Optimal dispatch strategy for electricity-heat integrated energy system considering multiple flexibility-enhancing methods

Abstract

With the clean transformation of the global energy structure, the exploitation of renewable energy is increasing. However, the adjustable degree of the integrated energy system and the flexibility of the load are still not fully released, leading to a low consumption level of renewable energy. To enhance the operational flexibility of integrated energy system, this paper establishes a flexibility assessment framework. On this basis, a flexible optimal dispatch strategy considering multiple flexibility-enhancing methods for integrated energy system is proposed. Firstly, oriented by the source-load matching degree of the system, a flexibility assessment framework is established by taking the adjustable region and response speed as indexes. Secondly, the hydrogen system and integrated demand response strategy are introduced into the source and load sides of the system as the flexibility-enhancing methods. Thirdly, to release the flexibility of the dynamic differences of the electricity and heat system, a two-stage hybrid timescale optimal model is established with the goals of minimizing the user cost and minimizing the system operation cost, wind curtailment cost heat load loss cost at each stage. In the simulation results, the flexibility-enhancing methods proposed in this paper improve two flexibility indexes by 17.71% and 14.58%, and the operating cost and wind curtailment cost are reduced by 8.00% and 94.20% respectively.