Study On Speed Sensorless Vector Control Of Induction Motor

With the dramatic development of electronic technology and computer science, the speed regulation technology of alternating current machine based on them has made considerable progress. The speed-sensorless vector control of induction motor has become a focus gradually as an important approach direction in modern alternating current machine control.Speed-sensorless vector control strategies of induction motor are studied in this thesis. Firstly, research for control strategies of alternating current induction motor in recent years was introduced, and the advantages and disadvantages of different strategies were compared. Based on the theory of electromagnetism field, the mathematical model building of alternating current induction motor is educed in different coordinates, including the model in 3-phase coordinate, the model in 2-phase coordinates. And the principle of vector control and coordinate conversion is also presented, it offers the further theoretical foundation of the research of the speed-sensorless vector control system of induction motor.Based on Luenberger's observations and accounted for effect rotor resistance on field oriented control, an identification method of rotor resistance identification based on model reference adaptive control is presented, and this system composed of above the observer with rotor resistance identification meets with Popov's theory. Several speed estimate methods are presented and compared.The principle of extended Kalman filter and its application in the vector control system are the emphasis of this thesis, and a model of the speed-sensorless vector control system based on extended Kalman filter is built under the environment of...