基于电-热-流多场耦合仿真的海底电缆载流量分析

Ampacity Analysis of Submarine Cable Based on Electric-Thermal-Flow Multiphysics Coupling Simulation

海底电缆在各路段敷设方式下的温度场和载流量受多种因素的影响,其准确计算对提升海上风电场电能输送的可靠性和经济性具有重要意义。利用COMSOL仿真平台搭建交流三芯和直流单芯海底电缆在土壤直埋、海底直埋、海底平铺和管道敷设等情况下的“电-热-流”多物理场耦合模型,运用有限元法和牛顿迭代法计算海底电缆的温度场分布和载流量大小,并探讨埋设深度、海水流速、海水温度和保护管材料等因素对海底电缆载流量的影响。仿真结果表明:埋设深度、海水流速、海水温度等主要通过影响散热能力来影响载流量大小,合理选择敷设方案有利于提高海缆载流量和工程建设经济性。

The temperature field and ampacity of submarine cables in different sections are affected by many factors,and its accurate calculation is of great significance to improve the reliability and economy of power transmission of offshore wind farms.In this paper,COMSOL software is used to establish the electric-thermal-flow multiphysics coupling model of AC and DC submarine cable under the conditions of soil direct burial,seabed direct burial,submarine laying and pipe laying.Finite element method and Newton iteration method are used to calculate the temperature field distribution and ampacity of submarine cables,and the influence of the buried depth,sea water velocity,seawater temperature and pipe material under different laying modes are discussed.The results show that the buried depth,seawater velocity,seawater temperature and tube material affect the ampacity mainly by affecting the heat dissipation capacity,and the reasonable selection of laying scheme is conducive to improve the current carrying capacity of submarine cable and the economic efficiency of engineering construction.