Adel Mehdi - Academia.edu (original) (raw)

Adel Mehdi

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Papers by Adel Mehdi

Research paper thumbnail of Two Vector Based Direct Power Control of AC/DC Grid Connected Converters Using a Constant Switching Frequency

Journal of Power Electronics, 2017

In this paper, an improved Direct Power Control (DPC) algorithm is presented for grid connected t... more In this paper, an improved Direct Power Control (DPC) algorithm is presented for grid connected three phase PWM rectifiers. The new DPC approach is based on two main tasks. First the optimization of the look-up table, which is well-known in conventional DPC, is outlined for selecting the optimum converter output voltage vectors. Secondly a very simple and effective method is used to directly calculate their duty cycles from the power errors. Therefore, the measured active and reactive powers are made to track their references using hysteresis controllers. Then two vectors are selected and applied during one control cycle to minimize both the active and reactive power ripples. The main advantages of this method are that there is no need of linear current controllers, coordinates transformations or modulators. In addition, the control strategy is able to operate at constant switching frequencies to ease the design of the power converter and the AC harmonic filter. The control exhibits a good steady state performance and improves the dynamic response without any overshoot in the line current. Theoretical principles of the proposed method are discussed. Both simulation and experimental results are presented to verify the performance and effectiveness of this control scheme.

Research paper thumbnail of A Comparative Study between DPC and DPC-SVM Controllers Using dSPACE (DS1104

The aim of this paper is to compare two different control structures. The Simple Direct Power Con... more The aim of this paper is to compare two different control structures. The Simple Direct Power Control (DPC) and the Direct Power Control with Space Vector Modulation (DPC-SVM) for two level converter applications. The first strategy (DPC) has been developed to control the instantaneous active and reactive power directly by selecting the optimum switching state of the converter. Applied to the Pulse Width Modulation (PWM) converter its main feature is to improve the total power factor and efficiency, even harmonics components existence. In the second structure, the active and reactive powers are used as (PWM) control variables instead of the three-phase line currents usually used in other techniques. It is shown that DPC-SVM exhibits several properties; good dynamic response, constant switching frequency, and in particular it provides a sinusoidal line currents. Simulation and experimental results has shown that both control structures achieve good performances.

Research paper thumbnail of Sensorless direct power regulation by sliding mode approach of DFIG generator based wind energy system

2015 IEEE 15th International Conference on Environment and Electrical Engineering (EEEIC), 2015

Research paper thumbnail of IRFOC vs DTC performance comparison analysis

2013 3rd International Conference on Electric Power and Energy Conversion Systems, 2013

ABSTRACT

Research paper thumbnail of A Comparative Study between DPC and DPC-SVM Controllers Using dSPACE (DS1104)

International Journal of Electrical and Computer Engineering (IJECE), 2014

Research paper thumbnail of Direct Active and Reactive Power Control of DFIG for Wind Energy Generation

IEEE Transactions on Energy Conversion, 2006

Abstract—This paper presents a new direct power control (DPC) strategy for a doubly fed induction... more Abstract—This paper presents a new direct power control (DPC) strategy for a doubly fed induction generator (DFIG)-based wind energy generation system. The strategy is based on the direct con-trol of stator active and reactive power by selecting appropriate voltage vectors on ...

Research paper thumbnail of PWM Converters and its Application to the Wind-energy Generation

Energy Procedia, 2013

ABSTRACT This paper proposes basic concepts of a fixed speed wind turbine (FSWT), as an introduct... more ABSTRACT This paper proposes basic concepts of a fixed speed wind turbine (FSWT), as an introduction to a modern wind turbine concept; also, energy extraction from the wind turbine, in order to highlight the utility of the Direct Torque Control (DTC) and Hysteresis Current Control (HCC) in the field of the quality of the electric power. The HCC will be applied to the grid side converter on the way to control the DC link voltage [1]. The Induction Generator (IG) wind turbine connected to the network using back-to-back PWM converters (AC/DC/AC). The theoretical principle of this method is discussed. From the simulation results, it is shown that DTC and HCC display several features, such as a simple algorithm and good dynamic response [2].

