风电机组的雷击过电压的分析.pdfVIP

第28 卷 第4 期 电 网 技 术 Vol. 28 No. 4 2004 年2 月 Power System Technology Feb. 2004 文章编号：1000-3673 （2004 ）04-0027-03 中图分类号：TK83 ；TM863 文献标识码：A 风电机组的雷击过电压分析 赵海翔，王晓蓉 （中国电力科学研究院，北京100085） OVERVOLTAGE ANALYSIS OF WIND TURBINES DUE TO LIGHTNING STROKE ZHAO Hai-xiang, WANG Xiao-rong （China Electric Power Research Institute, Beijing 100085, China ） ABSTRACT: Lightning stroke is one of the important factors 机·年的雷击率基本在 10 % 左右，在所有引发风 affecting the secure operation of wind farm. During the 电机组故障的外部因素（如风暴、结冰、雷击以 lightning stroke process the induced overvoltage may appear 及电网故障等）中雷击约占 25% [1] 。在我国，雷 on the sensors, communication line and even the power line 击损坏情况最严重的是海南东方风电场，近年来 which are configured within the stander and barrel tower when [2] 仅风机叶片的雷击损坏率就达5.56 片/百片·年 。 lightning current passes through them, the normal operation of 雷击造成风电机组损坏的机理是复杂的。雷 wind turbines will be affected by these transient overvoltage. In this paper the model of wind turbines is established and the 击产生的过电压是造成风电机组损坏的主要原因 transient overvoltage caused by lightning stroke is calculated 之一。对不同地区风电场的雷电流波形测量结果 and analyzed. The calculating results show that the maximum 统计分析发现，对风电机组危险性最大的是峰值 of the overvoltage between the barrel tower and the 较低的雷电流[3] ，这些快速变化的雷电流将产生暂 transmission line will appear at the up end and the lower end. It 态磁场，而暂态磁场可以通过感应和辐射对周围 can reduce the capacitive coupling overvoltage by setting metal 的电子系统造成危害[4] 。此快速变化的磁场在位于 shielding layer. Moreover, the shi