Research On Thermal Design Of 12MW High-power High Voltage Inverter

In order to improve product competitiveness and satisfy the market,all inverter manufacturers are trying to minimize product dimension.This can take benefit to material cost down and save installation space for custom.But on the other hand,it cause a higher power density and we must pay more attention on heat transfer.So,it's important for manufacturer to research how to design a high quality heat transfer system for inverter to avoid over heated.Thermal analysis as an important part of electronic products design,it determines whether the equipment can work with expected heat transfer performance or not.And it also deeply influence the reliability and lifetime of product.The heat transfer system of 12MW high voltage inverter of Shanghai STEP electrical corporation has been studied in this thesis.The main contents are summarized as follows:1)Introduce the research background and significance of high voltage inverter,describe the principle of topology structure of cascaded high voltage inverter system.Analyze the working principle of main power module in inverter and how they produce power loss.Calculate the power loss value of IGBT module and diode through simulation software.2)Analyze the structure and working principle of heat pipe.Determine to use heat pipe heat sink for power unit heat transfer.At the same time,the heat pipe cooling system of power unit is simulated through ANSYS Icepak,in order to ensure the junction temperature of power module is lower than the maximum allowable junction temperature.3)Through the research and analysis of the structure,cooling method and the parameters of blower,determine to use air forced cooling for heat pipe heat sink.The requirement of air flow volume of the system is calculated.Then a type of blower is selected and the design of heat transfer system is completed.4)On the basis of power unit and cabinet design,the temperature rise of heat pipe power unit and air flow volume of cabinet are analyzed.Finally,comparing the experimental results with the simulation data,we found the numerical simulation and the experimental results are basically consistent,which verifies the accuracy of the numerical simulation.