Preventive control of regional integrated energy system based on interval time-varying security region considering reserve capacity of electric vehicle

With the substitution of electric vehicles (EVs) for traditional fuel vehicles, the penetration rate of EVs in urban energy systems has progressively increased. Simultaneously, the multi-energy coupled regional integrated energy system (RIES) comprising energy hub (EH) and energy distribution network is also rapidly evolving in urban districts with the benefits of clean and high energy efficiency, which also constitute more challenges to system security analysis. As a unique energy storage system, EV battery can provide reserve capacity for RIES to improve the N-1 security of the system. Therefore, the EV trip simulation and reserve capacity model are established to gain the spatiotemporal distribution of positive and negative reserve capacity, in which interval-affine arithmetic is used to explain the uncertainty. Then, the model of the RIES security region considering EV access is established to evaluate the N-1 security to acquire comprehensive security information. As an application of the security region theory, a security control strategy realized by adjusting multi-energy load and EV reserve capacity is proposed to ensure that the operating point is secure. Finally, a case study based on a demonstration project in East China was conducted to verify effectiveness of the proposed method, and the result indicated that 21.7% load curtailment and 34.7% maximum possible renewable energy source (RES) abandon can be decreased on average during the load peak period in the typical days of different seasons.