Control system of temperature of locomotives traction frequency converters

The features of the control systems temperature traction frequency converters consisted rectifier, capacitor and voltage source inverter for rolling stock are discussed. induction motor is considered as a load converter. dependence number thermal cycles from semiconductor junction fluctuations before failure device shown. topology operation principle automatic system devices converter developed described. based on air forced cooling with use fan or blower an executive regulation device. main feature proposed additional reference switching that allows to reduce fluctuations. elements loop chosen evaluated, recommendations practical implementations given. Simulation in Matlab both references its fluctuation was carried out all essential nonlinearities motors taken into account. Results simulation included