作　　者： ; ; ; ; ;

机构地区： 南京信息工程大学

出　　处： 《高电压技术》 2020年第1期115-122,共8页

摘　　要： 为了研究风力发电机组与雷电能量的耦合特征,在中国气象局广州野外雷电试验基地设计开展了试验研究。2011年7月30日的一次人工触发闪电试验中,测量得到了触发闪电电流和风机塔筒内的感应电压及感应电流。此次试验测得的触发闪电电流为衰减振荡波形的先驱脉冲电流,通过分析可知,先驱脉冲电流各个脉冲的幅值达到了850~1162.5 A;频谱为一单峰曲线,幅值呈单调快速增加趋势,在频率为351.875 kHz处幅值达到峰值,随后幅值呈单调快速衰减趋势,先驱脉冲电流能量主要集中在0~800 kHz低频段内。风机塔筒内发电机相线L2上感应电压峰值达到-8.876 kV,控制线CL上测得的感应电压峰值达到2.39 kV,发电机相线L1—L3回路测得的感应电流峰值达到1.118 kA,双绞方式敷设的回路上感应电流的峰值仅为-60.55 A。风机周围发生闪电时,风机塔筒内部电子电气线路上产生的感应电压和感应电流已经超过了终端设备的耐受水平,可能会造成其损坏。高磁导率材料可对低频段闪电磁场进行屏蔽。双绞布线方式可以最大程度降低信号线路对雷电能量的耦合。 In order to study the energy coupling characteristics from lightning to wind turbines,tests were designed and carried out in Guangzhou Field Experiment Base for Lightning Research and Testing of China Meteorological Administration.The trigger lightning current,induced voltage,and current inside the wind turbine tower were measured during an artificially triggered lightning experiment on July 30,2011.The trigger lightning current measured in the experiment belongs to precursor pulse current with damped oscillation waves.The analyses show that the pulse amplitude of the precursor pulse current can reach 850~1162.5 A;the spectrum is a single peak curve;the amplitude monotonically rises rapidly and reaches the peak value at the point of 351.875 kHz;then,the amplitude attenuates monotonically and rapidly;the energy of precursor pulse current mainly concentrates on the low frequency range of 0~800 kHz.The peak value of induced voltage in phase line L2 of generator inside the wind turbine tower reaches-8.876 kV;the peak value of induced voltage in controlling line reaches 2.39 kV;the peak value of induced current in generator’s phase L1—L3 circuit is 1.118 kA;the peak value of induced current in twisted pair laying circuit is only-60.55 A.The induced voltage and current in electronic and electrical circuits inside the wind turbine towers may exceed the insulation level of terminal equipment and cause damage when lightning occurs.High-permeability material can be used to shield the low frequency magnetic field caused by lightning.Energy coupling from lightning to signal lines can be reduced to the lowest level through the twisted pair wiring mode.

关 键 词： 风机 人工触发闪电 先驱脉冲电流 频谱分布 感应电压 感应电流

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