Three-Dimensional Frequency Thermal Network Model of Reactor Under High Power and High Frequency Square Wave Voltage

Abstract

To quickly calculate the stable temperature of the reactor under the high power and high frequency square voltage, a three-dimensional frequency thermal network model suitable for the reactor is established in this paper. In power electronic equipment, the reactors usually have to work near their thermal limit margins. Moreover, with the increasing demand of the high power density in power electronic devices, the structure design of the reactor is more compact, it is difficult for reactor to work in appropriate temperature. Therefore, an efficient initial thermal analysis of the reactor is essential. Generally, its stable temperature could be analyzed by the thermal network modeling methods and heat transfer analysis tool. The latter needs consume massive computation time. Therefore, a thermal network model of the reactor is established by considering the three-dimensional effect of the core and the effect of the high frequency repeated pulse stress on the thermal penetration depth. According to the reactor temperature hot spots, accuracy and calculation amount, 12 nodes are considered in the proposed thermal network model. In order to verify the feasibility of the thermal network model, the corresponding multi-physical field finite element simulation is built. The finite element simulation results show that the proposed thermal network model has high precision and fast calculation speed.