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 model-ing 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 sin-gular 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 recon-struct the transient temperature field inside the cables in real-time,and the correctness is verified based on the tem-perature rise test results.Furthermore,the proposed method is employed to reconstruct the internal transient tem-perature 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 maxi-mum relative error of the conductor temperature DT reconstruction value is 1.76%,the conductor temperature pre-diction 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,re-spectively.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.
关键词
配网电缆/数字孪生/降阶模型/温度场重构
Key words
distribution cable/digital twin/reduced order model/temperature field reconstruction
维普
万方数据