Reaseach on the Topology of MMC With DC Fault Isolating Capability

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Reaseach on the Topology of MMC With DC Fault Isolating Capability

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[1]Zhang Qingzhi,Li Zhihui.Reaseach on the Topology of MMC With DC Fault Isolating Capability[J].Journal of Zhengzhou University (Engineering Science),2017,38(06):74-78.[doi:10.13705/j.issn.1671-6833.2017.06.011]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 38 Number of periods: 2017 06 Page number: 74-78 Column: Public date: 2017-11-20

Title:: Reaseach on the Topology of MMC With DC Fault Isolating Capability

Author(s):: Zhang Qingzhi1; Li Zhihui2; 1. School of Mechanical and Electrical Engineering, Xinxiang University, Xinxiang, Henan, 453003; 2. School of Electrical Engineering, Zhengzhou University, Zhengzhou, Henan, 450001

Keywords:: flexible HVDC; dc faults; MMC; sub module topology; sub module capacitor voltage

CLC:: -

DOI:: 10.13705/j.issn.1671-6833.2017.06.011

Abstract:: To solve the MMC-HVDC dc-fault, a new sub-module topology with DC faults blocking capability is proposed, which could be used to block the fault current by its structure characteristic. On this basis, in order to restrain the adverse effects of sub-module capacitor voltage rising during the fault time, a new self-break sub-module topology with a damping resistor is proposed. The topology not only can block fault current, but also has sub-module capacitor voltage suppression effect. An 9 level SBMMC-HVDC simulation model is built in PSCAD / EMTDC platform, and the simulation proves the proposed new topology is correct.

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