Fault-tolerant Model Predictive Current Control of Six-Phase Permanent Magnet Synchronous Motors with Pulse Width Modulation

A model predictive current control strategy with pulse width modulation is proposed for a single-phase open circuit fault. This method decomposes the change matrix based on the normal vector space to ensure that the decoupling matrix remains unchanged so that there is no need to reconfigure the controller topology. By analysing the fault phase voltage difference under normal and fault conditions, 24 synthetic virtual voltage vectors are used to compensate the voltage vector during a single-phase fault and eliminate the current coupling problem. In addition, a standard pulse width modulation switching sequence is implemented to achieve the purpose of unifying the switching frequency, which makes the method easy to implement. Finally, the effectiveness of the proposed method is verified by experiments.