Design And Simulation Of Liquid Cooling Cold Plate Of Wind Power Converter For Megawatt

With the rapid development of wind power converter technology in the world, the power level of wind power converter is greatly improved, and the power level of the wind power converter will increase the temperature rise of the IGBT module, which will directly threaten the stability of wind power converter. Especially for MW level wind power converter with very large heat power device, it is very important to take reasonable and effective cooling method.First, in this paper, Aiming at the problem of heat dissipation of MW level wind power converter,analyzes the various cooling methods, and puts forward the cooling plate heat dissipation. According to the related theory and heat transfer mechanism of liquid cold plate design, two kinds of traditional cold plate flow channel are optimized and improved. Four kinds of new cold plate flow channel : S-type flow channel with fins, S-type flow channel with middle entrance port, two kinds of S-type flow channel of sequential fins are designed.Secondly, through the theory of fluid mechanics, the flow resistance and the local resistance of different flow channel structures are analyzed, and the mathematical equations of the loss and the local loss of the different channels are established. Using CFD to simulate the pressure loss of six kinds of channel structure, the distribution of velocity field and pressure field in the flow channel is obtained,and the theoretical values and simulation values are compared.Thirdly, according to the theory of heat transfer, the mathematical equation of the convective heat transfer in the cold plate is established, and the temperature distribution of the cold plate and IGBT module is obtained by using the ICEPAK software to simulate the convection heat transfer of six kinds of channel structure. The comprehensive performance of the six channel structures is analyzed. The results show that under the same inlet velocity and inlet water temperature: the S-type flow channel with fins and of sequential fins(structure one) heat transfer performance are the best; In the middle of the inlet of the S type flow channel temperature is relatively high, but the pressure loss, but the pressure loss is higher, but the pressure loss is minimum. The comparison analysis shows that S-type flow channel with fins is the best.At last, The experimental tests of the cold plate test platform, the flow performanceand the convective heat transfer performance of the cold plate are carried out. The experimental results and simulation results are compared to verify the reliability of the results of this paper.