Scholarlink

<p>This article proposes a mission-profile-based sizing methodology for DC-link capacitors in eVTOL propulsion inverters. While DC-link capacitors contribute significantly to converter volume, traditional design relies on conservative worst-case operating points, leading to significant oversizing. To address this, an electro-thermal modelling approach is developed to evaluate capacitor lifetime based on core temperature fluctuations throughout a dynamic flight profile. The methodology accounts for thermal properties, modulation strategies, and the effects of fault-tolerant operation. Although the method is applicable to various inverter topologies and capacitor technologies, the three-level T-type (3L-TT) fault-tolerant converter benefits most, as demonstrated by an exemplary design achieving a 37.5% reduction in DC-link volume compared to conventional methods while for a specified life-time goal.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Reliability-driven DC-link optimization for fault-tolerant 3L T-type eVTOL propulsion inverters

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月28日

查看全文
  • Niklas Krug,
  • Marek Galek,
  • Florian Holzapfel

摘要

This article proposes a mission-profile-based sizing methodology for DC-link capacitors in eVTOL propulsion inverters. While DC-link capacitors contribute significantly to converter volume, traditional design relies on conservative worst-case operating points, leading to significant oversizing. To address this, an electro-thermal modelling approach is developed to evaluate capacitor lifetime based on core temperature fluctuations throughout a dynamic flight profile. The methodology accounts for thermal properties, modulation strategies, and the effects of fault-tolerant operation. Although the method is applicable to various inverter topologies and capacitor technologies, the three-level T-type (3L-TT) fault-tolerant converter benefits most, as demonstrated by an exemplary design achieving a 37.5% reduction in DC-link volume compared to conventional methods while for a specified life-time goal.