高电压技术2025，Vol.51Issue(2)：538-546,9.DOI:10.13336/j.1003-6520.hve.20241071
远距离大容量特高压柔性直流受端续流过电压机理及抑制策略
Continuous Overvoltage Mechanism and Suppression Strategy of Inverter Station of Long Distance and Large Capacity VSC-UHVDC System
摘要
Abstract
The VSC-UHVDC system contains a large number of energy storage components,which is prone to serious continuous overvoltage when the inverter station is locked due to a ground fault.In order to avoid serious reverse current overvoltage hazards to the safety of equipment and system,the fault characteristics of the long distance VSC-UHVDC system under typical fault conditions such as faults on the valve side of transformer and±400 kV busbar are analyzed,the mechanism of continuous overvoltage is studied,the influences of the continuous voltage are evaluated,and some measures to suppress overvoltage are proposed.The research indicates that the optimal configuration scheme of arrester can effectively reduce the continuous voltage,which can reduce the overvoltage of the upper bridge arm of high voltage converter by 38%and the overvoltage between the terminals of high voltage converter valve by 29%.The auxiliary con-trol strategy can effectively reduce the stress of high energy arrester by more than 30%.The transient simulation model on the PSCAD/EMTDC is built to verify the correctness of overvoltage mechanism and the effectiveness of overvoltage suppression measures.The results can provide theoretical supports for the construction of the first batch of VSC-UHVDC projects in China,and are beneficial to ensuring the safety of DC system operation.关键词
特高压柔性直流/续流过电压/影响因素/避雷器配置/故障特性/抑制策略Key words
VSC-UHVDC/continuous overvoltage/influence/arrester configuration/fault characteristics/suppression strategy引用本文复制引用
徐莹,樊林禛,李探,苑宾,赵峥,邹铁锐..远距离大容量特高压柔性直流受端续流过电压机理及抑制策略[J].高电压技术,2025,51(2):538-546,9.基金项目
国家电网有限公司总部管理科技项目(超长特高压柔性直流功率不平衡暂态冲击平抑关键技术研究)(5200-202456113A-1-1-ZN).Project supported by Science and Technology Project of SGCC(Research on the Key Technology of Suppression of Transient Impulse of Long Distance VSC-UHVDC)(5200-202456113A-1-1-ZN). （超长特高压柔性直流功率不平衡暂态冲击平抑关键技术研究）
