Research On Pmsm Control System Based On Fractional PI~λD~μ

The permanent magnet synchronous motor control system is a dynamic change system whose output can accurately track the input value and can change according to the input change,and is widely used in industrial production.Due to the small size,high power factor and high torque density of the permanent magnet synchronous motor,combined with the advantages of simple maintenance and reliable operation,it becomes the most important type of motor control in practical applications.The integer PID control method is simple in structure and easy to implement.However,since the actual motor will encounter external disturbances and many unstable factors during operation,these may directly lead to deterioration of the control performance of the classic PID.Therefore,this paper designs an offline and online control based on the improved hybrid algorithm for PMSM speed.The purpose of this paper is to explore the method of enhancing the control performance of PMSM control system,and the application of control system combining fractional order PI~λD~μcontroller and motor.Firstly,this paper explores the basic structure and principle of permanent magnet synchronous motor,the mathematical modeling process of each module,and the application of traditional PID controller and fractional order PI~λD~μcontroller in AC motor control system.The vector control method of the permanent magnet synchronous motor control system are discussed in depth.The design schemes of integer and fractional control of current controller and speed loop controller are given.Then the simulation model of AC motor control system based on fractional order PI~λD~μcontroller is established.In the synchronous motor system,the traditional PID controller and the fractional-order PI~λD~μcontroller are used for the speed control simulation experiment.The experimental analysis shows that the fractional-order PI~λD~μcontroller greatly enhances the ability of the control system to resist external interference.Secondly,PMSM’s fractional-order PI~λD~μcontroller has many parameters and is difficult to set.Therefore,an algorithm combining artificial firefly and improved harmony algorithm is proposed to optimize parameters.The standard artificial firefly algorithm,harmony algorithm and two hybrid algorithms are used to optimize the parameters of the same control object,and the advantages and disadvantages of the algorithm are evaluated by the ITAE index function.The uniqueness of the hybrid algorithm is verified.It isapplied to the parameter optimization of fractional-order PI~λD~μcontroller of permanent magnet synchronous motor control system,and the effects of three algorithms on motor performance are compared.The simulation results show that the improved hybrid algorithm can quickly retrieve the optimal parameter values of the controller and improve the robustness and anti-interference of the system.Finally,based on the theoretical knowledge of predictive function,a virtual error-based PMSM fractional-order PI~λD~μcontroller with online control parameters is designed.The reference trajectory of the motor speed control system and the mathematical model of the predicted object are also given.Then the designed fractional-order PI~λD~μcontroller is applied to the velocity loop of the PMSM control system.The simulation model is built in simulink and the simulation experiment is carried out.The simulation results show that the proposed fractional-order PI~λD~μcontroller based on virtual error can be very Good real-time online control system speed control improves the performance of the AC control system.