| Compared with the traditional permanent magnet synchronous motor,the highspeed permanent magnet synchronous motor has superior performance.Because of its smaller volume,larger power factor and better control performance,it is more and more widely used in aviation and radar storage capacity,compressors and other industrial engineering fields.It allows direct driving of high-speed loads,thus avoiding the noise and loss caused by the use of traditional mechanical drive in recent years.In the field of international electrical engineering,more and more scholars are eager to study the control system of high-speed permanent magnet synchronous motor.However,when the high-speed permanent magnet synchronous motor runs at high speed,there will be a series of problems,such as the reduction of carrier ratio and the delay of digital control system,which will seriously affect the performance of the control system of high-speed permanent magnet synchronous motor.In addition,there are still some shortcomings in practical application.Therefore,it is very important to study the control system of highspeed permanent magnet synchronous motor based on these problems.In this paper,taking the surface-mounted permanent magnet synchronous motor as the research object.Firstly,the mathematical models of PMSM in different coordinate systems are established,and the vector control system is studied based on the principle of space vector modulation.When the carrier ratio decreases due to the increasing speed of PMSM,a low carrier ratio current controller is designed to solve the serious coupling problem in vector control system,and the angle delay compensation is carried out to solve the delay problem of digital control system.Then a complex vector current control system with angle compensation can be established.Aiming at the problem that the vector control system of high-speed permanent magnet synchronous motor depends heavily on parameter setting and has slow dynamic response,the current predictive control strategy is adopted.Then,the performance of current predictive control algorithm is analyzed.Aiming at the problem that the control system is unstable and the control performance is degraded due to external factors such as motor model parameters,a stator current disturbance observer is designed using sliding mode variable structure,and the current predictive control system with stator current disturbance observer is studied.Finally,based on d SPACE real-time simulation system,an experimental platform of permanent magnet synchronous motor control system was built,and vector control experiment of high-speed permanent magnet synchronous motor and complex vector current control experiment of angle compensation were carried out.The experimental results show that the high-speed permanent magnet synchronous motor control system algorithm adopted in this paper can improve the system control performance of the motor at high speed. |
