The Application Research On The Asynchronous Motor Frequency Control Speed Regulation System Based On The Fuzzy Control

With the development of power electronics technology and modern frequency control,and the proposal of the AC motor vector control theory, the inverter technology has beengreatly developed. Moreover, in recent years, intelligent control got great development interms of motor speed control, and fuzzy control theory, as a branch of intelligent control, wasapplied to the theory of induction motor vector control, which can further improve the staticand dynamic performance.Based on the three-phase induction motor mathematical model and the basic principlesof vector control, this thesis analyzes induction motor vector control system, improves thetraditional ASR speed regulator PID control, adopts adaptive fuzzy PID control, and sets upthe simulation model of the speed with torque inner loop and closed-loop vector controlsystem, compares the traditional PID control with adaptive fuzzy PID control. The maincontent of this study can be divided into three parts.Firstly, the study gives an overview of the development of AC variable speed andinverter technology and intelligent control theory in the electric transmission system, analyzesthe asynchronous motor vector control method. This paper employs the rotor flux observerin two-phase rotating coordinate system to determine the position of rotor flux, and thehysteresis current pulse generator to generate the trigger pulse, and establishes the vectorcontrol.Secondly, the PID control and adaptive fuzzy PID control principle is introduced to makethe simulation for the step signal. And it verifies the advantage of fast response of theadaptive fuzzy PID control.Thirdly, by Matlab/Simulink, this paper sets up the simulation model of the speed with torque inner loop and closed-loop flux vector control system. It also applies the traditionalPID control and adaptive fuzzy PID control to the ASR speed controller, proves that theadaptive fuzzy PID control has the advantages of fast response, low overshoot.Finally, the study makes the summary to this article, and gives the analysis and prospectfor the future research.