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This chapter presents a Multi-Level Coordinated Control (MLCC) scheme specifically designed for symmetrical bipolar OWF-MMC-HVDC systems. The MLCC scheme utilizes the energy control capabilities of MMCs to address DC overcurrents resulting from submarine cable failures. The scheme is organized into four control levels, each targeting a specific aspect of system response: Offshore Fault Pole MMC: When a DC submarine cable breakage is detected, the fault pole MMC at the offshore converter station begins passive power absorption from the wind farms using its internal SM capacitors. This provides a critical time buffer for subsequent control actions to be implemented. Onshore Non-Faulty Pole MMC: At the second level, the non-faulty pole MMC at the onshore converter station actively adjusts DC voltage to suppress potential DC overcurrents. Offshore Non-Fault Pole MMC: The third level involves the non-fault pole MMC at the offshore converter station, which dynamically balances DC power flow based on real-time power input from the wind farms. Offshore Wind Farms: The fourth level focuses on the offshore wind farms, which reduce their power output to bring submarine cable transmission parameters back within acceptable limits. The effectiveness and accuracy of the proposed MLCC scheme across various scenarios are rigorously validated through PSCAD/EMTDC simulations.

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Characteristics Analysis and Suppression of DC Submarine Cable Disconnection Fault

  • 章节

  • 发表日期：

    2025年

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  • Wei Yao,
  • Hongyu Zhou,
  • Yongxin Xiong,
  • Jinyu Wen

摘要

This chapter presents a Multi-Level Coordinated Control (MLCC) scheme specifically designed for symmetrical bipolar OWF-MMC-HVDC systems. The MLCC scheme utilizes the energy control capabilities of MMCs to address DC overcurrents resulting from submarine cable failures. The scheme is organized into four control levels, each targeting a specific aspect of system response: Offshore Fault Pole MMC: When a DC submarine cable breakage is detected, the fault pole MMC at the offshore converter station begins passive power absorption from the wind farms using its internal SM capacitors. This provides a critical time buffer for subsequent control actions to be implemented. Onshore Non-Faulty Pole MMC: At the second level, the non-faulty pole MMC at the onshore converter station actively adjusts DC voltage to suppress potential DC overcurrents. Offshore Non-Fault Pole MMC: The third level involves the non-fault pole MMC at the offshore converter station, which dynamically balances DC power flow based on real-time power input from the wind farms. Offshore Wind Farms: The fourth level focuses on the offshore wind farms, which reduce their power output to bring submarine cable transmission parameters back within acceptable limits. The effectiveness and accuracy of the proposed MLCC scheme across various scenarios are rigorously validated through PSCAD/EMTDC simulations.