首页|Thyristor-inserted MMC Sub-module Topology with DC Fault Blocking Capability
Thyristor-inserted MMC Sub-module Topology with DC Fault Blocking Capability
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Modular multilevel converter(MMC)is increasingly being applied to high voltage direct current(HVDC)systems.However,dc short circuit situations restrain the application of a conventional half bridge MMC system.In this paper,a new sub-module topology with inserted thyristor can help the MMC system clear a dc side fault.Working states and devices voltage stress of the proposed topology are analyzed and the conduction loss comparison between the proposed topology with several existing topologies with dc fault blocking capability is carried out.Results show the proposed topology is superior to other topologies in terms of conduction loss while using the same voltage rating devices.Besides,compared with traditional half bridge topology,only thyristors and diodes are added in the proposed topology.Therefore,cost of the proposed topology can be lower than conventional hybrid MMC sub-modules.At last,the fault blocking capability of the proposed topology is verified in the simulation.
Fault current limitinghigh voltage direct current(HVDC)transmissionmodular multilevel converter(MMC)
Cheng Peng、Rui Li、Xu Cai
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Key Laboratory of Control of Power Transmission and Conversion,Shanghai Jiao Tong University,Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China
National Key R&D Program of ChinaNational Natural Science Foundation of China
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