风电机组对电力系统暂态稳定性影响分析

Analysing the Impact of Wind Plant on Power System Transient Stability

风电机组作为环境友好型发电的最大来源在电网中的规模日益扩大,必将影响电力系统的稳定性。文章首先对比了恒速异步(CSWT),双馈变速(DFIG)及直驱同步(DDSG)等市场上广为应用的三种风电机组的结构,分析了各个机组的降阶数学模型;通过一款基于Matlab的电力系统分析工具箱PSAT研究了不同故障持续时间下的风电机组暂态稳定性和系统暂态稳定性,对三种机组及其系统的暂态稳定性进行了分析对比;最后讨论了风力发电机组参数对机组暂态稳定性的影响,得知,发电机参数Rr的增加和Xr、Xs的减小有利于恒速风电机组暂态稳定性的提高,Xm、Rs对机组暂态稳定性影响不明显。

As the most environmental friendly source of power generation,wind power turbines are expanding in the grid.It will also have a broad and deep impact on power system stability.In this paper,a comparison of reduced-order models is made among three mainly used wind turbines which are constant speed wind turbine（CSWT）,doubly fed induction generator（DFIG） and direct drive synchronous generator（DDSG）.Then a MATLAB-based power system analysis toolbox（PSAT） is used for investigating the dynamic behavior of three generators in different fault clearing time.At last,the impact of wind turbine parameters on the wind turbine stability is discussed.A conclusion is drawn that with the increase of Rr and decrease of Xr,Xs is benefit to the transient stability.