Research on Control Optimization for Dynamic Voltage Restorer Using Fuzzy Adaptive PI Control

Abstract

The voltage sag which is one of the power quality issues occurs the most frequently and has the greatest impact while causing the most serious economic losses. Dynamic voltage restorer is an effective method to tackle voltage sag and the control system is the most component of dynamic voltage restorer. The conventional proportional-integral control which has the advantages of designing simple and higher speed is a widely used control method in dynamic voltage restorer, but the proportional-integral control usually needs to regulate parameters to improve control accuracy for nonlinear system. In this paper, a fuzzy adaptive proportional-integral controller is proposed to control dynamic voltage restorer to mitigate the voltage sag issue. The fuzzy adaptive proportional-integral controller helps to complete a precise compensation and a faster-responding speed compared with a conventional proportional-integral controller. Moreover, the total harmonic distortion with fuzzy adaptive proportional-integral control caused by power electronic components also decreases. Finally, the effective results are validated through the simulation analysis of MATLAB/SIMULINK.