Mohamed Khafallah - Academia.edu (original) (raw)

Papers by Mohamed Khafallah

International Journal of Power Electronics and Drive Systems (IJPEDS), 2024

Conventional direct torque control (DTC) can be served to drive a dual three-phase permanent magn... more Conventional direct torque control (DTC) can be served to drive a dual three-phase permanent magnet synchronous motor (DTP-PMSM) by controlling the torque and speed. It relies on the direct application of controlled sequences through the use of a combination of dual hysteresis controllers with a transitioning table. In the course of conventional DTC implementation, there's generation of high armature current with lower-level harmonics, leading to increased losses that affect the machine's effectiveness. To enable a diminishment in these harmonics and consequently enhance the motor's efficiency, an approach to modify the conventional DTC is proposed. Specifically, this strategy involves adapting a new distribution of sectors and substituting the elements of the obtained switching table with synthetic elements. Simulated data validate the effectiveness of the chosen methodology.

Zenodo (CERN European Organization for Nuclear Research), Mar 9, 2023

Procedia Structural Integrity, 2018

During their operation, modern aircraft engine components are subjected to increasingly demanding... more During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data.

2016 International Conference on Electrical and Information Technologies (ICEIT), 2016

This paper presents a comparative study between two algorithms techniques which are Incremental C... more This paper presents a comparative study between two algorithms techniques which are Incremental Conductance and Perturb and Observe used to maximize the efficiency of the solar generator under variations of solar irradiation, temperature and electrical loads. Indeed, the Maximum Power Point Tracking algorithms are used to control a DC-DC boost converter to generate the Maximum Power Point of the generator photovoltaic. The computer simulation results, in Matlab/Simulink environment, presented in this paper show that the photovoltaic simulation system can track the maximum power point accurately using the two maximum power point tracking techniques.

2016 International Conference on Electrical and Information Technologies (ICEIT), 2016

The three level inverters (NPC), present a big interest in the field of the high voltages and the... more The three level inverters (NPC), present a big interest in the field of the high voltages and the high powers of the fact that they introduce less distortion and weak losses with relatively low switching frequency. This paper present a direct torque control of three level inverters fed induction machine. In order to provide better torque regulation and lower switching frequency, a simple switching strategy was presented using seven level torque hysteresis and two level flux hysteresis controllers to give more options in selecting an appropriate voltage vector. Simulation results have proven a good performance and verified the validity of this approach using Matlab/Simulink.

International Journal of Power Electronics and Drive Systems (IJPEDS), 2021

The study made in this paper concerns the use of the voltage-oriented control (VOC) of three-phas... more The study made in this paper concerns the use of the voltage-oriented control (VOC) of three-phase pulse width modulation (PWM) rectifier with constant switching frequency. This control method, called voltage-oriented control with space vector modulation (VOC-SVM). The proposed control scheme has been founded on the transformation between stationary (α-β) and and synchronously rotating (d-q) coordinate system, it is based on two cascaded control loops so that a fast inner loop controls the grid current and an external loop DC-link voltage, while the DC-bus voltage is maintained at the desired level and ansured the unity power factor operation. So, the stable state performance and robustness against the load’s disturbance of PWM rectifiers are boths improved. The proposed scheme has been implemented and simulated in MATLAB/Simulink environment. The control system of the VOC-SVM strategy has been built based on dSPACE system with DS1104 controller board. The results obtained show the validity of the model and its control method. Compared with the conventional SPWM method, the VOC-SVM ensures high performance and fast transient response.

—This work treats numerous limitations related to the charging station performance through the PV... more —This work treats numerous limitations related to the charging station performance through the PV array including the dc-dc boost converter feeding a lithium-ion battery, which is presented as a storage battery of the charging station. The aim is to specify the control strategy of the power flux in the system using multiple optimization methods such as the MPPT algorithm and the voltage control loop for the dc-dc converter. However, the integration of the grid in this platform is also considered indispensable to build an efficient electrical pattern contains all the specifications required for the electric vehicle charging station, the limited power delivered by the PV system is also recognized as an energy constraint in this approach. On the other hand, the battery technology and the appropriate algorithm of the energy management system are made an important improvement to decrease the impact of the inconvenient concerns., dc-dc converter, maximum power point tracking, battery storage bank, incremental conductance algorithm, voltage loop control.

