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在图形建模中，建模人员在图形终端上画出热力系统流程图，系统就能自动生成出仿真模型。其中，模块参数的连接要根据流体网络拓扑结构自动实现，因此，图形建模中的一个重要问题是如何定义、识别热力系统的拓扑结构。网络结构的定义方法既要符合电厂习惯，又要保证拓扑信息容易识别。该文给出两种流体网络结构的定义方法及各自的拓扑分析方法。这些方法在为韩国三星重工开发的图形建模软件ＧＮＥＴ中得到了实现。ＧＮＥＴ已应用于“６００ＭＷ火电培训装置”的开发中
In graphic modeling, the modeler draws the thermodynamic system flow chart on the graphical terminal, and the system can automatically generate the simulation model. Among them, the connection of module parameters should be automatically realized according to the fluid network topology. Therefore, an important problem in the graphic modeling is how to define and identify the topological structure of the thermal system. The definition of network structure should not only accord with the habit of power plant, but also ensure that the topology information is easy to identify. This paper gives two definition methods of fluid network structure and their respective topological analysis methods. These methods have been implemented in GNET, a graphics modeling software developed by Samsung Heavy Industries. GNET has been used in the development of “600MW thermal power training device”