Abstract: The introduction of distributed power supply increases the complexity of the power grid, which causes some problems such as the stability and immunity of the power grid. In this paper, three types of distributed power plant connection strategies are proposed, and the topological characteristics, synchronization performance and disturbance rejection ability of a grid with the three types of connection strategies are compared. Mode 1 directly connects a new increasing distributed power plant with a load node (named the SC mode), Mode 2 is based on the way 1, and connects the nearby distributed power plant (named the LC mode). Mode 3 is also based on the way 1, connecting the nearby distributed plant with a certain probability (named the PC mode). Study shows that the synchronizability and anti-interference performance of a grid with the LC mode are the best among the three types of connection strategies, while the synchronization and anti-interference performance of a grid with the SC mode are the worst. The performace of the PC mode is better than that of the SC mode but is worse than that of LC mode.The study provides a theoretical reference for the future construction of smart grid system.

Key words: the distributed power plant, synchronization performance, network access mode, anti-interference performance