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现有的电力系统能量流分析已经形成一套完整的建模与定量分析方法体系，其中并未明确计及通信、保护和控制的信息流特性。目前面向电力系统应用的信息流建模和计算方法的研究几乎还是空白，严重阻碍了电力信息物理融合系统中能量流与信息流耦合分析的研究进程。文中以信息流动的视角，结合图论、矩阵分析和网络演算理论，借鉴电力系统潮流计算方法，系统提出信息流的建模思路和静态计算方法。进一步将所提出方法应用于智能变电站保护信息流的定量分析，计算结果与网络分析仪的实验测试结果非常吻合，表明所提出信息流计算方法的正确性。“,”The existing energy flow analysis of power system has been formed a complete framework of modeling and quantitative analysis, which does not explicitly account for information characteristics of communication, protection and control. There are almost no remarkable achievements for analyzing the coupling and associated behaviors of energy flow and information flow in a cyber physical power system (CPPS), for lacking the information model suited for power system application. The modeling idea and computing methods of fluid information were developed, in which the graph, matrix and network calculus theory were composited and power flow calculation of the electric system were used for reference. As an example, the upper bound delay and traffic distribution of protection based on a substation communication network were calculated using the proposed method. The computing results and experimental ones from a network analyzer are very consistent, which suggests the validity of the proposed information flow calculation method.