Energy flow analysis of electricity-heat integrated energy system with ring-shaped heat-supply network under accident conditions

To further investigate the operation mechanism of the electricity-heat integrated energy system with the ring-shaped heat-supply network under accident conditions, this paper deeply analyzes the energy flow results of the system under the accident condition by combining the solution methods of complex network and energy flow tracking. Firstly, based on establishing a refined calculation model of electricity-heat integrated energy system with the ring-shaped heat-supply network and proposing a weighted line betweenness index and a weighted node betweenness index, the accident condition analysis model of electricity-heat integrated energy system containing the ring-shaped heat-supply network is developed. Then, a calculated example containing four working cases in electricity-heat integrated energy system is simulated according to the results of system vulnerability identification and the layout of the heat pipe network. In the process, compare and analyze the operating parameters variation of the system from five aspects, namely, system energy flow distribution, energy flow tracking details, power system node voltage stability indexes, specific friction of the heat system pipe segments, and the results of vulnerability identification. The results indicate the regulation of energy reallocation and stability variation of integrated energy system with the ring-shaped heat-supply network under the accident condition, which provides theoretical support for the optimized design of the system and the response scheduling strategy to the accident.