Research on Stability of Multiple Photovoltaic Virtual Synchronous Generators System

摘要

The existing researches of virtual synchronous generator (VSG) stability was applied for microgrid or one machine infinite bus system. There is few study on VSG stability in multiple machines system. The small signal model of grid-connected VSGs system is given in this paper. By solving the steady-state and the sensitivity analysis of the parameters, the effect of control variables and s parameters (line impedance ratio, line length, etc.) on the small signal model eigenvalues were studied. On the other hand, the comparison about the differences between multiple grid-connected VSGs stability and single VSG stability is conducted. The results of mathematic model show that if the control variables of different VSGs are basically identical, the damping characteristic of the multiple VSGs system can be equivalent to a one VSG system.