1.School of Electrical Engineering and Information, Southwest Petroleum University, Chengdu 610500, China;2.Petro China Southwest Oil & Gas Field Branch of PetroChina Company Limited, Chengdu 610051, China;3.Key Laboratory of the Ministry of Education on Smart Grids, Tianjin University, Tianjing 300072, China

The uncertainty of pressure energy of natural gas and the random fluctuation of pipeline network load limit the improvement of pressure energy utilization efficiency in the integrated energy system (IES). This paper proposes a comprehensive utilization mode and system architecture of the pressure energy power generation and refrigeration for natural gas pressure regulating stations. Firstly, in order to solve the pressure energy instability and the imbalance between supply and demand caused by the fluctuation of natural gas pipeline network flow, the pressure and load uncertainties in the IES of the pressure regulating station are studied to analyze the impact of uncertainty of pressure energy and the relationship between the IES and the integrated system of the pressure regulating station on optimal dispatching of IES. The uncertain factors and models of the IES are established. Secondly, on this basis, gas is used as the cold energy transmission medium, and considering the transmission characteristics of different energies of gas, cold, and heat, the energy balance relationship of the system in different time scales are analyzed, and the economic and low-carbon properties are taken into account to establish the optimal dispatching model of the IES containing natural gas pressure regulating stations. The model is solved by the mixed integer nonlinear programming method. Finally, the feasibility and effectiveness of the proposed optimal dispatching model are verified through the IES of an actual pressure regulating station.