M. BARKAT Said

Prof

Directory of teachers

Department

DEPARTEMENT OF: ELECTRICAL ENGINEERING

Research Interests

Specialized in DEPARTEMENT OF: ELECTRICAL ENGINEERING. Focused on academic and scientific development.

Contact Info

University of M'Sila, Algeria

Email : said.barkat@univ-msila.dz

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Recent Publications

2024-07-19

Real-Time Implementation of a New Modified 3DSVPWM Control Method for Eliminating Zero-Sequence Circulating Current in Parallel Three-Phase Four-Leg Source Voltage Inverters

Due to its good reliability, high modularity, zero-sequence current (ZSC) path, and lower size and cost, the parallel four-leg source voltage inverter’s topology is a perfect choice for many power
applications, including renewable power generation-based stand-alone power-supply systems (SAPSSs). However, the major concern associated with this topology is the presence of a zero-sequence circulating
current (ZSCC) that circulates between the phase legs of these inverters when the inverters operate under unbalanced current sharing or unbalanced output-filter parameters, which leads to multiple consequences,
including output current distortion, power losses, and system stability degradation, as well as impacting the efficiency, reliability, and operational lifespan of the system. The ZSCC model demonstrates that the
ZSCC amplitude is linked to the filter inductance and difference between zero-sequence duty ratios or zero-sequence voltages (ZSVs). Considering these facts, we propose a new modified three-dimensional
space vector pulse width modulation (3DSVPWM) methodology to suppress ZSCC and its effects on the current quality, efficiency, reliability, and operational lifespan of the parallel system. The suggested strategy
aims to eliminate the difference between ZSVs by adjusting the zero-vector duty ratios in each switching period. This adjustment keeps the ZSCC constant at zero with minimal oscillations and switching losses,
thereby improving the output current quality, particularly in mitigating the 3rd harmonic and its multiples, and enhancing the system’s efficiency, reliability, and operational lifespan. The proposed method offers the
advantages of being suitable for suppressing both the ZSCC and ZSC and not impacting the control purposes or the system’s output quality. The efficiency and performance of the designed method are validated through various Hardware-in-the-loop (HIL) tests under different conditions using the OPAL-RT-OP5700 real-time simulator.
Citation

M. BARKAT Said, Djamal Ziane, Syphax Ihammouchen, Toufik Rekioua, Habib Benbouhenni, Ayman Alhejji, , (2024-07-19), "Real-Time Implementation of a New Modified 3DSVPWM Control Method for Eliminating Zero-Sequence Circulating Current in Parallel Three-Phase Four-Leg Source Voltage Inverters", [national] IEEE Access , IEEE

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2024-05-24

Circulating currents control method for paralleled three-level NPC inverters

Parallel multilevel inverter becoming a very attractive structure for medium- and high-power/voltage applications. This is mainly due to the fact that it can achieve high-power level and overcome voltage /current limitations of switching devices. However due to the differences in hardware parameters, the circulating current appears in this structure and degrades its performance. This paper presents a circulating current control method for paralleled three-level neutral point clamped (NPC) inverter. The analytical model that describes the circulating current generation and behaviors is demonstrated, and then using this model, a control method to eliminate the circulating current is proposed. The proposed strategy is realized by introducing a control variable adjusting the application times of the redundant vectors of the three-level space vector modulation (SVPWM). In addition, a PI-controller based on closed loop control is synthetized to determine automatically the appropriate adjustable duration, during which the redundant vectors will be applied to eliminate the circulating current among the paralleled inverter. Finally, the effectiveness of the proposed circulating current control method under different operating conditions is confirmed through experimental validation.
Citation

M. BARKAT Said, Abdelhamid Rabhi, Mohammed Belkheiri, , (2024-05-24), "Circulating currents control method for paralleled three-level NPC inverters", [national] Electrical Engineering , Springer Nature

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2023-04-01

PROPORTIONAL INTEGRAL QUASI RESONANT CONTROLLER FOR ZERO-SEQUENCE CIRCULATING CURRENT AND RIPPLES SUPPRESSION IN PARALLEL THREE-PHASE PWM RECTIFIERS

