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The simulation model of the inverter based on switching function concept is studied and the open faults of switching device in the inverter are considered, the actual implementation of these models under different fault conditions are proposed with the help of MATLAB/SIMULINK. Using mathematical model of the induction motor, the s-function of the motor is written. Only to change the switching function block, the simulation can be done conveniently for inverter with different fault mode. The simulation results show that the stator current can be used for fault detection and diagnosis for inverter-fed motor drive system.

Aiming at the power device open and close faults occurred in the inverter, GUI based simulation platform for inverter drive system under fault condition is studied primarily in this dissertation. Using the S-Function block of the MATLAB, the S function of the motor is written. The SIMULINK blocks of the inverter under different power device faults condition are built by the basic blocks of MATLAB/SIMULINK toolboxes, and the simulation system of the inverter drive system is completed. Finally, using the GUI to encapsulate the inverter drive system, the simulation platform for inverter drive system under fault condition is formed. The block of the inverter drive system under different faults condition can be called freely, and the figures of the phase current, torque, rotation speed are plotted simultaneous by controlling the button in the GUI platform. By studying these waveforms, the results show that the phase current, torque and rotation speed can be used as fault characteristics to achieve inverter fault detection and diagnosis rapidly.