高压直流电缆附件界面电荷输运模型与调控方法研究进展（英文）

Theoretical Model and Suppressing Method of Interface Charge Accumulation in HVDC Cable Accessory: A Review

高压直流电缆伴随着柔性直流输电技术的发展而得到广泛应用,其中电缆附件是高压直流电缆系统中绝缘最薄弱的环节,不同介质界面处空间电荷积累会引起电场畸变,容易导致电缆附件发生放电和击穿。综述了高压直流电缆附件界面电荷研究的进展,分析了界面电荷现有理论模型和抑制方法,并对未来直流电缆附件界面电荷的研究趋势进行展望。认为空间电荷在不同材料界面处的积累与温度、外加电场和极性反转等工作条件密切相关;同时,介绍了麦克斯韦瓦格纳斯塞拉斯理论、双极电荷输运模型以及量子化学计算在界面电荷计算和分析的应用,分析比较了基于几何设计、表面改性、场梯度材料和材料匹配的界面电荷抑制方法。相关研究结果可为更高电压等级直流电缆附件设计等提供参考。

HVDC cable has been widely used with the development of flexible HVDC transmission.Cable accessories are the weakest part of HVDC cables,while the most serious problem of DC cable joint is the uneven distribution of electric field caused by space charge accumulation,which may lead to the ageing and failure of joint insulation,especially at the interface between different materials.In this paper,the progress of the interface charge research of the HVDC cable accessories is discussed,the existing theoretical model and the suppression method of the interface charge are analysed,and the research trend of the interface charge of the accessories in the future is prospected.The results show that space charges accumulate at the interface between different material are closely related to temperature,applied electric field and working conditions such as polarity reversal,etc.;the Maxwell-Wagners-Sillars theory and bipolar charge transport model are discussed in detail,and the method of using quantum chemical theory to calculate and analyse interface charges is introduced;the methods of interface charge suppression based on geometry design,surface modification,field grading materials and material selection are analysed and compared.The summary and conclusion of these research results can provide reference for the future research on the interface charge behaviours and suppression methods of HVDC cable accessories.