Parallel three-phase pulse with modulation (PWM) rectifiers with common sc and ac buses are widely used in power systems due to their many advantages such as flexibility, sinusoidal grid currents, lower switching frequency, and good reliability. However, this topology suffers from zero-sequence circulating current (ZSCC) generated by numerous reasons including filters inductors unbalanced, unequal dead time, and losses of synchronism between the control of each rectifier, which will distort the ac-side currents and increase power losses. This paper proposes both an adjusted space vector pulse width modulated (ASVPWM) method and proportional integral quasi resonant controller (PIQRC) method not only to force the ZSCC to be zero but also to reduce its ripples, which results in low frequency harmonic components in the ac side currents. This twofold objective can be achieved by adjusting the zero-vector duty ratios of ASVPWM to suppress the ZSCC and by using PIQRC to mitigate its predominant harmonics. Finally, the superiority and efficiency of the proposed control method in terms of ZSCC suppression and current ripple reduction are verified through comparative analysis with the conventional ZSCC-PI controller.
Citation

M. BARKAT Said, MOHAMMED KARIM FELLAH, , (2023-04-01), "PROPORTIONAL INTEGRAL QUASI RESONANT CONTROLLER FOR ZERO-SEQUENCE CIRCULATING CURRENT AND RIPPLES SUPPRESSION IN PARALLEL THREE-PHASE PWM RECTIFIERS", [national] Revue Roumaine des Sciences Techniques - Serie Électrotechnique et Énergétique , ACADEMIEI ROMANE

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2023-03-29

Combined voltage oriented control and direct power control based on backstepping control for four-leg PWM rectifier under unbalanced conditions

The present paper proposes a combined voltage-oriented control and direct power control (VOC-DPC) method associated with the backstepping control technique for a three-phase four-wire grid-connected four-leg rectifier in the synchronous rotating frame without using phase locked loop (PLL) and Parks transformation under balanced and unbalanced load and grid conditions. This control method is proposed in order to remove the drawbacks of the conventional VOC based on the PLL technique .The proposed control method is able to enhance the control performance and dynamic responses of the system when considering slow dynamics and instability issues of the PLL in several cases and can decrease the computational burden due to the absence of PLL and Park transformation. In addition, the performance of the proposed VOC-DPC method is enhanced by using backstepping control (BSC) based on Lyabonov theory for both the input currents and DC-bus voltage loops. As a consequence, constant DC-bus voltage, unit power factor, sinusoidal input currents, and neutral current minimization can be accurately carried out under both DC-bus voltage and load variations. Furthermore, robustness against filter inductance variations can also be achieved. The effectiveness, superiority, and performance of the proposed control method for a four-leg rectifier based on BSC in the dq0-frame are validated by several processor-in-the-loop (PIL) co-simulation tests sing the STM32F407 discovery development board.
Citation

M. BARKAT Said, Abdelhalim Kessal, , (2023-03-29), "Combined voltage oriented control and direct power control based on backstepping control for four-leg PWM rectifier under unbalanced conditions", [national] Engineering Review , Faculty of Engineering/Faculty of Civil Engineering, University of Rijeka

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2023-03-01

Backstepping control of a grid-connected four-leg PWM rectifier under both balanced and unbalanced grid conditions

This study focuses on a backstepping control (BSC) of a three-phase four-leg pulse width modulation (PWM) rectifier under balanced and unbalanced load and grid conditions. The proposed BSC for the three-phase four-leg PWM rectifier (3P-4LR) connected to the grid is build up using three independent backstepping controllers based on Lyabonov theory to control simultaneously DC voltage and input currents. As a result, unit power factor, stable DC-bus voltage, sinusoidal input 3P-4LR currents with a lower harmonic content and lower zero-sequence and natural currents can be accurately achieved. Not only that, robustness against voltage grid fluctuations, load and filter inductance variations can also be carried out. The effectiveness, superiority, good dynamic, and steady-state performances of the proposed BSC based 3P-4LR have been validated by numerical simulations compared to the conventional proportional-integral control under balanced and unbalanced load and grid conditions.
Citation

