摘要
含分布式电源(DG)的配电网在发生短路故障时,DG注入的电流可能会导致过电流保护误动,因此需要根据电流保护分析DG的准入容量问题。首先分析各个故障点对电流Ⅰ,Ⅱ,Ⅲ段保护可能产生的影响,提出了基于选择不同DG暂态阻抗的计算最大接入容量的方法。对于电流保护Ⅰ段采用分布式电源的次暂态阻抗,对于电流保护Ⅱ段和Ⅲ段则采用分布式电源的暂态阻抗,得出了DG最大容量的约束条件,最后通过仿真说明了该方法既符合DG实际的暂态过程,又能在满足现有电流保护不误动的条件下得到DG的最大容量。
When the short circuit fault occurs in the distribution network with distributed generation （DG） connected, the DG injection current may cause misoperation of overcurrent protection. Therefore, the DG in- tegration capacity needs to be analyzed on the basis of current protection. Firstly, the impact of each failure on current protection section Ⅰ ,Ⅱ and Ⅲ are analyzed and the method of computing the maximum integra- tion capacity based on selection of different transient impedances of DG is proposed. The DG sub-transient impedance is used to analyze the influence on protection section Ⅰ and the transient impedance is used to analyze that on section Ⅱ andⅢ. The constraints on the maximum capacity of DG have been obtained. The simulation results show that the method is consistent with the actual transient process of DG and can help ob- tain the maximum capacity of DG without misoperation of the existing current protection.
出处
《浙江电力》
2012年第9期5-9,共5页
Zhejiang Electric Power
关键词
暂态阻抗
分布式电源
电流保护
transient impedance
distributed generation
current protection
