﻿ 微电网孤岛运行故障分析

# 微电网孤岛运行故障分析Fault Analysis of Isolated Island Operation of Micro-Grid

Abstract: Micro-grid system is a new development direction of distributed generation system. In this paper, the operation characteristics of PQ and VF control inverter are analyzed, the mathematical model is established based on the control strategy of inverter, and the critical condition of the fault is derived. According to the working characteristics of the micro-grid in grid connected operation and islanded operation, by using the node voltages and currents in fault condition, micro-grid voltage and current equations in the run time are derived, and the fault analysis method is established. At last, by using the PSCAD, a simulation system of isolated island operation of low voltage of 380 V is built, testing the validity of the proposed method.

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