This paper concerns with the modeling, simulation, and emulation of a wind turbine emulator for s... more This paper concerns with the modeling, simulation, and emulation of a wind turbine emulator for standalone wind energy conversion systems. By using emulation system, we aim to reproduce the dynamic behavior of the wind turbine torque on the generator shaft: it provides the testing facilities to optimize generator control strategies in a controlled environment, without reliance on natural resources. The aerodynamic, mechanical, electrical models have been detailed as well as the control of pitch angle using Fuzzy Logic for horizontal axis wind turbines. The wind turbine emulator consists mainly of an induction motor with AC power drive with torque control. The control of the induction motor and the mathematical models of the wind turbine are designed with MATLAB/Simulink environment. The simulation results confirm the effectiveness of the induction motor control system and the functionality of the wind turbine emulator for providing all necessary parameters of the wind turbine system...

This work presents an improved strategy of control for charging a lithium-ion battery in an elect... more This work presents an improved strategy of control for charging a lithium-ion battery in an electric vehicle charging station using two charger topologies i.e. single ended primary inductor converter (SEPIC) and forward converter. In terms of rapidity and accuracy, the power system consists of a topology/control diagram that would overcome the performance constraints, for instance the power instability, the battery overloading and how the energy conversion blocks would react efficiently to any kind of perturbations. Simulation results show the effectiveness of the proposed topologies operated with a power management algorithm based on voltage/peak current mode controls. In order to provide credible findings, a low power prototype is developed to test the control strategy via experimental evaluations of the converter topology and its controls.

2017 International Conference on Electrical and Information Technologies (ICEIT), 2017

This work focuses on a smart algorithm to optimize energy of electric vehicles charging station w... more This work focuses on a smart algorithm to optimize energy of electric vehicles charging station while considering numerous constraints as the instability of renewable energy sources and the potential limited power given by the grid. The PV array is considered as a basic source of energy to feed the charging station system, directly tied into a voltage DC bus, thus the lithium-ion battery is implemented in this platform to complete the power flow of each potential charging scenario. Moreover, the management algorithm is taking into account the fluctuant power state of both the DC and the AC bus link, and it treats also the state of charge of the batteries in the energy management approach.

2017 14th International Multi-Conference on Systems, Signals & Devices (SSD), 2017

This paper presents a modeling and simulation, in Matlab/Simulink environment, of a stand-alone s... more This paper presents a modeling and simulation, in Matlab/Simulink environment, of a stand-alone solar PV system in order to analyse its performance under irradiation and load variations. Indeed, to supply an alternative load with a sinusoidal line without harmonic distortion under weather conditions, a MPPT (Maximum Power Point Tracking) algorithm has used to control a DC-DC boost converter to generate the MPP (Maximum Power Point) of the photovoltaic generator to alternative load via a PWM (Pulse Width Modulation) three phase inverter. The computer simulation results presented in this paper, developed in MATLAB/Simulink environment, validate the full PV system components.

EPE Journal, 2005

In this paper, the concept and analysis of a simple direct-torque fuzzy control (DTFC) scheme of ... more In this paper, the concept and analysis of a simple direct-torque fuzzy control (DTFC) scheme of motor induction using space vector modulation (SVM) is presented. A fuzzy logic control system is applied to obtain high performance decoupled flux and torque control. A principle and a tuning procedure of this method are discussed. The simulation results, that prove the performance of the proposed scheme as an alternative to the conventional approach, and a consideration for implementation on a DSP development system of proposed scheme, are presented.

This paper presents a Fuzzy Proportional Integral (PI) controller used to maximize the power tran... more This paper presents a Fuzzy Proportional Integral (PI) controller used to maximize the power transfer of a standalone Wind Energy Conversion Sys-tem (WECS). The Fuzzy-PI controller, applied to WECS for MPPT, improves well the system performance in comparison with the classical PI controller. Indeed, this proposed controller allows to obtain a good responses by adjusting the Permanent Magnet Synchronous Generator's (PMSG) rotor speed under variation of the wind speed. The computer simulation results, in Matlab/Simulink environment, presented in this paper, show the effectiveness and the good performances of the proposed designed system.

