Research on multi‐time scale modeling and interaction of electro‐thermal coupling integrated energy system

With the enhancement of the coupling degree and interaction of the electro‐thermal integrated energy system, the fault propagation characteristics under multi‐time scale characteristics become more complex, which may trigger cascading failures and affect the safe operation of the system. Therefore, this article proposes to construct a multi‐time scale comprehensive model based on the steady‐state model and quasi‐dynamic model of electro‐thermal coupling integrated energy system, and uses the strategy of global iteration combined with local simultaneous solution to calculate the energy flow distribution of electro‐thermal coupling system under multi‐time scale. Combined with the characteristics of multi‐time scale energy flow distribution, the interaction mechanism and the fault propagation process of electro‐thermal coupling are analyzed. The simple electro‐thermal coupling integrated energy system and Barry Island electro‐thermal coupling integrated energy system are used as examples to analyze the electro‐thermal coupling characteristics and interaction of the system. The calculation results show that the disturbance of both electrical and heat loads will have a certain impact on the power system and heating system. Due to the thermal inertia of the heating system, there is a large time delay of fault propagation in the heating system. In the process of operation and scheduling of the electro‐thermal coupling integrated energy system, the slow dynamic characteristics of the heating system and the positive effect of thermal inertia on resisting the uncertainty factors in the system should be fully considered. The study of electro‐thermal coupling mechanism and interaction is of great significance for energy internet planning and operation. Therefore, the influence of thermal system hysteresis on power system operation and dispatching should be considered when planning and operating the electric‐thermal coupled energy network.