风电变流器电容部件散热分析及仿真优化

针对某1.5 MW Freqcon变流器的电容系统的散热问题,建立了几何结构模型,在热分析理论的基础上,采用ICEPAK软件,对存在问题的电容冷却系统的温度场、速度场进行了三维仿真分析。研究发现在柜体最上端和最下端存在涡流区域,导致电容系统散热性能降低。为解决问题,提出了两种优化方案,并进行了比较分析,最后将方案二应用到实际运行中,结果表明:方案一去掉产生涡流部分的风道,可以在一定程度上减少涡流区域产生。方案二在方案一的基础上,利用ICEPAK的优化功能,优化参数,得出优化的最小风量为0.408m3/s,并且在该风量下电容器表面传热系数较高。实际运行结果与方案二模拟结果基本一致,并为风电变流器实际运行中的风道优化和电容散热提供一定的参考。

Thermal Analysis and Simulation Optimization of Capacitive Components in Wind Power Converter

For a heat problem of the 1.5MW Freqcon converter capacitor system,a geometric model is established.Basing on thermal analysis theory and using ICEPAK software,simulationed the temperature and velocity field of the capacitance cooling system which had problem already.The results indicate that due to the eddy current region in the top and bottom of the cabinet,the heat dissipation of the capacitance system is reduced.To solve this problem,we proposed two solutions and compared,then the scheme 2 was applied to the actual operation,the calculation results show that:the scheme 1 removed the eddy current duct can reduce the eddy current region to some extent.And on the basis of the scheme 1, the scheme 2 used the optimization function of the ICEPAK,optimizationed the parameters,found the minimum air volume is 0.408m3/s.And in this air volume,the capacitor surface heat transfer coefficient is higher.The practical operation results and simulation results of the scheme 2 are basically consistent. And this scheme provides a reference for the optimization of air-duct and the heat dissipation of the capacitor in wind power converter actual operation.