三芯高压直流海缆结构设计及性能研究

Structural Design and Performance Study of Three-core HVDC Submarine Cable

基于三芯交流海缆及单芯直流海缆的结构特点,对三芯高压直流海缆进行结构设计,采用有限元法对单芯直流海缆和三芯直流海缆进行机械性能和电气性能仿真。结果表明,三芯直流海缆敷设深度是单芯直流海缆的78%;在特定工况下,三芯直流海缆正常运行时载流量为单芯直流海缆的83%,在极性缆一级故障情况下另一根极性缆可与回流缆配合进行电能传输,输送容量可达到单芯海缆正常运行时的73%;三芯直流海缆占用路由宽度是单芯直流海缆的50%,敷设次数仅为单芯直流海缆的33%。综合考虑三芯直流海缆可降低敷设成本,提升海洋资源利用,是未来发展趋势。

Based on the structural characteristics of three-core AC submarine cable and single-core DC submarine cable,the structure design of three-core HVDC submarine cable was carried out in this paper.The mechanical and electrical performance simulation of single-core DC submarine cable and three-core DC submarine cable were carried out by using finite element method.The results showed that the laying depth of the three-core DC submarine cable was 78%of that of the single-core DC submarine cable.Under specific working conditions,the current carrying capacity of three-core DC submarine cable was 83%of that of single-core DC submarine cable during normal operation.In the case of primary failure of the polar cable,the other polar cable can cooperate with the return cable for power transmission,and the transmission capacity can reach 73%of the normal operation of the single-core submarine cable.The routing width occupied by the three-core DC submarine cable was 50%of that of the single-core DC submarine cable,and the laying times were only 33%of that of the single-core DC submarine cable.The comprehensive consideration of three-core DC submarine cable can reduce the laying cost and improve the utilization of marine resources,which is the future development trend.