This paper analyzes the influence of a DC-link capacitor under open-switch failures in hybrid active neutral point clamped (ANPC) inverters that consist of Si-IGBTs and SiC-MOSFETs. Open-switch failures cause the current harmonic distortion of DC-link capacitors. This distorted current affects the capacitor loss increase, which in turn affects the lifetime decrement of the DC-link capacitor. These influences of open-switch failures on inverter operation have not been discussed despite the fact that they lead to secondary failures of the system. In this paper, the influence of open-switch failure is analyzed based on the current harmonics of the DC-link capacitor, which experiences the highest failure rate. Simulation and experimental results demonstrate the effects of various open-switch failure scenarios on DC-link capacitors in terms of current harmonics and lifetime.

本文分析了由 Si-IGBT 和 SiC-MOSFET 组成的混合有源中性点钳位 (ANPC) 逆变器在开路开关故障下直流母线电容器的影响。开路开关故障会导致直流母线电容器的电流谐波失真。这种失真的电流会影响电容器损耗的增加，进而影响直流母线电容器的寿命缩短。这些开路故障对逆变器运行的影响尚未讨论，尽管它们会导致系统的二次故障。在本文中，基于故障率最高的直流母线电容器的电流谐波分析了开路开关故障的影响。