分布式电源对配电网保护的影响

The Effects of Interconnection of Distributed Generator on Distribution Network Protection

分布式电源(DG)接入配电网后,改变了原有网络的短路电流流向,会导致原有馈线保护出现灵敏度降低、拒动、误动等问题.本文提出了一种自适应电流保护的整定原则,在此基础上对分布式电源接入系统的容量、位置以及故障位置的变化等因素对配电网继电保护可能产生的影响进行了定性分析,同时采用仿真软件进行仿真验证,仿真结果验证了本文方法的有效性。

As distributed generations are connected to the distribution grid,the short-circuit current direction will change,thus leading to the problems of decrease of sensitivity,refusing action and misoperation of the traditional line protection.In this paper,the effect of distributed power access system（including its capacity,accessing position and system＇s different fault position etc） on traditional distribution network protection is qualitatively analysed on the basis of putting forward a new setting principle of the self-adaptive current protection.The simulation results also verify the validity of this method.