This paper treats direct power control (DPC) for three-phase PWM rectifiers using a new switching... more This paper treats direct power control (DPC) for three-phase PWM rectifiers using a new switching table, without line voltage sensors and the fuzzy logic theory. The instantaneous active and reactive powers, directly controlled by selecting the optimum state of the converter, are used as the PWM control variables instead of the phase line currents being used. These strategies are used to eliminate harmonics currents and consequently to reduce total harmonic distortion (THD) of the line current and improve the power factor with maintain the dc-bus voltage at the required level. Conventional PI and a designed fuzzy logic-based controller, in the dc-bus voltage control loop, have been used to provide active power command. A digital simulation, in Matlab/simulink, was carried. The steady-state and dynamic results illustrating the operation and performance of the proposed control scheme are presented. As a result, it was confirmed that the novel DPC is much better than the classical one....

International Journal of Power Electronics and Drive Systems (IJPEDS), 2021

The study made in this paper concerns the use of the voltage-oriented control (VOC) of three-phas... more The study made in this paper concerns the use of the voltage-oriented control (VOC) of three-phase pulse width modulation (PWM) rectifier with constant switching frequency. This control method, called voltage-oriented controlwith space vector modulation (VOC-SVM). The proposed control scheme has been founded on the transformation between stationary (α-β) and and synchronously rotating (d-q) coordinate system, it is based on two cascaded control loops so that a fast inner loop controls the grid current and an external loop DC-link voltage, while the DC-bus voltage is maintained at the desired level and ansured the unity power factor operation. So, the stable state performance and robustness against the load’s disturbance of PWM rectifiers are boths improved. The proposed scheme has been implemented and simulated in MATLAB/Simulink environment. The control system of the VOC-SVM strategy has been built based on dSPACE system with DS1104 controller board. The results obtained show the v...

2017 International Conference on Electrical and Information Technologies (ICEIT), 2017

This paper presents a comparative study between two different controls strategies of unit power f... more This paper presents a comparative study between two different controls strategies of unit power factor rectifier: hysteresis current control and voltage oriented control (VOC), in order to obtain high performance DC bus voltage, lower input current harmonics and higher power factor. The studied control strategies presented in this paper are developed in MATLAB/Simulink environment and implemented in software of the DS1104 board. The simulation and experimental results demonstrate well the performance of the PWM rectifier control techniques.

2018 19th IEEE Mediterranean Electrotechnical Conference (MELECON), 2018

In order to provide a reduction of harmonic current for Dual Three-Phase Permanent Magnet Synchro... more In order to provide a reduction of harmonic current for Dual Three-Phase Permanent Magnet Synchronous Motor (DTP-PMSM), this paper proposes a Space Vector Pulse Width Modulation (SVPWM) technique based on vector space decomposition method (VSD). By this technique, the analysis and control of the machine are accomplished in three two-dimensional orthogonal subspaces. Among the 12 voltage vectors having maximum magnitude, the Successive Four-Vectors method (S4V) is chosen instead of the Adjacent Two-Vectors method (A2V). Thereby, the principle of reference voltage vector selection and the method of time calculation are discussed. The validity and the efficiency of the selected method are confirmed by simulation results.

2019 7th International Renewable and Sustainable Energy Conference (IRSEC), 2019

The objective of this paper is to perform the comparative study between two control strategies ba... more The objective of this paper is to perform the comparative study between two control strategies based on Vector Space Decomposition (VSD) method for Dual Three Phase Permanent Magnet Synchronous Motors (DTP-PMSM), applied on electric ship propulsion, namely Space Vector Pulse Width Modulation using 12-Sector (12-sector PWM) and Space Vector Pulse Width Modulation using 24-Sector (24-sector PWM). These two techniques can be considered among the family of Vector Control (VC) methods and provide a solution for highperformance drives, reduction in electromagnetic torque as well as diminishing the extra stator current harmonics. Advantages and drawbacks of both methods are discussed and different simulation tests are performed to illustrate the features of both methods. The criteria followed to establish a just comparison between both of the control approaches is also presented. The dynamic model and control of the motor are accomplished in three two-dimensional orthogonal subspaces. The simulations' results, in Matlab/Simulink environment, validate well the performance of these two control strategies.

