基于正序电流故障分量的有源配电网纵联保护  

A Pilot Protection Method Based on Positive Sequence Fault Component Current for Active Distribution Networks

作　　者：周成瀚 邹贵彬[1] 杜肖功 杨晶晶[3] ZHOU Chenghan;ZOU Guibin;DU Xiaogong;YANG Jingjing(Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education(Shandong University),Jinan 250061,Shandong Province,China;Shandong Xunfengdianzi Limited Company,Jinan 250200,Shandong Province,China;State Grid Weifang Power Supply Company,Weifang 261021,Shandong Province,China)

机构地区：[1]电网智能化调度与控制教育部重点实验室(山东大学),山东省济南市250061 [2]山东迅风电子有限公司,山东省济南市250200 [3]国网潍坊供电公司,山东省潍坊市261021

出　　处：《中国电机工程学报》2020年第7期2102-2112,共11页Proceedings of the CSEE

基　　金：泉城产业领军人才支持计划(2018014);国家电网公司科技项目(SGSDWF00FCJS1800398)。

摘　　要：分布式电源就地接入配电网改变了传统辐射状配电网的拓扑与故障特性,对常规的馈线电流保护带来了影响。对此,基于分析不同类型分布式电源在区内外故障时正序电流故障分量的特征差异,提出一种基于正序电流故障分量的有源配电网保护新方法。该方法利用馈线两端正序电流故障分量的幅值比作为动作量,利用正序电流故障分量的相位差构造具有自适应性的制动阈值,能够适应有源配电网在不同场景下的保护需求,且具有灵敏性高、不受负荷影响、耐受过渡电阻能力强等优点。最后,基于所提方法开发了具有保护功能的智能终端样机,动模实验与RTDS测试验证该方法的有效性。The integration of distributed generators(DGs)changes the topology and fault characteristics of the traditional radial distribution network,which has an impact on the conventional current protection of feeder.Therefore,based on the analysis of the difference of positive sequence fault components(PSFC)current with different types of DGs when a fault occurs inside or outside the protected zone,a novel protection method based on PSFC current was proposed.This method uses the amplitude ratio of PSFC current at the two ends of the feeder as the action parameter,and uses the phase difference of PSFC current to construct an adaptive braking threshold.This method can adapt to the protection requirements of the active distribution network in different scenarios,and has the advantages as high sensitivity,not affected by the load and good performance under the condition of high resistance fault.Finally,based on the proposed protection method,a smart terminal prototype with protection function was developed.Dynamic model tests and RTDS tests verify the effectiveness of the proposed method.

关 键 词：有源配电网 正序故障分量 纵联保护 自适应阈值 保护样机测试 

分 类 号：TM77[电气工程—电力系统及自动化]