高压直流海缆XLPE绝缘空间电荷与电场分布特性研究进展及展望  

Advances and Prospects of Space Charge and Electric Field Distribution Characterization of XLPE Insulation for HVDC Submarine Cables

作　　者：李忠磊 吴优 郑重 杜伯学 LI Zhonglei;WU You;ZHENG Zhong;DU Boxue(School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学电气自动化与信息工程学院,天津300072

出　　处：《高电压技术》2024年第7期3128-3144,共17页High Voltage Engineering

基　　金：国家自然科学基金(52077148,U1966203)。

摘　　要：高压直流海缆是大容量、低损耗、远距离跨海输电的核心装备,是实现规模化海上风电并网、电网跨海互联的关键基础。当前快速增长的海上风电发展需求,要求直流海缆具有更高运行电压、更大容量、更大长度,因此对交联聚乙烯(crosslinked polyethylene,XLPE)电缆绝缘材料提出了更高要求。文中首先综述了国内外高压直流海缆的发展历程,对比分析了XLPE绝缘与绕包绝缘的优势与不足。针对直流海缆绝缘面临的大长度连续挤出过程中的焦烧问题和工厂模塑接头绝缘界面问题,论述了XLPE绝缘焦烧产物和工厂接头绝缘界面缺陷对空间电荷与电场分布的影响规律及机理,介绍了全尺寸直流海缆空间电荷与电场分布特性的有限元仿真和数值计算方法,分析了稳、暂态工况下直流海缆XLPE绝缘空间电荷与电场分布的演变规律,阐明了直流海缆绝缘层厚度对空间电荷与电场分布的影响机理。最后,对直流海缆XLPE绝缘未来的发展进行了展望,指明了高压海缆绝缘国产化亟需解决的关键问题。High-voltage direct-current(HVDC)submarine cable is the core device for large-capacity,low-loss,long-distance cross-sea power transmission,which is the key foundation for realizing large-scale offshore wind power grid connection and interconnection of power grids across the sea.Currently,the rapidly growing demands for offshore wind power development require DC submarine cables to have higher operating voltage,larger capacity,and greater length,so higher requirements are put forward for Crosslinked Polyethylene(XLPE)cable insulation materials.This pa-per firstly reviewed the domestic and international development history of HVDC submarine cables,compared the advantages and shortcomings of XLPE and wrapped insulation.Regarding the scorch problem during the large-length continuous extrusion process and the insulation interface problem of factory molded joints faced by DC submarine cable insulation,the effect and mechanism of the XLPE insulation scorch products and the factory joint insulation interface de-fects on the space charge and electric field distribution were discussed.The finite element simulation and numerical calculation methods of space charge and electric field distribution characteristics of full-size DC submarine cables were introduced,the evolution of space charge and electric field distribution of DC submarine cable XLPE insulation under steady and transient conditions was analyzed,and the mechanism of the influence of DC submarine cable insulation thickness on space charge and electric field distribution was explained.Finally,the prospects in the future development of DC submarine cable XLPE insulation are put forward,and the key problems that need to be solved for the localization of high-voltage submarine cable insulation are pointed out.

关 键 词：高压直流海缆 交联聚乙烯绝缘 空间电荷 电场分布 电力装备绝缘计算学 

分 类 号：TM247[一般工业技术—材料科学与工程]