2019 International Conference of Computer Science and Renewable Energies (ICCSRE), 2019

This paper relates to the works on the control and the identification of multiphase motors flux a... more This paper relates to the works on the control and the identification of multiphase motors flux applied on electric ship propulsion. It describes a vector control namely the Field Oriented Control (FOC) strategy using Four-Vector 24-Sector Modulation (FV24SM) based on VSD method (Vector Space Decomposition). This technique consists of orienting flux components for Dual Three-Phase Permanent Magnet Synchronous Motor (DTP-PMSM) ship supplied by two identical and independently Voltage Source Inverter (VSI) connected by two DC sources. The dynamic model and the motor’s control are carried out in three subspaces that are both two-dimensional and orthogonal. The key of the proposed strategy is to reduce more the extra stator harmonic current components on (z1, z2) subspace, namely the harmonic-component subspace, that produces losses. Thereby, the reference voltage vector selection principle and the time calculation method are presented. The validity and the efficiency of the adopted strategy are illustrated by simulation results.

Engineering, Technology & Applied Science Research, 2018

This paper presents the design and the implementation of a low-cost single phase five-level inver... more This paper presents the design and the implementation of a low-cost single phase five-level inverter for photovoltaic applications. The proposed multilevel inverter is composed of a simple boost converter, a switched-capacitor converter, and an H-bridge converter. An efficient control method which associates a closed-loop regulation method with a simple maximum power point tracking (MPPT) method is applied in order to allow the proposed multilevel inverter to transfer power energy from solar panels to autonomous load with no storage batteries. An experimental prototype of this inverter is fabricated at the laboratory and tested with a digital control system. Obtained results confirm the simplicity and the performance of the proposed photovoltaic system.

International Journal of Power Electronics and Drive Systems (IJPEDS), 2024

Conventional direct torque control (DTC) can be served to drive a dual three-phase permanent magn... more Conventional direct torque control (DTC) can be served to drive a dual three-phase permanent magnet synchronous motor (DTP-PMSM) by controlling the torque and speed. It relies on the direct application of controlled sequences through the use of a combination of dual hysteresis controllers with a transitioning table. In the course of conventional DTC implementation, there's generation of high armature current with lower-level harmonics, leading to increased losses that affect the machine's effectiveness. To enable a diminishment in these harmonics and consequently enhance the motor's efficiency, an approach to modify the conventional DTC is proposed. Specifically, this strategy involves adapting a new distribution of sectors and substituting the elements of the obtained switching table with synthetic elements. Simulated data validate the effectiveness of the chosen methodology.

Zenodo (CERN European Organization for Nuclear Research), Mar 9, 2023

Procedia Structural Integrity, 2018

During their operation, modern aircraft engine components are subjected to increasingly demanding... more During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data.

2016 International Conference on Electrical and Information Technologies (ICEIT), 2016

This paper presents a comparative study between two algorithms techniques which are Incremental C... more This paper presents a comparative study between two algorithms techniques which are Incremental Conductance and Perturb and Observe used to maximize the efficiency of the solar generator under variations of solar irradiation, temperature and electrical loads. Indeed, the Maximum Power Point Tracking algorithms are used to control a DC-DC boost converter to generate the Maximum Power Point of the generator photovoltaic. The computer simulation results, in Matlab/Simulink environment, presented in this paper show that the photovoltaic simulation system can track the maximum power point accurately using the two maximum power point tracking techniques.

