Optimal operation method of integrated energy systems considering flexible load regulation of demand side

In this paper, the flexible electrical and heating loads are introduced to participate in the dispatch of the integrated energy system. The source-load sides are comprehensively considered. A multi-energy system model composed of photovoltaic units, energy conversion devices and energy storage systems is constructed on the energy supply side. A flexible heating load model that can be translated, transferred and can reduce the flexible electrical load and couple indoor and outdoor temperature is established on the demand side. Taking the lowest daily operation cost of the system as the optimization goal, the energy use time and load size of equipment output and flexible loads on the energy supply side and demand side are optimized, respectively. This paper studies the optimal dispatch of the integrated energy system in a community in Beijing city. The results show that flexible load participating in dispatch can reduce the load fluctuation. The peak value of heating load decreases from the original 3 876.80 kW to 3 822.11 kW, with a decrease of 54.69 kW. The peak-to-valley difference of electrical load decreases from 1 488.81 kW to 1 382.69 kW, and the fluctuation rate decreases by 7.1%. The participation of both source-load sides in the optimal dispatch can improve the economic benefits of the system, and the system cost is reduced by 2.26% compared with the original.