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The precision of the PV model greatly influences the simulation results to enhance the effectiveness of photovoltaic (PV) energy systems. The PV mathematical model is based on a remarkably nonlinear relationship of its I-V characteristic. The data sheets of overall PV cells do not supply complete information of its parameters. This leads to a nonlinear mathematical model of PV with numerous unknown parameters. Consequently, in this paper, a new application of an appropriate optimization algorithm called Chaos Game Optimization algorithm (CGO) is proposed for estimating the unknown parameters of the three-diode (TD) PV model. The simulation results are carried out for PV real cells and PV module which with varying the temperature and irradiation. The proposed model of the PV module is evaluated by matching its results with the actual PV modules experimental results. To confirm the performance of the CGO algorithm in extracting the parameters of the PV model, its results are compared with the most present and robust techniques results in the literature. The results show that the CGO algorithm attains the least Root Mean Square Error (RMSE), the mean and standard deviation as the best solution. In addition, CGO provides the smallest implementation time compared with the other investigated algorithms.
Abdelhady Ramadan; Salah Kamel; Mahmoud M. Hussein; Mohamed H. Hassan. A New Application of Chaos Game Optimization Algorithm for Parameters Extraction of Three Diode Photovoltaic Model. IEEE Access 2021, 9, 51582 -51594.
AMA StyleAbdelhady Ramadan, Salah Kamel, Mahmoud M. Hussein, Mohamed H. Hassan. A New Application of Chaos Game Optimization Algorithm for Parameters Extraction of Three Diode Photovoltaic Model. IEEE Access. 2021; 9 (99):51582-51594.
Chicago/Turabian StyleAbdelhady Ramadan; Salah Kamel; Mahmoud M. Hussein; Mohamed H. Hassan. 2021. "A New Application of Chaos Game Optimization Algorithm for Parameters Extraction of Three Diode Photovoltaic Model." IEEE Access 9, no. 99: 51582-51594.
The intermittent photovoltaic (PV) units significantly affect the performance of distribution systems, and they often cause several operational problems, most importantly, voltage rise/drop. At high PV penetration, excessive tap movements of transformers and high curtailed PV power are expected to completely solve the voltage violation problem. In this paper, we propose an optimal voltage control method for distribution systems considering the number of tap movements of transformers and the active power curtailment of PV units. The objective function of the proposed method comprises: 1) voltage drop violation, 2) voltage rise violation, 3) tap movement rate (TMR) of transformers, and 4) curtailed power of PV (CPPV). A multiobjective grey wolf optimizer integrated with a Lévy mutation operator (GWO-Lévy) is formulated to accurately solve the voltage control problem. A 24-h simulation is performed on the 119-bus distribution system with PV and different types of loads. The performance of GWO-Lévy is compared with three other optimizers, finding that it achieves the best performance. The simulation results demonstrate the efficacy of the proposed method for solving the voltage violation problem with PV while simultaneously optimizing TMR and CPPV.
Karar Mahmoud; Mahmoud M. Hussein; Mohamed Abdel-Nasser; Matti Lehtonen. Optimal Voltage Control in Distribution Systems With Intermittent PV Using Multiobjective Grey-Wolf-Lévy Optimizer. IEEE Systems Journal 2019, 14, 760 -770.
AMA StyleKarar Mahmoud, Mahmoud M. Hussein, Mohamed Abdel-Nasser, Matti Lehtonen. Optimal Voltage Control in Distribution Systems With Intermittent PV Using Multiobjective Grey-Wolf-Lévy Optimizer. IEEE Systems Journal. 2019; 14 (1):760-770.
Chicago/Turabian StyleKarar Mahmoud; Mahmoud M. Hussein; Mohamed Abdel-Nasser; Matti Lehtonen. 2019. "Optimal Voltage Control in Distribution Systems With Intermittent PV Using Multiobjective Grey-Wolf-Lévy Optimizer." IEEE Systems Journal 14, no. 1: 760-770.
This paper presents a simple control strategy for supplying an active and reactive power into the grid from a photovoltaic (PV) energy system. The PV panels are connected with the grid through a DC-DC boost converter and a voltage source inverter (VSI). The VSI is controlled for supplying an active and reactive power with different power factors (lagging, unity, and leading) into the grid. It is also controlled to achieve a constant value of voltage at the DC-link voltage. The control strategy works very well under the variations of temperature and irradiance for supplying power with different power factors into the grid. The MATLAB/SIMULINK environment software program has been used to indicate the high performance of the control strategy though the simulation results.
