ABDELMALIK Zorig

Abla MESSAOUDI , Aya KHALFALLAH

Commande d’un onduleur de tension à trois niveaux type NPC

Abdelli Imane B , Benchouikh Fedoua Oumsaad

Commande en boucle fermée d’un convertisseur DC-DC en cascade avec un onduleur de tension triphasé

Hamadi Habiba , Haffaf Amina

Commande et réalisation d’un convertisseur DC-DC (boost) entrelacé à deux bras

Ouanane Sara , Neche Imane

Validation pratique d’une commande linéaire d'un onduleur de tension triphasé à deux niveaux

Saad, ABDELAZIZ

Commande et implémentation d'un Onduleur De tension triphasé

Three-level neutral-point-clamped (NPC) inverter is used in many industrial applications due to its attractive advantages in terms of harmonics content, achieved power level, and electromagnetic interference reduction. However, the main concern in this topology is the imbalance of the neutral point (NP) voltage in the dc side of the inverter. Indeed, the NP voltage distorts the output voltage of the inverter and increases voltage stress on its switching devices. In this article, a new NP voltage balancing control based on modified three-level space vector pulse width modulation (SVPWM) is proposed. The core idea of this method consists in adjusting the application times of redundant vectors in such a way that the NP voltage is kept balanced. In this method, the appropriate adjustment direction is determined by measuring only the capacitor voltages and the output currents of the inverter. The performances of the proposed method are validated and compared through various experimental tests, and the obtained results show an excellent NP voltage balancing regardless of the modulation index values

Citation

ABDELMALIK Zorig , , (2022-06-28), Neutral Point Voltage Balancing Control Based on Adjusting Application Times of Redundant Vectors for Three-level NPC inverter, IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol:10, Issue:5, pages:5604 - 5613, IEEE

This paper suggested a circulating current control strategy dedicated for paralleled multilevel t-type inverters. The suggested circulating current control strategy consist in integrating into the three-level space-vector pulse width modulation a control variable allowing the adjustment of small vectors duty cycles. The method is easy to implement for modular design, and can effectively eliminate the circulating current even though, the inverters have an asymmetry in hardware or control parameters. The effectiveness of the proposed circulating current control is validated under different operating conditions through Processes-in-the Loop simulation (PIL) using TMS320F28335 DSP board.

Citation

ABDELMALIK Zorig , ,(2022), Modified 3LSVPWM for Circulating Currents Control in Paralleled 3Level T-type Inverters,19th IEEE International Multi-Conference on Systems, Signals & Devices (SSD 2022,Sétif, Algérie

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Citation

ABDELMALIKZorig , ,(2022); Programmation orientée objet en c++,Université de M'sila,

Parallel inverter is one of the most interesting topology to achieve high power level, overcame current limitation on the switching devices and also to enhance the output current waveforms. However, the circulating current results from the common connection of both AC and DC sides directly can increase the current stresses and conduction losses of the switching devices and reduces inverters efficiency. This paper provides an investment on the threelevel Space vector modulation and proposes a new strategy to eliminating the circulating current for paralleled three-level t-type inverters. Results obtained confirmed the performance and the effectiveness of the proposed circulating current control strategy.

Citation

ABDELMALIK Zorig , ,(2020), Circulating Current Control for Parallel Three-Level TType Inverters,2nd International Conference on Electronic Engineering and Renewable Energy ( ICEERE'20),Saidia, Moroco

This paper presents an overall control approach for a grid connected photovoltaic (PV) system based on three-level DC-DC boost converter (3LBC) on the front of a three-level t-type inverter (3LT 2 I) acting as active power filter. The neutral-point (NP) voltage balancing is ensured by a new control strategy applied for 3LBC; this avoids the need to change the conventional three-level space vector modulation (SVPWM) algorithm or to add additional components. The capability of the proposed system to control the current injected into the grid, compensate the harmonics and the reactive power demand, and also guarantee the DC-link capacitors voltages balancing is demonstrated through variety of simulations.

