The Research On Sensorless Vector Control Method Of Variable Speed Constant Frequency Wind Energy Generation System

In recent years, the variable speed constant frequency wind generator system is the most widely question for discussion at home and abroad, especially for doubly-fed induction.Because the variable speed constant frequency wind generator system is a kind of nonlinearity and instability system, the system is uncertain, and the building of system model is very difficult; however, the studied subjects of the adaptation control are the kind of systems. It can reduce the effect of system because of uncertainty by correcting parameters of the controller, and can promote the simplicity and robustness of system. The study of emphases is the sensorless vector control of the variable speed constant frequency wind generator system.This paper concludes the research findings of the sensorless vector control in wind generator in recent years, and gives the principle of stator-flux-oriented vector control of double fed wind generator, including the reference frame transformation and the dynamical equation of generator in all kinds of coordinate systems.The basic structure of PI Adaptive System and control theory is introduced, and then speed sensorless vector control system based on PI is formed and simulated. Simulation results show the PI-based field oriented control system has good static and dynamic performance.