Mahmoud Hussein. Control of a Grid Connected PV Inverter for Supplying Powers with Different Power Factors. 2018 Twentieth International Middle East Power Systems Conference (MEPCON) 2018, 440 -445.
AMA StyleMahmoud Hussein. Control of a Grid Connected PV Inverter for Supplying Powers with Different Power Factors. 2018 Twentieth International Middle East Power Systems Conference (MEPCON). 2018; ():440-445.
Chicago/Turabian StyleMahmoud Hussein. 2018. "Control of a Grid Connected PV Inverter for Supplying Powers with Different Power Factors." 2018 Twentieth International Middle East Power Systems Conference (MEPCON) , no. : 440-445.
Adaptive control algorithm is considered as one of the effective solutions of the load frequency control issue. It gives a solution of problems of fixed parameters conventional controllers by achieving an online tuning of the gains of the controllers. A Jaya approach as a recent optimization method has been used in this paper to do this online tuning of the classical PID controller. Matlab/Simulink has been utilized to make a digital simulation. Digital results prove that, the microgrid power system that uses the proposed adaptive control method gives more robust frequency response comparing with the system that uses the fixed parameters control method in case of step load change and random load variation.
Tarek Hassan Mohamed; Mahmoud Hussein. Online Gain Tuning of Conventional Load Frequency Controller for Microgrid Power System. 2018 Twentieth International Middle East Power Systems Conference (MEPCON) 2018, 424 -428.
AMA StyleTarek Hassan Mohamed, Mahmoud Hussein. Online Gain Tuning of Conventional Load Frequency Controller for Microgrid Power System. 2018 Twentieth International Middle East Power Systems Conference (MEPCON). 2018; ():424-428.
Chicago/Turabian StyleTarek Hassan Mohamed; Mahmoud Hussein. 2018. "Online Gain Tuning of Conventional Load Frequency Controller for Microgrid Power System." 2018 Twentieth International Middle East Power Systems Conference (MEPCON) , no. : 424-428.
In this paper, an optimal voltage regulation control method considering the inverter of photovoltaic (PV-inverter) and the on-load tap-changer (OLTC) transformer in distribution systems using a grey wolf optimizer (GWO) is proposed. The PV-inverter is incorporated with OLTC for minimizing the voltage deviation, thereby effectively preventing voltage rise/drop caused by the intermittent generation of PV. The proposed method can completely solve the real-time voltage regulation problems with high PV penetration. The 11 kV 119-bus large-scale distribution system is used to verify the effectiveness of the proposed optimal voltage control method. A 24-hour simulation is performed considering load and PV variation. The simulation results reveal that the use of the cooperative control method of the PV inverter and OLTC is better than the use of PV-inverter alone.
Mahmoud Hussein; Karar Mahmoud; Mohamed Abdel-Nasser. Optimal voltage control considering PV-inverter and OLTC using grey wolf optimizer. 2018 International Conference on Innovative Trends in Computer Engineering (ITCE) 2018, 473 -477.
AMA StyleMahmoud Hussein, Karar Mahmoud, Mohamed Abdel-Nasser. Optimal voltage control considering PV-inverter and OLTC using grey wolf optimizer. 2018 International Conference on Innovative Trends in Computer Engineering (ITCE). 2018; ():473-477.
Chicago/Turabian StyleMahmoud Hussein; Karar Mahmoud; Mohamed Abdel-Nasser. 2018. "Optimal voltage control considering PV-inverter and OLTC using grey wolf optimizer." 2018 International Conference on Innovative Trends in Computer Engineering (ITCE) , no. : 473-477.
In this paper, a combined static VAR compensator (SVC) and photovoltaic (PV) system is proposed to properly manage the voltages in distribution systems. The SVC is incorporated into the PV system for allowing further reactive power supply, thereby effectively preventing voltage rise/drop caused by the intermittent generation of PV. The reactive power capabilities of SVC and the inverter of PV are managed by a cooperative control method. The 11 kV 119-bus large-scale distribution system is used to verify the effectiveness of the proposed combined system. A 24-hour simulation is performed considering load and PV variation. The simulation results demonstrate that the combined system can completely solve the voltage regulation problems with high PV penetration.