Citation

ABDELMALIK Zorig , ,(2019), Neutral Point Voltage Balancing Control and Quality power Improvement of PV System Based on Dual Three-level Stage Conversion,6th International Conference on Control Engineering & Information Technology (CEIT),Istanbul, Turkey

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

ABDELMALIK Zorig , Said BARKAT , Mohammed Belkheiri, Abdelhamid Rabhi, Frede Blaabjerg, , (2018), Sliding Mode Control and Modified SVM for Suppressing Circulating Currents in Parallel-Connected Inverters, Electric Power Components and Systems, Vol:46, Issue:9, pages:1061-1071, Taylor and Francis Online

Recently, parallel inverters have been investigated to provide multilevel characteristics besides their advantage to increase the power system capacity, reliability, and efficiency. However, the issue of differential currents imbalance remains a challenge in parallel inverter operation. The distribution of switching vectors of the resulting multilevel topology has a certain degree of self-differential current balancing properties. Nevertheless, the method alone is not sufficient to maintain balanced differential current in practical applications. This paper proposes a closed-loop differential current control method by introducing a control variable adjusting the dwell time of the selected switching vectors and thus maintaining the differential currents balanced without affecting the overall system performance. The control strategy, including distribution of switching sequence, selection of adjusted switching vectors, and calculation of adjusting times are described and analyzed in detail in this paper. Finally, experimental results confirm the performance and effectiveness of the proposed method.

Citation

ABDELMALIK Zorig , , (2017), Novel Differential Current Control Strategy Based on a Modified Three-Level SVPWM for Two Parallel-Connected Inverters, IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol:5, Issue:4, pages:1807-1818, IEEE

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

ABDELMALIK Zorig , Said BARKAT , Mohammed Belkeiri, Abdelhamid Rabhi, , (2016), Control of Grid Connected Photovoltaic System Using Three-Level T-Type Inverter, International Journal of Emerging Electric Power Systems, Vol:17, Issue:4, pages:377–384, De Gruyter

Multilevel inverters topology is an effective way to improve the capacity of full power converter in distributed generation system. However, the major concern for multilevel inverters is the fluctuation in the neutral-point (NP) voltage. This paper focuses on overall control including NP voltage balancing of a photovoltaic (PV) distributed generation system based on dual-stage conversion of three level DC-DC boost converter (3LBC) and three-level T-type inverter (3LT2I). The voltage-balancing control of two split DC capacitors of the 3LT2I has been transferred to the 3LBC, and thereby there is no need to change the conventional three-level space vector modulation (SVPWM) algorithm or to add additional components. Furthermore, it is simple and easy to implement and only one proportional-integral (PI) is needed to achieve good NP voltage balancing. Last, the capability of the overall system to control the current injected into the grid, reactive power compensation and keep DC-link NP voltage balance is investigated at different operating conditions.

Citation

ABDELMALIK Zorig , ,(2016), Control of three-level T-type inverter based grid connected PV system,13th International Multi-Conference on Systems, Signals & Devices (SSD),Leipzig, Germany

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

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

This paper presents the control of a photovoltaic distributed generation system based on dual-stage topology of three level DC-DC boost converter (3LBC) 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 design and the selection of 3LBC are based not only on boosting up the photovoltaic generator (PVG) voltage but also to ensure equal balancing of the DC-link voltage capacitors. Moreover, they do not change the conventional three-level space vector modulation witch required heavy computational capability to implement the neutral point balance control algorithm. The proposed system performance is investigated at different operating conditions.

Citation

ABDELMALIK Zorig , ,(2015), Control of grid connected photovoltaic system using dual three-level stage conversion,4th International Conference on Electrical Engineering (ICEE),Boumerdes, Algeria

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

ABDELMALIK Zorig , Said BARKAT , Mohammed Belkheiri, ,(2015), Modeling and control of parallel inverters-based dualstage grid-connected PV system,International Electrical and Computer Engineering Conference,Setif, Algeria

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

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

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

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