Research on operation strategy of multi-energy complementary energy station based on efficient target

This paper takes a large conference center in Haidian District of Beijing as an example,uses DeST to establish a building energy consumption model and calculate the annual hourly load.According to the policy requirements,resource endowment and site conditions of the project location,the coupling system of ground-source heat pump and air-source heat pump is determined,with the installed capacity of ground-source heat pump for cooling accounting for 30.11% and for heating accounting for 32.21%,and the proportion of installed capacity for renewable energy cooling and heating is 100%.Based on the analysis of the operation characteristics of ground-source heat pump units,air-source heat pump units and circulating water pumps in multi-energy complementary energy stations,this paper puts forward the strategy of optimal energy efficiency loading of units based on high efficiency goal and variable pressure difference and variable flow control of water pumps,and compares the annual operation effect with the strategy of sequential loading of units and constant pressure difference and variable flow of water pumps set by the conventional control system.The results show that the comprehensive heating energy efficiency of the energy station control strategy based on the efficient target is 3.36,which saves energy by 4.25% and improves energy efficiency by 4.44% compared with the conventional control strategy.The comprehensive cooling energy efficiency is 4.77,which saves energy by 11.03% and improves energy efficiency by 12.40% compared with the conventional control strategy.The energy-saving effect of the control strategy proposed in this paper is remarkable,which can provide a reference for the formulation of energy-saving control strategies for similar multi-energy complementary energy stations.