电力工程技术2026，Vol.45Issue(1)：72-82,11.DOI:10.12158/j.2096-3203.2026.01.007
低全桥比例混合型MMC换流器直流故障穿越方法
DC fault ride-through method of hybrid MMC with low FBSM ratio
摘要
Abstract
The modular multilevel converter(MMC)is widely used in flexible direct current projects.The fault clearance speed of hybrid MMCs is closely related to the proportion of full bridge sub-modules(FBSMs).To address the issue of sub-module overvoltage caused by unbalanced energy absorption between half bridge sub-modules(HBSMs)and FBSMs during the clearance of a bipolar short-circuit fault,this paper designs an energy-assisted isolation branch suitable for hybrid MMCs with a low FBSM ratio.By bypassing the HBSMs before blocking,the energy released by the submodules is reduced,thereby lessening the transient energy absorption burden on the FBSMs and suppressing FBSM overvoltage.To shorten the fault clearance time,this paper proposes a dual-branch coordinated operation strategy.A transient energy absorption branch is connected in parallel at the port side to assist in absorbing the fault's transient energy and accelerate fault clearance.A two-terminal hybrid MMC-based flexible direct current transmission system model is built on the PSCAD/EMTDC platform to verify the effectiveness of the proposed scheme.Simulation results show that the proposed dual-branch coordinated operation strategy can effectively suppress sub-module overvoltage,shorten the fault clearance time,and reduce the operational cost associated with rapid self-clearing of faults in hybrid MMCs.关键词
模块化多电平换流器(MMC)/故障穿越/子模块过电压/故障暂态能量/加速故障清除/双支路协同运行策略Key words
modular multilevel converter(MMC)/fault ride-through/sub-module overvoltage/fault transient energy/accelerate fault clearance/dual-branch cooperative operation strategy分类
信息技术与安全科学引用本文复制引用
刘晨旭,何柏娜,冯汝明,高磊,李祖元,代维汉..低全桥比例混合型MMC换流器直流故障穿越方法[J].电力工程技术,2026,45(1):72-82,11.基金项目
山东省自然科学基金资助项目(ZR2021ME057)本文得到山东省研究生优质教育教学资源项目(SDYAL2022114)资助,谨此致谢! （ZR2021ME057）
