Fault Tolerant Control For Five Phase Permanent Magnet Synchronous Machine With Stator Winding Resistance Unbalance

Recently,permanent magnet synchronous motor(PMSM)has been widely used in electric vehicles,aerospace,wind power generation and subway high-speed railway.With the development of power electronics,microelectronics technology and motor control theory,the motor drive system gets rid of the shackles of only three-phase power supply system.Because of its strong fault tolerance,low voltage and high power drive,the multi-phase motor has low power density.More and more attention has been paid to the advantages of high torque density and high reliability.In the motor control system,its main consist of a motor,drive circuit,sampling circuit,inverter and so on,and in the process of the motor running,a fault is likely to occur in the certain part,which will lead to the abnormal operation of the motor and seriously damage the entire motor.Therefore,it becomes particularly important to diagnose the fault of the motor at a certain moment and ensure the stable operation of the motor system in the fault through fault-tolerant control.In this paper,the five-phase PMSM is studied in depth under the condition of the resistance imbalance of stator windings.The main contents are as follows:1.Based on the traditional PMSM,the basic structure and working principle of the motor are introduced in this paper.2.Aiming at this subject,the research background of five-phase PMSM drive control system and the research status at home and abroad are described.3.The transformation relation of five-phase PMSM in natural coordinate system and rotating coordinate system is analyzed,and the mathematical model of five-phase PMSM in natural coordinate system and rotating coordinate system is established.4.The control strategy of five-phase PMSM drive system is analyzed in detail,and the control block diagram is constructed.The simulation model under current hysteresis control and SVPWM vector control is built,and the simulation results are given.5.On the basis of hysteresis control,the asymmetrical fault of five-phase PMSM in single-phase stator windings is calculated based on the principle of invariance of magnetic potential before and after motor failure.The minimum power loss under two-phase stator winding asymmetrical fault and double concurrency fault(phase absence fault and single-phase stator winding asymmetry fault)is obtained.On this basis,the relationship between the amplitude and phase of five-phase stator current is obtained,and the simulation results are given.6.In the research of fault-tolerant control of five-phase PMSM stator winding asymmetrical fault,the influence of third harmonic on power loss is considered,and the simulation results are given.7.Based on CCS software,the hysteresis control program is programmed and debugged,the motor control platform is built,and the experimental verification is completed.The research of this dissertation was supported by National Natural Science Foundation of China(51607001,51637001)ant the Natural Science Foundation of Anhui Province(1708085QE108,1508085ME87).