Liquefied natural gas (LNG) cold utilized micro cogeneration systems are the feasible and sustainable solutions for the inland regions where the large scale LNG cold utilization or the conventional pipeline systems are not economically applicable. The present study investigates the single and combined systems in three LNG importing countries by using the finite sum modeling which is firstly performed for the LNG cold utilization systems with the sustainability index assessment. To generate electricity, the microturbine is integrated with an LNG vaporizer and an LNG pump in the single system while the combined system includes a Stirling engine and a thermal energy storage tank in addition to the microturbine and LNG cold utilization components. Thermodynamic, environmental, thermoeconomic and sustainable analyses are performed to obtain their yearly performance maps that are extremely difficult to obtain with the conventional dynamic modeling. The yearly performance trends of the net power generation rate, exergetic efficiency, and the levelized product cost are found similar to each other while they have contrary yearly trends with the overall energetic efficiency and the Stirling engine performance parameters. The net generated power rate, the Stirling engine performance parameters, the levelized product cost, the emission rate and the sustainability index have significant changes which must be considered for the real applications while the other factors are able to be neglected during the dynamic analysis since their fluctuations are small. The most convenient time are found at 08:00 am in all the case countries though the corresponding months change for each case country. The combined system is found more feasible than the single system from the thermodynamic, thermoeconomic, environmental and sustainable viewpoints.

液化天然气（LNG）冷利用微型热电联产系统是内陆地区可行的和可持续的解决方案，因为内陆地区无法大规模使用LNG冷利用技术或常规管道系统。本研究使用有限总和模型对三个液化天然气进口国的单一系统和组合系统进行了研究，该模型是首先对具有可持续性指标评估的液化天然气冷利用系统进行的。为了发电，微型涡轮机在单个系统中与LNG气化器和LNG泵集成在一起，而组合系统除了包括微型涡轮机和LNG冷利用组件外，还包括斯特林发动机和热能储罐。热力学，环境，进行热经济学和可持续性分析以获得其年度性能图，而传统的动态建模则很难获得它们的年度性能图。发现净发电率，能量效率和均化产品成本的年度性能趋势彼此相似，而它们与总体能量效率和斯特林发动机性能参数却呈相反的年度趋势。净发电功率，斯特林发动机性能参数，产品平整化水平，排放率和可持续性指数都有重大变化，对于实际应用而言，必须考虑这些变化，而在动态分析过程中，其他因素则可以忽略不计，因为它们波动很小。最方便的时间位于08：尽管所有案例国家/地区的相应月份都发生变化，但在所有案例国家/地区都是凌晨00。从热力学，热经济学，环境和可持续的观点来看，组合系统比单个系统更可行。