基于微分几何的风力发电机组恒功率控制

当风速超过额定值时, 可以通过降低风力机的转速实现恒功率控制从而避免使用复杂的变桨距机构, 本文基于微分几何理论设计了非线性控制器, 实现了变速风力发电机组的恒功率控制. 首先, 分析了风力机的空气动力学特性, 这是所提出的恒功率控制方法的理论依据; 然后, 通过微分几何反馈线性化变换, 将风力机的非线性模型全局线性化; 最后, 基于新的线性化模型设计了非线性控制器, 实现了变速风力机的全局精确线性化控制. 仿真结果表明, 所提出的控制方法在风速大范围变化的情况下能有效的实现变速风力发电机组额定风速以上的恒功率控制.

Power limitation control of wind turbine system based on differential geometry theory

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.