不同风力发电机组同时并网稳定性分析

针对不同类型风电机组并网对电力系统稳定性的影响，提出了一种系统稳定分析方法。以异步风电机组、双馈风电机组和永磁直驱风电机组为例，详细介绍了其动态数学模型。阐述了电力系统稳定性分析的方法，包括基于特征根的小干扰稳定分析和基于动态时域的暂态稳定分析。基于8机24节点系统进行了仿真实验。从特征根分析结果和动态响应曲线可知:异步风电机组并网对系统动态性能的影响较小；而双馈风电机组和永磁直驱风电机组并网对系统动态性能的影响较大，系统趋于不稳定。

Stability analysis for wind power integration with different WTGS

Aimed at the influence of different wind turbine generator systems (WTGS) integration on power system, a stability analysis method is proposed.Taking dynamic models of squirrel cage induction generator (SCIG), doubly fed induction generator (DFIG) and permanent magnet generator (PMG) as examples, their dynamic mathematical models are introduced in detail. Then, the method of power system stability analysis is expounded, including small signal stability analysis based on characteristic root analysis and transient stability analysis based on dynamic time domain. The simulation experiments are carried on with 8-unit 24-bus power system. The characteristic root analysis results and the dynamic response curves show that SCIG have less effect on the system dynamic performance, while DGIG and PMG have more influence on the system dynamic performance, as a result, the power system tends to be unstable.