虚实融合的变压器内绝缘状态孪生方法  

State Twinning Method of Transformer Internal Insulation by Virtual-Real Fusion

作　　者：罗豪 成立 杨丽君[1] 赵学童[1] 张永泽 Luo Hao;Cheng Li;Yang Lijun;Zhao Xuetong;Zhang Yongze(State Key Laboratory of Power Transmission Equipment Technology Chongqing University,Chongqing 400044 China;Xi'an XD Transformer Co.Ltd,Xi'an 710077 China)

机构地区：[1]输变电装备技术全国重点实验室(重庆大学),重庆400044 [2]西安西电变压器有限责任公司,西安710077

出　　处：《电工技术学报》2024年第23期7628-7638,共11页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划资助项目(2021YFB2401700)。

摘　　要：发展数字孪生变压器对支撑高端电力装备智能化、数字化、可视化运维具有重要意义。然而,由于目前变压器缺乏相应的数字孪生能力,实现变压器的数字孪生还面临巨大挑战。为此,该文开展了虚实融合的变压器内绝缘状态孪生方法研究。首先计算了温度场和水分分布;然后建立了改进水分平移因子的聚合度分布动态推演模型;最后通过Delaunay三角网实现了任意时刻聚合度分布的可视化。结果表明,水分分布主要集中在纸板和底部固体绝缘处,第48年含水量最高值约为3.2%;聚合度分布规律与CIGRE报告基本相符,最低值位于低压绕组热点温度区域,第48年为252.15,验证了该方法的有效性和合理性。该文可实现变压器内绝缘老化状态参量分布评估,为后续全面构建变压器数字孪生体奠定了基础。The national development plan calls for the digital and intellectual transformation of power enterprises to support the construction of new power systems.Power transformer as the core equipment of the power grid,its operational reliability is related to the safety of the entire power grid,therefore,the development of digital twin transformer is of great significance to support the intelligent,digital,visualized operation and maintenance of high-end power equipment.However,there are still significant challenges for transformers due to the lack of corresponding digital twin capabilities,such as insufficient sensors,unknown parametric mechanism,and lack of post-processing techniques.For this reason,this paper carries out a research on a state twinning method for transformer internal insulation by virtual-real fusion.Firstly,the internal temperature field distribution of the transformer is the data basis for calculating the state parameter distribution.Considering the complex multi-physical field coupling effect of the transformer,the calculated losses are used as the heat source of the temperature field simulation for the multi-physical field coupling calculation,and the temperature field distribution corresponding to the real-time load change is derived based on the load rate monitored in the field.Secondly,the temperature field distribution of virtual calculation and the moisture in oil data of physical monitoring are combined to analyze the distribution law of moisture in paper at each local location inside the transformer.Based on the relationship between the total moisture content in the paper of multiple transformers in the field and the operation time,an empirical formula is established,and the oil-paper equilibrium equation and the law of moisture diffusion are utilized to determine the content and distribution.Thirdly,considering the effect of moisture distribution on the moisture translational factor,a dynamic derivation model of degree of polymerization distribution based on the joint action of time-tempe

关 键 词：虚实融合 变压器 数字孪生 状态参量 分布监测 

分 类 号：TM83[电气工程—高电压与绝缘技术]