Power limitation control of wind turbine system based on differential geometry theory
基于微分几何的风力发电机组恒功率控制

When wind speed exceeds the rated level, power limitation control can be realized through decreasing the rotational speed of the wind turbine to eliminate complex pitch control devices, and a nonlinear controller based on differential geometry theory is designed to achieve the power limitation control for a variable speed wind turbine. First, the wind turbine aerodynamics characteristic is analyzed, which is the theoretical foundation of the power limitation control method proposed. Then, the nonlinear model of wind turbine is globally linearized by differential geometry transformation. Finally, a nonlinear controller is designed based upon the new linearized model, and the globally precise linearized control method of the variable speed wind turbine system is achieved. Simulation results indicate that the control method proposed can effectively implement the power limitation control of variable speed wind turbine system at above rated wind speed, even if the wind speed changes in a large range.