基于高效目标的多能互补能源站运行策略研究
Research on operation strategy of multi-energy complementary energy station based on efficient target
摘要：
以北京市海淀区某大型会议中心为例,采用DeST建立建筑能耗模型,进行了全年逐时负荷计算,依据项目所在地政策要求、资源禀赋及场地条件,确定采用地源热泵+空气源热泵的复合式系统,地源热泵制冷装机占比30.11%,制热装机占比32.21%,可再生能源制冷制热装机占比均为100%。通过对多能互补能源站中地源热泵机组、空气源热泵机组及循环水泵等设备的运行特性分析,提出了基于高效目标的机组最优能效加载+水泵变压差变流量控制策略,并与常规控制系统设定的机组顺次加载+水泵定压差变流量控制策略进行了全年运行能耗比较。结果显示:基于高效目标下的能源站控制策略供暖综合能效为3.36,较常规控制策略节能4.25%,能效提升4.44%;制冷综合能效为4.77,较常规控制策略节能11.03%,能效提升12.40%。该控制策略节能效果显著,可为类似多能互补能源站节能控制策略制定提供借鉴。
Abstract：
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.
Keywords:multi-energy complementary; efficient energy station; control strategy; optimal energy efficiency; variable pressure difference; variable flow