Active thermal optimization control method and device of electromobile driving system

The invention discloses an active thermal optimization control method and device of an electromobile driving system. The method comprises the following steps of calculating total loss of an inverter according to real-time data of the inverter; obtaining a first junction temperature value and a second junction temperature value of an inverter equivalent thermal resistance network according to the total loss and an inverter thermal resistance model; obtaining a first switching frequency according to the first junction temperature value, a first safe temperature limit value and a hysteresis comparator; simultaneously obtaining a second switching frequency according to the second junction temperature value, a second safe temperature limit value and the hysteresis comparator; and selecting the smaller one of the first switching frequency and the second switching frequency as the switching frequency of the electromobile driving system. According to the method, a current-type quasi-Z source inverter is adopted, and the problem of active thermal optimization control of the inverter on an actual heat constraint condition is solved by adjusting the shoot-through duty ratio of the inverter, the switching frequency and a control signal output from a space vector pulse width modulator.