摘要
针对柔性直流换流站阀厅紧凑化布置,导致典型金具表面易产生电场畸变、引发电晕放电危害系统可靠运行的问题,本文建立了实际布置下特高压柔性直流换流站高端阀厅的三维有限元仿真模型,考虑阀厅关键节点的运行电压波形,计算得到了阀厅内各金具表面的电场分布规律;在此基础上,发现悬吊绝缘子的电场分布存在严重畸变,分析了其原因和成套设计中存在的缺陷,优化了低压端屏蔽环及绝缘子结构。结果表明,阀厅内各主设备屏蔽装置电场未超过控制值,但悬吊绝缘子低压端屏蔽环表面场强最大值超出控制值30%。绝缘子沿面电场畸变程度随屏蔽环管径增加而加深;增长悬吊绝缘子长度2 m能够使绝缘子沿面和低压端屏蔽环表面场强最大值分别下降至390 V/mm和1860 V/mm,满足工程设计要求。本文研究成果可为特高压柔性直流输电工程阀厅自主化设计与成套金具研发提供参考。
In response to the compact arrangement of valve halls in flexible DC converter stations,which leads to electric field distortion on the surface of typical shielding devices and causes corona discharge hazards to the reliable operation of the system,a three-dimensional finite element simulation model of the valve hall was established according to the actual layout.Considering the operating voltage waveform,the electric field distribution on the surface of the armour clamp was calculated.On this basis,it’s found that the electric field distribution of the suspension insulator is seriously distorted.The causes and the defects in the design were analyzed,so that the structure of the shielding ring and the insulator at the low voltage end was optimized.The results show that the electric field of the armour clamp on the main equipment in the valve hall does not exceed the critical value,but the maximum field strength of the shielding ring at the low voltage end of the suspension insulator exceeds by 30%.The distortion degree of the electric field distribution on the suspension insulator surface will become more serious with the increase of the shielding ring diameter.Increasing the length of the suspension insulator by 2 m can reduce the maximum field strength on the insulator and the shielding ring surface to 390 V/mm and 1860 V/mm,respectively,which can meet the design requirements.The results of this paper can provide references for the independent design and development of armour clamp in UHV flexible direct transmission project.
作者
程建伟
吴泽华
黄克捷
曾强
何文志
CHENG Jianwei;WU Zehua;HUANG Kejie;ZENG Qiang;HE Wenzhi(State Key Laboratory of HVDC,CSG Electric Power Research Institute,Guangzhou 510663,China;Dongguan Power Supply Bureau of Guangdong Power Grid Corporation,Dongguan 523000,China)
出处
《电机与控制学报》
北大核心
2025年第12期171-181,共11页
Electric Machines and Control
基金
中国博士后科学基金(2024M753544)
南方电网公司科技项目(GDKJXM20222106)。
关键词
柔性直流
阀厅
成套金具
电场分布
优化设计
multi-terminal flexible DC
valve hall
armour clamp
electric field distribution
design optimization
