Erhab Youssef | Universidade de Lisboa (original) (raw)
Papers by Erhab Youssef
IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society, 2019
In this paper, a Multi-Terminal Matrix Converter (MT-MC) is proposed for a Battery Energy Storage... more In this paper, a Multi-Terminal Matrix Converter (MT-MC) is proposed for a Battery Energy Storage System (BESS). The proposed MT-MC enables the connection of multiple batteries allowing their independent control. A nonlinear Predictive Optimal Controller is proposed to manage independently the charge/discharge process of the batteries and guarantee the connection to the grid with nearly unitary power factor. The validation of the proposed system is performed through simulation in MATLAB/Simulink. Simulation results show the high performance of MT-MC for two batteries at different operation scenarios allowing charging of one battery while the other is discharging, still guaranteeing current THD lower than 5% in the connection to the grid.
Energies, 2020
In this paper, a direct power predictive controller (DPPC) is derived for a current source invert... more In this paper, a direct power predictive controller (DPPC) is derived for a current source inverter (CSI) based single stage photovoltaic (PV) system. The equations of the dynamics, including AC and DC filters, are formulated directly for the PV power and for the active and reactive power injected in the grid. Then, the prediction equations are synthesized straight for the power, and, at each time instant, the optimal switching vector that guarantees simultaneously the control of the power generated by the PV arrays, and the control of the reactive power in the connection to the grid is chosen. This approach aims to guarantee fast and accurate tracking of the power. The proposed system is then validated through simulation and experimental results, showing that the PV system is able to follow the power references, guaranteeing a fast response to a step in the power, and decoupled active and reactive power control, with minimum total harmonic distortion (<5%) of the currents inject...
SoutheastCon 2015, 2015
The voltage stability of large scale renewable energy grid-connected system plays a major role in... more The voltage stability of large scale renewable energy grid-connected system plays a major role in a power system environment. Nowadays, Integration of large scale wind power may have severe impacts on the power system operation. Stable, reliable and economic operation of the power system under the massive integration of wind power is a big challenge to power system operators. This paper seeks to study the voltage stability problems for the integration of wind power and Photovoltaic (PV) to the IEEE-14 bus network. Modern analytical tools are demonstrated to study voltage stability analysis by using PV analysis and dynamic analysis. Comparative study is developed to present the behavior of voltage stability of the system that employs PV and different types of wind farms. These analyses define the amount of reactive power required to enhance voltage stability. Simulation of 14-IEEE network with integrated renewable energy sources is developed using PSS/E.
2010 1st International Nuclear & Renewable Energy Conference (INREC), 2010
ABSTRACT Induction generators are the most popular in wind energy conversion system due to its si... more ABSTRACT Induction generators are the most popular in wind energy conversion system due to its simplicity and absence of synchronization problem. However the major drawback of this machine is its additional reactive burden on the electric network. This paper studies the voltage stability of wind farms (WFs) Connected to IEEE 14 bus network during system disturbances such as a load change, three phase fault or island condition. Those disturbances have a great impact on the system voltages and frequency. A static synchronous compensator (STATCOM) is proposed to maintain voltage and frequency within grid codes requirements. The proposed system shows an excellent performance it maintains the voltage and frequency constants by injection controllable reactive power during system disturbances. MATLAB/SIMULINK and the Power System Analysis Toolbox (PSAT) package are used for the simulation.
… (UPEC), Proceedings of …, 2011
... GAMESA 850KW 15 DFIG Pitch 336 MMA Mahfouz AM Amin Erhab B. Youssef Electrical Power and Mach... more ... GAMESA 850KW 15 DFIG Pitch 336 MMA Mahfouz AM Amin Erhab B. Youssef Electrical Power and Machines Dept.,Helwan university, Egypt mohamed.mahfouz@yahoo.co.uk ... 2007. [2] Z. Chen, F. Blaabjerg.” Wind farm—a power source in future power systems”. ...
International Journal of Scientific & Technology Research, 2015
The electric power utilities seek to take advantage of novel approaches to meet growing energy de... more The electric power utilities seek to take advantage of novel approaches to meet growing energy demand. Utilities are under pressure to evolve their classical topologies to increase the usage of distributed generation. Currently, the electrical power engineers in many regions of the world are implementing manual methods to measure power consumption for farther assessment of voltage violation. Such process proved to be time consuming, costly and inaccurate. Also, demand response is a grid management technique where retail or wholesale customers are requested either electronically or manually to reduce their load. Therefore, this paper aims to design and model an automated power system for optimal new load locations, using DPL (DIgSILENT Programming Language). This study is a diagnostic approach that assists system operator about any voltage violation cases that would happen during adding new load to the grid. The process of identifying the optimal bus bar location involves a complicat...
