中文摘要：

传统的能源系统分析规划研究局限于电、气、热（冷）等单一能源形式系统的内部。多能源系统的统筹协调有利于促进可再生能源吸纳,提高能源利用效率。文中首先介绍了多能源系统的结构,分析了电、气、热（冷）等子系统的特征,探讨了协同效益,进而阐述了能源流分析计算方法。基于此,对多能源系统的优化运行与优化规划问题进行了分析、讨论。最后,总结了多能源系统分析与规划的关键问题,以期为相关研究提供参考。

英文摘要：

The energy systems such as the electric power system, natural gas network and heat （cool） system are conventionally analyzed and planned independently. The introduction of the multi-energy system helps exploit the synergy of different energy forms, promote the integration of renewable energy and improve the energy efficiency. Firstly, the structure of the energy system was introduced, as well as the features of different subsystems. Secondly, the energy flow equations and analysis methods were presented. Based on them, the optimal operation and planning of energy systems were discussed respectively. Finally, the key problems for the multi-energy system analysis and planning were summarized, to throw some light on the related research.