Research On The Active Disturbance Rejection Control Strategy Of Pmsm With Inertia Identification

Permanent magnet synchronous motor(PMSM)is widely used in the field of high performance control in recent years due to its advantages such as high starting torque,high power density and strong overload capacity.But because it is a nonlinear and strongly coupled time-varying system,under the internal and external disturbances with strict working conditions and variable model parameters,it is necessary for the control technology to have high anti-disturbance performance to ensure that the control system has excellent dynamic and static characteristics.Based on this,the paper focuses on the study of ADRC control strategy,and designs a high-performance control algorithm for PMSM by combining the rotary inertia identification method.The robustness of the control system is improved.Firstly,PMSM mathematical models are established by using coordinate transformation,and the initial order reduction and decoupling of the controlled system are realized.The vector control strategy is discussed and the vector control scheme with is adopted to realize the complete decoupling of the controlled object.The realization process of SVPWM modulation technology and the ADRC theory are expounded.By comparing the advantages and disadvantages of linear ADRC and nonlinear ADRC,the research scheme of the paper is determined.Secondly,according to the state equation and velocity output equation of PMSM and combined with the linear ADRC strategy,a second-order ADRC is designed for PMSM system.The realization process of each part of the controller and the setting direction of adjustable parameters are described in detail.The stability of the controller is analyzed theoretically.The simulation is comp ared with the traditional PI controller to verify the control effect of the control algorithm.Finally,considering the complex operating conditions,changing the moment of inertia will worsen the dynamic characteristics of the system,in this paper,the influence of the change of moment of inertia on the performance of the control system is discussed through frequency domain analysis and simulation.Recursive least square method of forgetting factor and Landau discrete recursive method are designed respectively.Through simulation comparison and analysis of their advantages and disadvantages,the Landau discrete recursive algorithm with stronger anti-disturbance performance and higher robustness is selected to obtain the exact value of the moment of inertia.The identification results are used to realize the self-tuning of the parameters of the ADRC to optimize the overall dynamic characteristics of the controlled system and expand the adaptive range of the ADRC.