PERFORMANCE STUDY OF DSTATCOM WITH PI CONTROLLED SVPWM AND HYSTERESIS CURRENT CONTROLLER FOR POWER FACTOR IMPROVEMENT

ABSTRACT A Distribution STATCOM (DSTATCOM) is a current controlled Voltage Source Converter (VSC) used for reactive power compensation, when connected to the power system. The DSTATCOM using PI controlled Space Vector Pulse Width Modulation (SVPWM) technique has high peak overshoot and large settling time. SVPWM technique requires Phase Locked Loop (PLL) for measurement of varying frequency that is required for Park's transformation and for control. This paper presents a DSTATCOM for reactive power compensation using space vector based Hysteresis Current Controller (HCC) and compares its performance with that of the PI controlled SVPWM method. The HCC technique is robust and has faster transient performance compared to SVPWM control technique. In addition, this technique does not require PLL for measurement of frequency, has reduced switching losses, and is easy to implement. The performance of DSTATCOM with HCC is studied in MATLAB/SIMULINK environment