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The modular multilevel converter (MMC) valve is the core equipment of High Voltage Direct Current (HVDC) transmission system and typically applies Insulated Gate Bipolar Transistors (IGBTs) as its switching devices. With the increasing demand for MMC-HVDC applications, the Integrated Gate-Commutated Thyristor (IGCT) has garnered significant research interest due to its high withstand current, high blocking voltage, and low on-state losses. Therefore, this paper explores the application of IGCT-based sub-module in MMC. By comparing and analyzing the differences between IGCT and IGBT devices, a novel IGCT-based sub-module topology for MMC is designed. Furthermore, this paper proposes a method for selecting key components of the IGCT-based MMC and introduces a compatible control strategy. Using the Nan’ao multi-terminal MMC-HVDC project as a case study, a simulation of a hybrid system combining IGCT sub-modules and IGBT sub-modules is implemented. The simulation results validate the rationality and effectiveness of the component selection and control strategy for the MMC valve using hybrid IGCT and IGBT sub-modules.

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Application Design and Simulation of Hybrid IGCT Sub-module and IGBT Sub-module for Modular Multilevel Converter

  • 会议论文

  • 发表日期：

    2026年

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  • Yan Xiong,
  • Wei Wei,
  • Yuebin Zhou,
  • Junsong Li,
  • Chang Cui,
  • Xinxin Chen

摘要

The modular multilevel converter (MMC) valve is the core equipment of High Voltage Direct Current (HVDC) transmission system and typically applies Insulated Gate Bipolar Transistors (IGBTs) as its switching devices. With the increasing demand for MMC-HVDC applications, the Integrated Gate-Commutated Thyristor (IGCT) has garnered significant research interest due to its high withstand current, high blocking voltage, and low on-state losses. Therefore, this paper explores the application of IGCT-based sub-module in MMC. By comparing and analyzing the differences between IGCT and IGBT devices, a novel IGCT-based sub-module topology for MMC is designed. Furthermore, this paper proposes a method for selecting key components of the IGCT-based MMC and introduces a compatible control strategy. Using the Nan’ao multi-terminal MMC-HVDC project as a case study, a simulation of a hybrid system combining IGCT sub-modules and IGBT sub-modules is implemented. The simulation results validate the rationality and effectiveness of the component selection and control strategy for the MMC valve using hybrid IGCT and IGBT sub-modules.