电力汽车功率变换器冷却优化仿真研究  

Simulation of Cooling System Optimizing of Power Converter for Electric Vehicle

作　　者：叶敏[1] 皇甫艳芳[1] 

机构地区：[1]长安大学公路养护装备国家工程实验室,陕西西安710064

出　　处：《计算机仿真》2015年第9期189-193,共5页Computer Simulation

基　　金：国家自然科学基金项目(51105043)

摘　　要：电动汽车功率变换器经常工作在高电压、大电流状态,极易发生高温烧毁。随着路况和驾驶工况的复杂多变性,导致变换器的热源具有随机性、突变性和电流方向正负交替变换控制困难。提出采用流固共轭仿真研究技术对功率变换器的驱动和制动工况下的热力学现象进行优化仿真研究。通过实验测试电动汽车驱动和再生制动工况下功率变换器中IGBT的电流,计算了IGBT的热损耗。利用Ansys Workbench有限元软件对IGBT冷却的流固共轭传热问题进行了三维建模,通过UDF模块导入了IGBT的热源。研究不同热源功率IGBT和不同散热片结构尺寸下流体域的空间温度分布,分析其对IGBT冷却效果的影响,提出合理的设计参数,为电动汽车功率变换器热管理系统的优化设计奠定基础。The power converter of an electric vehicle often works on the condition of high voltage and large cur- rent, resulting in the frequency over temperature danger. With the variation of the road condition and the driving style, the converter loads dominate the randomicity, mutability and the period change of the current direction. To im- prove the thermal stability and reliability of the power converter of an electric vehicle, the fluid-solid conjugate ther- mal transfer was simulated. The currents of the IGBT during the driving and regenerative braking conditions were test- ed, further the thermal loss of the IGBT was calculated. By Ansys Workbench software, a three dimensional model were established based on the conjugate thermal transfer phenomenon. By the UDF module, the boundary conditions of the IGBT were introduced into the simulation model. The temperature fields of the fluid domain were studied under different cooling wind velocity and the thermal sink sizes. The affection laws were analyzed, then the reasonable de- sign parameters were given out, which provides a base for the optimization design of the thermal managing system of the power converter of electric vehicle.

关 键 词：功率变换器 共轭传热 通风冷却 温度场 

分 类 号：TU52[建筑科学—建筑技术科学]