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<p>To study harmonic resonance in power grids with wind farms, often impedance models are used that in some cases include the converters’ control systems. However, a key question is whether a wind power plant (WPP) simplified impedance model, ignoring the converters controls, is sufficient for harmonic resonance studies. This research directly tackles that question. This paper analyzes harmonic resonance behavior of a power grid comprised of wind farms with PMSG wind turbines. Hence, two types of impedance models, known as simplified and complete impedance models are extracted, where in the complete impedance model the control of the converter is considered. The frequency scanning (FS) and harmonic resonance mode analysis (HRMA) are subsequently used to examine and compare the system’s harmonic resonance performance under the both impedance models. Next, a comparison is made between the performance of active and passive damping for damping harmonic resonance oscillations. The results show that considering the control of the grid-side converter (GSC) in the impedance model does not cause a noticeable change in the resonant frequencies but it may increase the damping of resonant oscillations. In other words, if the frequency bandwidth of the harmonics is within the bandwidth of the GSC control loop, the simplified impedance models of WTs can be used for harmonic resonance studies. However, for harmonics outside this bandwidth, the complete impedance model is suitable for reliable study.</p>

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Harmonic resonance analysis in PMSG based wind farms: comparison of simplified and detailed impedance models and passive and active damping

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月4日

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  • Ashkan Beiki,
  • Mohsen Rahimi

摘要

To study harmonic resonance in power grids with wind farms, often impedance models are used that in some cases include the converters’ control systems. However, a key question is whether a wind power plant (WPP) simplified impedance model, ignoring the converters controls, is sufficient for harmonic resonance studies. This research directly tackles that question. This paper analyzes harmonic resonance behavior of a power grid comprised of wind farms with PMSG wind turbines. Hence, two types of impedance models, known as simplified and complete impedance models are extracted, where in the complete impedance model the control of the converter is considered. The frequency scanning (FS) and harmonic resonance mode analysis (HRMA) are subsequently used to examine and compare the system’s harmonic resonance performance under the both impedance models. Next, a comparison is made between the performance of active and passive damping for damping harmonic resonance oscillations. The results show that considering the control of the grid-side converter (GSC) in the impedance model does not cause a noticeable change in the resonant frequencies but it may increase the damping of resonant oscillations. In other words, if the frequency bandwidth of the harmonics is within the bandwidth of the GSC control loop, the simplified impedance models of WTs can be used for harmonic resonance studies. However, for harmonics outside this bandwidth, the complete impedance model is suitable for reliable study.