Karar Mahmoud; Mahmoud Hussein. Combined static VAR compensator and PV-inverter for regulating voltage in distribution systems. 2017 Nineteenth International Middle East Power Systems Conference (MEPCON) 2017, 683 -688.
AMA StyleKarar Mahmoud, Mahmoud Hussein. Combined static VAR compensator and PV-inverter for regulating voltage in distribution systems. 2017 Nineteenth International Middle East Power Systems Conference (MEPCON). 2017; ():683-688.
Chicago/Turabian StyleKarar Mahmoud; Mahmoud Hussein. 2017. "Combined static VAR compensator and PV-inverter for regulating voltage in distribution systems." 2017 Nineteenth International Middle East Power Systems Conference (MEPCON) , no. : 683-688.
In this paper a comparative study of four different control algorithms(instantaneous power theory (p - q), power balance theory (PBT), Icos φ theory and synchronous current detection method (SCDM) of a three-phase three wire shunt active power filter (SAPF) for non-linear loads is presented for power quality improvement. With all algorithms, the control generates a reference current and compared with filter injected current through a current controller where the current controller uses sinusoidal pulse width modulation technique for generating six pulses to drive IGBT to make the source current sinusoidal and reduce the total harmonic distortion (THD) less than 5% for meeting the IEEE standard. The simulation results demonstrate that the Icosφ algorithm gives the best reduction of THD compared with other algorithms.
Gaber Shabib; Mahmoud Hussein; Mahmoud Mohammed Hasseeb. Comparative study of different control algorithms of shunt active power filter for non-linear loads. 2017 Nineteenth International Middle East Power Systems Conference (MEPCON) 2017, 1037 -1043.
AMA StyleGaber Shabib, Mahmoud Hussein, Mahmoud Mohammed Hasseeb. Comparative study of different control algorithms of shunt active power filter for non-linear loads. 2017 Nineteenth International Middle East Power Systems Conference (MEPCON). 2017; ():1037-1043.
Chicago/Turabian StyleGaber Shabib; Mahmoud Hussein; Mahmoud Mohammed Hasseeb. 2017. "Comparative study of different control algorithms of shunt active power filter for non-linear loads." 2017 Nineteenth International Middle East Power Systems Conference (MEPCON) , no. : 1037-1043.
The occurrence of voltage instabilities or voltage collapses depend on the duration of the persistence of the fault and on the type of fault, some faults lead to voltage instabilities, others lead to voltage collapse. Evaluation of fault durations causing occurrence of voltage instabilities is the main goal of this paper. This paper searches for the effect of nodes short circuit levels NSCL and its duration periods initiation of voltage instability, with lagging and leading load power factors at certain loads buses. In this paper, the power system dynamic simulation program is developed for dynamic analysis of voltage stability. This paper is concerned with the fault duration which lead to the occurrence of voltage instability phenomena due to NSCL. The fault which lead to voltage instability is found to be short circuits at certain nodes cleared without any variation in the transmission system elements, i.e. the post-fault conditions will be the same as the pre-fault conditions. Models for loads considered in this study are induction motors with three different shaft mechanical loads, constant impedance CZ loads, constant current CI loads and constant power CP loads are used, as they depict the behavior of most power system loads. The influence of the transmission network impedances, which are nearly the inverse of the NSCL, on the fault duration which lead to the occurrence of voltage instabilities are studied and evaluated using various load representations.
Youssef Ahmed Mobarak; Mahmoud Hussein. Voltage Instability of Initiation Fault Duration as Influenced by Nodes Short Circuit Levels NSCL with Different Types of Loads. International Journal of Electrical and Computer Engineering (IJECE) 2016, 6, 1305 .
AMA StyleYoussef Ahmed Mobarak, Mahmoud Hussein. Voltage Instability of Initiation Fault Duration as Influenced by Nodes Short Circuit Levels NSCL with Different Types of Loads. International Journal of Electrical and Computer Engineering (IJECE). 2016; 6 (3):1305.
