220 kV交联海缆的低频载流能力及温度场分布仿真研究  

Simulation on current capacity and temperature field distribution in 220 kV XLPE submarine cable under low frequency

作　　者：吴冰洁 丁苒苒 陈晨 王耀港 王哲铭 卢武 WU Bingjie;DING Ranran;CHEN Chen;WANG Yaogang;WANG Zheming;LU Wu(School of Electric Engineering,Shanghai University of Electric Power,Shanghai 200090,China;Training Center of State Grid Shanghai Municipal Electric Power Company,Shanghai 200438,China;State Grid Shanghai Urban Electric Power Supply Company,Shanghai 200080,China;State Grid Xiong'an New Area Electric Power Supply Company,Xiong′an 071600,China)

机构地区：[1]上海电力大学电气工程学院,上海200090 [2]国网上海市电力公司培训中心,上海200438 [3]国网上海市电力公司市区供电公司,上海200080 [4]国网雄安新区供电公司,河北雄安071600

出　　处：《绝缘材料》2023年第12期34-42,共9页Insulating Materials

基　　金：国家自然科学基金资助项目(51707113);上海市“晨光计划”项目(21CGA63)。

摘　　要：柔性低频输电系统在提升输电容量、减小线路充电无功、改善输电通道末端电压质量等方面具有优越性,可以有效满足中、远距离海上风电高效汇集送出等迫切需求。为研究海底电缆在低频条件下的运行特性,本文搭建了考虑外界敷设环境影响下的220 kV交联聚乙烯电-磁-热-流多物理场耦合有限元仿真模型,分析了不同敷设段中50 Hz和20 Hz频率下运行的海底电缆稳态载流量和温度场分布情况,并基于IEC 60287:1995建立的海底电缆稳态热路模型和低频海缆发热仿真的典型案例,对有限元仿真进行验证。结果表明:在陆地段、入海段和海底段等不同敷设环境下,仿真模型的载流量和温度场分布计算结果与IEC解析公式的相对误差都在3%以内,表明本文提出的220 kV交联电缆温度场仿真模型具有较好的准确性和有效性;频率降低可以减小线芯交流电阻值、改善电缆导体中的电流分布、减小电缆各部分的运行损耗,从而降低电缆的整体运行温度,有利提升电缆的传输容量。The flexible low-frequency transmission system is superior in enhancing transmission capacity,reducing line charging reactive power,and improving voltage quality at the end of transmission channels,which can effectively meet the urgent demand for efficient aggregation and transmission of medium-and long-distance offshore wind power.In order to study the operating characteristics of submarine cables under low frequency condition,an electric-magnetic-thermal-flow coupled finite element simulation model of 220 kV cross-linked polyethylene was built considering the influence of external laying environment,and the steady-state ampacity and temperature field distribution of submarine cables operating at 50 Hz and 20 Hz in different laying sections were analyzed.The finite element simulation was verified by building a steady-state thermal path model of submarine cable on the basis of IEC 60287:1995 and previous simulation results of thermal field distributions in submarine cable under low frequency.The results show that under different laying environments of land section,sea section,and submarine section,the relative errors between the ampacity and temperature field distribution calculation results of simulation model and the analytical equation of IEC are within 3%,indicating that the temperature field simulation model of 220 kV cross-linked cable proposed in this paper has good accuracy and high efficiency.Meanwhile,it is found that the frequency reduction can reduce the AC resistance of cable conductor,improve the current distribution in the cable conductor,and reduce the operating loss of each part of cable,thereby the overall operating temperature of cable is reduced eventually and the cable transmission capacity is improved favorably.

关 键 词：海底电缆 低频输电 有限元仿真 载流量 温度场 

分 类 号：TM247[一般工业技术—材料科学与工程]