2016 International Conference on Electrical and Information Technologies (ICEIT), 2016

The three level inverters (NPC), present a big interest in the field of the high voltages and the... more The three level inverters (NPC), present a big interest in the field of the high voltages and the high powers of the fact that they introduce less distortion and weak losses with relatively low switching frequency. This paper present a direct torque control of three level inverters fed induction machine. In order to provide better torque regulation and lower switching frequency, a simple switching strategy was presented using seven level torque hysteresis and two level flux hysteresis controllers to give more options in selecting an appropriate voltage vector. Simulation results have proven a good performance and verified the validity of this approach using Matlab/Simulink.

International Journal of Power Electronics and Drive Systems (IJPEDS), 2021

The study made in this paper concerns the use of the voltage-oriented control (VOC) of three-phas... more The study made in this paper concerns the use of the voltage-oriented control (VOC) of three-phase pulse width modulation (PWM) rectifier with constant switching frequency. This control method, called voltage-oriented control with space vector modulation (VOC-SVM). The proposed control scheme has been founded on the transformation between stationary (α-β) and and synchronously rotating (d-q) coordinate system, it is based on two cascaded control loops so that a fast inner loop controls the grid current and an external loop DC-link voltage, while the DC-bus voltage is maintained at the desired level and ansured the unity power factor operation. So, the stable state performance and robustness against the load’s disturbance of PWM rectifiers are boths improved. The proposed scheme has been implemented and simulated in MATLAB/Simulink environment. The control system of the VOC-SVM strategy has been built based on dSPACE system with DS1104 controller board. The results obtained show the validity of the model and its control method. Compared with the conventional SPWM method, the VOC-SVM ensures high performance and fast transient response.

—This work treats numerous limitations related to the charging station performance through the PV... more —This work treats numerous limitations related to the charging station performance through the PV array including the dc-dc boost converter feeding a lithium-ion battery, which is presented as a storage battery of the charging station. The aim is to specify the control strategy of the power flux in the system using multiple optimization methods such as the MPPT algorithm and the voltage control loop for the dc-dc converter. However, the integration of the grid in this platform is also considered indispensable to build an efficient electrical pattern contains all the specifications required for the electric vehicle charging station, the limited power delivered by the PV system is also recognized as an energy constraint in this approach. On the other hand, the battery technology and the appropriate algorithm of the energy management system are made an important improvement to decrease the impact of the inconvenient concerns., dc-dc converter, maximum power point tracking, battery storage bank, incremental conductance algorithm, voltage loop control.

This paper concerns with the modeling, simulation, and emulation of a wind turbine emulator for s... more This paper concerns with the modeling, simulation, and emulation of a wind turbine emulator for standalone wind energy conversion systems. By using emulation system, we aim to reproduce the dynamic behavior of the wind turbine torque on the generator shaft: it provides the testing facilities to optimize generator control strategies in a controlled environment, without reliance on natural resources. The aerodynamic, mechanical, electrical models have been detailed as well as the control of pitch angle using Fuzzy Logic for horizontal axis wind turbines. The wind turbine emulator consists mainly of an induction motor with AC power drive with torque control. The control of the induction motor and the mathematical models of the wind turbine are designed with MATLAB/Simulink environment. The simulation results confirm the effectiveness of the induction motor control system and the functionality of the wind turbine emulator for providing all necessary parameters of the wind turbine system...

This work presents an improved strategy of control for charging a lithium-ion battery in an elect... more This work presents an improved strategy of control for charging a lithium-ion battery in an electric vehicle charging station using two charger topologies i.e. single ended primary inductor converter (SEPIC) and forward converter. In terms of rapidity and accuracy, the power system consists of a topology/control diagram that would overcome the performance constraints, for instance the power instability, the battery overloading and how the energy conversion blocks would react efficiently to any kind of perturbations. Simulation results show the effectiveness of the proposed topologies operated with a power management algorithm based on voltage/peak current mode controls. In order to provide credible findings, a low power prototype is developed to test the control strategy via experimental evaluations of the converter topology and its controls.

2017 International Conference on Electrical and Information Technologies (ICEIT), 2017

This work focuses on a smart algorithm to optimize energy of electric vehicles charging station w... more This work focuses on a smart algorithm to optimize energy of electric vehicles charging station while considering numerous constraints as the instability of renewable energy sources and the potential limited power given by the grid. The PV array is considered as a basic source of energy to feed the charging station system, directly tied into a voltage DC bus, thus the lithium-ion battery is implemented in this platform to complete the power flow of each potential charging scenario. Moreover, the management algorithm is taking into account the fluctuant power state of both the DC and the AC bus link, and it treats also the state of charge of the batteries in the energy management approach.

