Research On Vector Control Optimization Of PMSM Based On Active Disturbance Rejection Algorithm

Electric vehicles are usually driven by permanent magnet synchronous motor（PMSM）,which has less impact on the environment than internal combustion engine,and is the future development direction of automobile industry.Vector control technology is widely used in PMSM drive control of electric vehicles with its advantages of good torque load capacity,large torque output and wide speed range.Due to the strong coupling of PMSM,the complex nonlinear characteristics of multi variables and the complex changes of road conditions such as dust,sand,mud and water in the process of vehicle driving,there are multiple unknown disturbances in the process of vehicle driving,which significantly affect the dynamic quality of vector control process.In order to ensure the safety and stability of the electric vehicle driving state,it is necessary to improve the anti disturbance performance and parameter identification ability of the vector control process of the electric drive system,so it is of great significance to study the anti disturbance optimization of the PMSM vector control driving technology of the electric vehicle.Aiming at the PMSM vector control drive system of electric vehicle,this paper studies the accurate detection scheme of d-q axis inductance of hub motor,and uses ADRC technology to implant PMSM vector control method of electric vehicle to improve the anti-interference ability of vehicle ramp electronic parking and steering process,improve the response speed and stability performance of the system,and achieve the optimization effect of or control.Firstly,the permanent magnet synchronous electric drive model is established,and the influence of high-efficiency vector control algorithm optimization on the electric drive system for the purpose of improving the anti-interference ability and response speed of the system is pointed out;the vector control principle is described,the d-q axis inductance off-line AC static method is studied,and the disturbance analysis of the steering process and the ramp electronic parking process of the electric vehicle is carried out;traditional vector control algorithms were analyzed for anti-jamming capability,and Auto disturbance rejection control（ADRC）was selected as the main algorithm in this paper.Secondly,in view of the complex problem of measuring d-q axis inductance of the external rotor of the in-wheel motor,a two-phase line in-phase AC static method（ACSM）detection scheme is proposed.According to the stator voltage and current equations of d-q axis,the expressions of equivalent inductance L_deq（θ_r）and L_qeq（θ_r）of d-q axis are derived.it is verified that the d-q axis inductance in ACSM measurement method based on two-phase line in phase is not based on the need of locked rotor tooling and no rotating electromagnetic torque,adjusting the rotor angleθ_rcan realize the more accurate measurement of inductance,make the data more stable,the device is more simplified and closer to the actual situation.Thirdly,aiming at the complex and changeable driving environment and uncertain external interference,ADRC is implanted into the PMSM vector control system of six-wheel vehicle,the vehicle steering characteristic equation is established and its Laplace transform is used to analyze the impact of vehicle speed change on the steering transient response according to the eigenvalue,and the vehicle is analyzed based on the transfer function of steering input response yaw rate and centroid sideslip angle turn to the collaborative control process.A six wheel vehicle steering auto disturbance rejection control model is established.Simulation and comparative study of six wheel vehicle steering process parameters changes under Fuzzy PID and ADRC,it is verified that the steering process of ADRC six wheel vehicle has good response speed and stability performance.Finally,the nonlinear dynamics and disturbance analysis of the braking process and static state of the vehicle ramp electronic parking are carried out,and the auto disturbance rejection control technology is integrated into the motor vector control strategy.An effective method of using ADRC technology to drive the motor to realize the parking brake is proposed.The design and parameter setting of the second-order position loop nonlinear ADRC and the first-order current loop linear ADRC are completed.Simulink is applied The simulation and the real car test of TMS32028069main control chip of TI company verify that the performance of ADRC ramp electronic parking is better than PID technology,and the parking brake efficiency is higher.