Analysis, Design and Implementation of Single Phase SRF Controller for Dynamic Voltage Restorer under Distorted Supply Condition

The mitigation of single phase voltage sag under distorted supply condition has been effectively performed by Dynamic voltage restorer (DVR). The concept of inherently used three phase synchronous reference frame theory (SRFT) has been utilized to simply develop single phase SRFT. The single phase SRFT has been applied in the design of controller for DVR which generates reference instantaneous injected voltage. The proposed controller utilizes moving average filter (MAF) for the extraction of positive sequence fundamental component of distorted supply voltage. The simulation results of controller for DVR proves its effectiveness in mitigation of voltage sag under distorted supply voltage.