To improve accuracy and efficiency in power systems dynamic modeling

the distributed online modeling approach is a good option. In this approach

the power system is divided into sub-grids

and the dynamic models of the sub-grids are built independently within the distributed modeling system. The subgrid models are subsequently merged

after which the dynamic model of the whole power system is finally constructed online. The merging of the networks plays an important role in the distributed online dynamic modeling of power systems. An efficient multi-area networks-merging model that can rapidly match the boundary power flow is proposed in this paper. The iterations of the boundary matching during network merging are eliminated due to the introduction of the merging model

and the dynamic models of the sub-grid can be directly “plugged in” with each other. The results of the calculations performed in a real power system demonstrate the accuracy of the integrated model under both steady and transient states.