±1100kV特高压直流换流阀绝缘型式试验下的电场仿真及优化  

Electric Field Simulation and Optimization of ±1100 kV HVDC Converter Valve in Insulation Type Test

作　　者：齐磊[1] 王星星[1] 李超[1] 王高勇 崔翔[3] 高冲 

机构地区：[1]华北电力大学高电压与电磁兼容北京市重点实验室,北京102206 [2]国网智能电网研究院,北京102200 [3]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《高电压技术》2015年第4期1262-1271,共10页High Voltage Engineering

基　　金：国家自然科学基金(51277065);国家高技术研究发展计划(863计划)(2012AA052701)~~

摘　　要：为提高特高压直流换流阀塔绝缘可靠性、实现小安全裕度下换流阀绝缘的优化设计,以±1 100 k V直流换流阀作为研究对象,采用Solid Works及ANSYS混合建模技术,建立了换流阀塔的3维模型。对该模型进行单阀绝缘型式试验及多重阀直流耐压试验,得到其电场分布;并针对电场薄弱环节进行局部结构优化。研究结果表明:当选取2 700 k V/m作为换流阀厅内金具表面工作控制电场强度时,单阀绝缘型式试验中的屏蔽罩及横梁均存在电场薄弱环节,有可能产生电晕及放电现象;而多重阀直流耐压试验中不存在电场薄弱环节,不会产生电晕及放电现象。此外,增加横梁拐角、屏蔽罩侧边的倒角值以及在层间绝缘金具处添加均压环可以使得薄弱处电场强度低于控制值。In order to improve the insulation reliability of high-voltage direct-current（HVDC） converter valve towers and achieve the insulation＇s optimized design with a small safety margin, we established a 3-D model of ±1 100 kV DC converter valve using the Solid Works and ANSYS. We calculated the electric field distribution of this model in single valve insulation type tests and multiple valve DC withstand voltage tests.Using the results, we modified some electric field weak links of the model structure. The results show that when the control electric field on fitting surface in converter valve hall is 2 700 kV/m, there are weak links in both shields and beams in singe valve insulation type tests that may produce corona and discharge phenomena, whereas neither electric field weak link nor corona or discharge are found in multiple valve DC withstand voltage tests. In addition, increasing the chamfer sizes of beam corners and shields and adding grading rings to interlayer insulator fitting are proved to be effective in reducing electric field intensity at the weak links to less than the control value.

关 键 词：特高压直流输电 直流换流阀 绝缘型式试验 电场计算 屏蔽罩 均压环 绝缘优化设计 

分 类 号：TM721.1[电气工程—电力系统及自动化]