考虑天然气季节性存储的综合能源系统年度运行方式研究

为研究电气耦合日益加深的综合能源系统中能量供给的充足性和安全性，需要对其年度运行方式进行仿真。提出一种多时间尺度的综合能源系统年度生产模拟方法，考虑天然气存储等季节性波动因素，优化电气耦合系统年度运行方式，在因清洁供暖而导致天然气消耗大幅增加的算例系统中对该方法进行验证，同时评估大规模季节性天然气存储对综合能源系统年度运行方式的影响并给出建议。在此基础上，分析冷热电联产装置逐渐增加的装机量对电气耦合系统的影响。结果表明：冷热电联产机组可以降低季节性天然气存储装置的工作强度，包括减少工作时间以及降低存储量。造成这种影响的主要原因是三联供机组的制冷模式与电制冷相比效率更高，减少了天然气消耗量。

Annual Operation Mode Study of Integrated Energy System Considering Seasonal Natural Gas Storage

For the evaluation of the adequacy and security of energy supply in the integrated energy system with increasing electricity and gas coupling, it is necessary to simulate its annual operation mode. A multiple time scale simulation method for annual energy production of the integrated energy system is proposed to optimize the annual operation mode of the electricity and gas coupling system. Seasonal fluctuation factors such as natural gas storage are also considered in this method. The proposed method is validated in a designed system with increasing consumption of natural gas due to clean energy heating, and the impact of large-scale seasonal natural gas storage on the annual operation mode of the integrated energy system is analyzed. Furthermore, the influence of the increasing installed capacity of the combined cooling, heating, and power (CCHP, also known as tri-generation) unit on the coupling system is presented. The results indicate that the CCHP unit can reduce the working intensity of the seasonal natural gas storage unit, namely, the reduction of operation time and storage capacity. The main reason for this effect is that the refrigeration mode of CCHP is more efficient than that of electric refrigeration, which curtails the consumption of natural gas.