Simulation of a dynamic voltage restorer in distribution systems with microgrids

摘要

This paper analyzes the structure, the operating characteristics and the control strategy of microgrid. Based on the requirements of power quality and research achievements of the traditional power system, it is considered to introduce the Dynamic Voltage Restorer (DVR) in power distribution system with microgrid to improve the power quality. A method to detect voltage sags is presented, which incorporates morphological low-pass filters with the d-q transformation. A simulation model of the DVR based on PSCAD/EMTDC is proposed. Combining with the microgrid model, the simulation results prove that the topology and control strategy of DVR is correct and effective.