中文摘要：

雷击是影响风力发电机组安全运行的重要因素之一。风力机遭受雷击时,风力机塔座、内部控制电缆的线芯及电缆屏蔽层均会产生感应电压。为了更好地研究雷击风力机时引起的暂态过电压,建立了包括风力机叶片、塔筒和信号电缆的等效模型,同时计及电感和电容的电磁感应电压作用,并运用ATP/EMTP电磁暂态仿真软件进行仿真计算,最后分析了风力机接地电阻、雷电流波形和塔筒高度3种因素对风力机中信号电缆感应电压的影响。研究结果表明,波前时间和屏蔽层与芯线间的电压差值成反比关系,波前时间1.2μs时塔筒顶部的电压差值是波前时间20μs时的1 611.6倍;塔筒越高,该电压差也越大;接地电阻与塔基处地电位成正比关系,接地电阻为10？时的塔基电压是接地电阻为1Ω时的8.4倍。

英文摘要：

Lightning stroke is one of the most important influences on secure running of wind turbine generator （WTG）. The base of wind turbine, the core of internal controlling cable, and the cable shielding layer will generate induced vol- tage when the WTG suffers from lightning stroke. Considering electro-magnetic inducted voltages of inductance and capacitance, we build an equivalent model including wind turbine blade, tower and signal cable to study transient over- voltage caused by lightning stroke bettor. Furthermore, the simulation is conducted by utilizing ATP/EMTP electro-magnetic transient simulator. Finally, we analyze the influence of wind turbine signal cable on induction voltage by three factors, such as the wind turbine grounding resistance, the lightning current waveform, and the height of tower. The results show that wave head time is inversely proportional to voltage, when wave head time is 1.2 μs, voltage differ- ence in the top of the tower is 1 611.6 times larger than 20 μs; the higher tower is, the greater the voltage difference is; grounding resistance is proportional to the ground potential of tower base, when the grounding resistance is 10 t, the voltage of tower base is 8.4 times larger than 1 Ω.