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Matrix converter (MC) is a direct energy conversation device without dc-link components. Therefore, the output of the converter is directly affected by the disturbances in the input voltages. Many researchers have made an effort to overcome this problem.In this paper, the behaviors of the MC have been investigated under the distorted input voltage conditions. A fuzzy logic control (FLC) based novel compensation method is proposed, which performs close loop control of the output current to improve the output performance of the MC. Some results are presented to prove the effectiveness of the proposed compensation technique.

Abstract:In recent years, active power filters (APFs) have become popular because of their excellent current harmonics and reactive power mitigation ability. The performance of the APF is directly related to the selected control strategy, which is mainly divided into 2, the reference current generation and current control. Most of the reference current generation methods are very complicated and require precise mathematical expressions. Moreover, being the most preferred current control method, conventional hysteresis controllers have a fixed bandwidth, which causes different total demand distortion values under different load conditions. In this study, a novel control scheme for a single-phase shunt APF is proposed. The proposed scheme uses an uncomplicated modification of the sine multiplication method for extraction of the reference filter current. Moreover, it employs an adaptive hysteresis current controller that changes its bandwidth according to the active power demand of the load. Thus, the requirements of the current harmonics limits specified in IEEE Std. 519-1992 are always fulfilled under different load conditions. A single-phase shunt APF controlled by the proposed scheme is modeled and simulated under nonlinear load conditions using MATLAB/Simulink.The simulation results indicate that the APF effectively compensate the current harmonics and reactive power at the point of common coupling of the AC mains.

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