Fault-tolerant matrix-converter-controlled IPMSM-drive system using a predictive controller and sliding-mode estimator

This study proposes a fault-tolerant matrix-converter-controlled IPMSM-drive system, in which a predictive speed-loop controller and a predictive current-loop controller are implemented to improve its dynamic responses, including transient responses and load disturbance responses of the IPMSM-drive system in both normal and faulty conditions. In addition, a sliding-mode estimator is used to estimate the rotor position, rotor speed, and stator currents of the IPMSM when the encoder or current sensor in the IPMSM-drive system is faulty. As a result, the IPMSM-drive system allows for either an encoder fault or a Hall-effect sensor fault. The detailed fault detection, diagnosis, and control are discussed here. In case of an encoder fault or a Hall-effect current sensor fault, the IPMSM-drive system still functions. A digital signal processor, TMS 320LF2407A, is used as a control centre to execute the fault-tolerant algorithm, state-estimating algorithm, and control algorithm. Experimental results can validate the correctness and feasibility of the proposed fault-tolerant and predictive control methods.