  Appropriate control of high penetration renewable energies in power systems
requires a complete modeling of the system. In this paper, a comprehensive
state space modeling of voltage source inverters, networks and loads are
studied. We have modeled a secondary voltage control that utilizes the nominal
set points of the output voltage as the input for the controller design. A
distributed control algorithm only requiring a sparse communication between
neighboring distributed generators (DGs) is used. The proposed secondary
voltage model is applied on a microgrid with three DGs and two loads to verify
the results.
