Regional Integrated Energy System N-1 Energy Flow Calculation Method Based on Unified Energy Path Theory

With the development of regional integrated energy systems, it has become increasingly important to unify the modeling and analysis of multi-energy networks. This paper models the power, natural gas, and heating networks based on the unified energy path theory and uses the Newton-Raphson method to iteratively calculate the energy flow distribution of the system accurately. Furthermore, to assess the impact of the system under fault conditions, this paper introduces the $\mathrm{N}-1$ accident set analysis method, which evaluates and analyzes the changes in energy flow after the interruption of network branches. The results show that this method can effectively analyze the impact of the branch $\mathrm{N}-1$ on the energy flow distribution of the network, providing a reliable quantitative basis for the safe operation of the system.