Abstract:With the continuous advancement of the construction of the power system with renewable energy as the main body and the distributed smart grid, the problem of the large-scale integration and consumption of renewable energy generations with random characteristics has become increasingly prominent under the strategic goals of “double carbon”. A day-ahead economic dispatch model for the building integrated energy system (BIES) was proposed in this paper. With its characteristics of multiple load requirements and flexible regulation, this model aimed to maximize the local consumption of the renewable energy on the basis of meeting the energy demand and grid interaction. First of all, according to the characteristics of the building energy consumption, the “determining power generation by heat” operation mode of the combined heat and power (CHP) system was decoupled by configuring the ground source heat pump and other electrical heating equipment with high energy efficiency ratio. The hybrid energy storage system with battery and heat storage tank was also introduced to further enhance the system adjustment ability. Then, considering the constraints such as the supply and demand balance, the equipment output, the energy storage operation, and the tie-line power exchange, the minimum total operating cost was taken as the objective function including the unit start-up, the unit shutdown, the loss of wind and photovoltaic power generations. The day-ahead economic dispatch optimization model of the system was further established, and CPLEX was used to solve this mixed integer linear programming problem. Finally, the system operation cost, the energy utilization rate and the renewable energy consumption capacity were taken as the evaluation indicators for simulations under different scenarios. The simulation results show that, compared with the traditional “heat and power distribution” mode, the BIES with the ground source heat pump and the hybrid energy storage system can reduce the operation cost by about 50%, and improve the energy utilization rate by about 50%. It can also completely consume the renewable energy generations. With the increase of the energy efficiency ratio of the energy conversion equipment, its operation cost can be further reduced, which has good operability and socio-economic benefits.