雷电冲击下风电机组接地系统暂态特性分析  

Analysis of transient characteristics of wind turbine grounding system under lightning strikes

作　　者：史柳 李立明 宣明 李建阳 SHI Liu;LI Liming;XUAN Ming;LI Jianyang(State Grid Jilin Electric Power Co.,Ltd.EHV Company,Changchun 130000,China)

机构地区：[1]国网吉林省电力有限公司超高压公司,长春130000

出　　处：《黑龙江电力》2023年第4期305-309,共5页Heilongjiang Electric Power

摘　　要：为了更深入掌握雷电冲击下风电机组接地系统的暂态特性,指导风电机组防雷接地设计应用,基于矩量法建立风电机组接地系统暂态数值模型,计算典型风机接地网在雷电冲击下的暂态响应。采用2.6/50μs标准雷电流波形进行算例分析,研究不同参数对暂态地电位升的影响,并提出降低暂态地电位升的措施。研究结果表明:雷电流波前时间越短、波形越陡,暂态地电位升越大,且土壤电阻率越高影响越明显;随着距电流注入点距离的增大,地电位升逐渐降低;增加雷电流注入点附近接地导体密度,铺设均压带能有效降低暂态地电位升;地网存在冲击有效面积,超过这一有效面积,多余部分接地体利用效率较低。In order to deeply grasp the transient characteristics of the wind turbine grounding system under a lightning shock,and guide the design and application of lightning protection grounding for wind turbines,a transient numerical model of wind turbine grounding system was established based on the moment method,and the transient response of the typical wind turbine grounding grid under lightning shock was calculated.The effect of different parameters on the transient ground potential was studied by using 2.6/50μs standard lightning current waveform,and the measures to reduce the transient ground potential were proposed.The results show that the shorter of the wavefront time and the steeper of the lightning current waveform,the higher of the transient potential turns;and with the increase of the distance from the current injection point,the ground potential rise decreases gradually;as the same time the transient ground potential rise can be effectively reduced by increasing the horizontal grounding conductor density near the lightning current injection point and laying equalizing rings.The results also show that there is an impact effective area of the ground grid,the excess part of the grounding is less efficient when exceeding this effective area.

关 键 词：矩量法 风电机组 接地系统 暂态响应 

分 类 号：TM614[电气工程—电力系统及自动化]