Research paper thumbnail of Two Vector Based Direct Power Control of AC/DC Grid Connected Converters Using a Constant Switching Frequency

Journal of Power Electronics, 2017

In this paper, an improved Direct Power Control (DPC) algorithm is presented for grid connected t... more In this paper, an improved Direct Power Control (DPC) algorithm is presented for grid connected three phase PWM rectifiers. The new DPC approach is based on two main tasks. First the optimization of the look-up table, which is well-known in conventional DPC, is outlined for selecting the optimum converter output voltage vectors. Secondly a very simple and effective method is used to directly calculate their duty cycles from the power errors. Therefore, the measured active and reactive powers are made to track their references using hysteresis controllers. Then two vectors are selected and applied during one control cycle to minimize both the active and reactive power ripples. The main advantages of this method are that there is no need of linear current controllers, coordinates transformations or modulators. In addition, the control strategy is able to operate at constant switching frequencies to ease the design of the power converter and the AC harmonic filter. The control exhibits a good steady state performance and improves the dynamic response without any overshoot in the line current. Theoretical principles of the proposed method are discussed. Both simulation and experimental results are presented to verify the performance and effectiveness of this control scheme.

Research paper thumbnail of A Comparative Study between DPC and DPC-SVM Controllers Using dSPACE (DS1104

The aim of this paper is to compare two different control structures. The Simple Direct Power Con... more The aim of this paper is to compare two different control structures. The Simple Direct Power Control (DPC) and the Direct Power Control with Space Vector Modulation (DPC-SVM) for two level converter applications. The first strategy (DPC) has been developed to control the instantaneous active and reactive power directly by selecting the optimum switching state of the converter. Applied to the Pulse Width Modulation (PWM) converter its main feature is to improve the total power factor and efficiency, even harmonics components existence. In the second structure, the active and reactive powers are used as (PWM) control variables instead of the three-phase line currents usually used in other techniques. It is shown that DPC-SVM exhibits several properties; good dynamic response, constant switching frequency, and in particular it provides a sinusoidal line currents. Simulation and experimental results has shown that both control structures achieve good performances.

Research paper thumbnail of Sensorless direct power regulation by sliding mode approach of DFIG generator based wind energy system

2015 IEEE 15th International Conference on Environment and Electrical Engineering (EEEIC), 2015

Research paper thumbnail of IRFOC vs DTC performance comparison analysis

2013 3rd International Conference on Electric Power and Energy Conversion Systems, 2013

ABSTRACT

Research paper thumbnail of A Comparative Study between DPC and DPC-SVM Controllers Using dSPACE (DS1104)

International Journal of Electrical and Computer Engineering (IJECE), 2014

Research paper thumbnail of Direct Active and Reactive Power Control of DFIG for Wind Energy Generation

IEEE Transactions on Energy Conversion, 2006

Abstract—This paper presents a new direct power control (DPC) strategy for a doubly fed induction... more Abstract—This paper presents a new direct power control (DPC) strategy for a doubly fed induction generator (DFIG)-based wind energy generation system. The strategy is based on the direct con-trol of stator active and reactive power by selecting appropriate voltage vectors on ...

Research paper thumbnail of PWM Converters and its Application to the Wind-energy Generation

Energy Procedia, 2013

ABSTRACT This paper proposes basic concepts of a fixed speed wind turbine (FSWT), as an introduct... more ABSTRACT This paper proposes basic concepts of a fixed speed wind turbine (FSWT), as an introduction to a modern wind turbine concept; also, energy extraction from the wind turbine, in order to highlight the utility of the Direct Torque Control (DTC) and Hysteresis Current Control (HCC) in the field of the quality of the electric power. The HCC will be applied to the grid side converter on the way to control the DC link voltage [1]. The Induction Generator (IG) wind turbine connected to the network using back-to-back PWM converters (AC/DC/AC). The theoretical principle of this method is discussed. From the simulation results, it is shown that DTC and HCC display several features, such as a simple algorithm and good dynamic response [2].

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