2017 14th International Multi-Conference on Systems, Signals & Devices (SSD), 2017

This paper presents a modeling and simulation, in Matlab/Simulink environment, of a stand-alone s... more This paper presents a modeling and simulation, in Matlab/Simulink environment, of a stand-alone solar PV system in order to analyse its performance under irradiation and load variations. Indeed, to supply an alternative load with a sinusoidal line without harmonic distortion under weather conditions, a MPPT (Maximum Power Point Tracking) algorithm has used to control a DC-DC boost converter to generate the MPP (Maximum Power Point) of the photovoltaic generator to alternative load via a PWM (Pulse Width Modulation) three phase inverter. The computer simulation results presented in this paper, developed in MATLAB/Simulink environment, validate the full PV system components.

EPE Journal, 2005

In this paper, the concept and analysis of a simple direct-torque fuzzy control (DTFC) scheme of ... more In this paper, the concept and analysis of a simple direct-torque fuzzy control (DTFC) scheme of motor induction using space vector modulation (SVM) is presented. A fuzzy logic control system is applied to obtain high performance decoupled flux and torque control. A principle and a tuning procedure of this method are discussed. The simulation results, that prove the performance of the proposed scheme as an alternative to the conventional approach, and a consideration for implementation on a DSP development system of proposed scheme, are presented.

This paper presents a Fuzzy Proportional Integral (PI) controller used to maximize the power tran... more This paper presents a Fuzzy Proportional Integral (PI) controller used to maximize the power transfer of a standalone Wind Energy Conversion Sys-tem (WECS). The Fuzzy-PI controller, applied to WECS for MPPT, improves well the system performance in comparison with the classical PI controller. Indeed, this proposed controller allows to obtain a good responses by adjusting the Permanent Magnet Synchronous Generator's (PMSG) rotor speed under variation of the wind speed. The computer simulation results, in Matlab/Simulink environment, presented in this paper, show the effectiveness and the good performances of the proposed designed system.

This paper treats direct power control (DPC) for three-phase PWM rectifiers using a new switching... more This paper treats direct power control (DPC) for three-phase PWM rectifiers using a new switching table, without line voltage sensors and the fuzzy logic theory. The instantaneous active and reactive powers, directly controlled by selecting the optimum state of the converter, are used as the PWM control variables instead of the phase line currents being used. These strategies are used to eliminate harmonics currents and consequently to reduce total harmonic distortion (THD) of the line current and improve the power factor with maintain the dc-bus voltage at the required level. Conventional PI and a designed fuzzy logic-based controller, in the dc-bus voltage control loop, have been used to provide active power command. A digital simulation, in Matlab/simulink, was carried. The steady-state and dynamic results illustrating the operation and performance of the proposed control scheme are presented. As a result, it was confirmed that the novel DPC is much better than the classical one....

International Journal of Power Electronics and Drive Systems (IJPEDS), 2021

The study made in this paper concerns the use of the voltage-oriented control (VOC) of three-phas... more The study made in this paper concerns the use of the voltage-oriented control (VOC) of three-phase pulse width modulation (PWM) rectifier with constant switching frequency. This control method, called voltage-oriented controlwith space vector modulation (VOC-SVM). The proposed control scheme has been founded on the transformation between stationary (α-β) and and synchronously rotating (d-q) coordinate system, it is based on two cascaded control loops so that a fast inner loop controls the grid current and an external loop DC-link voltage, while the DC-bus voltage is maintained at the desired level and ansured the unity power factor operation. So, the stable state performance and robustness against the load’s disturbance of PWM rectifiers are boths improved. The proposed scheme has been implemented and simulated in MATLAB/Simulink environment. The control system of the VOC-SVM strategy has been built based on dSPACE system with DS1104 controller board. The results obtained show the v...

