The development of information and communication technology makes the scheduling and control of power grid more and more dependent on the auxiliary support of the communication network, which promotes the research of power information physical fusion system. In this paper, based on the complex network and dependent network, we constructed a wide-area metering topology model in dynamic power network by combining the dependent network model with the coupling method of “degree - median” with the relationship of “partial dependence”. Then the distributed power flow of dynamic power network is calculated based on the power physics network, and the cascading fault propagation model of dynamic power network is established. Using LPRP as the vulnerability index, the identification of vulnerabilities in a dynamic power network is carried out from two perspectives: the information layer and the physical layer. The average path length gap between DPG model and real power grid is between 0.95% and 13.78%, and the percentage of line loss of different lines under the influence of distributed tides are controlled within 4.5%, and the reactive power loss of the output data of some lines is 0. After calculating the optimal tidal current, the optimal trend load shedding and islanding load shedding percentages of IEEE24 nodes in the dynamic power network were obtained as 0.157 and 0.372, respectively. Considering distributed power trending calculation in dynamic power network helps to obtain the faulty nodes in dynamic power network and fully ensure the stable operation of dynamic power network.