中国电机工程学报2017，Vol.37Issue(z1)：1-11,11.DOI:10.13334/j.0258-8013.pcsee.161496
柔性高压直流环网直流侧故障保护策略研究
Studies on DC Fault Protection Strategies for MMC Based HVDC Grid
摘要
Abstract
DC fault protection is one of the key technologies in the development of HVDC grid. In view of the DC circuit breaker (DCCB) based HVDC grid fault protection method, this paper first studies the DC grid fault protection strategies based on DCCB's auxiliary inductor and the selection method of auxiliary inductor for DCCB. Then DC pole-to-pole short circuit fault characteristics were analyzed through a 4-terminal meshed HVDC grid. On this basis, this paper proposed the operating criteria of DCCB by using the combination of auxiliary inductor voltage and MMC DC voltage. In particular, all these criteria are measured by local measurements and independent of the real-time communication system. Finally, a model of 4-terminal meshed HVDC grid is built on Matlab/Simulink simulation platform, and the simulation results showed the fault protection strategy can selectively isolate faulty lines and buses, and ensure the healthy part can maintain normal operation. Also, the proposed strategy is not affected by fault location, power reversal, operation mode and short-circuit resistance, having a good versatility in HVDC grids with different structure.关键词
高压直流电网/直流断路器/附加电感选取方法/保护动作判据/保护策略Key words
high voltage direct current grid (HVDC) grid/DC circuit breaker (DCCB)/selection method of auxiliary inductor/operating criteria of protection/fault protection strategy分类
信息技术与安全科学引用本文复制引用
姚良忠,吴婧,王志冰,李琰,鲁宗相..柔性高压直流环网直流侧故障保护策略研究[J].中国电机工程学报,2017,37(z1):1-11,11.基金项目
国家电网公司科技项目(新能源发电基地多电压等级直流汇集组网及运行控制技术研究)(NYN17201600314).Sponsored by State Grid Corporation of China Science and Technology Project (NYN17201600314). （新能源发电基地多电压等级直流汇集组网及运行控制技术研究）
