含大容量分布式电源的配电网继电保护影响分析和保护方案研究

分布式电源的接入使配网由单电源变成多电源结构,当线路或母线发生短路故障时,含大容量分布式电源配网产生的短路电流会对原有保护配置产生影响,造成保护装置拒动或误动。对在未接入和接入DG的配网结构下,相同点发生短路故障时流过各保护装置的短路电流大小和对保护的影响进行了研究,对含DG的配网重合闸方式进行了分析,并提出了一种新的保护方法。

Impacting Analysis & Protection Scheme Researches of Distribution Network Relay Protection of Distributed Power Source with High Capacity

The access of DG makes the distribution network change from a single power supply to multiple supplies.When a fault happens to the line or bus,the short current of DG can influence relay protection.This paper qualitatively analyzes the short current of the same current breaker between the accessed DG and the unaccessed DG.This paper also analyzes the mode of auto-reclosing and proposes a new protection method.