华南理工大学学报(自然科学版) ›› 2025, Vol. 53 ›› Issue (1): 10-20.doi: 10.12141/j.issn.1000-565X.240050

• 能源、动力与电气工程 • 上一篇    下一篇

基于降阶模型的配网电缆温度场数字孪生建模方法

牛海清1, 黄世杰1, 王东1, 马海涛1, 范华2, 翁利国2, 刘刚1   

  1. 1.华南理工大学 电力学院,广东 广州 510640
    2.浙江中新电力工程建设有限公司,浙江 杭州 311200
  • 收稿日期:2024-01-29 出版日期:2025-01-25 发布日期:2025-01-02
  • 作者简介:牛海清(1969—),女,博士,副教授,主要从事高压试验、电缆仿真优化等研究。E-mail: niuhq@scut.edu.cn
  • 基金资助:
    核电安全监控技术与装备国家重点实验室开放基金项目(K-A2021.425);国家电网浙江电力公司企业科技项目(HDXS3-2110037)

Digital Twin Modeling Method of Temperature Field in Distribution Cables Based on Reduced Order Model

NIU Haiqing1, HUANG Shijie1, WANG Dong1, MA Haitao1, FAN Hua2, WENG Liguo2, LIU Gang1   

  1. 1.School of Electric Power,South China University of Technology,Guangzhou 510640,Guangdong,China
    2.Zhongxin Power Engineering Construction Corporation of Zhejiang,Hangzhou 311200,Zhejiang,China
  • Received:2024-01-29 Online:2025-01-25 Published:2025-01-02
  • About author:牛海清(1969—),女,博士,副教授,主要从事高压试验、电缆仿真优化等研究。E-mail: niuhq@scut.edu.cn
  • Supported by:
    State Key Laboratory of Nuclear Power Safety Technology and Equipment Open Fund(K-A2021.425)

摘要:

电力设备的物理状态感知是建设智能电网的关键点之一。数字孪生技术可实时映射并快速预测设备的物理状态,但现有建模方法难以满足电缆温度场数字孪生模型的实时计算要求。鉴于此,该文提出了一种基于降阶模型的配网电缆温度场数字孪生建模方法。首先,建立电缆多物理场全阶模型,基于奇异值分解和响应面插值方法建立其稳态温度场降阶模型;然后,结合稳态温度场降阶模型及电缆表面温度数据,通过实时求解多回路电缆传热反问题重构当前的电缆内部瞬态温度场,并基于排管敷设电缆温升试验验证了方法的正确性。进一步地,将该方法应用于实际运行的10 kV电缆的内部瞬态温度场重构,将重构结果作为已知初始状态,基于稳态温度场降阶模型和改进叠加法快速预测应急状态下的电缆导体温度。与全阶模型相比,电缆导体温度重构值的最大相对误差为1.76%,应急状态运行的导体温度预测误差为1.01%,单次重构和预测计算时间分别为8.1 s和3.6 s,计算效率分别提高约35 555倍和6 000倍。该方法兼顾了计算速度、计算精度和建模成本,对其他类型电力设备温度场数字孪生建模具有参考意义。

关键词: 配网电缆, 数字孪生, 降阶模型, 温度场重构

Abstract:

State perception of power equipment is one of the key issues in the construction of smart grid. Digital twin (DT) technology can map and quickly predict the physical state of equipment in real-time, but existing modeling methods are difficult to meet the real-time computing requirements. This paper proposes a DT modeling method for distribution cables temperature field based on reduced-order model. The method first establishes a multi-physics full-order model of cables, builds a reduced-order model of the steady-state temperature field based on singular value decomposition and response surface interpolation methods. Combining the steady-state reduced-order model and temperature measurement data, the multi-circuit cables heat transfer inverse problem is solved to reconstruct the transient temperature field inside the cables in real-time, and the correctness is verified based on the temperature rise test results. Furthermore, the proposed method is employed to reconstruct the internal transient temperature field of 10 kV cables in actual operation. Taking the reconstructed result as the known initial state, the cable conductor temperature during emergency operation is quickly predicted based on the reduced-order model and the improved superposition method. As compared with the simulation results of the full-order model, the maximum relative error of the conductor temperature DT reconstruction value is 1.76%, the conductor temperature prediction error during emergency operation is 1.01%. The calculation time of single reconstruction and prediction is 8.1 s and 3.6 s, and the calculation efficiency is about 35 555 times and 6 000 times that of the full-order model, respectively. The new method takes calculation speed, calculation accuracy and modeling cost into consideration, and has reference significance for the temperature field DT modeling of other types of power equipment.

Key words: distribution cable, digital twin, reduced order model, temperature field reconstruction

中图分类号: