The Wind Turbine Generator Independent Variable Pitch Control System Research

Currently, the focus of research in the field of wind power and the difficulty is the study oflarge-scale wind turbine control system, commonly used control strategy in the domestic windpower industry is unified pitch control, its controller based on the size of the wind speed and theoperation of the generator set, draw a value of blade pitch angle, the pitch angle of the three bladesaccording to this value uniform change. Although unified pitch control effective regulation of windenergy utilization can improve the characteristics of the wind turbine output power, but with thedevelopment of wind power technology, also increasing the length of the blade, unified variablepitch control does not mitigate the blade force pat shocks, resulting in unstable output power, thedamage to the power grid when the grid. According to the Independent pitch blade angle of attackweight coefficient based distance control technology, before the grid pitch angle of the three bladesof the wind generator, respectively, can be independently changes, noninterference in the controlprocess, this method of control is by adjusting the angle of attack, so that the force of the blade toimprove the situation, so that the output power and more smooth.This paper first introduces the dynamic of the current development of wind power technologyat home and abroad, then the variable pitch wind turbine aerodynamic principles, analysis of thebasic law of the characteristics of wind speed and variable pitch control and paddle force.Followed by the establishment of the independent variable pitch wind turbine mathematical model,model including wind speed, wind wheel model agency model of pitch, and the doubly-fedinduction generator model and blade angle of attack right coefficient model, and four wind speedsimulation analysis. Independent variable pitch wind turbine control system is much morecomplicated, a servo mechanism requires a high standard of, this article of the electric pitch thepitch servo systems and hydraulic pitch system discussed, by comparison on the structure and cost,selecting the electric pitch control system. Since the independent variable pitch wind turbine has amulti-variable, nonlinear characteristics, traditional PID controller in the pitch of wind power fromthe control system, especially in wind turbines with independent variable pitch control strategy,difficult to obtain a more satisfactory control effect, So I chose a combination of fuzzy control andPID control, fuzzy the PID variable pitch control, and conducted research, Independent pitchdistance parameter self-tuning fuzzy PID controller, the simulation analysis results show that this pitch from the control method can achieve better control effect.Independent pitch wind power system away from an important method of control from thecontrol is present in a foreign country is commonly used. As the wind speed is not uniformlydistributed in space, so unified pitch away from this control strategy paddle force conditions andthe ability to capture wind energy lacking. Pitch from the adaptive fuzzy PID control algorithmcontrol system based on independent pitch based on the coefficient of the blade angle of attackright from the control system to study, through the analysis of simulation results: this controlmethod can improve unevenness of the blade, so that the output power is more stable, relativelysmall impact on the power grid.