特高压直流输电系统阀厅金具表面电场精细求解  

Accurate Calculation Method of Electric Field on the Surface of Converter Valve Fittings in UHVDC System

作　　者：金硕[1] 甘艳[2] 阮江军[1] 杜志叶[1] 朱琳[3] 常林晶 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]华中电网有限公司,武汉430077 [3]国网湖北省电力公司技术培训中心,武汉430079 [4]平高集团有限公司,平顶山467000

出　　处：《高电压技术》2015年第4期1299-1305,共7页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2011CB209404)~~

摘　　要：特高压直流输电系统阀厅内部结构复杂,采用有限元(FEM)法模拟计算其内部电场时剖分困难。为此,结合某±800 k V特高压换流站阀厅的3维全模型,基于模块化与独立化的思想,提出了实体模型区域化网格剖分方法。该方法克服了复杂模型下网格剖分困难、对计算机硬件要求高的问题,剖分后可获得质量较高的网格。针对模型单元数较多的情况,选用不完全Cholesky分解预处理共轭梯度法(ICCG)求解复杂模型的有限元方程组。最后结合区域网格剖分与子模型技术,实现了阀厅内局部区域电场强度的准确计算。结果表明:将求解域尺寸设置为内部模型尺寸的1.3倍以上时,所得到的切割边界符合子模型计算要求,此时边界上的最大计算误差≤2%,子模型电场计算精度满足要求。Complex internal structures of valve halls in ultra-high voltage direct current systems make them difficult to mesh in calculations using the finite element method（FEM）. To solve this problem, we built a 3-D model of ±800 kV ultra-high voltage converter station valve hall, and proposed a regionalization mesh generation method following the principle of modularity and independence. The method overcomes the difficulty in mesh generation for complex models, lowers the demands of computer hardware, and can obtain meshes with high quality. Since the complex model has huge number of elements, we choose the incomplete Cholesky conjugate gradient（ICCG） algorithm to solve the model＇s FEM equations. Eventually, combining the regionalization mesh generation method with the sub-model technology, we have realized the accurate electric field calculation of certain local parts in valve hall. The calculation results show that setting the size of solution region as large as 1.3 times the devices in sub-models, the obtained cut boundaries can meet the demands of sub-model calculation. The maximum error on the boundary is less than 2%, and the calculated sub-model electric field is accurate.

关 键 词：特高压 阀厅 金具 电场计算 有限元法 网格剖分 

分 类 号：TM721.1[电气工程—电力系统及自动化]