Integrated energy system planning at modular regional-user level based on a two-layer bus structure

An integrated energy system (IES) planning method with modular simulation and optimization models is proposed in this paper. A two-layer bus structure is adopted in the simulation model, where the external bus structure is used for power balance while the internal bus structure simulates the fast dynamics of electricity and slow dynamics of heat network in detail. In addition, an improved self-adaptive genetic algorithm (GA) is adopted in the optimization model to solve the multi-dimension and multi-time-scales optimization problem for the regional-user level IEPS. The proposed method can improve the extension flexibility of the system optimal planning model with expected accuracy. A case study is used to verify the effectiveness of the proposed planning method.