L2 robust control for brushless doubly-fed wind power generator

Based on the analysis of the wind turbine operation characteristics, the essence of the maximum wind energy tracking problem is transformed into the speed control problem of the generator. For the variable speed constant frequency brushless doubly-fed wind power generation system suffering from the wind energy uncertainties and instability, the model is established, and the disturbance signals are bounded by L₂ norm. L₂ robust control method is adopted to design a controller, which has the invariable structure and parameters to guarantee the system to meet performance requirements under the worst uncertainties. The proposed robust controller enables the generation system to be better in robustness against parameters uncertainties, to rapidly track the wind speed, and further to achieve the maximum wind energy tracking, which is helpful to enhance the wind energy efficiency.