Research On Model Predictive Control System Based On Virtual Open-winding Permanent Magnet Synchronous Motor

The open-winding permanent magnet synchronous motor has the advantages of being able to run in high-power applications,high voltage utilization,and good faulttolerant control.It has become a research focus.However,the open-winding permanent magnet synchronous motor has a complex structure.In the motor functional test,it has high cost and energy consumption.many.Considering that when an independent power supply is used,there is zero-sequence current in the open-winding permanent magnet synchronous motor,which affects the performance of the system.Therefore,it is the significance of this research to replace the physical motor to complete the power level test and effectively suppress the generation of zero-sequence current.Based on the establishment of the open-winding permanent magnet synchronous motor mathematical model,the problems of zero-sequence characteristics in the dual inverter structure powered by independent power sources are analyzed,and the voltage vector distribution diagram of the dual inverter structure is established;for the openwinding permanent magnet synchronous motor.The mathematical model is virtualized,the digital operating state of the motor is solved,and a virtual motor real-time simulator is established.Based on this,a voltage vector reconstruction model predictive control strategy based on zero-sequence current suppression is proposed and a dual grid-connected energy-feeding converter is designed.Closed loop control strategy.Constructed a virtual open-winding permanent magnet synchronous motor control system.Conducted preliminary verification of the virtual motor real-time motor simulator,and simulate the motor vector control,model predictive control and model predictive control strategy based on zero-sequence current suppression on the basis of the open loop system.Completed the comparative analysis of the performance for different control strategies under different working conditions.The simulation results show that the control strategy proposed in this paper is applied to the motor control system to reduce the redundant state of the switch,the zero-sequence current can be suppressed to less than 0.05 A,and the three-phase current THD of the motor it is 2.31%,which effectively suppresses the generation of zero-sequence current,improves the power quality of the system,and verifies that the system has good dynamic performance.Designed a virtual open-winding permanent magnet synchronous motor overall control system and complete the experimental platform construction.Seted up a functional comparison experiment between the virtual motor and the actual motor,the experimental results show that the virtual motor replacement is really fast in the process of completing the power test of the actual motor,and the overshoot is completed.The time is only about 1/3 of the actual motor,the system runs smoothly and the position angle can match the actual motor;the control strategy proposed in this paper has an obvious effect on the zero-sequence current suppression,which is only of the zero-sequence current under other control strategies around 1/2-1/10.The research in this paper has positive significance for the performance testing and zerosequence current suppression of open-winding permanent magnet synchronous motors.