Robust Dispatch of IEHS Considering Interaction Mechanism Between Multiple DHNs and EPS

District heating network (DHN) can provide flexibility for electrical power system (EPS) by utilizing heat storage capacity. First, the long-term balance between heat supply and demand must be considered. Thus, this paper defines two operating periods of DHN, including flexibility providing period (FPP) and flexibility recovery period (FRP). A DHN flexibility-providing model is designed. On the basis of proposed flexibility-providing model, a flexibility interaction mechanism between multiple DHNs and EPS is proposed. Considered the interaction mechanism, an integrated electricity and heating system (IEHS) robust dispatch model is proposed, which takes into account the flexibility supply capacity and operating costs of the system. Finally, the effectiveness of the proposed model is verified by case studies.