Abstract Wide-frequency range of resonances can occur in HVDC-connected DFIG-based offshore wind farm (OWF), thus induce large harmonic distortion or endanger system stability. Previous studies usually treat OWF as a single-machine system without considering the switching states of individual wind turbines and collecting cables, or ignore the converter responses to wind speed variation and generation control order. In this paper, such factors are included in the modelling of OWF. Their impacts on resonance frequency, amplification level and the occurrence of negative damping are analyzed applying the resonance mode analysis method. Harmonic stability and power quality issues are demonstrated for the frequency range from several Hz to a few kHz. Simulations in MATLAB/Simulink validate the analytical results. Additionally, resonance damping strategies are discussed regarding the identified resonances in widely spread frequencies.

中文翻译：

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双馈离岸风电场与高压直流输电谐振问题研究

摘要 与高压直流相连的双馈型海上风电场（OWF）会产生宽频率范围的谐振，从而引起较大的谐波失真或危及系统稳定性。以往的研究通常将 OWF 视为单机系统，而不考虑单个风力发电机和收集电缆的开关状态，或者忽略转换器对风速变化和发电控制顺序的响应。在本文中，这些因素都包含在 OWF 的建模中。应用共振模态分析方法分析了它们对共振频率、放大水平和负阻尼发生的影响。在几赫兹到几赫兹的频率范围内证明了谐波稳定性和电能质量问题。MATLAB/Simulink 中的仿真验证了分析结果。此外，