The enhancement of park current vectors technique for inverter fault detection

This paper work addresses the enhancement of this technique by associating it the polar coordinates as a proposed tool for a better detection and location of the faulty inverter switch. The proposed use of the polar coordinates tool not only allows the exact computation of both the magnitude and the phase angle values of the fault current vector allied to the faulty inverter IGBT but also enables to develop a simple graphical representation to facilitate the detection and location of the inverter fault by using a fault current vector representation instead of a trajectory representation as that in Park's vectors technique. To illustrate the merits and effectiveness of the enhanced detection Park's current technique, several simulation results are obtained and then validated by employing the experimental test-rig realized by the ‘diagnostic group’ in our LDEE laboratory.