基于热力仿真的变流器散热系统数值计算

Numerical Calculation of Converter Cooling System Based on Thermal Simulation

电力电子设备不断提高的集成度和功率密度,对电力电子设备冷却系统的设计提出了新要求。目前在电力电子设备的散热设计研究中,仍存在热阻计算过程不完善、计算结果缺乏验证手段以及风机选型不合理等问题。以脉冲宽度调制(PWM)变流器散热系统为例,提出更为完善的散热系统热设计流程,对散热器热阻的计算和风机的选型给出详细的计算过程,并采用热仿真软件搭建仿真模型,对热阻、温度和流体速度进行仿真分析,最后通过试验平台进行温度数据的测试。结果表明,计算、仿真、实测数据有较好的一致性,满足设计要求。

With the increasing integration of power electronics and power density the new requirements are placed on the design of power electronics cooling systems.At present,there are some researches on the heat dissipation design of power electronic equipment,but there are still some problems in the calculation of thermal resistance,the lack of verification methods for thermal resistance calculation and the unreasonable selection of fans.Taking the design of the PWM converter cooling system as an example,a more complete thermal design process of the heat dissipation system is proposed.The calculation process of the heat resistance of the radiator and the selection of the fan are given.The simulation model is built by thermal simulation software.The resistance,temperature and fluid velocity are simulated and analyzed.Finally,the test platform is built to test the temperature data.The results show that the calculation,simulation and measured data have good consistency and meet the design requirements.