  This paper discusses a dispersed generation system of multiple DC/DC
converters with DC power sources connected in a ring formulation. Here is
presented the analysis of the system based on the stored energy and passivity
characteristics of the system. Passivity Based Control (PBC), with its
energy-modifying and damping-injection technique, is applied to a ring coupled
converter system to stabilize itself at a desired DC voltage in the presence of
external disturbances. The numerical results reveal the effective application
of the control as a robust and flexible technique.
