Five-phase Permanent Magnet Motor Multi-vector Model Predictive Control And Its Fault-tolerant Application

Five-phase permanent magnet(PM)motor not only has the advantages of high efficiency and high power density,but also has the ability of high reliability and fault-tolerant operation ability.It has good potential in real applications.In order to improve the competitiveness of five-phase motor in real applications.This paper proposes multi-vector finite control set model predictive control(FCS-MPC)strategy,which is based on the control principle of five-phase motor and basic principle of FCS-MPC.Alao,this strategy can be extended to the field of fault-tolerant control.In the control structure,the proposed multi-vector FCS-MPC strategy preserves the advantages of conventional FCS-MPCC,which include without tuning process,multi variable control and fast dynamic response.In terms of operational performance,the operational performance can be significantly improved both in the normal and fault-tolerant operation.Also,the proposed multi-vector FCS-MPC can be applided to the other motor with different phase.The research contents of this paper include multi-vector control set,multi-vector duty cycle modulation technology,computational efficiency optimization technology and high-quality fault-tolerant control.The main research results as following:1.The method to improve the operational performance of FCS-MPC for five-phase motor is studied.The limitation of conventional FCS-MPC strategy for five-phase motor is analyzed.A general method of multi-vector FCS-MPC for five-phase motor is proposed.2.An optimal vector selection method with reduced computational burden is proposed.According to the optimal vector selection mechanism of FCS-MPC,the effective way to reduce the computational burden is analyzed.A step-by-step prediction method for optimal vector selection is proposed.3.The methods to improve the operational performance of FCS-MPC are analyzed.By using the control constraints of suppressing the harmonic space components.The basic control set is extended.Combined with duty cycle modulation techmology,the modulation range can be extended from point to line.4.The duty cycle modulation technology with continued modulation is proposed.Combined with the optimal vector selection mechanism of FCS-MPC and the modulation technology of space vector modulation(SVPWM)of five phase motor,the cascade optimization with continued modulation is designed.By using this method,the modulation range can be further extended from line to surface.5.The utilization principle of the control freedom of the faulty motor is studied.The influence of control freedom loss for motor control is analyzed.Then,the mathematical model of the faulty five-phase PM motor can be constructed.By using the residual control freedom,a fault-tolerant FCS-MPCC stratege with minimized copper loss is proposed.6.The method of improving vector selection accuracy of fault-tolerant FCS-MPC is studied.Based on the post-fault vector distribution and disturbance from the faulty motor,the detailed method to improve the accuracy of optimal vector selection are analyzed.The high-quality model predictive fault-tolerant control is proposed7.The software and hardware experimental platform of five-phase PM motor is built to verify the proposed multi-vector model predictive controls.This experimental platform provides the experimental basis for the development of high-performance five-phase motor drive system.