南方电网技术2018，Vol.12Issue(1)：7-13,7.DOI:10.13648/j.cnki.issn1674-0629.2018.01.002
闭锁状态下MMC子模块电容充电升压机理及对策
Boosting Mechanism and Countermeasures of MMC Sub-Module Capacitor Charging in Blocking State
潘荣贞 1廖其艳 1王健1
作者信息
- 1. 荣信汇科电气技术有限责任公司,辽宁 鞍山114051
- 折叠
摘要
Abstract
Aiming at proposing improvement to the protection strategy of sub-module overvoltage bypass according to the condition that sub-module capacitors are charged in modular multilevel converter(MMC) blocking state,the phenomena that the voltage magni-tude of sound phase is raised are analyzed when a grounding fault occurs at valve side and MMC is blocked in an MMC-HVDC sym-metrical monopolar bipolar system. Because there are distributed capacitances in DC lines,the voltage of sound phase arm capacitance is raised by charging. The conditions and factors to cause and influence the charging process are presented. Then a new protection strategy to prevent mistake bypass of sub-module because of overvoltage in blocking state is proposed. Finally, simulation analysis is performed on a PSCAD model of a three-terminal MMC-HVDC system and the boosting mechanism of submodule charging in blocking state is fully verified. The proposed new protection strategy can prevent mistaken bypass of sub-module in blocking state and reduce maintenance workload of MMC.关键词
模块化多电平换流器/半桥子模块/电容电压/闭锁状态Key words
modular multilevel converter (MMC)/half bridge sub-module (HBSM)/capacitor voltage/blocking state分类
信息技术与安全科学引用本文复制引用
潘荣贞,廖其艳,王健..闭锁状态下MMC子模块电容充电升压机理及对策[J].南方电网技术,2018,12(1):7-13,7.
