Analysis On Aerodynamic Loads And Research On Technology Of Intelligent Individual Pitch Control Of Wind Turbine

Instability is the characteristics of the wind energy, due to the factors such as wind shear, tower shadow and turbulence, wind speed in the wind wheel plane is uneven distribution, causing the aerodynamic loads of wind turbine imbalance. With the development of the large-scale wind turbine, wind wheel radius is increasing, the vibration of wind turbine components is being aggravated by imbalance load, that will lead to serious fatigue damage of the wind turbine. To solve the questions of vibration, fatigue and dynamic stability, reduce the load fluctuations on the impact of wind turbine, the imbalance load of wind turbine must be controlled and regulated.Based on the aerodynamics and pitch control theory, for the problem of imbalance load caused by wind shear and tower shadow, this article in-depth study that the aerodynamic loads and individual pitch control strategy of the MW level horizontal axis wind turbine. Both GH Bladed and MATLAB are used to establish a real wind turbine model, blade element and momentum theory is adopted to establish blade load calculation model by programming in MATLAB. Because of the imbalance of the flapwise load, this article design a individual pitch control strategy that based on load control according blade azimuth signal, design the individual pitch controller, and establish the individual pitch controller model by programming in MATLAB.This article can obtain individual pitch angle command and aerodynamic loads of wind turbine after the individual pitch control by individual pitch control model simulation. Simulation results show that the amplitude of flapwise load significantly reduced, and the output power of wind turbine remains stable, indicate that the design of the individual pitch controller has a remarkable effect.