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1

Control Neuro-Fuzzy of a dual star induction machine (DSIM) supplied by five-level inverter

Bentouhami L., Abdessemed R., Kessal A., Merabeta E.

Journal of Power Technologies

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2018

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Vol. 98, nr 1

70--79

EN

This work relates to a hybrid scheme (Neuro-Fuzzy) for speed control of a dual star induction motor (DSIM) with enhanced performance. A 4-layer network is utilized to set the Fuzzy elements in order to minimize error square. To control this machine, two five-level inverters with PWM techniques are introduced and an indirect field oriented method is used. Simulation results are presented for the NF controller; it is observed that the NFC gives better responses and robustness for the speed control of this machine with its load disturbances and parameter variations, such as increased rotor resistance and moment of inertia. The results are compared with results obtained from a conventional inverter. Notably, there is a great drop in the stator currents, and the magnitude of the pulsating electromagnetic torque is reduced for a five-level inverter compared with a conventional inverter.

2

Four Leg DSTATCOM based on Synchronous Reference Frame theory with Enhanced Phase Locked Loop for compensating a four wire distribution network under unbalanced PCC voltages and loads

Chebabhi A., Fellah M.-K., Kessal A., Benkhoris M.-F.

Journal of Power Technologies

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2016

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Vol. 96, nr 1

15--26

EN

This paper presents a Distribution Static Compensator based on Four Leg Voltage Source Inverter (4-leg VSI DSTATCOM) with controlling by Synchronous Reference Frame theory (SRF) in the dq0 frame with Enhanced Phase Locked Loop based on Self-Tuning Filter (EPLL-STF) used for compensating four-wire distribution systems.The proposed 4-leg VSI DSTATCOM is used for load balancing, source harmonics filtering, reactive power compensation and power factor correction, and source neutral wire current compensation at the point of common coupling (PCC) in the four-wire distribution network under unbalanced linear loads and nonlinear load variation with various source and PCC voltages conditions. The new SRF theory with EPLL based on STF is used for harmonics current extraction and good estimation of PCC voltages without harmonics under unbalanced PCC voltages and loads. Three dimensional space vector modulation (3D SVM) is used to generate the gate switching pulses for the 4-leg VSI and to circumvent the problems of the switching frequency variant, and for DC bus voltage capacitor and compensating 4-leg VSI DSTATCOM currents we are going to use the PI controller (Proportional-Integral). The effectiveness of the proposed 4-leg DSTATCOM under unbalanced PCC voltages and loads with various control strategies are demonstrated through simulation using sim-power-system and S-Function integrated in Matlab simulink.

3

Analysis and design of photovoltaic pumping system based on nonlinear speed controller

Zebiri F., Kessal A., Rahmani L., Chebabhi A.

Journal of Power Technologies

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2016

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Vol. 96, nr 1

40--48

EN

This paper presents an analysis by which the dynamic performances of a permanent magnet brushless DC (PMBLDC) motor is controlled through a hysteresis current loop and an outer speed loop with different controllers. The dynamics of the photovoltaic pumping drive system with sliding mode speed controllers are presented. The proposed structure is comprised of a photovoltaic generator associated to a DC-DC converter controlled by fuzzy logic to ensure maximum power point tracking. The PWM signals are generated by the interaction of the motor speed closed-loop system and the current hysteresis. The motor reference current is compared with the motor speed feedback signal. The considered model has been implemented in the Matlab /Simpower environment. The results show the effectiveness of the proposed method in increasing the performance of the water pumping system.