基于故障电流主动控制的柔性直流配电网故障定位方法  

Fault Location Method of Flexible DC Distribution Network Based on Active Control of Fault Current

作　　者：梅军[1] 张丙天 朱鹏飞 葛锐 严凌霄 陈萧宇 MEI Jun;ZHANG Bingtian;ZHU Pengfei;GE Rui;YAN Lingxiao;CHEN Xiaoyu(School of Electrical Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学电气工程学院,江苏省南京市210096

出　　处：《电力系统自动化》2021年第24期133-141,共9页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(52077037)。

摘　　要：为了提高现有柔性直流配电网故障定位方法的性能,保证直流配电网供电可靠性以及故障后快速恢复供电,提出基于故障电流主动控制的柔性直流配电网故障定位方法。利用混合模块化多电平换流器(MMC)的高可控性,将故障电流分为阶段Ⅰ与阶段Ⅱ。阶段Ⅰ主要实现故障电流快速抑制并为阶段Ⅱ平滑过渡提供条件。阶段Ⅱ通过注入特定频率的高频反向电流,实现故障的精确定位。介绍了故障参考电流的设计方法。以非对称“手拉手”式双端直流配电网为典型场景分析其故障定位原理。最后,在PSCAD/EMTDC搭建双端直流配电网仿真模型,验证了所提故障定位方法的可行性。In order to improve the performance of the existing fault location methods of flexible DC distribution networks,ensure the power supply reliability of DC distribution networks and quickly restore power supply after fault,a fault location method based on active fault current control is proposed.Using the high controllability of hybrid modular multilevel converters(MMCs),the fault current is divided into stageⅠand stageⅡ.In stageⅠ,the rapid suppression of fault current is realized and conditions are provided for smooth transition to stageⅡ.In stageⅡ,the precise fault location is realized by injecting high-frequency reverse current with the specific frequency.The design method of fault reference current is introduced.Taking the asymmetric“hand-in-hand”doubleterminal DC distribution network as a typical scenario,the fault location principle is analyzed.Finally,a simulation model of double-terminal DC distribution network is built in PSCAD/EMTDC to verify the feasibility of the proposed fault location method.

关 键 词：模块化多电平换流器 柔性直流配电网 故障电流抑制 故障定位 

分 类 号：TM721.1[电气工程—电力系统及自动化]