Advances in Renewable Energies and Power Technologies
Energies
In this paper, a direct power predictive controller (DPPC) is derived for a current source invert... more In this paper, a direct power predictive controller (DPPC) is derived for a current source inverter (CSI) based single stage photovoltaic (PV) system. The equations of the dynamics, including AC and DC filters, are formulated directly for the PV power and for the active and reactive power injected in the grid. Then, the prediction equations are synthesized straight for the power, and, at each time instant, the optimal switching vector that guarantees simultaneously the control of the power generated by the PV arrays, and the control of the reactive power in the connection to the grid is chosen. This approach aims to guarantee fast and accurate tracking of the power. The proposed system is then validated through simulation and experimental results, showing that the PV system is able to follow the power references, guaranteeing a fast response to a step in the power, and decoupled active and reactive power control, with minimum total harmonic distortion (<5%) of the currents inject...
International Journal of Smart Grid and Clean Energy, 2015
Concentrated Photovoltaic modules (CPV) use optics, such as lenses to concentrate a large amount ... more Concentrated Photovoltaic modules (CPV) use optics, such as lenses to concentrate a large amount of sunlight onto a small area of solar photovoltaic materials to generate electricity. The solar irradiance level and landscape area are considered as main factors in CPV site on the network. These factors are not sufficient for improving the CPV performance and grid integration .The coupling point of CPV to the grid is an important role and affects the network stability. This paper focuses on the influence study of CPV location on voltage stability .PSS/E has been used as a tool for simulation and validation the integration of CPV to 14-IEEE network as benchmark test. Ac contingency analysis tool is used to study the voltage stability at different cases and locations of CPV. Results indicate that the distributed CPV improves the voltage stability of the network, rather than centralized CPV. Distributed CPV connects at different locations and near to the load. Therefore, the impact of distributed CPV is minimized with respect to voltage stability issue.
2010 1st International Nuclear & Renewable Energy Conference (INREC), 2010
Induction generators are the most popular in wind energy conversion system due to its simplicity ... more Induction generators are the most popular in wind energy conversion system due to its simplicity and absence of synchronization problem. However the major drawback of this machine is its additional reactive burden on the electric network. This paper studies the voltage stability of wind farms (WFs) Connected to IEEE 14 bus network during system disturbances such as a load change, three phase fault or island condition. Those disturbances have a great impact on the system voltages and frequency. A static synchronous compensator (STATCOM) is proposed to maintain voltage and frequency within grid codes requirements. The proposed system shows an excellent performance it maintains the voltage and frequency constants by injection controllable reactive power during system disturbances. MATLAB/SIMULINK and the Power System Analysis Toolbox (PSAT) package are used for the simulation.
IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society, 2019
In this paper, a Multi-Terminal Matrix Converter (MT-MC) is proposed for a Battery Energy Storage... more In this paper, a Multi-Terminal Matrix Converter (MT-MC) is proposed for a Battery Energy Storage System (BESS). The proposed MT-MC enables the connection of multiple batteries allowing their independent control. A nonlinear Predictive Optimal Controller is proposed to manage independently the charge/discharge process of the batteries and guarantee the connection to the grid with nearly unitary power factor. The validation of the proposed system is performed through simulation in MATLAB/Simulink. Simulation results show the high performance of MT-MC for two batteries at different operation scenarios allowing charging of one battery while the other is discharging, still guaranteeing current THD lower than 5% in the connection to the grid.
Energies, 2020
In this paper, a direct power predictive controller (DPPC) is derived for a current source invert... more In this paper, a direct power predictive controller (DPPC) is derived for a current source inverter (CSI) based single stage photovoltaic (PV) system. The equations of the dynamics, including AC and DC filters, are formulated directly for the PV power and for the active and reactive power injected in the grid. Then, the prediction equations are synthesized straight for the power, and, at each time instant, the optimal switching vector that guarantees simultaneously the control of the power generated by the PV arrays, and the control of the reactive power in the connection to the grid is chosen. This approach aims to guarantee fast and accurate tracking of the power. The proposed system is then validated through simulation and experimental results, showing that the PV system is able to follow the power references, guaranteeing a fast response to a step in the power, and decoupled active and reactive power control, with minimum total harmonic distortion (<5%) of the currents inject...
SoutheastCon 2015, 2015
The voltage stability of large scale renewable energy grid-connected system plays a major role in... more The voltage stability of large scale renewable energy grid-connected system plays a major role in a power system environment. Nowadays, Integration of large scale wind power may have severe impacts on the power system operation. Stable, reliable and economic operation of the power system under the massive integration of wind power is a big challenge to power system operators. This paper seeks to study the voltage stability problems for the integration of wind power and Photovoltaic (PV) to the IEEE-14 bus network. Modern analytical tools are demonstrated to study voltage stability analysis by using PV analysis and dynamic analysis. Comparative study is developed to present the behavior of voltage stability of the system that employs PV and different types of wind farms. These analyses define the amount of reactive power required to enhance voltage stability. Simulation of 14-IEEE network with integrated renewable energy sources is developed using PSS/E.
