中国电机工程学报2017，Vol.37Issue(8)：2177-2184,8.DOI:10.13334/j.0258-8013.pcsee.162229
架空线双极MMC-HVDC系统直流短路故障分析和保护
DC Short-circuit Fault Analysis and Protection for the Overhead Line Bipolar MMC-HVDC System
摘要
Abstract
The invention of modular multilevel converters (MMCs) promotes the development of high voltage direct current transmission (HVDC) technology. With MMC-HVDC technology gradually expanding to overhead line transmission occasions, DC fault clearance and protection come to be particularly important. This paper studied the DC short-circuit fault characteristics of the bipolar MMC-HVDC system adopting overhead line. The equivalent circuit models under short-circuit fault by low resistance and high resistance were established respectively, and the analytic calculation formulas of fault current were deduced. Base on the PSCAD/EMTDC, a simulation model of bipolar system was built, and the simulation results verified the validity of the derivation formulas. Finally, an arm bypass protection method to cope with DC short-circuit fault was proposed. From the simulation results, it is concluded that this protection method can not only restrict the fault current of sub-module and DC side, but also shorten the fault recovery time, which plays a positive role in the fault protection for power electronic devices and AC system.关键词
模块化多电平换流器/双极MMC-HVDC系统/架空线/故障特性/故障保护Key words
modular multilevel converter (MMC)/bipolar MMC-HVDC system/overhead line/fault characteristics/fault protection分类
信息技术与安全科学引用本文复制引用
郭晓茜,崔翔,齐磊..架空线双极MMC-HVDC系统直流短路故障分析和保护[J].中国电机工程学报,2017,37(8):2177-2184,8.基金项目
国家重点研发计划项目(2016YFB0900904). Project Supported by the National Key Research and Development Program of China (2016YFB0900904). （2016YFB0900904）
