ABSTRACT
The performances of the p-q and Id-Iq control strategies were evaluated by comparing the total harmonic distortions (THDs) in compensated source currents and DC link voltage regulation under balanced, unbalanced, and distorted/ nonsinusoidal supply conditions. DC link voltage regulation with the help of the proportional-integral (PI) controller, type 1 fuzzy logic controller (FLC), and type 2 FLC with different fuzzy MFs (trapezoidal, triangular, and Gaussian MF) to minimize the power losses occurring inside APF is studied. The various drawbacks encountered in the conventional PI controller were discussed. Next, research concentrated on the implementation of type 1 FLC with different fuzzy MFs (trapezoidal, triangular, and Gaussian MF); this also suffers from several drawbacks, resulting in severe deterioration of APF performance. Hence, we developed type 2 FLC with different fuzzy MFs that could overcome the drawbacks observed in the PI and type 1 FLC. Three-phase reference current waveforms generated by the proposed scheme were tracked by the three-phase voltage source converter in a hysteresis band control scheme. The performance of the control strategies was evaluated in terms of harmonic mitigation and DC link voltage regulation. The simulation (MATLAB®) results were validated with real-time implementation on a real-time digital simulator (OPAL-RT).
