基于改進多導(dǎo)體分析法的 500kV 交流海纜接地性能研究

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中圖分類號：TM757.4 文獻標志碼：A 文章編號：1007-449X（2025）06-0022-13

Research on grounding performance of 500kV AC submarine cable based on improved multi-conductor cell analysis method

SU Ningjie1，GE Junkai2， ZHANG Jialin'， YANG Yong2， YE Haoliang2， CHEN Xiangrong' （1. College of Electrical Engineering， Zhejiang University，Hangzhou 310027， China; 2.State Grid Zhejiang Electric Power Co.，Ltd. Research Institute，Hangzhou 310O14，China）

Abstract：An improved multi-conductor cell analysis method was proposed to study the grounding performance of ultra-high voltage （UHV） submarine cable systems.First，the impedance matrix and shunt admitance matrix of the submarine cable were derived. Subsequently，the Laurent series expansion was introduced to solve the node admittance matrix of the multi-conductor segments of the submarine cable. Finally，a cascade algorithm for the node admittance matrix of the submarine cable under different grounding methods was established.The computational efficiency was significantly improved by this method compared to the traditional multi-conductor cell analysis method. A grounding performance study was carried out on a 500kV AC submarine cable system. The results indicate that introducing intermediate shorting points （ISP） can significantly reduce the sheath induced voltage. The voltage reduction decreases as the number of ISPs increases，achieving a 93.84% decrease at 3 ISPs. The sheath current increases whereas the armor current decreases at ISP. With 1 ISP，the maximum sheath current increases by （204號 4.26% and the maximum armor current decreases by 5.46% . The number of ISPs does not significantly affect the core current. A 6.34% reduction in total system power loss is achieved when the submarine cable system incorporates only one ISP. The results provide a new computational method and theoretical basis for the study of grounding performance in UHV AC submarine cable systems.

Keywords：AC submarine cable ; grounding performance ； multi-conductor cell analysis method ; node ad-mittance matrix； induced voltage； sheath current; armor current

0引言

隨著國家“雙碳”戰(zhàn)略和海洋經(jīng)濟的推進，超高壓海底電纜（以下簡稱“海纜”）在跨海輸電、海上風(fēng)電等領(lǐng)域發(fā)揮著至關(guān)重要的作用[1-2]。（剩余17290字）