Design Of Permanent Magnet Synchronous Motor Drive Control System For New Energy Vehicles

In the context of global warming,countries around the world are making more and more efforts to protect the atmospheric environment.As an important tool for energy saving and emission reduction,new energy vehicles are becoming more and more important in our daily life.With the continuous development of new energy vehicles,the requirements of motor drive system of new energy vehicles are getting higher.Compared with other motors,Permanent Magnet Synchronous Motor(PMSM)has a higher power density and good adaptability.PMSM has also become the most widely used servo motor for new energy vehicles.It is of engineering practical significance to study the drive and control system of PMSM to improve the safety,stability,practicability and comfort of the automobile.The main content of this paper is as follows:(1)Establish the vector control simulation model of PMSMBy researching the driving control principle of PMSM,and based on the characteristics of each part of the actual hardware system composition,the PI control current loop and speed loop double closed-loop controller is designed by using the motor parameters.The simulation model of the Field Orientation Control(FOC)system based on Space Vector Pulse Width Modulation(SVPWM)technology is established in the MATLAB/Simulink environment.(2)Formulate the stator current trajectory optimization control strategyAccording to the requirements of high endurance range,wide speed range,low speed and large torque,and high speed and constant power required by new energy vehicle motor drive,the optimal control strategy of stator current trajectory was formulated.The Maximum Torque Per Ampere(MTPA)was used to make full use of the motor reluctance torque to improve the energy utilization efficiency.the Jarratt-Newton iterative method was used to accelerate the iterative solving speed of the nonlinear equation of MTPA,and the iterative divergence was avoided.Gradient descent method is used to broaden the motor speed range by Flux Weakening Control(FWC).(3)Sliding mode speed loop controller was designedNew energy vehicles operating conditions are complex,the controller needs to have high dynamic response speed,good steady-state performance,strong robustness,good anti-disturbance and other requirements.Therefore,based on the second-order sliding mode super helix algorithm and global fast terminal sliding mode control,a global fast super helix sliding mode controller is designed to improve the performance of the existing controller.By improving the Super-Twisting Algorithm(STA),the convergence speed of the classical STA is accelerated and it can converge to the closer neighborhood of reference signal.(4)Semi-physical simulation test was carried out on the PMSM drive control system simulation test platformThe vector control model of PMSM built in MATLAB/Simulink toolbox is used to compare and simulate the above control strategies and control algorithms.Finally,the control algorithm was discretized,and the semi-physical simulation test was carried out using the existing permanent magnet synchronous motor experimental platform in the laboratory.The simulation test results show that,compared with the id=0 control,MTPA control strategy can improve the bus current utilization efficiency,and the FWC can broaden the motor speed range.The improved super-twisting sliding mode speed loop controller has better anti-disturbance performance and dynamic response process.Simulation and experimental results show the effectiveness and feasibility of the algorithm.