Multifunctional Dynamic Voltage Restorer Implementation with Resonance Controller for Emergency Control in Distribution Systems

Abstract- The dynamic voltage restorer(DVR) is a multifunction device used in distribution system to control voltage disturbances. In this paper, a multifunctional DVR protects the load voltage by posi-cast and P+ Resonant controllers when the source of disturbance is the parallel feeders. This posi-cast and P+ Resonance controllers improve the transient response and eliminate the steady state error in DVR response, respectively. The DVR acts as a virtual impedance with the main aim of protecting the Point of common coupling (PCC) voltage during downstream fault. The proposed algorithm is applied to some disturbances in load voltage caused by induction motors starting, and a three-phase short circuit fault. Also, the capability of the proposed DVR has been tested to limit the downstream fault current. Simulation results show the performance of the DVR to control the emergency conditions of the distribution systems