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As power systems increasingly exhibit the development trend and key characteristics of high-penetration renewable energy integration and high-penetration power electronics, the multi-timescale coupling transients in electromagnetic transient (EMT) simulations have become significantly more complex. Consequently, EMT simulation faces dual challenges in both accuracy and efficiency. This paper addresses the multi-timescale issue in the EMT simulation of modular multilevel converters (MMCs), which are critical components in high-voltage direct current (HVDC) transmission systems. A co-simulation approach is implemented within PSCAD/EMTDC, utilizing a Thévenin equivalent model alongside a custom-built device-level model. This combination forms an MMC simulation model operating at the nanosecond timescale. The proposed co-simulation framework substantially enhances the simulation speed of the device-level model while accurately capturing both the internal transient characteristics and external behaviors of the MMC submodules. These results further demonstrate the effectiveness of the proposed model in achieving a balance between simulation accuracy and efficiency within the multi-timescale context.

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Multi-timescale Modeling and Co-Simulation for Modular Multilevel Converter

  • 会议论文

  • 发表日期：

    2026年

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  • Zijie Meng,
  • Jianzhong Xu,
  • Shuhao Cao,
  • Bin Yuan,
  • Zezhou Chang,
  • Liming Bo,
  • Yueshuang Bao

摘要

As power systems increasingly exhibit the development trend and key characteristics of high-penetration renewable energy integration and high-penetration power electronics, the multi-timescale coupling transients in electromagnetic transient (EMT) simulations have become significantly more complex. Consequently, EMT simulation faces dual challenges in both accuracy and efficiency. This paper addresses the multi-timescale issue in the EMT simulation of modular multilevel converters (MMCs), which are critical components in high-voltage direct current (HVDC) transmission systems. A co-simulation approach is implemented within PSCAD/EMTDC, utilizing a Thévenin equivalent model alongside a custom-built device-level model. This combination forms an MMC simulation model operating at the nanosecond timescale. The proposed co-simulation framework substantially enhances the simulation speed of the device-level model while accurately capturing both the internal transient characteristics and external behaviors of the MMC submodules. These results further demonstrate the effectiveness of the proposed model in achieving a balance between simulation accuracy and efficiency within the multi-timescale context.