Research On High Performance Predictive Control Of Permanent Magnet Synchronous Motor For Vehicle

Permanent magnet synchronous motor(PMSM)has the advantages of small size,light weight,simple structure,high efficiency and flexible control.It has been widely used in the drive system of electric vehicle.Its performance directly affects the overall performance of the vehicle.However,the PMSM drive system has the characteristics of multi variable,strong coupling,complex nonlinearity and high uncertainty of load.High performance control has always been the research focus and difficulty,which is very challenging.In order to meet the control requirements such as fast response and strong robustness,a series of high-performance control strategies for PMSM are designed based on deadbeat control,model predictive control,sliding mode variable structure and other methods and technologies.The main work of this paper is as follows:First of all,based on the discussion and analysis of the current situation and development trend of electric drive system control strategy of electric vehicle,a dual loop control structure of PMSM system is proposed to enhance the system robustness.The control structure consists of an improved deadbeat controller and Terminal sliding mode variable structure disturbance observer,which can solve the delay problem and the error tracking problem in the control of the drive system.Then,a single loop controller based on model predictive control is proposed to solve the complex structure and many parameters of traditional speed current cascade control.According to the model predictive control theory,the predictive model of PMSM is derived,and the optimal control vector is selected by using the evaluation function optimization.It can reduce the nonlinear effect of some variables on the system in the double closed-loop structure.In order to enhance the robustness of the control system,a nonlinear disturbance observer is introduced to estimate the external load disturbance and reduce the uncertainty of the parameters.The single loop controller designed in this paper has few control parameters and is easy to realize in industrial application.Finally,in order to verify the effectiveness of the proposed method,a software and hardware platform based on Links-RT real-time simulation system is built,and the control system proposed in this paper is tested to verify its feasibility and effectiveness.It provides a solution for high performance control of PMSM.