基于3D模拟电荷法的变电站工频电场计算  

Calculation of Power Fiequency Electric Field in Substation Using 3D Charge Simulation Method

作　　者：杜志叶[1] 干喆渊[2] 阮江军[1] 阮祥勇[3] 文武[1] 杜卫[1] 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]国网电力科学研究院,武汉430074 [3]安徽合肥供电公司,合肥230022

出　　处：《高电压技术》2011年第10期2587-2593,共7页High Voltage Engineering

基　　金：国家自然科学基金(50977066)~~

摘　　要：高压变电站内工频电场的计算与评测日益重要。为此,采用3D模拟电荷法(charge simulation method,CSM)对某变电站户外区域离地1.5m高度处工频电场进行了计算和分析。模拟电荷采用置于导体轴线上的线电荷模拟,电荷密度在线单元上呈线性分布。采用ANSYS前、后处理模块实现实体建模和计算云图的3D渲染;通过对一条1000kV特高压输电线路走廊内工频电场的计算,验证了3DCSM方法的正确性。对一个实际的110kV变电站的工频电场进行建模仿真,电场强度的数值分布规律同理论分析基本符合;在工作走廊上计算值同实测结果变化趋势一致,在电气设备不太密集的区域,计算值与实测值之间误差<10%。该方法可以用来求解大模型开域场问题。Calculation and assessment of power frequency electric field in the high voltage substation is very important for the substation designers. 3D charge simulation method （CSM）is applied to calculate the power frequency electric field in outdoor area of a typical substation, in which the overhead line, overhead bus, transformer, house and grounded metal pillar are modeled. In 3D CSM, some linear charge elements, which change linearly along the line element are treated as the simulating charges and placed in each conductor＇s center. Then the global potential coefficient matrix is obtained by the superposition of each element＇s contribution. The linear charge on each node is solved and the electric field on arbitrary points can be analytically calculated. Moreover, the 3D model is built and the calculation results are shown by pre-process module and post-process module of ANSYS software, and the proposed method is primarily proved by an example of 1000 kV overhead line to analyze the electric field in the plane 1. 5 m area above the ground. Based on the 3D CSM, a practical 110 kV substation is modeled to calculate and analyze power frequency electrical field. The calculation results of electrical field intensity in working corridor agree well with measurement values. The relative error between calculation and measurement values is lower than 10 percent at the area with lower concentration equipment. The proposed method can be used to solve open boundary electrical field problem with complex model.

关 键 词：3D模拟电荷法(CSM) 前处理 变电站 工作走廊 工频电场 线电荷单元 

分 类 号：TM15[电气工程—电工理论与新技术]