Analysis of Open-Switch Fault Two Level Three Phase Voltage Inverter Behaviour and Automatic Detection and Location Using Zero Harmonic Component

The faulty performance of two level three phase voltage inverter is studied under open-switch conditions. This inverter is three phase two level six IGBT voltage source inverter feeding a three phase balanced resistive-inductive load. The inverter three phases currents zero harmonic components are used as diagnostic indices. A knowledge algorithm is based to get information on which IGBT is in open-switch fault condition. This algorithm testing shows that the system could not only detect the open-switch fault, but also identify the faulty switch. Presented simulation results confirm the effectiveness of the proposed methodology.