B. Mazari

Control and optimization of shunt active power filter parameters by fuzzy logic

This paper presents the optimization of shunt active power filter parameters based on fuzzy logic control. The current active filter controller is based on constant or fuzzy hysteresis-band techniques, which are employed to derive the switching signals and also to choose the optimal value of the decoupling inductance. The dc voltage controller optimizes the energy storage of the dc capacitor, and proportional-integral and fuzzy logic controllers are developed and compared. Simulation results, obtained with MATLAB/Simulink simulation software configured under several loads, are presented and discussed to demonstrate the effectiveness of fuzzy logic controllers in optimizing the pulse-width modulation technique and reducing the values of the passive elements of the active power filter.

Determination of Voltage References for Series Active Power Filter Based on a Robust PLL System

Power quality (PQ) is one of the most important issues of modern electrical distribution. The series active filter can play a very significant role in the correction of PQ problems such as voltage unbalance, sag, interruption and voltage harmonics. This paper deals with the determination of voltage references for series active power filter based on a robust three-phase digital locked loop (PLL) system. Whatever the nature of supply voltages perturbation, the PLL block allows to extract fundamental positive sequence voltages system on the common coupling point and to estimate the mains frequency. Various regulators PI, RST and fuzzy logic are studied and compared in order to assure good reliability, a fast tracking performances and a good attenuation of undesirable frequencies. The robustness of the regulators allows the PLL operating under non ideal conditions and provides good results under unbalanced and/or distorted supply voltages conditions. Simulation results are presented to confirm the validity of the proposed design.

A fuzzy hysteresis voltage and current control of an Unified Power Quality Conditioner

This paper presents a new control design of an unified power quality conditioner (UPQC) for harmonics and voltage compensation in a power distribution system. The topology of the UPQC is based on a combination of two 3-phase series and parallel active power filters. The determination of voltage references for series active power filter is based on a robust three-phase digital phase locked loop (PLL) system using fuzzy regulator. Control strategies related to fuzzy hysteresis band voltage and current control methods, where the band is modulated with the system parameters to maintain the modulation frequency nearly constant are developed. Simulation results based on MATLAB/SIMULINK are presented to verify the effectiveness and the viability of the proposed control technique.

Adaptive PI Controller using Fuzzy System Optimized by Genetic Algorithm for Induction Motor Control

In this paper, an optimal fuzzy gain scheduling of PI controller is adopted to speed control of an induction motor. First, a designed fuzzy gain scheduling of PI controller is investigated, in which fuzzy rules are utilized on-line to adapt the PI controller parameters based on the error and its first time derivative. However, the major disadvantage of the fuzzy logic control is the lack of design techniques, for this purpose we propose an optimization technique of the fuzzy logic adapter parameters using genetic algorithm. The effectiveness of the complete proposed control scheme is verified by numerical simulation. The numerical validation results of the proposed scheme have presented good performances compared to the fuzzy controller which have parameters chosen by the human operator

Torque Ripple Minimization of Switched Reluctance Motor Using Hysteresis Current Control

Due to the reluctant effect that exists between the stator and the rotor and its conception, the torque of switched reluctance motor (SRM) has a ripple waveform. Hence it is necessary to reduce these undulations, which are undesirable and harmful for a best fonctionnement of system. In order to minimize these undulations, we present in the follow paper the current hysteresis control of the SRM supplied with half-bridge asymmetrical inverter. This is realized with a right angles commutations choice of the power converter

Adaptive backstepping controller for linear induction motor position control

Purpose – The purpose of this paper is to propose mover position control of linear induction motor (LIM) using an adaptive backstepping approach based on field orientation.Design/methodology/approach – First, the indirect field‐oriented control LIM is derived. Then, an adaptive backstepping approach based on field‐oriented control of LIM is proposed to compensate the uncertainties which occur in the control. Mover position amplitude tracking objective is formulated, under the assumption of unknown total mass of the moving element, viscous friction, and load force, so that the position regulation is achieved.Findings – The effectiveness and robustness of the proposed control scheme are verified by numerical simulation using Matlab/Simulink model. The numerical validation results of the proposed scheme have presented good transient control performances and robustness to uncertainties compared to the conventional backstepping control design.Originality/value – The paper presents an adaptive backstepping appr...

Linear induction motor control using sliding mode considering the end effects

In this paper, the mover speed control of a linear induction motor using sliding mode control design considering the end effects is proposed. Firstly, the indirect field oriented control LIM is derived taking into account the end effects. Then, sliding mode control design is investigated to achieve a speed and flux tracking objective under load thrust force disturbance. The numerical simulation results of the proposed scheme have presented good performances as compared to the classical sliding mode control and to proportional-integral controllers.

Direct Field-Oriented Control Design using Backstepping Technique for Induction Motor Speed Control

In this paper, the speed control of an induction motor using backstepping design is proposed. First, the direct field oriented control IM is derived. Then, a backstepping for direct field oriented control is proposed to compensate the uncertainties which occur in the control. The effectiveness of the proposed control scheme is verified by numerical simulation. The numerical validation results of the proposed scheme have presented good performances compared to the conventional direct-field oriented control

Fuzzy-Sliding Controller Design for Single Sided Linear Induction Motor Position Control

In this paper, the position control of linear induction motor using fuzzy sliding mode integral controller design is proposed. First, the indirect field oriented control LIM is derived. Then, a designed sliding mode integral control system with an integral-operation switching surface is investigated, in which a simple adaptive algorithm is utilized for generalised soft-switching parameter. Finally, a fuzzy sliding mode controller is derived to compensate the uncertainties which occur in the control, in which the fuzzy logic system is used to dynamically control parameter settings of the SMIC control law. The effectiveness of the proposed control scheme is verified by numerical simulation. The numerical validation results of the proposed scheme have presented good performances compared to the conventional sliding mode controller.

Fuzzy Sliding Mode Based on Indirect Field Orientation for Induction Motor Drive

In this paper, the design of a speed control scheme based on fuzzy-sliding mode control for indirect field-orientated induction motor (IM) is proposed. In the speed controller, a fuzzy logic controller replaces the discontinuous part of the classical sliding mode control law. The decoupling scheme also uses two fuzzy sliding mode controllers to regulate the d-axis and q-axis stator currents respectively. This new current controller exhibits several advantages such as fast dynamic response, high quality decoupling, rejection of disturbance uncertainties and robustness to parameter variations. The numerical simulation results of the proposed scheme have presented good performances as compared to the classical sliding mode control and to proportional-integral controllers