Research on Temperature Rise Modeling of Traction Inverter Module Based on Surrogate Model

As a key component of train traction and transmission system, inverter module temperature has an important relationship with the stability of train operation and system energy consumption. Because the inverter is a multi-disciplinary equipment with strong coupling, the temperature calculation of the module is related to the parameters of the device itself, the control strategy, the vehicle operating environment and other factors. Therefore, it is difficult to establish an exact mathematical model to describe the input-output relationship from the mechanism, which brings challenges to the analysis of its temperature characteristics. Based on the surrogate model modeling theory, this paper adopts the Kriging surrogate model to model the temperature calculation of the traction inverter with train running speed (motor speed) and traction braking force (or motor torque) as decision variables through sampling test design and surrogate model training. Finally, the accuracy of the proxy model for calculating the temperature of the inverter is verified by taking a but interval train motor speed and traction brake torque as inputs.