2010 1st International Nuclear & Renewable Energy Conference (INREC), 2010
ABSTRACT Induction generators are the most popular in wind energy conversion system due to its si... more ABSTRACT Induction generators are the most popular in wind energy conversion system due to its simplicity and absence of synchronization problem. However the major drawback of this machine is its additional reactive burden on the electric network. This paper studies the voltage stability of wind farms (WFs) Connected to IEEE 14 bus network during system disturbances such as a load change, three phase fault or island condition. Those disturbances have a great impact on the system voltages and frequency. A static synchronous compensator (STATCOM) is proposed to maintain voltage and frequency within grid codes requirements. The proposed system shows an excellent performance it maintains the voltage and frequency constants by injection controllable reactive power during system disturbances. MATLAB/SIMULINK and the Power System Analysis Toolbox (PSAT) package are used for the simulation.
… (UPEC), Proceedings of …, 2011
... GAMESA 850KW 15 DFIG Pitch 336 MMA Mahfouz AM Amin Erhab B. Youssef Electrical Power and Mach... more ... GAMESA 850KW 15 DFIG Pitch 336 MMA Mahfouz AM Amin Erhab B. Youssef Electrical Power and Machines Dept.,Helwan university, Egypt mohamed.mahfouz@yahoo.co.uk ... 2007. [2] Z. Chen, F. Blaabjerg.” Wind farm—a power source in future power systems”. ...
International Journal of Scientific & Technology Research, 2015
The electric power utilities seek to take advantage of novel approaches to meet growing energy de... more The electric power utilities seek to take advantage of novel approaches to meet growing energy demand. Utilities are under pressure to evolve their classical topologies to increase the usage of distributed generation. Currently, the electrical power engineers in many regions of the world are implementing manual methods to measure power consumption for farther assessment of voltage violation. Such process proved to be time consuming, costly and inaccurate. Also, demand response is a grid management technique where retail or wholesale customers are requested either electronically or manually to reduce their load. Therefore, this paper aims to design and model an automated power system for optimal new load locations, using DPL (DIgSILENT Programming Language). This study is a diagnostic approach that assists system operator about any voltage violation cases that would happen during adding new load to the grid. The process of identifying the optimal bus bar location involves a complicat...
Advances in Renewable Energies and Power Technologies
Energies
In this paper, a direct power predictive controller (DPPC) is derived for a current source invert... more In this paper, a direct power predictive controller (DPPC) is derived for a current source inverter (CSI) based single stage photovoltaic (PV) system. The equations of the dynamics, including AC and DC filters, are formulated directly for the PV power and for the active and reactive power injected in the grid. Then, the prediction equations are synthesized straight for the power, and, at each time instant, the optimal switching vector that guarantees simultaneously the control of the power generated by the PV arrays, and the control of the reactive power in the connection to the grid is chosen. This approach aims to guarantee fast and accurate tracking of the power. The proposed system is then validated through simulation and experimental results, showing that the PV system is able to follow the power references, guaranteeing a fast response to a step in the power, and decoupled active and reactive power control, with minimum total harmonic distortion (<5%) of the currents inject...
International Journal of Smart Grid and Clean Energy, 2015
Concentrated Photovoltaic modules (CPV) use optics, such as lenses to concentrate a large amount ... more Concentrated Photovoltaic modules (CPV) use optics, such as lenses to concentrate a large amount of sunlight onto a small area of solar photovoltaic materials to generate electricity. The solar irradiance level and landscape area are considered as main factors in CPV site on the network. These factors are not sufficient for improving the CPV performance and grid integration .The coupling point of CPV to the grid is an important role and affects the network stability. This paper focuses on the influence study of CPV location on voltage stability .PSS/E has been used as a tool for simulation and validation the integration of CPV to 14-IEEE network as benchmark test. Ac contingency analysis tool is used to study the voltage stability at different cases and locations of CPV. Results indicate that the distributed CPV improves the voltage stability of the network, rather than centralized CPV. Distributed CPV connects at different locations and near to the load. Therefore, the impact of distributed CPV is minimized with respect to voltage stability issue.
2010 1st International Nuclear & Renewable Energy Conference (INREC), 2010
Induction generators are the most popular in wind energy conversion system due to its simplicity ... more Induction generators are the most popular in wind energy conversion system due to its simplicity and absence of synchronization problem. However the major drawback of this machine is its additional reactive burden on the electric network. This paper studies the voltage stability of wind farms (WFs) Connected to IEEE 14 bus network during system disturbances such as a load change, three phase fault or island condition. Those disturbances have a great impact on the system voltages and frequency. A static synchronous compensator (STATCOM) is proposed to maintain voltage and frequency within grid codes requirements. The proposed system shows an excellent performance it maintains the voltage and frequency constants by injection controllable reactive power during system disturbances. MATLAB/SIMULINK and the Power System Analysis Toolbox (PSAT) package are used for the simulation.