高电压技术2026，Vol.52Issue(3)：1080-1089,10.DOI:10.13336/j.1003-6520.hve.20251044
多重雷击下±500kV直流架空线转海缆的雷电侵入波过电压防护
Lightning Intruding Overvoltage Protection for the±500 kV DC Overhead Transmission Line-submarine Cable System Under Multiple Lightning Strikes
摘要
Abstract
To ensure the safety of the DC submarine cable with relatively low insulation level under multiple lightning strikes,a transition station model of the±500 kV integrated offshore-onshore flexible DC transmission system for the Yangjiang Sanshan Island offshore wind power project is established in PSCAD/EMTDC.The overvoltage distributions of key equipment and submarine cables in the station are simulated,and the effects of multiple lightning current wave-forms and the number of return strokes on equipment overvoltage in the station are analyzed.Furthermore,the suppression effects of installing reactors on lightning overvoltage are investigated,and the station's withstand capabilities against multiple lightning strikes are compared under different arrester configuration schemes.The results indicate that higher lightning current amplitudes and shorter front time lead to higher overvoltages on equipment near the overhead transmission line,whereas longer tail time results in larger overvoltages at the submarine cable connection point.When the lightning current is limited to 30 kA,no additional protective measures are required.However,under 40 kA lightning strokes,the reverse-polarity overvoltage at the submarine cable terminal reaches 631 kV with an insufficient insulation margin.Installing a 4 mH reactor can suppress the cable terminal overvoltage to 384 kV,increasing the insulation margin to 33%.Additionally,adding arresters at both the station inlet and the overhead transmission line side of the reactor can further reduce equipment overvoltages and ensure that the electrical stress of all arresters remains within safe limits.These findings provide a coordinated transition station-transmission line lightning protection design methodology for large-scale offshore wind power projects using integrated offshore-onshore DC transmission.关键词
海上风电/直流转换站/海陆一体协同/多重雷击/雷电侵入波过电压/防护方案Key words
offshore wind power/DC transition station/offshore-onshore integration/multiple lightning strokes/light-ning intruding overvoltage/protection scheme引用本文复制引用
何少敏,韩永霞,林昊君,李端姣,孙文星,陈宇慧..多重雷击下±500kV直流架空线转海缆的雷电侵入波过电压防护[J].高电压技术,2026,52(3):1080-1089,10.基金项目
智能电网重大专项(2030)(2025ZD0807000) （2030）
广东省基础与应用基础研究基金(2024A1515010276). Project supported by Smart Grid-National Science and Technology Major Project(2025ZD0807000),Guangdong Basic and Applied Basic Research Founda-tion(2024A1515010276). （2024A1515010276）
