Hybrid Topology of Modular Multilevel Converter with DC Fault Blocking Capability

doi:10.11930/j.issn.1004-9649.201711180

Abstract

Abstract: When reverse blocking MMC (RBSM-MMC) topology process fault current at DC side, huge overvoltage occurs in the lower tube reverse blocking IGBT. The block needs to meet very high pulse blocking consistence requirement in order to avoid components burning down due to huge overvoltage across IGBT. A hybrid model of RB and HB MMC (RB-HBSM-MMC) is proposed to resolve the problem of fault blocking capacity of traditional MMC and RBSM-MMC triggering consistence and spike voltage. Based on analysis of hybrid topology structure and fault blocking mechanism, a double-ends MMC-HVDC system is set up on PSCAD/EMTDC simulation platform. Simulation result shows that proposed RB-HBSM-MMC can effectively block DC-side fault current and isolate fault. Compared to RBSM-MMC, RB-HBSM-MMC can realize both effective blocking of DC-side fault current and transfer transient spike voltage to resolve overvoltage, reduce technical requirement for consistence of system triggering. It has good prospect of application.

Key words: modular multilevel converter, reverse blocking, hybrid topology, fault clearance, trigger synchronization, high voltage flexible DC transmission

CLC Number:

TM721.1

LUO Yinghong, XU Yijia, SHI Tongtong, LIU Yunhua. Hybrid Topology of Modular Multilevel Converter with DC Fault Blocking Capability[J]. Electric Power, 2018, 51(5): 1-9.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201711180

https://www.electricpower.com.cn/EN/Y2018/V51/I5/1

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