近年来，风电因其成本降低、技术进步及政府政策支持等因素获得了迅猛发展。目前并网型风力发电机组主要包括笼型异步发电机（Squirrel Cage Induction Generator，SCIG）、双馈异步发电机（Doubly Fed Induction Generator，DFIG）和永磁同步发电机（Permanent Magnet Synchronous Generator，PMSG）。因负荷中心和风电场分布不匹配，通常采取在交流输电线路添加串联补偿电容的措施进行电能输送，并通过安装电力电子器件以期达到增加输送容量、调节潮流和提高系统稳定性的目的，但这些措施同时也增加了电力系统发生次同步振荡（Sub Synchronous Oscillation，SSO）的风险。本文以大规模风电接入电网为背景，对电力系统稳定中的SSO及轴系扭振问题进行了较为深入的研究工作，主要成果归纳如下： 基于改进的IEEE第一标准模型分别建立了含SCIG型、DFIG及PMSG型风电场单机算例系统的详细数学模型，同时本文应用一种智能优化算法对DFIG和PMSG型风电场中变流器控制系统的PI参数进行了优化。针对多机算例系统，分别建立了火电机组、风电机组、母线集中等值并联电容、传输线路和负荷等元件的详细数学模型，并提出了一种多机系统状态矩阵的生成方法，为分析含风电场电力系统SSO及轴系扭振问题奠定了基础。 利用特征值分析法结合参与因子分别对含SCIG型、DFIG及PMSG型风电场单机算例系统进行了仿真分析。其中，针对含SCIG型风电场单机算例系统，主要研究线路串补度和并联补偿电容变化对系统中各振荡模式的影响情况；针对含DFIG及PMSG型风电场单机算例系统，主要研究线路串补度、变流器控制系统PI参数和风速变化对系统中各振荡模式的影响情况。通过对这三种类型算例系统仿真结果的比较分析，得出了一些有意义的结论。 利用特征值分析法结合参与因子分别对无风电场接入、含DFIG及PMSG型风电场的多机算例系统进行了仿真分析。首先研究无风电场接入多机算例系统的情况下，不同传输线路串补度变化对所研究火电机组的扭振模式和次同步模式的影响；紧接着研究DFIG和PMSG型风电场分别替换除所研究火电机组之外的其它机组后，不同传输线路串补度变化对所研究火电机组的扭振模式、风电机组的扭振模式和次同步模式的影响；并将含风电场与无风电场接入情况下的结果进行了比较分析，获得一些初步的结论。

In recent years, wind power has been developing rapidly due to a series of factors involving cost decrease, technological progress, and policy support from government etc. Currently, the grid-connected wind generators mainly include the Squirrel Cage Induction Generator (SCIG)- based fixed-speed wind generator without power converter interface, the Doubly Fed Induction Generator (DFIG)- based variable-speed wind generator with reduced-capacity converter, and the Permanent Magnet Synchronous Generator (PMSG)- based variable-speed wind generator with full-capacity converter. As load centers and wind farms are usually asymmetrically distributed, the series-compensated AC transmission lines equipped with a variety of power electronic devices are generally configured to improve the transmission capacity, power flow control capability and system stability, which may increase the risk of subsynchronous oscillation (SSO) in power system simutaneously. Based on the integration of large-scale wind power, this thesis will deeply explore and exploit the issue of SSO and torsional oscillation of the power system stablility. The main achievements are summarized as follows: The detailed mathematical models of the modified IEEE first benchmark model based single machine test systems incorporating SCIG-based wind farm, DFIG- and PMSG- based wind farms are derived respectively. Besides, an intelligent optimization algorithm is employed to implement the optimization of the PI parameters of the converter control systems in DFIG- and PMSG- based wind farms. As for the multi-machine test system, the detailed mathematical models of steam turbine generator, wind farm, equivalent shunt capacitor of bus, transimission line and load are derived. An approach to form the state matrix of the multi-machine system is proposed in this thesis, which lays a good foundation for analyzing SSO and torsional oscillation problem in power systems incorporating wind farms. The eigen-anlysis along with participation factors is applied during the simulaton analysis of the single machine test systems incorporating SCIG-based wind farm, DFIG- and PMSG- based wind farms respectively. As for the single machine test system incorporating SCIG-based wind farm, the impacts of variations of series compensation level and shunt compensation capacitor on the oscillatory modes of the test system are studied. Regarding the single machine test systems incorporating DFIG- and PMSG- based wind farms, the impacts of variations of series compensation level, the PI parameters of the converter control systems, and wind speed on the oscillatory modes of the test system are discussed. Based on the comparative analysis of the simulation results pertinent to the three types of test systems, some meaningful conclusions are summarized. The eigen-anlysis along with participation factors is applied during the simulaton analysis of the the multi- machine test systems not considering wind farm integration and incorporating DFIG- and PMSG- based wind farms. The impacts of variations of the series compensation levels of different trasimission lines on the shaft modes of the studied steam turbine generator and the sub-synchronous mode for the test system not considering wind farm integration are studied at first. Then the impacts of variations of the series compensation levels of different trasimission lines on the shaft modes of the studied steam turbine generator, the shaft mode of the wind farm, and the sub-synchronous mode for the test system are discussed when one of the steam turbine generators (except for the studied one) is replaced by the DFIG- and PMSG- based wind farms, respectively. The comparative analysis based on the simulation results of the multi-machine test system considering wind farm integration or not is performed elaborately in this thesis, and some fundamental conclusions are drawn.