摘要
海上风电场长期运行于潮湿、高盐环境,研究盐雾环境对雷击海上风机暂态过程的影响,有助于准确分析其雷击暂态效应。首先建立了考虑空气湿度和高盐雾环境的空气介质模型,分析了该模型主要对桨叶和塔筒波阻抗产生影响。再综合考虑盐雾环境、雷电通道、旋转叶片姿态、主轴电容等特性对暂态过程的影响,并将多节组合空心塔体离散化处理,建立了新型一体化波阻抗模型;利用ATP-EMTP对该模型雷击暂态响应进行仿真分析,得到了盐雾及其他因素对雷电暂态过电压的影响规律。仿真结果表明,盐雾环境会对风机的暂态过电压幅值产生影响,盐雾含量增加会导致地电位升高;由于对雷电通道特性参数的考虑,过电压峰值时刻会稍滞后于雷电流最大陡度时间;而该模型对塔体的模拟能合理地描述塔体内部雷电流竖直与水平分量的折反射情况。
Due to the fact that the offshore wind farm is always operating in a humid and high salt-fog environment,research on the influence of salt-fog on the lightning striking transient process is beneficial for accurate analysis of lightning transient effects of offshore wind turbine. Firstly,the author established an air media model considering humidity and high salt-fog,which mainly affects the wave impedance of blade and tower. Then,considering the influence of salt-fog,lightning channel,rotating blades and nacelle capacitance on the transient process,and dispersing the hollow multi-section tower,a new integrated wave impedance model is established. Finally,the influence of offshore salt-fog and other factors on lightning transient overvoltage and the mechanism of this are analyzed by ATP-EMTP. The simulation results demonstrated that increased salt-fog would results in higher ground potential,and the time of the peak voltage would be slightly lag behind the lightning current maximum steepness time because of the characteristics of lightning channel,and the model of the tower part can reasonably describe the catadioptric of the lightning current vertical and horizontal components inside.
作者
马爱清
徐捷立
MA Aiqing;XU Jieli(College of Electric Power,Shanghai University of Electric Power,Shanghai 200090,China)
出处
《电瓷避雷器》
CAS
北大核心
2021年第1期145-152,共8页
Insulators and Surge Arresters
关键词
海上风电机组
盐雾环境
雷击暂态过程
波阻抗
暂态过电压
offshore wind turbine
salt-fog
lightning striking transient process
wave impedance
transient overvoltage
