The power density and reliability of the inverter can be improved with reduced DC-link capacitance by swing bus operation, etc. With insufficient DC-link capacitance, a double line frequency voltage ripple will be superimposed on the DC link, but how this voltage ripple affects the power loss of the IGBT in the inverter system has been seldom discussed. This paper analyzes the influence of voltage fluctuations on the power loss of IGBT and establishes the characteristic database of IGBTs under different operating voltages and currents using a dynamic test chamber. A switching profile-based power loss model has been proposed to evaluate the power loss of IGBT in the single-phase inverter under different DC link voltage ripples. All the theoretical analysis has been verified by a 6-kW inverter platform under swing bus operation (SBO).

中文翻译：

---

基于 IGBT 功率损耗建模的摇摆母线运行逆变器直流母线电容优化


通过摆动母线操作等减少直流母线电容，可以提高逆变器的功率密度和可靠性。如果直流母线电容不足，则会在直流母线上叠加双工频电压纹波，但这种电压纹波是如何产生的？逆变器系统中IGBT功率损耗的影响很少被讨论。本文分析了电压波动对IGBT功率损耗的影响，并利用动态试验箱建立了不同工作电压和电流下IGBT的特性数据库。提出了一种基于开关曲线的功率损耗模型来评估不同直流母线电压纹波下单相逆变器中 IGBT 的功率损耗。所有理论分析均已在摆动母线运行（SBO）下的 6 kW 逆变器平台上得到验证。