双馈与直驱风电机组的小干扰稳定性对比分析

Analysis on the Impact of DFIG and DDSG Wind Plant on the Small Signal Stability of the Power System

清洁能源在电力系统中的大规模利用,使得风电机组在电网中的占比日益扩大,其运行特性极大地影响电力系统的运行稳定性.本文分析了双馈变速与直驱同步风电机组的结构特点,建立了各个机组的降阶数学模型.在此基础上,对两区域系统进行了仿真计算.研究表明:风电机组并网增加了系统与风电机组强相关的振荡模式,且有很好的阻尼特性.当风电机组在系统中容量比例提高时,双馈机组会减弱新增局部振荡模式的阻尼,直驱机组能提高区域内相关的局部振荡的阻尼.

With the development of clean energy in the electric power system,wind power has been uti-lized in large scale ,but its characteristics will deeply affect the stability of the power system.This paper compared the wind turbine structure of the doubly-fed induction generator （DFIG）and direct drive syn-chronous generator （DDSG）,and analyzed their reduced order model.Wind power turbines were added to the system of two regional systems.The systems had good damping properties,but the systems＆#39;damping model was changed significantly.When wind power generator capacity increased in the system,doubly-fed induction generator could weaken the new local oscillation mode damping.Direct drive synchronous gener-ator could enhance the region associated with a local oscillation damping.