基于改进多导体分析法的 500kV 交流海缆接地性能研究
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中图分类号：TM757.4 文献标志码：A 文章编号：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号 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
随着国家“双碳”战略和海洋经济的推进，超高压海底电缆（以下简称“海缆”）在跨海输电、海上风电等领域发挥着至关重要的作用[1-2]。（剩余17290字）