2017 International Conference on Electrical and Information Technologies (ICEIT), 2017

This paper presents a comparative study between two different controls strategies of unit power f... more This paper presents a comparative study between two different controls strategies of unit power factor rectifier: hysteresis current control and voltage oriented control (VOC), in order to obtain high performance DC bus voltage, lower input current harmonics and higher power factor. The studied control strategies presented in this paper are developed in MATLAB/Simulink environment and implemented in software of the DS1104 board. The simulation and experimental results demonstrate well the performance of the PWM rectifier control techniques.

2018 19th IEEE Mediterranean Electrotechnical Conference (MELECON), 2018

In order to provide a reduction of harmonic current for Dual Three-Phase Permanent Magnet Synchro... more In order to provide a reduction of harmonic current for Dual Three-Phase Permanent Magnet Synchronous Motor (DTP-PMSM), this paper proposes a Space Vector Pulse Width Modulation (SVPWM) technique based on vector space decomposition method (VSD). By this technique, the analysis and control of the machine are accomplished in three two-dimensional orthogonal subspaces. Among the 12 voltage vectors having maximum magnitude, the Successive Four-Vectors method (S4V) is chosen instead of the Adjacent Two-Vectors method (A2V). Thereby, the principle of reference voltage vector selection and the method of time calculation are discussed. The validity and the efficiency of the selected method are confirmed by simulation results.

2019 7th International Renewable and Sustainable Energy Conference (IRSEC), 2019

The objective of this paper is to perform the comparative study between two control strategies ba... more The objective of this paper is to perform the comparative study between two control strategies based on Vector Space Decomposition (VSD) method for Dual Three Phase Permanent Magnet Synchronous Motors (DTP-PMSM), applied on electric ship propulsion, namely Space Vector Pulse Width Modulation using 12-Sector (12-sector PWM) and Space Vector Pulse Width Modulation using 24-Sector (24-sector PWM). These two techniques can be considered among the family of Vector Control (VC) methods and provide a solution for highperformance drives, reduction in electromagnetic torque as well as diminishing the extra stator current harmonics. Advantages and drawbacks of both methods are discussed and different simulation tests are performed to illustrate the features of both methods. The criteria followed to establish a just comparison between both of the control approaches is also presented. The dynamic model and control of the motor are accomplished in three two-dimensional orthogonal subspaces. The simulations' results, in Matlab/Simulink environment, validate well the performance of these two control strategies.

2019 International Conference of Computer Science and Renewable Energies (ICCSRE), 2019

This paper relates to the works on the control and the identification of multiphase motors flux a... more This paper relates to the works on the control and the identification of multiphase motors flux applied on electric ship propulsion. It describes a vector control namely the Field Oriented Control (FOC) strategy using Four-Vector 24-Sector Modulation (FV24SM) based on VSD method (Vector Space Decomposition). This technique consists of orienting flux components for Dual Three-Phase Permanent Magnet Synchronous Motor (DTP-PMSM) ship supplied by two identical and independently Voltage Source Inverter (VSI) connected by two DC sources. The dynamic model and the motor’s control are carried out in three subspaces that are both two-dimensional and orthogonal. The key of the proposed strategy is to reduce more the extra stator harmonic current components on (z1, z2) subspace, namely the harmonic-component subspace, that produces losses. Thereby, the reference voltage vector selection principle and the time calculation method are presented. The validity and the efficiency of the adopted strategy are illustrated by simulation results.

Engineering, Technology & Applied Science Research, 2018

This paper presents the design and the implementation of a low-cost single phase five-level inver... more This paper presents the design and the implementation of a low-cost single phase five-level inverter for photovoltaic applications. The proposed multilevel inverter is composed of a simple boost converter, a switched-capacitor converter, and an H-bridge converter. An efficient control method which associates a closed-loop regulation method with a simple maximum power point tracking (MPPT) method is applied in order to allow the proposed multilevel inverter to transfer power energy from solar panels to autonomous load with no storage batteries. An experimental prototype of this inverter is fabricated at the laboratory and tested with a digital control system. Obtained results confirm the simplicity and the performance of the proposed photovoltaic system.