Fault Diagnosis and Fault-Tolerant Control Applied to a PMSM Drive Under Open Switch Fault

Voltage source inverters VSIs are extensively used in several industrial applications, including the area of variable speed induction motor IM or permanent magnet synchronous motor PMSM drives. However, they can suffer some critical faults such as open-circuit faults OCFs in IGBT power switches. This paper aims to study a fault diagnosis FD and fault-tolerant system against IGBT OCFs in voltage-source inverter-fed PMSM. The fault tolerance strategies that will be discussed here are, the first one is to connect the faulted phase of the power converter to the DC-link capacitors midpoint by firing TRIACS; the second strategy consists of the connection of the faulty inverter phase to an extra-leg through TRIACS. The effectiveness of the studied FD method and fault-tolerant strategies is verified through computer simulation using MATLAB-SIMULINK software.