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An improved modulation strategy for CDSM topology switching loss uneven
Received:October 27, 2018  Revised:January 22, 2019
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Keywords:CDSM  Uneven loss  Improved modulation strategy
Fund Project:The Fundamental Research Funds for the Central Universities
LiQing China Southern Power Grid Super High Voltage Transmission Company Maintenance Test Center liqing6291@163.com
SongYonghui School of Electrical Engineering, Chongqing University 775426517@qq.com
luoyongjie School of Electrical Engineering, Chongqing University luoyj@cqu.edu.cn
彭光强 pengguang_qiang@163.com
武霁阳 64063479@qq.com
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      In order to realize the bi-polar short-circuit fault clear of the flexible DC system, many sub-module topologies with fault blocking capability have been proposed, such as the clamped double sub-module (CDSM). Because the new sub-module structure is different from the half-bridge sub-module (HBSM), its modulation strategy is not fully applicable. Based on the traditional recent level modulation strategy (NLM), this paper proposes an NLM strategy for CDSM. There are two kinds of output UC level settings for this topology, and an improved NLM modulation strategy is designed., can effectively avoid the power loss unevenness caused by different device conduction probability. Finally, taking CDSM topology as an example, the CDSM-MMC simulation model is used in PSCAD/EMTDC software to verify the correctness of the proposed modulation strategy.