Vector Proportional Integral Controller in Series Connected Custom Power Device for Voltage Quality Enhancement

Dynamic Voltage Restorer (DVR) is one of the most efficient and economical series connected custom power device having a major application in Power Quality Enhancement at consumer and distribution level. In the control structure, the DVR usually utilizes rotating reference frame, which comes with certain downsides. Main purpose of this study is to execute a performance analysis on both rotating and stationary reference frame based DVR's. Cascaded controllers with an outer voltage controller and an inner current controller have been used as control strategy. As current controllers, both Proportional Integral (PI) and Vector Proportional Integral (VPI) controllers are used separately to compare their performance using MATLAB/Simulink. This comparative analysis has been carried out by considering settling time, overshoot and error signals for linear as well as non-linear loads while taking the computational time delays into account.