Fault Direction Discriminating Element Used for the Distribution Network with ⅡG Integration

doi:10.11930/j.issn.1004-9649.201810022

Abstract

Abstract: The access of DG (distributed generation) to distribution network makes the traditional radiant network with single generation become a complex network with multiple generations, which makes the phased current protection no longer suitable. Thus, it is urgent to renovate the original protections of distribution networks. However, due to the difference between DGs and traditional generators in structure and control method, the sensitivity of traditional directional components significantly decreases, which makes misjudgment even possible. In this paper, an adaptive direction discriminating element is proposed by taking the distribution network with ⅡG (inverter-interfaced generation) as an example. Firstly, the characteristics of short-circuit currents are distinguished by restricting the access position of ⅡG. Then, by setting the current setting value, the relay protections at different locations are classified and equipped with different logics of determining the direction of fault. Finally, according to the relationship between the short-circuit current and the setting value, the faults of positive and reverse directions can be distinguished.

Key words: relay protection, inverter-interfaced generation (ⅡG), access position, short circuit current, direction discriminating element

CLC Number:

TM771

ZHU Yifan, ZHAO Hongcheng, CHEN Zhengguang, XU Chenjing, SUN Xiaojia, ZHANG Junjie, WU Hui, WANG Xingguo, WANG Wenhuan, ZHENG Tao. Fault Direction Discriminating Element Used for the Distribution Network with ⅡG Integration[J]. Electric Power, 2019, 52(5): 76-82.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201810022

https://www.electricpower.com.cn/EN/Y2019/V52/I5/76

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