Wavelet-fuzzy-based algorithm for condition monitoring of voltage source inverter

A real-time condition monitoring algorithm for a three-phase pulse width modulation inverter in a fuzzy controlled induction machine is developed. It is designed to detect and identify the transistor open-circuit fault and intermittent misfiring fault, which commonly occurs in the drive system. The condition monitoring mechanism is based on discrete wavelet transform and fuzzy logic. The developed system has been rigorously assessed theoretically and experimentally, and it has been shown that the system is robust and reliable.