Marjan Bahadori - Department of Electrical Engineering, Khouzestan Science and Research Branch, Islamic Azad University, Ahvaz, Iran
Seyed Saeed Allah Mortazavi - Department of Electrical Engineering, Shahid Chamran University, Ahvaz, Iran
Mahmood Joorabian - Department of Electrical Engineering, Shahid Chamran University, Ahvaz, Iran
Arash Rohani - Department of Electrical Engineering, Shahid Chamran University, Ahvaz, Iran

In this paper, a new fuzzy controller for a three-phase and three-wire distribution static compensator (DSTATCOM) is presented to improve power quality. A three-leg voltage source converter based DSTATCOM is used to control the harmonic currents for two nonlinear loads. In this control system, the gate pulses for IGBT switches are provided by a hysteresis controller, using samples of source voltages and currents. The derived reference currents, obtained by the direct method of reference current estimation with two PI and Fuzzy control models are simulated in a MATLAB/ Simulink environment and each performance is analyzed. Comparisons show that the fuzzy controller performs better than a classic PI controller

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