分布式电源对配电网继电保护的影响

分布式电源环保、可靠,近年来发展较快.但该电源并网后会改变原有配电网的结构,进而改变故障电流的大小、流向、持续时间等.为解决此问题,构建了含分布式电源的配电网模型,推导出分布式电源并网前后配电网故障电流的计算公式,分析了分布式电源对故障电流的助增和汲流作用.该分析结果为新型继电保护的配置和动作值整定提供了依据.

Influences of Distributed Generation on Relay Protection in Distributed Network

The distributed generation develops fast recently because of its reliability and cleanliness. However, after the distributed generation is connected to the grid, configuration of distribution network will be changed, and the strength, flowing direction and dura- tion of fault current will be affected. In order to solve these problems, a distribution network model with distributed generation is built, the calculation formula of fault current before and after distributed generation connected is deduced, and the infeed and shunting actions of distributed generation on the fault current are analyzed. The results can provide a basis for new relay protection settings.