基于改进电流相差保护的微电网保护方案  

Micro-grid protection scheme based on improved current phase difference protection

作　　者：周石金 何晋[1] 杨凡 骆通 管恩齐 Zhou Shijin;He Jin;Yang Fan;Luo Tong;Guan Enqi(School of Electrical Information Engineering,Yunnan Min Zu University,Kunming 650000,China)

机构地区：[1]云南民族大学电气信息工程学院,昆明650000

出　　处：《电测与仪表》2023年第9期132-137,共6页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(61365007,61761049);云南省教育厅科学研究基金项目(2020Y0242)。

摘　　要：针对微电网在并网运行和独立运行时不同故障特性以及微电网潮流的双向特性,引入了一种基于改进电流相差保护的微电网保护方案,该方案以逆变型分布式电源输出端电压为起动判据,结合母线两端电流相位差判据,保证微电网在两种运行状态下都可以准确地区分区内外故障并切除故障线路。在PSCAD/EMTDC仿真软件上进行了算例仿真,验证了基于改进电流相差保护方案的有效性和可靠性。Aiming at the different fault characteristics of micro-grid during grid-connected operation and independent operation and the bidirectional characteristics of micro-grid power flow,a micro-grid protection scheme based on improved current phase difference protection is introduced.This scheme uses the voltage at the output terminal of Inverter-interfaced distributed generator as the starting criterion and combines the current phase difference criterion at both ends of the bus bar,ensuring that the micro-grid can accurately distinguish the internal and external faults and remove the faulty line in both operating states.An example simulation is carried out on PSCAD/EMTDC simulation software to verify the effectiveness and reliability of the improved current phase difference-based protection scheme.

关 键 词：微电网 故障特性 逆变型分布式电源 电流相差 保护 

分 类 号：TM711[电气工程—电力系统及自动化]