Abstract: With increasing demand of electric power, more and more distributed generations will be integrated into the power grid. In order to study the influences of two different connected strategies on the dynamic characteristics of power grid, this paper uses a second-order Kuramoto model as a node model of the power grid to compare the synchronous ability and transient stability of two kinds connected strategies in IEEE30 bus, IEEE57 bus, and IEEE162 bus system. The first strategy is that the distributed generations are connected to the load nodes with smaller degree (SDJ), while the second is an opposite strategy, the distributed generations are connected to the load nodes with larger degree (LDJ). The study shows that both of the two kinds of strategies can reduce the threshold of synchronization and the SDJ strategy can improve the synchronous ability better than the LDJ strategy. Moreover, with more distributed generations, the network which connected with SDJ strategy will be more robust against the perturbations and can recover to steady states quickly. The study provides a reference for the design of the distributed power grid.

Key words: distributed generations, power grid, SDJ, LDJ