基于异步感应发电机的风电场中桨距角控制研究

Study of Pitch Angle Control in Wind Farm Based on Asynchronous Induction Generator

为了研究基于异步感应发电机的风电场对电力系统稳定性的影响,建立了异步感应电机发电机小信号模型;并通过对异步感应电机状态方程的线性化,分析异步感应发电机对电力系统小干扰稳定性及阻尼特性的影响;提出了改进的桨距角控制系统;并将发电机转速偏差信号引入桨距角控制系统。通过对系统进行特征根分析和时域仿真来验证其有效性。结果表明,改进的桨距角控制环节能够改善系统阻尼、提高系统动态稳定性。

In order to study the impact of the wind farm based on the asynchronous induction generator on power system stability, a small-sig- nal model of asynchronous induction generator is built. The generator speed deviation signal is put into pitch angle control system to improve the pitch angle control system by linearizing the equation of state of the asynchronous induction motor and analysis of asynchron~）us induction generator for power system small signal stability and damping characteristics. By eigenvalue analysis of the system and time-domain simulation to verify its validity, the results show that the improved part of the pitch angle control can improve system damping, strengthening the system dynamic Stability. .