Chicago/Turabian StyleYoussef Ahmed Mobarak; Mahmoud Hussein. 2016. "Voltage Instability of Initiation Fault Duration as Influenced by Nodes Short Circuit Levels NSCL with Different Types of Loads." International Journal of Electrical and Computer Engineering (IJECE) 6, no. 3: 1305.
This paper presented both the linear quadratic Gaussian technique (LQG) and the coefficient diagram method (CDM) as load frequency controllers in a multi-area power system to deal with the problem of variations in system parameters and load demand change. The full states of the system including the area frequency deviation have been estimated using the Kalman filter technique. The efficiency of the proposed control method has been checked using a digital simulation. Simulation results indicated that, with the proposed CDM + LQG technique, the system is robust in the face of parameter uncertainties and load disturbances. A comparison between the proposed technique and other schemes is carried out, confirming the superiority of the proposed CDM + LQG technique.
Tarek Hassan Mohamed; Ahmed A. Zaki Diab; Mahmoud Hussein. Application of Linear Quadratic Gaussian and Coefficient Diagram Techniques to Distributed Load Frequency Control of Power Systems. Applied Sciences 2015, 5, 1603 -1615.
AMA StyleTarek Hassan Mohamed, Ahmed A. Zaki Diab, Mahmoud Hussein. Application of Linear Quadratic Gaussian and Coefficient Diagram Techniques to Distributed Load Frequency Control of Power Systems. Applied Sciences. 2015; 5 (4):1603-1615.
Chicago/Turabian StyleTarek Hassan Mohamed; Ahmed A. Zaki Diab; Mahmoud Hussein. 2015. "Application of Linear Quadratic Gaussian and Coefficient Diagram Techniques to Distributed Load Frequency Control of Power Systems." Applied Sciences 5, no. 4: 1603-1615.
This paper presents a simple control strategy for the operation of a variable speed stand-alone wind turbine with a permanent magnet synchronous generator (PMSG). The PMSG is connected to a three phase resistive load through a switch mode rectifier and a voltage source inverter. Control of the generator side converter is used to achieve maximum power extraction from the available wind power. Control of the DC-DC bidirectional buck-boost converter, which is connected between batteries bank and DC-link voltage, is used to maintain the DC-link voltage at a constant value. It is also used to make the batteries bank stores the surplus of wind energy and supplies this energy to the load during a wind power shortage. The load side voltage source inverter uses a relatively complex vector control scheme to control the output load voltage in terms of amplitude and frequency. The control strategy works under wind speed variation as well as with variable load. Extensive simulation results have been performed using MATLAB/SIMULINK.
Mahmoud M. Hussein; Tomonobu Senjyu; Mohamed Orabi; Mohamed A. A. Wahab; Mohamed M. Hamada. Control of a Stand-Alone Variable Speed Wind Energy Supply System. Applied Sciences 2013, 3, 437 -456.
AMA StyleMahmoud M. Hussein, Tomonobu Senjyu, Mohamed Orabi, Mohamed A. A. Wahab, Mohamed M. Hamada. Control of a Stand-Alone Variable Speed Wind Energy Supply System. Applied Sciences. 2013; 3 (2):437-456.
Chicago/Turabian StyleMahmoud M. Hussein; Tomonobu Senjyu; Mohamed Orabi; Mohamed A. A. Wahab; Mohamed M. Hamada. 2013. "Control of a Stand-Alone Variable Speed Wind Energy Supply System." Applied Sciences 3, no. 2: 437-456.
This paper presents a simple control strategy for the operation of a variable speed stand-alone wind turbine with a permanent magnet synchronous generator (PMSG). The PMSG is connected to a three phase resistive load through a switch mode rectifier and a voltage source inverter. Control of the generator side switch mode rectifier is used to achieve maximum power extraction from wind power. Control of the DC-DC bidirectional buck-boost converter, which is connected between batteries bank and DC-link voltage, is used to maintain the DC-link voltage at a constant value. It is also used to make the batteries bank stores a surplus of wind energy and supplies this energy to the load during a wind power shortage. The load side voltage source inverter uses a relatively complex vector control scheme to control the output load voltage in terms of amplitude and frequency. The control strategy works under wind speed variation as well as with variable load. Extensive simulations have been performed using MATLAB/SIMULINK. Simulation results demonstrate that the controller performs very well in spite of variation in wind speed and load.
