In order to solve the problems of large delay and uncertain impact on automatic voltage control system in traditional doubly-fed wind farm,a small interference analysis model for grid connected system of doubly-fed wind farm including automatic voltage control is established.Firstly,considering the nonlinear link in automatic voltage control,the small interference model for grid connected system of doubly-fed wind farm with delay link is deduced,and the small interference model of doubly-fed wind farm is formed by using the linearization principle to describe the expressions of damping torque of doubly-fed wind farm.Next,the expressions of active power increment and power angle increment of doubly-fed wind farm are obtained through the small interference model.Finally,the effectiveness of the proposed model is verified by comparing the calculation with the simulation results.The results show that the proposed model can describe the damping component of doubly-fed wind farm under small disturbance,which provides a theoretical basis for the study of doubly-fed wind farm stability.
doubly-fed wind farmdelayautomatic voltage controldamping torque
NETL
NSTL
万方数据
