Study on Properties of Pitch Control for Wind Turbine

Key Words: Wind Turbine(풍력터빈), Pitch PI Controller(피치PI 제어기), Aerodynamic Nonlinearity(공기역학적비선형성), Linearization(선형화), Closed-Loop Pitch System(폐루프피치계)초록: 블레이드와바람의상호작용에의해발생하는풍력터빈의공기역학적토크와파워의특성은매우비선형적이다. 그러므로풍력터빈의전체동적거동은풍속의크기에따라서비선형적인특성을가진다. 공기역학적비선형성은또한풍력터빈제어시스템의특성에영향을미치므로, 풍력터빈제어기를설계하기위해서는비선형적인공기역학적특성들에대한해석을통한고찰이필연적이다. 본논문에서는정격파워이상에서풍속크기에따른비선형적인공기역학적특성들과이비선형성들이PI 제어기를가지는폐루프피치계에미치는영향들을1-질량모델의풍력터빈에대하여살펴본다.Abstract: The aerodynamic power and torque of wind turbines are extremely nonlinear. Therefore, the overalldynamic behavior of a wind turbine exhibits nonlinear characteristics that are dependent on the magnitude ofthe wind speed. The nonlinear aerodynamic characteristics of the wind turbine also affect the characteristics ofthe control system of the wind turbine. Therefore, the analysis of the nonlinear aerodynamic characteristics ofwind turbine is essential in designing the wind-turbine controller. In this study, the nonlinear aerodynamiccharacteristics and the effects of these characteristics on the closed-loop pitch system with PI controller for an1-mass model of the wind turbine are investigated above rated power.