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SU Xin,WANG Yuejiao,SHI Yu,ZHANG Hao,CHENG Yan,TENG Wei,WANG Shibo,LIU Bo,WANG Qiaoqiao,ZHANG Hailong.Configuration and Start-up Strategy of Sub-module Hybrid MMC-HVDC System for Intelligent Distribution Network[J].JOURNAL OF POWER SUPPLY,2018,16(2):95-103
Configuration and Start-up Strategy of Sub-module Hybrid MMC-HVDC System for Intelligent Distribution Network
Received:October 27, 2017  Revised:March 05, 2018
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DOI:10.13234/j.issn.2095-2805.2018.2.95
Keywords:modular multilevel converter  sub-module hybrid  system configuration  start-up strategy
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SU Xin Jinan Power Supply Company, Jinan , China
WANG Yuejiao Electric Power Research Institute, State Grid Shandong Electric Power Company, Jinan , China
SHI Yu Jinan Power Supply Company, Jinan , China
ZHANG Hao Xi'an Xuji Electric Technology Co., Ltd, Xi'an , China
CHENG Yan Electric Power Research Institute, State Grid Shandong Electric Power Company, Jinan , China
TENG Wei Electric Power Research Institute, State Grid Shandong Electric Power Company, Jinan , China
WANG Shibo Electric Power Research Institute, State Grid Shandong Electric Power Company, Jinan , China
LIU Bo Jinan Power Supply Company, Jinan , China
WANG Qiaoqiao Jinan Power Supply Company, Jinan , China
ZHANG Hailong Xi'an Xuji Electric Technology Co., Ltd, Xi'an , China
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Abstract:
      To provide a better scheme with DC fault-crossing capability for the voltage source converter based high voltage direct current(VSC-HVDC) transmission system, a novel configuration method and its matched start-up strategy are proposed for a sub-module hybrid modular multilevel converter-high voltage direct current(MMC-HVDC) system based on various sub-module hybrid MMC systems. The configuration method mainly includes two parts:one is the configuration method for the number of sub-modules, and the other is for the internal parameters of sub-modules. The first configuration method can save economic cost and reduce system loss while making the converter have the DC fault-crossing capability and improving the system capacity; the second can limit the voltage variation of the full-bridge sub-module during the crossing process and guarantee the normal operation of fault-crossing. Since different sub-modules adopt different capacitors, the start-up strategy for the traditional MMC-HVDC system is not applicable, thus a novel start-up strategy is proposed to match the configuration method. Finally, a simulation model of a two-terminal MMC-HVDC transmission system is constructed in Matlab/Simulink, and simulation results show that the novel configuration method and the corresponding start-up strategy are feasible and effective.
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