变速恒频风力发电机组中长期时间尺度建模

Medium and Long-Term Time Scale Modeling for Variable Speed Constant Frequency Wind Turbines

风能具有随机性与间歇性的特点,模拟由此引起的中长期时间尺度上的动态过程对含风电的电力系统规划与运行有重要的意义。建立了变速恒频风力发电机组的机电暂态模型,包括风速模型、风力机及传动轴系模型、桨距角控制模型、换流器控制模型以及发电机和换流器模型。按照准稳态近似方法对机电暂态模型进行简化,保留中长期时间尺度的时间常数,得到适用于准稳态仿真的变速恒频风力发电机组中长期时间尺度模型。最后通过对比分析准稳态模型和机电暂态模型的仿真结果,验证了所建模型能够准确刻画中长期时间尺度上的动态过程。

Wind energy is characteristic of random and intermittence,therefore it is of great significance to the plan and operation of the power system containing wind power to simulate the dynamic process in the medium-and long-term time scale. The electromechanical transient model of the variable speed constant frequency wind turbine is established in this paper,including the wind speed model,wind turbine and shaft system model,the pitch angle control model,converter control model and generators and inverter model. The electro-mechanical transient model is simplified with the quasi-steadystate approximation method, and the time constant of the medium-and long-term time scale is remained,and the wind turbine model adapted to the quasi-steady-state simulation is obtained. Finally,by comparing the simulation results of the quasi-steady-stat e model with the electromechanical model,the accuracy of the quasi-steady state simulation model is validated.