摘要
在小扰动稳定意义下,该文提出电力系统与双馈风电场交互作用的边界信号是并网母线频率。以并网点频率为输入,以双馈机组功率为输出的传递函数可以作为风电场动态子系统的数学模型。在研究电力系统机电振荡时,风电场动态子系统可进一步简化为一个复增益环节。因此,风电场等值模型可由一个恒功率源和一个受控功率源组合形成,该模型适用于主导机电模式的简化分析。基于一个三机系统算例,分别用等值模型和详细模型进行机电模式分析,二者分析结果接近,证实了所提等值方法的有效性。
Based on small signal stability signification, the boundary signal, which characterizes interaction of power system and DFIG-based wind park, is considered as bus frequency on the point of integration. A transfer function, employing bus frequency as input signal and using DFIG power as output signal, can be used as a dynamic mathematic model for the wind park. Further more, the model of wind park is simplified to a component of complex gain. In this regard, the aggregated model of a grid-connected wind park, which will be applied to electromechanical mode analysis, is proposed to be assembled with a constant power source and a pow- er source controlled by bus frequency. A three-machine illustration power system, based on both the proposed aggregated model and the detailed model, is investigated and the simulation results verify the proposed equivalent model.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2011年第2期59-63,75,共6页
Proceedings of the CSU-EPSA
关键词
电力系统
双馈感应发电机
风电场等值
小扰动稳定
低频振荡
power system
doubly-fed induction generator（DFIG）
wind farm equivalent model
small-signal stability
low frequency oscillation
