Improved model predictive torque control of permanent magnet fault tolerant vernier rim-drive motor
In order to improve the control performance of fault tolerant permanent magnet vernier rim driven moter(FTPMV-RDM)under normal state and one phase open circuit fault state,an improved model predictive torque control(MPTC)method based on the voltage vector preselection is proposed.In view of the large number of alternative voltage vectors provided by six phase independent H-bridge inverter,which leads to the large amount of calculation of MPTC system,the preselected voltage vector is determined by using torque,flux error and stator flux position information in direct torque control to reduce the enumeration times of voltage vector in MPTC system,and then the optimal voltage vector is obtained by secondary screening using value function.In order to realize fault-tolerant control under open circuit fault,an open circuit fault-tolerant control strategy of replacing alternative voltage vector meter is proposed.The experimental results show that the FTPMV-RDM model predictive torque control algorithm based on the voltage vector preselection can suppress current distortion without fault and one-phase open circuit fault,and then effectively reduce torque and flux ripple.
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