民房平台上方直流合成电场的畸变特性分析  

Analysis of distortion characteristics of DC total electric field above a residential platform

作　　者：万保权 樊昱彤 徐吉来 干喆渊 廖正海 许洪华 WAN Baoquan;FAN Yutong;XU Jilai;GAN Zheyuan;Liao Zhenghai;XU Honghua(State Key Laboratory of Power Grid Environmental Protection(China Electric Power Research Institute Co.,Ltd.),Wuhan 430074,China;Nanjing Power Supply Branch,State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210019,China)

机构地区：[1]电网环境保护国家重点实验室(中国电力科学研究院有限公司),湖北武汉430074 [2]国网江苏省电力有限公司南京供电分公司,江苏南京210019

出　　处：《武汉大学学报（工学版）》2023年第11期1315-1326,共12页Engineering Journal of Wuhan University

基　　金：国家电网公司总部科技项目(编号:5500-202155496A-0-5-ZN)。

摘　　要：邻近直流输电线路的民房平台是重要的环境敏感点,掌握其上方的合成电场分布特性对环境影响评价和线路优化设计至关重要。首先,提出平台畸变系数,并利用正交设计分析畸变系数与线路参数和平台参数的关联关系;然后,在实验室开展平台上表面的合成电场模拟试验,获得平台上方合成电场的分布特性,验证了结果的准确性;最后,利用多元线性回归方法获得中心点畸变系数与平台尺寸之间的拟合公式。结果表明,对于常规的超特高压输电线路,平台畸变系数近似仅与平台尺寸相关,而与输电线路参数无关;平台上方的合成场强呈现“U”形分布,仿真结果与试验结果相符合,负极性侧最大相对误差仅为7.17%;平台畸变系数中心变化慢,边沿变化快,10%的变化区域可涵盖平台上方的60%范围;中心点畸变系数与平台高度、平台长度的倒数基本呈线性关系,拟合优度达0.997。该研究成果可为邻近民房的直流输电线路优化设计和环境影响评价提供技术依据。The residential platform adjacent to direct current(DC)transmission line is an important environmental sensitive area,and it is very important to master the distribution characteristics of total electric field above it for environmental impact assessment and line optimization design.Firstly,the platform distortion coefficient was proposed,and the correlations between distortion coefficient and line parameters and platform parameters were analyzed by orthogonal design.Then,the total electric field simulation test on the surface of the platform was carried out in the laboratory.The distribution characteristics of the total electric field above the platform were obtained,and the accuracy of the results was verified.Finally,the fitting formula between the center point distortion coefficient and the platform size was obtained by multivariate linear regression method.The results show that for conventional ultra-high voltage(UHV)transmission lines,the platform distortion coefficient is only related to the platform size,but not to the transmission line parameters.The total electric field above the platform presents a U-shaped distribution,and the simulation results are in good agreement with the test results.The maximum relative error on the negative polarity side is only 7.17%.The center of the distortion coefficient changes slowly and the edge changes quickly.10% of the variation area can cover 60% of the range above the platform.The distribution of distortion coefficient of center point is basically linear with platform height and reciprocal of the length.The goodness of fit reaches 0.997.The research can provide technical basis for the optimal design of DC transmission lines adjacent to residential buildings and environmental assessment.

关 键 词：直流合成电场 模拟试验 民房平台 畸变系数 有限元法 多元线性回归 

分 类 号：TM153[电气工程—电工理论与新技术]