风电机组运行稳定性研究

Research of Operation Stability of Wind Turbine

大型风力发电机组是复杂的多变量非线性动力学系统,具有不确定性和多干扰性,导致难以获取风电机组精确的数学模型。为了保证风力发电机组的稳定运行,设计了一个稳定的状态反馈控制器,在风速低于额定风速时,通过控制发电机转矩调整发电机的转速,使风轮转速达到期望转速,最大限度地捕获风能。通过状态转换将原问题转换成系统在原点稳定的问题,再通过李雅普诺夫函数找到合适的参数,进而设计出控制器。之后给出了该系统的稳定性证明,并基于该控制器,计算出了风机运行的稳定域。最后利用Simulink搭建了风力发电机组控制仿真平台,并进行了数值仿真。结果显示控制系统具有良好的稳定性和期望的动态特性,表明该控制器取得了较好的控制效果,且在风机运行稳定域内,系统能稳定运行。该方法设计简单,不包含复杂的控制算法,具有一定的实用价值。稳定域的提出,为风机正常运行提供了理论依据。

Large wind turbines are complex multi-variable nonlinear dynamical system with uncertainties and multiple interference,making it difficult to obtain wind turbine precise mathematical model. In order to ensure the stable operation of the wind turbine,a stable state feedback controller was designed, when the wind speed is below the rated wind speed,generator torque adjusted by controlling the rotational speed of the generator of the wind turbine speed reaches the desired speed ,maximum wind energy capture. By state converting,the original problem is converted into a state system stability is- sues at the origin,and then find suitable parameters by Lyapunov function,and then design a controller. The stability of the sys- tem was proofed,and based on the controller calculates the stability region of the wind turbine is running. Finally a wind turbine control simulation platform was built by Simulink,and numerical simulation results show that the control system has good dynamic stability and desired characteristics,indicating that the controller has achieved good control effect and stable operation of the wind turbine within the system stable region The design method does not contain the complex control algorithms,which is not only simple,but also has some practical value. Stability region provide a theoretical basis for the operation of wind turbine.