Oscillation issues of permanent magnet synchronous generator (PMSG) wind turbines (WTs) have an increasingly significant impact on grid stability, especially with their increased generation capacity. However, the machine-side model (MSM), involving machine-side converter (MSC) and generator, is generally simplified as an ideal voltage source to comprising the impedance model of a PMSG-WT used for stability analysis, thus causing deficiency in describing the machine dynamics. Besides, the impedance-based method considering the PMSG-WT as a black box only describes the system from the external output characteristics; as such, the shaping effect of the internal controllers on the impedance model has not been fully studied yet. This article proposes the impedance model of PMSG-WTs consisting of generator, MSC, dc-bus and grid-side converter (GSC) for more accurate stability analysis. Furthermore, based on the general Nyquist criteria (GNC) and eigenvalue sensitivity analysis method, the shaping effect of the controllers inside GSC and MSC on the PMSG external impedance is quantitatively studied. The influence of the MSM on the system stability is investigated by comparing with the simplified model through extensive simulation studies.

中文翻译：

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PMSG风力发电机组的阻抗建模和控制器整形效果分析

永磁同步发电机（PMSG）风力涡轮机（WTs）的振动问题对电网稳定性的影响越来越大，尤其是随着发电容量的增加。但是，通常将包含机器侧转换器（MSC）和发电机的机器侧模型（MSM）简化为理想电压源，使其包含用于稳定性分析的PMSG-WT的阻抗模型，从而造成描述上的不足。机器动力学。此外，将PMSG-WT视为黑匣子的基于阻抗的方法仅从外部输出特性来描述系统。因此，内部控制器对阻抗模型的整形效果尚未得到充分研究。本文提出了由发电机，MSC，直流母线和电网侧转换器（GSC），可进行更准确的稳定性分析。此外，基于一般的奈奎斯特准则（GNC）和特征值灵敏度分析方法，定量研究了GSC和MSC内部控制器对PMSG外部阻抗的整形效果。通过广泛的仿真研究，通过与简化模型进行比较，研究了MSM对系统稳定性的影响。