中国电机工程学报2017，Vol.37Issue(23)：6901-6909,9.DOI:10.13334/j.0258-8013.pcsee.162106
单变压器分区互联装置接地故障特性研究及控制保护策略设计
Characteristic Investigation and Control of Single Transformer Interconnecting Device Under Grounding Fault Condition
摘要
Abstract
Modular multilevel converter (MMC) based interconnecting device has a promising future in open-loop for urban electromagnetic loop.This paper mainly studies fault characteristic of single transformer interconnecting device under ac and de grounding fault.In view of zero sequence voltage caused by the single line to ground fault at transformerless side,the impact of zero sequence voltage to fault ride though strategy was analyzed and zero sequence voltage controller was proposed,which could reduce overvoltage level in the dc side.In view of DC bias in the AC current caused by the DC pole to ground fault,fault mechanisms were analyzed and mathematic expression of fault components were derived.Control and protection scheme was proposed based on bypassing submodule or closing submodule bypass switch.Simulation results based on a PSCAD/EMTDC model prove the control and protection scheme is validity.关键词
单变压器/模块化多电平换流器/分区互联装置/直流单极接地故障/交流单相接地故障/控制保护策略Key words
single-transformer/modular multilevel converter/interconnecting device/DC pole-to-ground fault/single-line-to-ground fault/control and protection scheme分类
信息技术与安全科学引用本文复制引用
周杨,尹昌新,贺之渊,杨杰,黄仁乐,常乾坤..单变压器分区互联装置接地故障特性研究及控制保护策略设计[J].中国电机工程学报,2017,37(23):6901-6909,9.基金项目
国家863高技术基金项目(2015AA050102).The National High Technology Research and Development of China 863 Program(2015AA050102). （2015AA050102）
