Flexibility Mining and Improvement for Urban Electricity-Gas-Heat-Storage Integrated Energy Systems: A Review

In recent years, the proportion of renewable energy connected to the grid has been steadily increasing. However, the randomness and volatility characteristics of renewable energy pose challenges to the flexibility of the energy system. Urban integrated energy systems, which combine electricity, gas, and heat, could enhance the flexibility of the energy system by coordinating energy storage with various energy systems. This paper focuses on the flexibility of urban electricity-gas-heat-storage integrated energy systems. Firstly, the paper discusses the difference between park-level integrated energy systems and urban-level integrated energy systems. Secondly, based on the existing research, the paper conducts an integrated modeling analysis of urban integrated energy systems. Finally, the paper explores the potential for flexibility in urban electricity-gas-heat-storage integrated energy systems.