Multi-physical Field Simulation and Parameter Inversion Method Based on Digital Twin Model

As an important power equipment in the power grid, the high-voltage cable faces the hot spot temperature problem caused by excessive load fluctuation, long-term operation, and other factors. The overheating of high voltage cable not only accelerates the aging of insulation, but also causes a lot of economic losses due to serious inter-turn short circuits. The heat generated in long-term operation will also cause deformation or even burning damage to the cable core. In this paper, a digital twin of high-voltage cable based on the driving model and data-driven is proposed, which simulates the dynamic operation process of time and space with the traditional modeling, and depicts the overall structure of high-voltage cable digital space. The high-voltage cable digital twin platform is established through the multi-field coupling model and the temperature prediction model to realize the real-time multi-physical field distribution of the high-voltage cable and calculate the thermal aging situation according to the hot spot temperature, thus completing the construction of the high-voltage cable digital twin. Experiments indicate that the error between the multi-physical field simulation based on the digital twin model and the test value is very small, which meets the needs of the project, has a stable prediction ability, improves the calculation accuracy and fitting degree, and proves the feasibility of the method used.