Research On Active Disturbance Rejection Control Strategy Of Permanent Magnet Synchronous Motor Based On Position Sensorless Technology

With the rapid development and continuous progress of power electronics technology,high-power AC drive system has become a hot spot in today’s industrial production.Due to the limitation of the traditional three-phase motor in industrial production,it can not meet the actual requirements.However,multi-phase motors have the advantages of strong reliability and high output power that traditional three-phase motors cannot possess,and can meet their needs in the industrial production and automation industries of high-power AC drives.In this study,the dual Y shift 30° six-phase PMSM with an isolated neutral point was investigated.Firstly,the different winding structures of symmetrical double Y-shifted 30 degree six-phase permanent magnet synchronous motor and asymmetrical double Y-shifted 60 degree six-phase permanent magnet synchronous motor are compared and analyzed,and the motor mathematical model of double Y-shifted 30 degree motor in natural static coordinate system is established.Then,according to the different modeling methods,the mathematical model of six-phase motor in natural coordinate system is modeled by two different transformations: dual d-q transformation and vector space voltage decoupling transformation.Two mathematical models of six-phase motor in two-phase rotating coordinate system are obtained.Then,the application of maximum four-vector modulation technology in six-phase motor controller is analyzed in detail by using field-oriented vector control with id=0 in the mathematical model of vector space voltage decoupling modeling.Secondly,the application of sensorless control in six-phase motor is analyzed.Based on the mathematical model of six-phase motor in static coordinates,a sliding mode observer is established.For the problem of amplitude attenuation and phase delay caused by first-order low-pass filter in traditional sliding mode observer,which obtains the estimated value of motor back-EMF from high frequency signal,the sliding mode switch function of traditional sliding mode is applied.The improved sliding mode observer method can improve the estimation accuracy of the back-EMF and maintain the accuracy under the variable frequency condition by replacing the variable frequency stator current tracking function.In order to improve the dynamic performance of the control system and suppress the load disturbance and the speed overshoot during start-up,the active disturbance rejection controller is applied to the speed loop controller to realize the disturbance suppression of the system.However,the standard active disturbance rejection controller has nonlinear functions,which leads to the difficulty in tuning the control parameters.In order to simplify the structure of the controller,the sliding mode variable structure control theory is added to the ADRC to simplify the control algorithm.Finally,based on six-phase permanent magnet synchronous motor,the simulation model of sliding mode observer algorithm and active disturbance rejection control algorithm proposed in this dissertation is built by MATLAB/Simulink,and the application performance of its control strategy in six-phase permanent magnet synchronous motor is simulated,which verifies the feasibility of the control strategy.Then the hardware circuit and control algorithm are designed,and the hardware circuit platform is built.The control strategy is further verified from the experimental aspects.