microgrid. This ac... more This paper presents an accurate tool for tracking the voltage unbalance in the microgrid. This accurate tracking depends on a new formulation of the adaptive linear neuron (ADALINE). This formulation has accurate estimation/extraction of positive-, negative-, and zero-sequence voltages. The paper introduces a control scheme that stabilizes the voltages at the loads side by adjusting the positive voltage around 1 pu and mitigating the negativesequence voltage. This voltage stabilization is done through the developed control scheme, which has a cascadedloop structure for voltage and current control. The control scheme along with the suggested estimation tool gives accurate results for stabilizing the voltage at the loads side for different loading conditions.
2022 Advances in Science and Engineering Technology International Conferences (ASET), 2022
The master-slave control/operational scheme proves to be very efficient for operating any microgr... more The master-slave control/operational scheme proves to be very efficient for operating any microgrid in different modes: Islanded and grid-connected modes. The master-slave schemes prove to be competitive compared to the droop control schemes because of their admirable characteristics for the control/operation of AC microgrids. This presented paper employs the master-slave scheme as a control scheme for the operation of the microgrid. The adopted microgrid contains three multilevel (five-level diode-clamped) inverters. Two of them are operated as slave units, and the remaining unit is employed as a master unit. The slave units are operated in a current-controlled mode using developed multiband hysteresis current control. At the same time, the master inverter is operated in a voltage-controlled mode, which is responsible for maintaining both frequency and voltage at a certain level. In addition, the redundancy of the slave units is checked in case one slave unit is disconnected. The simulation results prove that master control and hysteresis current control perform well at different operating conditions.
2017 International Conference on Electrical and Computing Technologies and Applications (ICECTA), 2017
This paper presents an improved Voltage Oriented Control (VOC) scheme to control a three-phase gr... more This paper presents an improved Voltage Oriented Control (VOC) scheme to control a three-phase grid-connected 7-level diode clamped inverter, where this inverter is the Distributed Generation (DG) unit that is the core of the Distributed Generation System (DGS). An optimization method is used to recursively tune the parameters of the PID controller in the presented control scheme so as to achieve the optimal performance for the DG unit in a grid-connected mode. Simulation results are carried out to show the meritorious performance of the proposed control scheme while tracking the power references, which represent the required power to be injected by the DG unit to the distribution system.
This paper presents an improved Direct Power Control (DPC) scheme applied to the multilevel inver... more This paper presents an improved Direct Power Control (DPC) scheme applied to the multilevel inverter that forms a Distributed Generation Unit (DGU). This paper demonstrates the performance of active and reactive power injected by the DGU to the smart grid. The DPC is traditionally operated by the hysteresis controller with the Space Vector Modulation (SVM) which is applied on the 2-level inverters or 3-level inverters. In this paper, the DPC is operated by the PI controller with the Phase-Disposition Pulse Width Modulation (PD-PWM) applied to the 5-level diode clamped inverter. The new combination of the DPC, PI controller, PD-PWM and multilevel inverter proves that its performance is much better than the conventional hysteresis-SVM based DPC. Simulations results have been presented to validate the performance of the suggested control scheme in the grid-connected mode.
International Journal of Electrical Power & Energy Systems, 2014
ABSTRACT This paper exhibits new recursive implementation of the root-MUSIC algorithm in power sy... more ABSTRACT This paper exhibits new recursive implementation of the root-MUSIC algorithm in power system applications in order to extract the instantaneous power disturbances, which emanate from the arc furnace. The MUSIC algorithm is selected because it has an outstanding capability to estimate and track the frequencies of all types of distortion such as harmonics and interharmonics. The utilized algorithm has been newly developed so as to recursively track the instantaneous disturbances in the arc furnace current and consequently mitigate them. The suggested development of the recursive root-MUSIC is compared with the ESPRIT in order to prove that the adopted technique outperforms the high-resolution common techniques in a noisy or non-noisy environment. The instantaneous disturbance is formed by an innovative formulation of the recursive notch filter. Moreover, the experimental results are given to prove the practicality of the proposed concepts and techniques.
This paper introduces an efficient formulation of synergetic control that is based on an integral... more This paper introduces an efficient formulation of synergetic control that is based on an integral macro-variable function. This suggested integral synergetic control is integrated with the direct power control scheme to precisely adjust the injected power of the distributed generation units to the main power grid. To prove the advantageous performance of the suggested control scheme, the propounded control scheme is compared to the adaptive sliding mode control and PI controller based control scheme. The practicality of the suggested synergetic control is validated by some experimental results using rapid control prototyping through the dSpace SCALEXIO platform.
2016 5th International Conference on Electronic Devices, Systems and Applications (ICEDSA), 2016
This paper deals with controlling DC motor speed and/or torque through the multilevel Chopper cir... more This paper deals with controlling DC motor speed and/or torque through the multilevel Chopper circuit. The proposed switching circuit consists of four cascaded switching elements with three clamping diodes and four equal or different voltage sources connected in series. The configuration provides a constant five levels of voltage and has the ability to generate and track any reference input voltage within the source voltage range. The generated voltage has relatively very small harmonic and ripples compared to the traditional step down chopper. The profile of the generated voltage positively affects the performance of the motor armature current, the generated dynamic torque and the rotor. The simulation results show adequate voltage reference tracking, smooth speed response and reduced current and torque ripples, which normally reflect in smaller mechanical vibration and acoustic noise.
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Papers by Amr Elnady