Research On Control Strategy Of Asynchronous Motor Based On Synergetic Theory

Asynchronous motor has a very important position in the transmission system because of its simple structure,low cost and reliable operation.Therefore,its control strategy has been a hot topic for domestic and foreign scholars.With the development and improvement of modern control theory,the dynamic and static performance of the speed control system have been greatly improved.This paper has conducted an in-depth study of the control strategy combined with the synergetic theory and traditional vector control.In this paper,the dynamic mathematical model in three coordinate systems and the state space equation in the rotating coordinate system of the asynchronous motor are established according to the coordinate transformation theory.Secondly,the principle and characteristics of voltage space vector control and current hysteresis loop comparison control are analyzed,and the vector control system based on rotor field orientation is studiedThen,the concept of synergetic theory and manifold is introduced.Based on the state space equation of the motor,the mathematical solution of stator voltage and stator current references is deduced.The correctness and feasibility of different control algorithms are analyzed by simulating in MATLAB.Through mathematical method and simulation,it is verified that synergetic theory has good resistance to stator resistance and rotor resistance.Because the algorithm contains the instantaneous value of the load torque,the Longberg torque observer is introduced,and the principle and design of the observer are described in more detailFinally,on the basis of the theoretical analysis,the speed closed-loop experiment is carried out through the asynchronous motor experiment platfonn,and the feasibility of the synergetic control algorithm is verified.