The key to power distribution system is to ignore transient process in this sub-system and to draw the network equivalent circuit diagram, therefore its node voltage equation is algebraic equation.
配电子系统的建模关键是忽略其内部的暂态过程并作出了网络的等值电路图，因而依此建立的节点电压方程为代数方程。
A method for the calculation of equivalent porous permeability is presented by using the fracture geometry data in a network fracture system.
给出了网络状裂隙的等效连续介质渗透系数计算方法和耦合模型中实现源与汇作用的方法。
Besides, the equivalent model of the external power network of metro system is researched, and the impact and influence of the metro load to external power network is analyzed.
同时，对地铁供电网络的外围网络进行了等值简化处理，分析了地铁负荷对外围网络的冲击和影响。
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