摘要
为研究土壤特性对风机接地装置冲击特性的影响规律,文中以矩量法为基础分析风机接地网电磁场,利用参数计算理论并以冲击接地电阻为主要研究参数,对风机多圆环接地网在不同的土壤电阻率、土壤分层、土层厚度及土壤温度等土壤特性条件下进行仿真研究.结果表明:均匀土壤条件下,当土壤电阻率增大时,风机接地网的冲击接地电阻随之增大,不过其增大的幅度逐步降低;在水平双层土壤条件下,风机接地网的冲击接地电阻受上层土壤电阻率影响较大,其工频接地电阻受下层土壤电阻率影响较大;当水平双层土壤的上层土壤厚度到达一定值后,土壤结构可近似看成均匀土壤;随着土壤温度降低,风机接地网的冲击接地电阻逐步增大,尤其土壤温度由0℃降为-5℃时,冲击接地电阻数值将产生剧烈变化.仿真结果对实际工程中针对不同土壤特性下风电场的建设有一定参考意义.
In order to study the influence of soil characteristics on the impact characteristics of wind turbine grounding devices,this paper analyzes the electromagnetic field of the wind turbine grounding network based on the moment method,and uses the parameter calculation theory and the impact ground resistance as the main research parameters.The soil resistivity,soil layering,soil layer thickness,and soil temperature were used to conduct simulation studies.The results show that:under uniform soil conditions,when the soil resistivity increases,the impact ground resistance of the fan ground network increases,but its increase gradually decreases;under the condition of horizontal double-layer soil,the impact of the fan ground network The grounding resistance is greatly affected by the resistivity of the upper layer,and its power frequency grounding resistance is greatly affected by the resistivity of the lower layer.When the thickness of the upper layer of the horizontal double-layer soil reaches a certain value,the soil structure can be approximately regarded as a uniform soil.The effect of soil on the overall impact characteristics of the fan grounding network;as the soil temperature decreases,the impact grounding resistance of the fan grounding network gradually increases,especially when the soil temperature decreases from 0℃to-5℃,the impact grounding resistance value will change drastically.The simulation results have certain reference significance for the construction of wind farms under different soil characteristics in actual engineering.
作者
张毅
鲁志伟
张文龙
关鹏宇
Zhang Yi;Lu Zhiwei;Zhang Wenlong;Guan Pengyu(Electrical Engineering College,Northeast Electric Power University,Jilin Jilin 132012)
出处
《东北电力大学学报》
2020年第4期35-40,共6页
Journal of Northeast Electric Power University
基金
国家自然科学基金(51877035)。
关键词
风机
土壤特性
接地装置
冲击接地电阻
Fan
Soil characteristics
Grounding device
Impact grounding resistance
