Scholarlink

DC-link capacitors are the core component of flexible DC transmission converter valve, and their service reliability directly determines the safe and stable operation of flexible DC transmission equipment. The material properties and coating design of metallized thin films directly affect the insulation performance and safety margin of capacitors. This article discusses the evaporation of different thin film materials into various metallized thin films and the preparation of components using these films, both domestically and internationally. It conducts aging test research under different voltage, temperature, and harmonic superposition conditions. The experimental results show that an increase in temperature and harmonics leads to a significant increase in self-healing in component durability tests, resulting in capacitor capacity attenuation or self-healing failure. The design of metallized film plating with high square resistance and safety segmentation film can effectively compensate for the lack of temperature resistance of the raw material itself, improving the insulation margin and safety reliability of the capacitor.

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Study on the Aging Performance of DC Capacitor Components with Different Plating Designs of Metallized Thin-Film Materials

  • 会议论文

  • 发表日期：

    2026年

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  • Shaowei Guo,
  • Zhaoliang Xing,
  • Chong Zhang,
  • Bo Yang,
  • Yaotian Su,
  • Juyang Liu,
  • Shuting Zhang

摘要

DC-link capacitors are the core component of flexible DC transmission converter valve, and their service reliability directly determines the safe and stable operation of flexible DC transmission equipment. The material properties and coating design of metallized thin films directly affect the insulation performance and safety margin of capacitors. This article discusses the evaporation of different thin film materials into various metallized thin films and the preparation of components using these films, both domestically and internationally. It conducts aging test research under different voltage, temperature, and harmonic superposition conditions. The experimental results show that an increase in temperature and harmonics leads to a significant increase in self-healing in component durability tests, resulting in capacitor capacity attenuation or self-healing failure. The design of metallized film plating with high square resistance and safety segmentation film can effectively compensate for the lack of temperature resistance of the raw material itself, improving the insulation margin and safety reliability of the capacitor.