摘要
分布式电源(Distributed Generation,DG)接入配电网会引起保护检测到的电流发生变化,从而影响保护范围。本文以DG接入35kV配网为例,描绘了在线路不同位置发生三相短路故障时DG接入前后电流对比曲线。利用三段式电流保护约束条件,在不修改原有保护配置的前提下得出了最佳容量比,提出了DG对馈线电流保护的影响与DG的故障位置和接入容量有关。
As distributed generations are connected to the distribution grid leading to the change of the detected current for protection relay.With an example of DG parallel into the distribution network by 35 kV feeder line, the paper depicts the contrast curve of the three-phase short circuit fault current happend to different positions before and after DG access.The optimum capcity ration can be drawn based on the original protection program of three-current protection constraints.Finally,come to the conclusion that the impacts of DG to the network is related to the fault location and the maximum penetration level of DG.
出处
《电气技术》
2014年第6期52-55,共4页
Electrical Engineering
关键词
分布式电源
接入容量
故障位置
短路电流
distributed generation
maximum penetration level
fault laction
short-circuit
