海岸礁石地区风电机组接地特性研究  

Research on Impact Grounding Characteristics of Wind Turbine in Coastal Rock Area

作　　者：林忠宣 唐雷 丁杨 LIN Zhongxuan;TANG Lei;DING Yang(Electrical Engineering College,Northeast Electric Power University,Jilin Jilin 132012;State Grid Beijing Yizhuang Electric Power Supply Company,Beijing 100023;Grid Liaoming Power Co.Ltd.Dalian Power Supply Company,Dalian Liaoning 116000)

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012 [2]国网北京亦庄供电公司,北京100023 [3]国网辽宁省电力有限公司大连供电公司,辽宁大连116000

出　　处：《东北电力大学学报》2023年第1期29-34,共6页Journal of Northeast Electric Power University

基　　金：国网吉林省电力有限公司辽源供电公司科技项目(SGTYHT/20-JS-224)。

摘　　要：为研究海岸地区风电机组冲击接地特性和工频接地特性,文中基于傅立叶变换与反变换理论,通过建立风电机组圆环加垂直接地极模型,与海岸地区礁石、淤泥水平双层土壤这一特殊地质结构相结合,讨论了垂直接地极根数、雷电流波头时间、礁石层厚度以及土壤电阻率大小对风电机组冲击接地电阻和工频接地电阻的影响。结果表明:垂直接地极能有效降低冲击接地电阻和工频接地电阻,但并不是越长越好,其存在一个有效长度;随着雷电流波头时间的增加,冲击接地电阻不断减小;礁石层厚度对冲击接地电阻影响较大,若厚度太大会使工频接地电阻满足工程要求而冲击接地电阻并不满足要求;礁石层土壤电阻率对冲击接地电阻影响较大,对工频接地电阻影响较小,淤泥层土壤电阻率对工频接地电阻影响较大,对冲击接地电阻影响较小。In order to study the impact grounding characteristics and power frequency grounding characteristics of wind turbines in coastal areas,based on Fourier transform and inverse transform theory,this paper established a ring plus vertical grounding pole model of wind turbines,combined with the special geological structure of rock and silt horizontal double-layer soil in coastal areas.The effects of vertical grounding pole length,lightning current head time,rock layer thickness and soil resistivity on impact grounding resistance and power frequency grounding resistance of wind turbine are discussed.The results show that the vertical grounding electrode can effectively reduce the impact grounding resistance and power frequency grounding resistance,but the longer the better,there is an effective length;The impact grounding resistance decreases with the increase of lightning current wave head time.The thickness of rock layer has a great influence on the impact grounding resistance.If the thickness is too large,the power frequency grounding resistance meets the engineering requirements,but the impact grounding resistance does not meet the requirements.The soil resistivity of rock layer has a great effect on the impact grounding resistance,but a little effect on the power frequency grounding resistance.The soil resistivity of silt layer has a great effect on the power frequency grounding resistance,but a little effect on the impact grounding resistance.

关 键 词：风电机组 接地电阻 垂直接地极 水平双层土壤 

分 类 号：TM863[电气工程—高电压与绝缘技术]