Influence of distributed generation on fault characteristics and relay protection of rural distribution network

Abstract

High proportion distributed generation affect traditional rural distribution network. In the paper, a typical line model of rural distribution network with high proportion distributed generation was constructed, and the current and voltage characteristics of rural distribution network after fault were analyzed. At the same time, the compound voltage blocking element and autoreclosure strategy of current protection of rural distribution network were analyzed. The results showed that the short circuit current at the protection location was lower than that without distributed generation, and the voltage of the whole line after the fault was higher than that without distributed generation. In addition, if the autoreclosure strategy of the circuit breaker at the head of the line adopts the non-voltage detection mode, it may cause failure of the breaker reclosing.