区域综合能源系统的能效定义及其相关性分析

首先,考虑多种能源的能级水平,将区域综合能源系统分为能源供应、能源转换、能源传输、能源存储和能源需求5个环节,提出了适用于评价区域综合能源系统能效的能源利用效率表达式。然后,通过对能源利用效率相关因素的理论分析,指出5个环节中可再生能源渗透率、能源转化设备效率和容量配置结构、冷/热/电负荷需求结构是影响综合能源系统能源利用效率的核心要素。最后,依托中国某地示范园区展开实例分析,算例结果表明能效表达式能够准确反映区域综合能源系统多能互补耦合和梯级利用的特色,并通过分析区域综合能源系统能效展示了合理配置能源转化设备和优化冷/热/电负荷需求结构的重要性和方法,与理论分析结果一致,说明了所提区域综合能源系统能源利用效率表达式的有效性。

Definition and Correlation Analysis on Energy Utilization Efficiency of Regional Integrated Energy System

Firstly, considering the different energy levels of multiple energies, the regional integrated energy system (RIES) is divided into five links: energy supply, energy conversion, energy transmission, energy storage and energy demand. Also, an expression of energy utilization efficiency (EUE) for evaluating RIES is proposed. Secondly, through the theoretical analysis on related factors of EUE, it points that penetration of renewable energy, efficiency of energy conversion equipment and capacity allocation structure, demand structure of cool/ heat/ electricity load in five parts of RIES are the core elements, which affect the EUE of RIES. Finally, a case study of a certain demonstration district in China is given to show that the energy efficiency expression can accurately reflect the characteristics of multi-energy complementary coupling and cascade utilization of RIES. By analyzing the EUE of RIES, the importance and method of reasonably allocating energy conversion equipments and optimizing the demand structure of cool/heat/electricity load are demonstrated, which is consistent with the theoretical analysis. The validity of the proposed EUE of RIES is illustrated.