多层高压直流挤压电缆中LDPE和XLPE绝缘的空间电荷和电场行为分析

IF 3.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Electric Power Systems Research Pub Date : 2025-04-17 DOI:10.1016/j.epsr.2025.111714

Reza Sobhkhiz Juybari, Amir Abbas Shayegani Akmal, Kourosh Khalaj Monfared

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引用次数: 0

摘要

随着电力网络的扩展以及长距离和海底输电需求的增长，高压直流电缆正变得越来越普遍。聚合物被广泛用于绝缘，但主要的挑战是绝缘内部空间电荷的积累，这阻碍了发展。本研究提出了具有多层绝缘的高压直流电缆的二维模型。在 Comsol Multiphysics 软件中采用了改进的双极电荷转移 (BCT) 模型，以独立模拟高压直流电缆新鲜低密度聚乙烯层和 XLPE 层中的空间电荷动态和电场分布。对 BCT 模型进行了修改，将离子解离系数定义为电场和温度的函数，以优化交联副产物在 XLPE 电缆中的解离模拟。结果表明，负载电流、温度梯度和电场会影响空间电荷行为。此外，异种电荷和同种电荷的存在会改变电极附近和绝缘层中段的电场分布。这项研究的创新之处在于应用了改进的双极电荷传输模型来研究多层高压直流电缆绝缘层在现实条件下的空间电荷行为和电场变化。

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Analysis of space charge and electric field behavior in LDPE and XLPE insulation for multi-layer HVDC extruded cables

As power networks expand and the demand for long-distance and submarine power transmission grows, HVDC cables are becoming more common. Polymers are widely used for insulation, but the main challenge is the accumulation of space charge within the insulation, which hinders development. This study presents a two-dimensional model of an HVDC cable with multi-layer insulation. A refined bipolar charge transfer (BCT) model was employed in Comsol Multiphysics software to independently simulate space charge dynamics and electric field distribution in the Fresh LDPE and XLPE layers of the HVDC cable. The BCT model was modified, with the ion dissociation coefficient defined as a function of both electric field and temperature to optimize the simulation of cross-linking by-product dissociation in XLPE cables. The results reveal that the load current, the temperature gradient and the electric field affect space charge behavior. Additionally, the presence of heterocharge and homocharge alters the electric field distribution near the electrodes and within the midsection of the insulation. The research innovates by applying a modified bipolar charge transport model to study space charge behavior and electric field variations in multi-layer HVDC cable insulation under realistic conditions.

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来源期刊

Electric Power Systems Research 工程技术-工程：电子与电气

CiteScore

7.50

自引率

17.90%

发文量

963

审稿时长

3.8 months

期刊介绍： Electric Power Systems Research is an international medium for the publication of original papers concerned with the generation, transmission, distribution and utilization of electrical energy. The journal aims at presenting important results of work in this field, whether in the form of applied research, development of new procedures or components, orginal application of existing knowledge or new designapproaches. The scope of Electric Power Systems Research is broad, encompassing all aspects of electric power systems. The following list of topics is not intended to be exhaustive, but rather to indicate topics that fall within the journal purview. • Generation techniques ranging from advances in conventional electromechanical methods, through nuclear power generation, to renewable energy generation. • Transmission, spanning the broad area from UHV (ac and dc) to network operation and protection, line routing and design. • Substation work: equipment design, protection and control systems. • Distribution techniques, equipment development, and smart grids. • The utilization area from energy efficiency to distributed load levelling techniques. • Systems studies including control techniques, planning, optimization methods, stability, security assessment and insulation coordination.