Active Disturbance Rejection Control Of PMSM Based On Feedforward Compensation And Motor Parameter Identification

With the continuous development of society and the vigorous rise of permanent magnet material technology,permanent magnet synchronous motor(PMSM)has been widely used in industrial control and social life.With the increasing share of electric vehicles in the market,the demand for permanent magnet synchronous motor(PMSM)is increasing,and the research upsurge of PMSM will come.Among the various strategies of PMSM,vector control has become a popular motor control strategy because of its fast response,convenient control and strong anti-interference ability.Vector control has many advantages,but also with the difficulty of parameter adjustment and external interference.At the same time,when the motor parameters change,it is unable to make accurate compensation according to the existing model.Parameter identification is used to accurately adjust the motor parameters.While solving the problem of motor parameters,the anti-interference ability has not been greatly improved.Aiming at the problems of vector control,this thesis will make a series of improvement measures.Firstly,taking the vector control of permanent magnet synchronous motor as the research direction,the structure and working principle of permanent magnet synchronous motor are introduced.Based on the strong coupling of motor,the motor models in different coordinate systems are established,and the actual defects in the control process are found by building the traditional vector control system simulation model.Then,in order to solve the problem that the vector control especially depends on the motor parameters and has poor anti disturbance ability,the traditional PI is replaced by the active disturbance rejection controller in the speed loop.In order to deal with the phenomenon that the stator resistance of permanent magnet synchronous motor is heated at high speed,the stator flux identification is designed based on the concept of parameter identification.Finally,in order to strengthen the anti disturbance ability of the control system and make the motor control system meet the design requirements of practical application,the load torque feedforward compensation is introduced to improve the motor control system.To sum up,the lunberg observer and speed loop active disturbance rejection controller designed in this thesis can achieve good control effect in reducing the influence of motor parameters,improving the response speed of the control system and enhancing the anti-interference ability of the system.This method is suitable for surface mounted permanent magnet synchronous motor and built-in permanent magnet synchronous motor.In order to prove the rationality and effectiveness of the design content,the system is verified in MATLAB and RT-LAB hardware in the loop simulation platform.The verification results show that the design has research and application value.