Research On Model Predictive Torque Control Of Permanent Magnet Synchronous Motor

Permanent magnet synchronous motor is a high-performance and high-reliability AC motor.It has the advantages of low manufacturing cost,low coupling,low non-linearity,high reliability,small overall size and high-power factor.It is widely used in the field of industrial manufacturing.Therefore,motor control technology has been a research hotspot in recent years.Traditional vector control has disadvantages such as large system calculation and slow dynamic response,while direct torque control has problems such as large harmonic loss,large flux pulsation,and poor low-speed performance.Therefore,this article has carried out in-depth research on the model predictive control technology of permanent magnet synchronous motor,and the work done is as follows:First,on the basis of constructing the electrical and mechanical state equations of the permanent magnet synchronous motor,discrete processing is carried out to obtain the difference equation of the permanent magnet synchronous motor,and the permanent magnet synchronous motor incremental prediction model,torque prediction model and minimum current are respectively derived the calculation method of the flux linkage is given.Then,considering the delay compensation,the traditional single vector model predictive control method,the cascade model predictive control method and the multi-objective sequence predictive control method with the cost function of torque and flux linkage are respectively studied.The principle of selecting candidate vectors for dual vector predictive control of permanent magnet synchronous motors is given,and the method of torque deadbeat model predictive control is described.On this basis,the model predictive control of torque and flux linkage deadbeat control method is introduced.Finally,the influence of the weight coefficient on the torque predictive control effect is analyzed,and on the basis of in-depth research on the dual-vector weightless permanent magnet synchronous motor model predictive control method,a dual-vector model predictive control without weighting factor that can effectively reduce the amount of calculation is proposed.A variety of predictive control simulation models of permanent magnet synchronous motor models were built in the Simulink simulation environment of Matlab.Respectively the steady-state current harmonic distortion rate and the dynamic effect of the traditional single vector MPTC,cascaded MPTC,MPTC based on the sequencing method,model predictive flux control,MPTC based on torque deadbeat control,MPTC based on torque and flux deadbeat control,and three methods of MPTC without weighting factor proposed in this paper are compared.And on the permanent magnet synchronous motor drive platform based on the real-time digital control system of TMS320C28346,the steady-state and dynamic control performance of the double vector of MPTC without weighting factor proposed in this paper is verified.The simulation and experimental results show that weightless dual vector predictive control with reduced computation can still have lower current harmonic distortion and fast dynamic response on the basis of reduced calculations.