电工技术学报2018，Vol.33Issue(4)：730-738,9.DOI:10.19595/j.cnki.1000-6753.tces.161125
UHVDC分极分层接入方式及其运行特性
The Connection Mode and Operation Characteristics of UHVDC with Hierarchical Connection by Pole
摘要
Abstract
Based on the existing hierarchical connection mode, this paper puts forward a new hierarchical connection mode by pole. Firstly, according to the two hierarchical connection modes of ultra high voltage direct current (UHVDC) transmission system connecting to the receiving grid. the economic, multi-infeed short circuit ratio indexes are compared and analyzed. Then based on the PSCAD/EMTDC simulation platform, the simulation systems for 800kV UHVDC transmission system connecting to 500kV/1 000kV receiving grid are built. Finally, the steady-state, dynamic and transient characteristics of two connection modes are compared. The results show that the hierarchical connection mode by pole can not only effectively improve the multi-infeed short circuit ratio (MISCR) of receiving grid and enhance the voltage supporting ability, but also has good static and dynamic responses. More importantly, the hierarchical connection mode by pole can achieve the layered isolation of commutation failure and improve the reliability of UHVDC. The disadvantage of hierarchical connection mode by pole is that grounding current is too large when monopolar total outage or bipolar power is unbalanced. In this regard, this paper proposes the measures to suppress ground electrode current.关键词
特高压直流/分极分层接入方式/多馈入短路比/换相失败/分层隔离/故障恢复Key words
Ultra high voltage direct current (UHVDC)/hierarchical connection by pole/multi-infeed short circuit ratio (MISCR)/commutation failure/layered isolation/fault recovery分类
信息技术与安全科学引用本文复制引用
王玲,文俊,司瑞华,蔚泽,刘连光..UHVDC分极分层接入方式及其运行特性[J].电工技术学报,2018,33(4):730-738,9.基金项目
国家自然科学基金(51577060)和高等学校学科创新引智计划("111"计划)资助项目. （51577060）