M. BARKAT Said, Fouad Zebiri, , (2023-03-01), "Backstepping control of a grid-connected four-leg PWM rectifier under both balanced and unbalanced grid conditions", [national] International Journal of System Assurance Engineering and Management , Springer

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2022

Modified Carrier-Based SPWM Technique for Zero Sequence Circulating Current Elimination in Parallel Four-Leg Inverters

For medium and high-power renewable energy applications, parallel four-leg inverters are highly recommended to increase the power capability, power rating, and the efficiency of the system. However, a zero-sequence circulating current (ZSCC) will be generated by the difference between the zero sequence voltages (ZSVs) due to unequal output currents and filters inductors, as well as other factors such as different switching frequencies and dead times when the inverters are connected in parallel via common DC and AC buses. The ZSCC will seriously distort the output currents and degrade the control performance and the dynamic response of the overall parallel system. This paper proposes a modified carrier-based SPWM to eliminate the ZSCC by eliminating the difference between ZSVs through the adjustment of modulation voltages of the modified carrier-based SPWM. The proposed ZSCC suppression method can successfully achieve the ZSCC suppression even when the parallel four-leg inverters system has unbalanced output current sharing and filters inductances. The simulation results based on the parallel four-leg inverters distinctly confirm the effectiveness of the proposed ZSCC suppression method.
Citation

M. BARKAT Said, Chouder Adel, , (2022), "Modified Carrier-Based SPWM Technique for Zero Sequence Circulating Current Elimination in Parallel Four-Leg Inverters", [international] International Conference on Advanced Technology in Electronic and Electrical Engineering (ICATEEE’2022) , M’sila, Algeria , M'sila, Algeria

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2019

New modeling approach of secondary control layer for autonomous single-phase microgrids

In a microgrid (MG) topology, the secondary control is introduced to compensate for the voltage amplitude and frequency deviations, mainly caused by the inherent characteristics of the droop control strategy. This paper proposes an accurate approach to derive small signal models of the frequency and amplitude voltage at the point of common coupling (PCC) of a single-phase MG by analyzing the dynamics of the second-order generalized integrator-based frequency-locked loop (SOGI-FLL). The frequency estimate model is then introduced in the frequency restoration control loop, while the derived model of the amplitude estimate is introduced for the voltage restoration loop. Based on the obtained models, the MG stability analysis and proposed controllers’ parameters tuning are carried out. Also, this study includes the modeling and design of the synchronization control loop that enables a seamless transition from island mode to grid-connected mode operation. Simulation and practical experiments of a hierarchical control scheme, including traditional droop control and the proposed secondary control for two single-phase parallel inverters, are implemented to confirm the effectiveness and the robustness of the proposal under different operating conditions. The obtained results validate the proposed modeling approach to provide the expected transient response and disturbance rejection in the MG.
Citation

M. BARKAT Said, Ahmed Bendib, Kamel Kara, Abdelhammid Kherbachi, Walid Issa, , (2019), "New modeling approach of secondary control layer for autonomous single-phase microgrids", [national] Journal of the Franklin Institute , Elsevier

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2018

Sliding Mode Control and Modified SVM for Suppressing Circulating Currents in Parallel-Connected Inverters

Parallel operation of multi-inverters is an effective way to increase the power capacity and the reliability of power electronic systems. However, in parallel inverter operation, one of the most crucial problems is the zero-sequence circulating current (ZSCC). The ZSCC flows between parallel inverters, which results in current distortion, harmonic loss, unbalanced load sharing, and a decline in the overall system performance. In this paper, a sliding mode ZSCC controller for paralleled three-phase inverters is proposed. The suggested controller takes advantage of zero-vector redundancies to adjust their dwell time and cancel any voltage difference that can generate ZSCC between the paralleled inverters. The appropriate adjustment quantity is determined using a sliding mode controller, and as a result, a better ZSCC cancelation can be achieved at different operation conditions. Experimental results of two parallel inverters show the feasibility of the proposed ZSCC elimination method.
Citation

