Research On Model-free Adaptive Control Of Electric Pitch System

As a new energy, wind power has attracted the attention of the world, study of highly efficient and reliable wind power generation system is the potential of the trend now. With the development of superpower and intelligence, the significance of research on pitch control technology is obvious. This thesis use model-free adaptive control to the system of the electrical pitch for a more in-depth research.The thesis first presents the basic theory of the aerodynamics and the control requirements of wind power pitch system, then combination of the two gives the basic strcture of the electric pitch servo system and control strategies and the implementation of the type of motor. Through the analysis of the induction motor, according to the principle of vector control, the mathematical model of induction motor in the rotor flux under the conditions of the simplified, designed for current loop inner ring and time outside loop speed, position loop for outer ring three closed-loop control scheme.For the characters of its nonlinear and strong coupling, an accurateis is not easy to build, there would be no model adaptive control method was applied to the systerm based on the scheme of electrical pitch control system three closed-loop. In order to make the current loop has good dynamic index, in combination with the characteristics of simple structure, design for PI adjuster; for the speed loop and position loop, make them to the tight format and partial format linearization separately, builded no model of adaptive controller based on two linearized algorithm, so, the goal of without disturbances speed control and no overshoot position control has been realized, also solve the model problem. From the simulation results can be seen, that no model adaptive controller based on the electrical pitch control can achieve expected control effect.Finally, the thesis regarded the1MW wind power systems as the research object, builed the unified power simulation based on no model adaptive control, inspects whether the wind power systerm that under the control is distortion or not. According to the simulation result, when the wind speed higher than rated, the electrical pitch system began to paddle, adjust the angle of the blade size in real-time, realized constant power output, and meet the fluctuation range, also from the side inspeted the electrical pitch servo system adopts the no model adaptive control method is feasible.