Research On Cascaded And Integrated Control Method Of Permanent Magnet Synchronous Motor Vector Control System

Permanent magnet synchronous motor(PMSM)has the characteristics of simple structure,high efficiency and high power factor,which makes it widely used in the industrial field.The speed loop and current loop of PMSM traditional vector control system usually adopt PI controller,which is simple in principle and easy to operate.However,due to its weak robustness,it is easy to be affected by parameter changes and load disturbances,which reduces the speed regulation quality and is difficult to meet the requirements of high-performance speed regulation.Therefore,it is imperative to study the advanced control strategy of PMSM speed control system.Under the basic framework of the vector control system,starting from the cascade type and the integrated type,this paper studies the high-performance control strategy to improve the speed regulation quality of the PMSM system,and conducts the following researches:Two double-loop speed control schemes for cascaded permanent magnet synchronous motors with disturbance compensation are proposed,which effectively solve the problem of system robustness deterioration caused by comprehensive disturbances in the speed control system.The sliding mode control is designed in the speed loop,and the RBF neural network is used to approximate the unknown disturbance in the sliding mode control to suppress the chattering phenomenon.The deadbeat predictive current control is adopted in the current loop to improve the dynamic performance of the motor current.A PMSM deadbeat predictive current control speed regulation system based on RBF sliding mode speed cascade is formed.The second-order sliding mode controller is designed,and two extended state observers are used to observe the comprehensive disturbance.The second-order sliding mode speed controller and deadbeat predictive current controller are compensated respectively to enhance the robustness and improve the fast tracking performance of speed and current,and build a PMSM deadbeat predictive current control speed regulation system based on the second-order sliding mode speed cascade based on ESO.Finally,the feasibility and superiority of the proposed control strategy are verified by simulation.The SMC-SADRC permanent magnet synchronous motor controller is designed,and an integrated strategy for the model predictive current control system of the permanent magnet synchronous motor based on SMC-SADRC is proposed.Through the organic combination of tracking differentiator,sliding mode controller and linear/non-linear switching expansion observer,the desired voltage of q-axis is obtained,and the obtained integrated controller replaces the cascade structure of velocity and q-axis current controller.The d-axis current output voltage is controlled by the deadbeat prediction current.The system is not only simple in structure,but also has good noise immunity and rapidity.Finally,the effectiveness of the proposed control strategy is verified by simulation.A hardware-in-the-loop experiment platform for PMSM motor vector control speed regulation system is built,and the NI controller is used to control the inverter to adjust the speed of the motor.The hardware-in-the-loop simulation verification of the permanent magnet synchronous motor speed control system is carried out on this platform,which proves the effectiveness of the proposed scheme.There are 43 figures,10 tables and 81 references in this paper.