摘要
从首次短时间正雷击和首次短时间负雷击的雷电流波形出发,根据雷电流的累积概率密度函数和概率加权算法推导出在雷电流激励下机组上出现暂态过电压的统计计算公式。在建立集桨叶、轴承、塔筒和接地装置于一体的风电机组暂态等值电路模型后,运用实验结果对该模型进行校验。以该暂态等值电路模型为基础,统计计算风电机组上的暂态过电压,确定过电压沿风电机组本体的分布特性,并将该过电压统计值与采用标准规程法计算出的过电压值进行对比。结果表明,在同样的雷电流波形条件下,暂态过电压的统计值明显低于规程法计算的暂态过电压值。
The incident of lightning striking to wind turbines(WTs)has an obvious randomness.Accordingly,the transient overvoltage caused by the lightning strike exhibits a random behavior and need to be calculated by employing the statistical analysis method.In order to meet this practical need,a statistical algorithm is proposed in this paper to calculate the transient overvoltage under positive and negative lightning strikes.The algorithm gives a probability weighting formula of the statistical overvoltage in terms of the probability density function of lightning current.Then,a complete circuit model is built for the WT by integrating the equivalent circuits of blade,bearing,tower and grounding system.The validity of the circuit model is verified by the reduced-scale experiment.On the basis of the circuit model and statistical algorithm,the statistical value of the transient overvoltage is obtained and its distribution along the WT body is further determined.The statistical overvoltage is also compared with the non-statistical one calculated from the technical specification to examine the difference between them.
作者
陶世祺
张小青
王耀武
苏萌萌
林炎华
Tao Shiqi;Zhang Xiaoqing;Wang Yaowu;Su Mengmeng;Lin Yanhua(Shool of Electrical Engineering,Beijing Jiaotong University,Beijing100044,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2018年第11期3261-3269,共9页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51420105011)
关键词
风电机组
雷击
概率密度函数
统计过电压
电路模型
wind turbines
lightning
probability density function
statistical overvoltage
circuit model
