The Study About Variable-pitch Control Methods Based On Fuzzy Control

This paper develops the model of the variable-pitched wind turbine system on the basis of analyzing it's math model,designs the traditional PID controller,Fuzzy controller and Variable universe based on Fuzzy Controller for the part of variable-pitch control in system, then simulate under different wind speeds.Although PID controller is simple and has better stability,it requires precise parameters and neglect the system non-linearity in the design process. The mathematical model of the wind power generation system is complex,strongly affected by the varying parameters and exterior disturbing,and has the features of nonlinear,time change and coupling.According to the above characteristics,the fuzzy logic control is introduced into the wind power system.By using the fuzzy controller and the Variable universe based on Fuzzy Controller as the controller of the variable-pitch system,when the wind speed is higher than the rated speed,the angle and the power output are adjusted according to the change of the wind speed,which makes the output of the wind power unit remain stable.The Matlab simulation results show that the new wind power system has the better response speed and less overshoot.