Mahmoud Hussein; Tomonobu Senjyu; Mohamed Orabi; Mohamed A. A. Wahab; Mohamed M. Hamada; Margarida M. Hamada. Control of a variable speed stand alone wind energy supply system. 2012 IEEE International Conference on Power and Energy (PECon) 2012, 71 -76.
AMA StyleMahmoud Hussein, Tomonobu Senjyu, Mohamed Orabi, Mohamed A. A. Wahab, Mohamed M. Hamada, Margarida M. Hamada. Control of a variable speed stand alone wind energy supply system. 2012 IEEE International Conference on Power and Energy (PECon). 2012; ():71-76.
Chicago/Turabian StyleMahmoud Hussein; Tomonobu Senjyu; Mohamed Orabi; Mohamed A. A. Wahab; Mohamed M. Hamada; Margarida M. Hamada. 2012. "Control of a variable speed stand alone wind energy supply system." 2012 IEEE International Conference on Power and Energy (PECon) , no. : 71-76.
This paper presents a load power management control strategy for the operation of a stand-alone variable speed wind turbine with a permanent magnet synchronous generator (PMSG) based on the state of charge (SOC) of the battery. The PMSG is connected to a three phase load through a switch mode rectifier and a voltage source inverter. Battery storage system is connected to the DC-link voltage through a DC-DC bidirectional converter to maintain the DC-link voltage at constant value. Also, it is used to make the batteries bank stores a surplus of wind energy and supplies this energy to the load during a wind power shortage. The SOC changes during charges/discharges the batteries bank. The instantaneous change in the SOC and its value are used to connect/disconnect some loads to/from the consumers' load. The voltage source inverter uses a relatively complex vector control scheme to control the output load voltage in terms of amplitude and frequency under variation of wind speed and load. Control of the generator side switch mode rectifier is used to extract maximum power from available wind power. Extensive simulations have been performed using MATLAB/SIMULINK. Simulation results demonstrate that the performance of the controller is quite satisfactory.
Mahmoud Hussein; Tomonobu Senjyu; Mohamed Orabi; Mohamed A. A. Wahab; Mohamed M. Hamada; Margarida M. Hamada. Load power management control for a stand alone wind energy system based on the state of charge of the battery. 2012 IEEE International Conference on Power and Energy (PECon) 2012, 93 -98.
AMA StyleMahmoud Hussein, Tomonobu Senjyu, Mohamed Orabi, Mohamed A. A. Wahab, Mohamed M. Hamada, Margarida M. Hamada. Load power management control for a stand alone wind energy system based on the state of charge of the battery. 2012 IEEE International Conference on Power and Energy (PECon). 2012; ():93-98.
Chicago/Turabian StyleMahmoud Hussein; Tomonobu Senjyu; Mohamed Orabi; Mohamed A. A. Wahab; Mohamed M. Hamada; Margarida M. Hamada. 2012. "Load power management control for a stand alone wind energy system based on the state of charge of the battery." 2012 IEEE International Conference on Power and Energy (PECon) , no. : 93-98.
This paper presents a simple control strategy for a variable speed wind energy conversion system with a permanent magnet synchronous generator (PMSG). PMSG is connected to the grid through a switch mode rectifier and a voltage source inverter. The grid should be supplied by certain levels of powers for certain times from wind energy system according to a certain schedule. Batteries bank is connected to the DC-link voltage through a DC-DC bidirectional converter to maintain the DC voltage at constant value. Also it is used to make batteries bank stores a surplus of wind energy and supplies this energy to the grid during the wind power shortage. Voltage source inverter, at the grid side, uses a relatively complex vector control scheme to supply power at unity power factor into the grid. Simulation results have been performed using MATLAB/SIMULINK. It demonstrates that the controller performs very well in spite of variation in wind speed and demanded grid power. Also, maximum power extraction from wind turbine can be achieved through the switch mode rectifier control at the generator side.
Mahmoud Hussein; Tomonobu Senjyu; Mohamed Orabi; Mohamed A. A. Wahab; Mohamed M. Hamada; Margarida M. Hamada. Control of a grid connected variable speed wind energy conversion system. 2012 International Conference on Renewable Energy Research and Applications (ICRERA) 2012, 1 -5.
