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Improved Hybrid MMC Integrated with DC Fault Commutated Circuit
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LIANG Zhen1, WANG Yong1, BAI Haibin1, ZHANG Zhiyu1, SUN Qianhao2, CUI Bin2
Electric Drive | 2024, 54(1) : 53 - 60
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Electric Drive | 2024, 54(1): 53-60
Improved Hybrid MMC Integrated with DC Fault Commutated Circuit
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LIANG Zhen1, WANG Yong1, BAI Haibin1, ZHANG Zhiyu1, SUN Qianhao2, CUI Bin2
Affiliations
  • 1 State Grid Xinjiang Electric Power Co.，Ltd. Changji Power Supply Company，Changji 831100，Xinjiang，China
  • 2 Department of Electrical Engineering，Tsinghua University，Beijing 100084，China
Published: 2024-01-20 doi: 10.19457/j.1001-2095.dqcd24308
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Based on full-bridge（FB） and half-bridge（HB） sub-modules（SMs），the conventional hybrid modular multievel converter（MMC） is a typical topology of MMC with DC fault clearing ability. However，the proportion of FB SMs in conventional hybrid MMC is usually greater than 50%，so as to increase the cost and losses. To solve this mentioned issue，a DC fault commutated circuit based on thyristor-switched capacitor（TSC） structure in the hybrid MMC was integrated to reduce the number of FBs，the improved TSC-hybrid MMC was proposed in follows. In TSC-hybrid MMC，HB-MMCs and FB-MMCs were both retained their complete commutated body，and meanwhile，they were connected by a three-winding transformer in AC side and in series with DC side. In particularly，a thyristor-switched capacitor structure was integrated in the DC side of TSC-hybrid MMC to clear the DC fault. According to the analysis，the proportion of FB SMs in TSC-hybrid MMC can be reduced to 10%~25% or even lower （the AC-side voltage quality is a main limiting condition），the cost is reduced as well as the on-state losses. Simulation results validate the correctness of analyses.

thyristor-switched capacitor（TSC）  /  DC fault commutated circuit  /  hybrid modular multilevel converter （MMC）  /  DC fault clearing strategy  /  series converter
LIANG Zhen, WANG Yong, BAI Haibin, ZHANG Zhiyu, SUN Qianhao, CUI Bin. Improved Hybrid MMC Integrated with DC Fault Commutated Circuit[J]. Electric Drive, 2024 , 54 (1) : 53 -60 . DOI: 10.19457/j.1001-2095.dqcd24308
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Year 2024 volume 54 Issue 1
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Article Info
doi: 10.19457/j.1001-2095.dqcd24308
  • Receive Date：2022-04-12
  • Online Date：2025-11-13
  • Published：2024-01-20
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History
  • Received：2022-04-12
  • Revised：2022-07-11
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Affiliations
    1 State Grid Xinjiang Electric Power Co.，Ltd. Changji Power Supply Company，Changji 831100，Xinjiang，China
    2 Department of Electrical Engineering，Tsinghua University，Beijing 100084，China
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