Modelling and simulation of induction machine and frequency converter considering power losses

This paper presents the options for determining power losses in the system consisting of indirect frequency converter and induction machine. A mathematical model for calculation of individual losses in machine as well as in converter is presented herein. The model allows the determination of losses both in steady states and in the course of transients, e.g. starting, braking, load change. The model also applies to motoric and generatoric modes of the machine. The presented model is subsequently verified by means of simulation experiments in the program MATLAB-SIMULINK. The simulated curves document the principal correctness of the calculations presented.