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首页> 外文期刊>Electric power systems research >Isolated vs. Interconnected Wind Turbine Grounding Systems: Effect on the Harmonic Grounding Impedance, Ground Potential Rise and Step Voltage
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Isolated vs. Interconnected Wind Turbine Grounding Systems: Effect on the Harmonic Grounding Impedance, Ground Potential Rise and Step Voltage

机译：隔离与互连风力涡轮机接地系统：对谐波接地阻抗，接地电位上升和阶跃电压的影响

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摘要

Wind turbines are very vulnerable to lightning strikes due to their height, sharp edges and remote locations often with high soil resistivity. In this paper we present numerical simulations of the impedance of a typical wind turbine grounding geometry. We analyze the influence of interconnecting grounding systems of different wind turbines. IEC TR61400-24 suggests interconnection of grounding electrodes of wind turbines through horizontal electrodes (in the form of insulated or bare conductors) to achieve low steady-state grounding resistance. The analysis takes into account the frequency dependence of the soil electrical parameters. We show that the low frequency grounding impedance can be reduced by a factor of two or more as a result of interconnecting grounding systems. However, the reduction is significantly lower at higher frequencies because of the interconnection wire's inductance. We analyze the spatial distribution of the ground potential rise and step voltage in response to typical first and subsequent lightning return stroke current waveforms. It is shown that both, ground potential rise and step voltage can be significant along the wire, especially for high resistivity soil, and placing sensitive equipment near the interconnecting wire should be either avoided, or insulated wire should be used.
机译：由于风力涡轮机的高度，锋利的边缘和偏远的位置（通常具有较高的土壤电阻率），因此非常容易遭受雷击。在本文中，我们介绍了典型风力涡轮机接地几何形状的阻抗的数值模拟。我们分析了互连不同风力涡轮机接地系统的影响。 IEC TR61400-24建议将风力涡轮机的接地电极通过水平电极（以绝缘或裸导体的形式）互连，以实现低稳态接地电阻。该分析考虑了土壤电参数的频率依赖性。我们表明，由于接地系统的互连，低频接地阻抗可以降低两倍或更多。但是，由于互连线的电感，在较高的频率下，降低幅度明显较低。我们根据典型的第一个和随后的雷电回击电流波形，分析了地电位上升和阶跃电压的空间分布。结果表明，沿导线的地电位上升和阶跃电压都可能很大，尤其是对于高电阻率土壤，应避免在互连导线附近放置敏感设备，或使用绝缘导线。

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