A Reliability Assessment of an Integrated Energy System Based on Coupling Energy Flow and Thermal Inertia

With the wide application of integrated energy systems (IES), the degree of coupling between different types of energy sources is further strengthened, and the mechanism of fault development tends to be complicated. Therefore, in order to improve the accuracy and practicability of the reliability assessment of IESs, a sequential simulation reliability assessment method considering multi-energy flow and thermal inertia is proposed in this paper. In this method, the IES structure model is constructed with the combined cooling, heating and power (CCHP) unit as the core equipment, combining with the new energy source to realize the comprehensive energy power flow calculation considering any loss. Then, a load reduction optimization model is established, considering the importance of load and operational economy, in the system status analysis. Furthermore, the heat supply reliability index is corrected taking into account the transmission delay characteristics and terminal thermal inertia. A case study based on the 20-node and the analysis of the influence factors demonstrates the validity of the proposed method.