M. BARKAT Said, Mohammed Belkheiri, Abdelhamid Rabhi, Frede Blaabjerg, , (2018), "Sliding Mode Control and Modified SVM for Suppressing Circulating Currents in Parallel-Connected Inverters", [international] Electric Power Components and Systems , Taylor and Francis Online

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2016

Control of grid connected photovoltaic system using three-level t-type Inverter

Three-level T-Type inverter (3LT2I) topology has
numerous advantageous compared to three-level neutral-pointclamped (NPC) inverter. The main benefits of 3LT2I inverter are
the efficiency, inverter cost, switching losses, and the quality of
output voltage waveforms. In this paper, a photovoltaic
distributed generation system based on dual-stage topology of
DC-DC boost converter and 3LT2I is introduced. To that end, a
decoupling control strategy of 3LT2I is proposed to control the
current injected into the grid, reactive power compensation, and
DC-link voltage. The resulting system is able to extract the
maximum power from photovoltaic generator, to achieve
sinusoidal grid currents, and to ensure reactive power
compensation. The voltage-balancing control of two split DC
capacitors of the 3LT2I is achieved using three-level space vector
modulation with balancing strategy based on the effective use of
the redundant switching states of the inverter voltage vectors.
The proposed system performance is investigated at different
operating conditions.
Citation

M. BARKAT Said, Mohammed Belkheiri, Abdelhamid Rabhi, , (2016), "Control of grid connected photovoltaic system using three-level t-type Inverter", [international] 4th International conference on renewable energy: generation and applications , Belfort, France

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Control of Grid Connected Photovoltaic System Using Three-Level T-Type Inverter

Three-level T-Type inverter (3LT2I) topology has numerous advantageous compared to three-level neutral-point-clamped (NPC) inverter. The main benefits of 3LT2I inverter are the efficiency, inverter cost, switching losses, and the quality of output voltage waveforms. In this paper, a photovoltaic distributed generation system based on dual-stage topology of DC-DC boost converter and 3LT2I is introduced. To that end, a decoupling control strategy of 3LT2I is proposed to control the current injected into the grid, reactive power compensation, and DC-link voltage. The resulting system is able to extract the maximum power from photovoltaic generator, to achieve sinusoidal grid currents, and to ensure reactive power compensation. The voltage-balancing control of two split DC capacitors of the 3LT2I is achieved using three-level space vector modulation with balancing strategy based on the effective use of the redundant switching states of the inverter voltage vectors. The proposed system performance is investigated at different operating conditions.
Citation

M. BARKAT Said, Mohammed Belkeiri, Abdelhamid Rabhi, , (2016), "Control of Grid Connected Photovoltaic System Using Three-Level T-Type Inverter", [international] International Journal of Emerging Electric Power Systems , De Gruyter

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2015-11-10

Commande floue adaptative directe stable étendue appliquée à la machine asynchrone

Today, as a result of significant progress in the area of control of electrical machines, new techniques and approaches have emerged. In order nonlinear or having non constant parameters systems, conventional control laws may be inadequate because some performance can not be guaranteed in the presence of structural variations or external disturbances. It is then necessary to synthesize robust controls with respect to these disturbances. It is in this context that we propose in this work a new command combines the study of adaptivity with the uncertainty that derives adaptive fuzzy controllers. This study presents the directadaptive fuzzy control stability extended, which uses the theory of approximation and the theory of Lyapunov to establish a parametric adaptation law ensuring the stability and boundedness of all the control signals and the tracking error. The obtained results show that direct adaptive fuzzy control stability extended has proved a great effectiveness and a strong robustness in the presence of parameter variations and disturbances.
Citation

M. BARKAT Said, (2015-11-10), "Commande floue adaptative directe stable étendue appliquée à la machine asynchrone", [national] African Journals Online (AJOL) , African Journals Online (AJOL)

