含LNG冷能利用的综合能源系统低碳经济调度

Low-carbon Economic Dispatch of Integrated Energy System Containing LNG Cold Energy Utilization

为缓解冬季供暖期管道天然气供气紧张,液化天然气(liquefied natural gas,LNG)气化站已成为重要保供方式。提出一种以储碳设备为枢纽,连接碳捕集电厂、电转气(power to gas,P2G)和LNG气化站的综合能源系统联合低碳运行模式,该模式中碳捕集系统的捕集碳量一部分供给P2G生成甲烷、另一部分利用LNG气化冷能制备成液态CO_(2)和干冰,通过构建联合低碳运行协调优化机制,实现电-气综合能源系统的低碳经济运行。经改进的IEEE14节点电力网络和比利时20节点天然气网络耦合系统验证,所提电-气综合能源系统运行模式可在提高风电消纳、实现碳减排的同时保障用气需求,提升系统运行的经济性。

In order to alleviate the supply shortage of the piped natural gas source during the heating period in winter,the supply of liquefied natural gas(LNG)gasification stations has become an important way to supplement the supply of the pipeline network.This paper proposes a joint low-carbon operation mode which uses carbon storage equipment as a hub to connect carbon capture power plant,power-to-gas(P2G)and LNG gasification station.In this mode,part of CO_(2) captured by the carbon capture system is supplied to P2G to generate methane,while part of the rest is supplied to the LNG gasification station for using cold energy to produce liquid CO_(2) and dry ice.Through the construction of the joint low-carbon operation mechanism,the low-carbon economic operation of the electricity-gas integrated system is realized.The system coupled by improved IEEE 14-node power network and Belgian 20-node natural gas network verifies that the operation mode of the electricity-gas integrated energy system proposed in this paper can not only improve wind power consumption and achieve carbon emission reduction,but also ensure the demand of gas consumption and improve the economic efficiency of the system operation.