AMA StyleMahmoud Hussein, Tomonobu Senjyu, Mohamed Orabi, Mohamed A. A. Wahab, Mohamed M. Hamada, Margarida M. Hamada. Control of a grid connected variable speed wind energy conversion system. 2012 International Conference on Renewable Energy Research and Applications (ICRERA). 2012; ():1-5.
Chicago/Turabian StyleMahmoud Hussein; Tomonobu Senjyu; Mohamed Orabi; Mohamed A. A. Wahab; Mohamed M. Hamada; Margarida M. Hamada. 2012. "Control of a grid connected variable speed wind energy conversion system." 2012 International Conference on Renewable Energy Research and Applications (ICRERA) , no. : 1-5.
A new and simple maximum power extraction control strategy is proposed for the permanent magnet synchronous generator (PMSG) based variable speed wind energy conversion system (VSWECS). The PMSG is connected to the grid through a switch mode rectifier and a three phase voltage source (VSI) inverter. The generator side switch mode rectifier is controlled to achieve maximum power from wind. Simple estimating of PMSG generator speed, using estimated generator speed to calculate mechanical power generated from wind, and optimum power coefficient can be achieved from the relation governed the generator speed and mechanical power. The grid side voltage source inverter uses a hysteresis current controller to supply power at unity power factor into the grid. Extensive simulations have been performed using MATALB/SIMULINK. Simulation results show that the controller can extract maximum power from the wind and achieve unity power factor at the grid with different wind speed.
Mahmoud Hussein; Tomonobu Senjyu; Mohamed Orabi; Mohamed A. A. Wahab; Mohamed M. Hamada. Simple maximum power extraction control for permanent magnet synchronous generator based wind energy conversion system. 2012 Japan-Egypt Conference on Electronics, Communications and Computers 2012, 194 -199.
AMA StyleMahmoud Hussein, Tomonobu Senjyu, Mohamed Orabi, Mohamed A. A. Wahab, Mohamed M. Hamada. Simple maximum power extraction control for permanent magnet synchronous generator based wind energy conversion system. 2012 Japan-Egypt Conference on Electronics, Communications and Computers. 2012; ():194-199.
Chicago/Turabian StyleMahmoud Hussein; Tomonobu Senjyu; Mohamed Orabi; Mohamed A. A. Wahab; Mohamed M. Hamada. 2012. "Simple maximum power extraction control for permanent magnet synchronous generator based wind energy conversion system." 2012 Japan-Egypt Conference on Electronics, Communications and Computers , no. : 194-199.
This paper proposes a simple technique to get maximum power of wind energy conversion system (WECS) without using sensors for wind and rotor speed of the permanent magnet synchronous generator (PMSG). It uses the measurements of DC current and DC voltage to obtain maximum power point tracking (MPPT) by controlling the duty cycle of the DC-DC boost converter switch. Moreover, a PI control is employed to control the output voltage and current of a single-phase voltage source inverter, which is used to connect the system to the grid. In this case, the active and reactive power can be controlled independently. Using the proposed technique to get MPPT requires only the measurements of DC current and DC voltage after the uncontrolled rectifier. From these measurements of the DC voltage and current, the DC power can be calculated easily and thus the MPP can be attained. Therefore the optimum value of the power coefficient of wind turbine (Cp) can be reached. Accuracy of this technique for getting MPPT is verified through simulation results.
Mahmoud Hussein; Mohamed Orabi; Mahrous E. Ahmed; Mahmoud A. Sayed. Simple sensorless control technique of permanent magnet synchronous generator wind turbine. 2010 IEEE International Conference on Power and Energy 2010, 512 -517.
AMA StyleMahmoud Hussein, Mohamed Orabi, Mahrous E. Ahmed, Mahmoud A. Sayed. Simple sensorless control technique of permanent magnet synchronous generator wind turbine. 2010 IEEE International Conference on Power and Energy. 2010; ():512-517.
Chicago/Turabian StyleMahmoud Hussein; Mohamed Orabi; Mahrous E. Ahmed; Mahmoud A. Sayed. 2010. "Simple sensorless control technique of permanent magnet synchronous generator wind turbine." 2010 IEEE International Conference on Power and Energy , no. : 512-517.