Fuzzy Vector Control Of Permanent Magnet Synchronous Motor Based On Active Disturbance Rejection Control

The permanent magnet synchronous motor(PMSM)has the advantages of high power density,dependable operation,simple structure and convenient maintenance,and is used in the field of AC drive control.With the apace development of modern control technology,PMSM control system with optimized control strategy has received wide attention.How to effectively control the dynamic and static state of PMSM speed control system and enhance the anti-interference performance of the system has become a hotspot.This thesis mainly studies PMSM and its space vector pulse width modulation(SVPWM)technology.Firstly,the structure,characteristics,control strategy and algorithm of PMSM are recommend,and the mathematical model of PMSM in different coordinate systems is set up.After that,analyzing the SVPWM technology and selecting the current vector control method of id=0.The model of the feedback speed regulation system of the PMSM outer ring and current inner loop is set up.The results indicate that the traditional PI control method has problems such as slow response,large overshoot and poor anti-interference due to its limitations,and it is hard to obtain the ideal control effect.In view of the control strategy of the traditional PMSM control system,The thesis made two improvements.Firstly,for the sake of improve the anti-interference of the system,the active disturbance rejection control technology is recommend to improve the current loop,that is,the auto-disturbance-proof controller is used to replace the PI controller in the current loop;The nonlinear function in the typical auto disturbance rejection controller is improved to make it smoother and more satiny.At the same time,an auto disturbance rejection controller with model compensation is designed to replace the PI regulator in the current loop.Secondly,in order to improve the dynamic performance of the system,fuzzy control theory is introduced to improve the speed loop,that is,the PI control technology and the fuzzy principle are combined to form a fuzzy PI controller with self-adjusting parameters instead of the PI controller in the speed loop.In the real-time control,the two parameters of the PI controller are automatically adjusted online,so that the fuzzy PI controller runs in the most ideal working environment.Finally,the two control methods are effectively combined to establish a model of PMSM fuzzy vector control system in view of auto disturbance rejection technology.The results indicate that compared with the traditional PI control algorithm,the improved system has an excellent dynamic and static performance quality,and has strong robustness and anti-jamming.