适用于逆变型电源接入的配电网故障方向判别元件  

Fault Direction Discriminating Element Used for the Distribution Network with IIG Integration

作　　者：朱逸凡 赵宏程 陈争光 徐辰婧 孙晓佳 张俊杰 吴慧 王兴国 王文焕 郑涛 ZHU Yifan;ZHAO Hongcheng;CHEN Zhengguang;XU Chenjing;SUN Xiaojia;ZHANG Junjie;WU Hui;WANG Xingguo;WANG Wenhuan;ZHENG Tao(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;State Grid Tibet Power Co., Ltd. Electric Power Research Institute, Lhasa 850000, China;State Key Laboratory of Power Grid Safety and Energy Conservation, China Electric Power Research Institute Co., Ltd., Beijing 100192, China;State Grid Zhejiang Electric Power Co., Ltd. Economic Technology Research Institute, Hangzhou 310008, China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206 [2]国网西藏电力有限公司电力科学研究院,西藏拉萨850000 [3]中国电力科学研究院有限公司电网安全与节能国家重点实验室,北京100192 [4]国网浙江省电力有限公司经济技术研究院,浙江杭州310008

出　　处：《中国电力》2019年第5期76-82,共7页Electric Power

基　　金：国家重点研发计划资助项目(2016YFB0900600)~~

摘　　要：分布式电源接入配电网使得传统的单电源辐射状网络变成部分线路多电源供电的复杂网络,仅依靠阶段式电流保护已不再适用,因此急需对配电网原有保护进行改造。而由于分布式电源的结构特征与控制方法不同于传统发电机,传统方向元件的灵敏性大大降低甚至存在误判的可能性。以逆变型电源接入配电网为例,提出一种新的方向判别元件。通过限制逆变型电源接入位置实现短路电流性质区分;设置电流整定值,将各保护进行分类并采用不同的方向判别逻辑,仅根据短路电流与整定值之间的大小关系,便能准确区分正、反方向故障。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.

关 键 词：继电保护 逆变型电源 接入位置 短路电流 方向判别元件 

分 类 号：TM771[电气工程—电力系统及自动化]