Fault detection and fault-tolerant control of power converter fed PMSM

Abstract

In this paper, an investigation of inverter fault-tolerant field-oriented control for permanent magnet synchronous motor (PMSM) with loss of one transistor or loss of one phase is presented. The basic idea of this design consists in incorporating a fourth legs inverter, with the same topology of the three legs. In this case of fault-tolerant inverter, a redundant leg is added that replaces the faulted leg. The proposed inverter provides tolerance to open circuit fault of the switching devices. The detection of faulty legs is based only on the output inverter currents measurement. Experimental results show that the method is able to detect and isolate the open switch or the open phase faults in PMSM. In our case, the fault detection and isolation block is based on the current signals measured and the maximum threshold they exceed that in case of fault. The experimental implementation is carried out on powerful dSpace DS1103 controller board based on the digital signal processor.