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2015

Control of three-level NPC inverter based grid connected PV system

This paper presents the control of a photovoltaic distributed generation system based on dual-stage topology of DC-DC boost converter and three-level neutral-point-clamped (NPC) voltage source inverter (VSI). Decoupling control strategy of three-level VSI is proposed to control the current injected into the grid, reactive power compensation, and DC-link voltage. The resulting system is able to extract the maximum power from photovoltaic generator, to achieve sinusoidal grid currents, and to ensure reactive power compensation. The voltage-balancing control of two split DC capacitors of the three-level VSI is achieved using three-level space vector modulation with balancing strategy based on the effective use of the redundant switching states of the inverter voltage vectors. The proposed system performance is investigated at different operating conditions.
Citation

M. BARKAT Said, Mohammed Belkheiri, , (2015), "Control of three-level NPC inverter based grid connected PV system", [international] 3rd International Conference on Control, Engineering & Information Technology (CEIT) , Tlemcen, Algeria

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Modeling and control of parallel inverters-based dualstage grid-connected PV system

Parallel operation of multi-inverters is an effective
way to increase the power capacity and the reliability of
distributed power systems. In this paper, a photovoltaic system
based on dual-stage topology of boost converter and parallel
three-phase inverters connected in distribution systems is
presented. Also, a decoupling control strategy of parallel
inverters system is proposed to control the current injected into
the grid, active and reactive power demand, and DC-link voltage.
The resulting system is able to extract the maximum power from
photovoltaic unit, to achieve sinusoidal grid currents, and to
ensure reactive power compensation. The proposed system
performance is investigated at different operating conditions.
Citation

M. BARKAT Said, Mohammed Belkheiri, , (2015), "Modeling and control of parallel inverters-based dualstage grid-connected PV system", [international] International Electrical and Computer Engineering Conference , Setif, Algeria

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2013

Sliding Mode Control of Interleaved DC-DC Boost Converter Integrated in PV system

Interleaving techniques are widely used to reduce input/output ripples, to increase the efficiency and to
increase the power capacity of the boost converters. This paper deals with the problem of
controlling energy generation systems including photovoltaic generator (PVG) and three phases
interleaved boost converter (IBC). The objective is to design controllers that are able to achieve (i)
input voltage tracking and robustness with respect to uncertainties that arise due to climate changes (ii)
and balanced current sharing between the used converters.
First a linear controller based on PI controller is proposed, and the behavior of IBC is compared with
conventional boost converter (CBC). Next a sliding mode controller (SMC) for three phases
interleaved boost converter is studied and compared to the conventional PI in terms of transient
response, current and voltage overshoot percentage, and input current ripple. Furthermore, the
robustness of the controllers is verified against variation for solar irradiation.
Citation

M. BARKAT Said, Mohammed Belkheiri, , (2013), "Sliding Mode Control of Interleaved DC-DC Boost Converter Integrated in PV system", [international] 1st First International Conference on Power Electronics and their Applications, pp. 1–10, Djelfa, Algeria, Nov. 06–07, 2013 , Djelfa, Algeria

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2008

Adaptive type-2 fuzzy control for induction motor.

This paper proposes a new indirect adaptive fuzzy controller based on interval type-2 fuzzy logic systems for indirect vector controlled induction motor drive. Type-2 fuzzy controller compared with type-1 fuzzy controller, has the advantage that it can take into account the linguistic uncertainties present in the rules of the estimated models. The proposed control scheme consists of a combination of two controllers: a type-2 fuzzy controller and a supervisory controller. The supervisory controller is used when the system loop tend to be unstable. The tuning parameters for the type-2 fuzzy controller will change according to some learning algorithms based on Lyapunov theorem.
Citation

M. BARKAT Said, Kheireddine Chafaa, Souad Chaouch, , (2008), "Adaptive type-2 fuzzy control for induction motor.", [international] The fifth International Multi-Conference on Systems, Signals & DevicesIEEE SSD08 , Philadelphia University- Amman- Jordan

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