基于高速摄像观测的风电场雷击风机发展过程和特性分析

Development Process and Characteristic Analysis of the Natural Lightning Strike on Wind Turbine Based on High-Speed Camera Observation

该文主要分析张北风电场风机自然雷击过程的高速摄像光学资料,该雷击风机事件共发生了七次回击过程,有两个主要的闪电通道。前三次回击和后四次回击分别在不同的闪电通道进行。在回击之间出现了多次的企图先导,回击前的先导都是无分支的直窜型的先导。七次回击前的先导都在2ms内发展到回击,先导的平均二维发展速度都在10^(6)m/s数量级及以上,其中第五次回击前先导的平均发展速度最快,大于1.1×10^(7)m/s,第六次回击前的先导发展速度最小为2.62×10^(6)m/s。七次回击中第四次回击的相对发光总量最大,第三次相对发光总量最小。各次回击的相对发光总量和回击前的截止时间随回击次序的变化呈明显的线性正相关,各次回击的相对发光总量和回击前的先导平均发展速度呈相反的发展趋势。

The optical data of a natural lightning stroke of wind turbine is analyzed in Zhangbei wind farm.There are seven return strokes and two main lightning channels.The first three return strokes and the last four return strokes are carried out in different lightning channels.There are many attempted leaders between the return strokes,and all the leaders before the return stroke are dart leaders without branches.The average 2-D development speed of the leader is 10^(6)m/s and above.The average development speed of the leader before the fifth return stroke is more than 1.10×10^(7)m/s.The slowest development speed of the leader before the sixth return stroke was 2.62×10^(6)m/s.The total relative emission of the fourth return stroke was the largest,and the third was the smallest.There is a significant linear positive correlation between the total relative luminescence of each return stroke and the cut-off time with the change of the return stroke order.The total relative luminescence of each return stroke and the average development speed of the leader before the return stroke show an opposite development trend.