电网技术2016，Vol.40Issue(4)：1257-1264,8.DOI:10.13335/j.1000-3673.pst.2016.04.041
逆变型分布式电源T接线路后纵联差动保护的改进方案
An Improved Scheme of Longitudinal Differential Protection for Teed Lines With Inverter-Based Distributed Generations
摘要
Abstract
Wheninverter-based distributed generation(DG) isconnectedto distribution networkwitha teed line, longitudinal differential protection may fail to operate only by raising setting values. Based on information from potential transformerson high voltage bus,a protection scheme was proposed,usingdifference betweenpositive-sequence compensating voltages as an assistant criterion.Using phase difference betweenpositive-sequence compensating voltage and positive-sequence differential current, fault dead zonecan beeliminated. Thisprotection scheme is simple and practicable. The new scheme couldnot onlyrealizeimmediatetrip, butbe immune toinfluencefromcapacity of DG, transient resistance, angular phase difference of the system potential, etc. At last, a casemodel of110kV high voltage distribution network with inverter-based DG was built in PSCAD. Compared with traditional longitudinal differential protection, reliability and effectiveness of the improved scheme was verified.关键词
逆变型分布式电源/T接线路/正序补偿电压/正序差动电流/相位差Key words
inverter-based distributed generation/teed lines/positive-sequence compensation voltage/positive-sequencedifferential current/phase difference分类
信息技术与安全科学引用本文复制引用
刘幸蔚,李永丽,陈晓龙,张惠智..逆变型分布式电源T接线路后纵联差动保护的改进方案[J].电网技术,2016,40(4):1257-1264,8.基金项目
国家自然科学基金项目(51177108)；中国南方电网公司重点科技项目(K-KY2013-116)。Project Supported by National Natural Science Foundation of China(NSFC)(51177108) （51177108）
Key Project Supported by China Southern Power Grid(K-KY2013-116) （K-KY2013-116）
