基于电流动态偏差值的MMC-MTDC直流侧故障识别  

MMC-MTDC DC-side Fault Identification Based on Current Dynamic Deviation Value

作　　者：谭阳红[1] 蒋鹏 罗研彬 王浩宇 TAN Yanghong;JIANG Peng;LUO Yanbin;WANG Haoyu(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学电气与信息工程学院

出　　处：《电力系统及其自动化学报》2019年第11期1-9,共9页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(61102039,51577046);国家重点基础研究发展计划(973计划)资助项目(2012CB215106);湖南省自然科学基金资助项目(14JJ7029);浙江省重中之重控制科学与工程一级学科开放基金资助项目

摘　　要：为了快速可靠识别基于模块化多电平换流器MMC(modular multilevel converter)的多端柔性直流MTDC(multi-terminal direct current)输电系统直流侧故障,提出了一种基于单端单极电流的柔性直流电网故障识别方案。该方案通过对电流动态偏差值极值的检测与电流累差值的计算实现直流线路故障快速定位,采用母线短时能量保护区分直流母线故障和线路故障,并根据所提保护方案设计了一套故障检测和识别单元。在PSCAD/EMTDC仿真平台上搭建仿真模型,通过仿真算例验证了该保护方案能在各种情况下快速、可靠地识别故障,无需双端数据通信,无需复杂数据分析与处理,满足多端柔性直流输电系统对保护的要求。To quickly and reliably identify the DC-side faults in a flexible multi-terminal direct current(MTDC)system based on modular multi-level converters(MMCs),a fault identification scheme for the flexible DC grid based on oneterminal one-pole current is proposed in this paper.In this scheme,the rapid positioning of faults on the DC line is real?ized by detecting the extremum value of the current dynamic deviation value and calculating the current differential val?ue,and the bus short-time energy protection is used to distinguish the DC bus fault from the line fault;in addition,a set of fault detection and identification units is designed according to the proposed scheme.A simulation model is built on the PSCAD/EMTDC simulation platform.Based on simulations of a numerical example,it is verified that the pro?posed protection scheme can identify faults quickly and reliably in all cases without the need for double-terminal data communication or analysis and processing of complex data,satisfying the protection requirements of the flexible MTDC transmission system.

关 键 词：柔性直流电网 保护方案 单端单极电流 动态偏差值 故障识别单元 

分 类 号：TM71[电气工程—电力系统及自动化]