三电平IGBT变频器损耗分析及计算

Loss Analysis and Calculation for Three-level IGBT Inverter

文章以三电平应用为例,对IGBT器件工作过程中损耗的构成和影响因素进行分析,建立了一个适用于各种控制方式的三电平IGBT变频器损耗计算模型,其以软件仿真数据或试验数据作为输入来计算三电平拓扑中每个功率器件的损耗功率,计算值和测量值的误差在2%以内。利用该模型还可对前期产品设计进行仿真分析,精确计算系统损耗,并且根据器件损耗测试核对仿真的精确性,进而配置与之匹配的冷却系统,确保IGBT器件工作结温不超过器件要求值,并避免冷却系统的过度设计。对于不同功率器件搭建的系统,均可以参考和借鉴该方法进行系统损耗的精确计算。

Taking three-level converter application as an example, this paper analysed the components and influence factors of heat loss of working IGBT, presented an approach to calculate the heat loss of IGBT in three-level converter by different control methods, used the simulation or testing data as input to obtain heat losses of each IGBT in a three-level topology converter, and obtained a result whose error is within 2%. Furthermore, this approach can also be applied to the product design on early stage for precise computation of heat losses. With this approach, it is more likely to choose a reasonable cooling system which can guarantee that junction temperature is below permitted values and a rational redundant capacity of cooling system at the same time. Precise calculation of heat losses of the system with other power devices may refer to this paper as well.