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中文摘要：
为研究永磁直驱风电系统（PMSG）并网后自身的稳定性问题,进行了并网风电系统的模态分析。建立了适用于系统小扰动稳定分析的PMSG风电系统模型,研究了并网风机无穷大系统的模式特性。采用特征值法分析了轴系模型、轴系刚性参数、运行点、并网距离对并网风电系统模式的影响。并在PSCAD/EMTDC上建立了相应的非线性模型,利用Prony方法对输出功率曲线进行模式识别,验证了模态分析结论。研究从模态分析的角度说明了轴系双质块建模的重要性,以及上述参数对并网PMSG稳定性影响的相关结论,结果有助于了解并网PMSG风电系统稳定性问题的本质。
英文摘要：
In order to study the stability of a grid-connected direct-drive permanent magnet synchronous generator （PMSG） wind turbine systems, this paper presents the modal analysis of a PMSG wind turbine system. A PMSG model suitable for small signal stability analysis is presented. The modal properties of a grid-connected PMSG wind turbine system are studied. Then the comprehensive impacts of the shaft model, shaft parameters, operation points and lengths of the transmission line on the modal characteristic of the system are investigated by the eigenvalue analysis method. Meanwhile, the corresponding nonlinear model is set up in the PSCAD/EMTDC, and the output power curve is analyzed by Prony method to validate the modal analysis results. The results show the importance of shaft two-mass model and the relationship between the stability of PMSG system and the system parameters from the angle of modal analysis. It offers a better understanding about the essence of the stability of grid-connected PMSG wind turbine system.
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