Research On Control Method Of Asynchronous Motor Based On System Energy-shaping And Speed Sensorless Control

AC induction motors is necessary in our daily life and industrial production. The extensive application of the motor drive us to study and analyze the structure and control of that kind of motor. In this study, many characteristic, like non-linear and multi-variable,make it hard to control so that AC drive technology has been the focus of this field of study.Recently, many non-linear control methods come into this field. Because of its different control method, the Energy-Shaping(ES) control has draw great attention and lots of accomplishment has been established in relational study and application.Speed feedback module is highly necessary in speed control, but the high performance speed-controlling strictly allows for a high standard. Speed sensor is a general method for speed feedback. But in practice, there are really many drawbacks for this method. How to eliminate the influence that this sensor bring to the control system pushes us to study the speed sensorless control technology. Now, the study of this technology has become a new hot spot in the AC drive technology research.In this dissertation, the energy shaping control method is in-depth studied, then the speed sensorless control technology of model reference adaptive control based on motor reactive power is brought into this study. The purpose of the technology brought is to estimate speed signal of AC motors, so as to enhance the performance speed-controlling of AC motors.Firstly, the value of this study about the method based on system Energy-Shaping and speed sensorless control is introduced, then various non-linear motor control methods and speed estimation methods are inducted and compared, and the development of these methods are summarized.Secondly, the theoretical foundation of Hamiltonian systems and energy shaping control method are outlined.Thirdly, the mathematical models of Euler-Lagrangian and port controlled Hamiltonian with dissipation(PCHD) system for induction motors are set up, and their own control systems are designed, and the control performance of these systems is validated throughout simulation experiments.Fourthly, the speed estimation method of model reference adaptive control(MRAC) is analyzed and explained, and the speed estimation systems of model reference adaptive control based on the model of motor rotor flux and motor reactive power are designed, and the performance of these speed estimation systems is validated throughout the application in the energy shaping control system.At last, all research achievements in this dissertation and new promising problem worthy to study further are summarized.