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.
distribution cabledigital twinreduced order modeltemperature field reconstruction
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