Voltage sag mitigation due to short circuit current using dynamic voltage restorer based on hysteresis controller

摘要

Voltage sag is a major problem in power system that must be solved. T o overcome the occurrence of the voltage sag, a system that well known as Dynamic Voltage Restorer (DVR) is needed. In an electrical power system, DVR is positioned in series between a source and load. There are several DVR voltage compensating methods, such as pre-sag method, inphase method and in-phase advance compensation. DVR need synchronization time for equals phase injection voltage so it can compensate voltage sag due to short circuit current. This work employs Discrete Fourier Transform (DFT) for phase detection and hysteresis voltage control. This paper presents modeling, analysis and simulation of DVR by using MATLAB.