  Continuously Variable Series Reactor (CVSR) has the ability to regulate the
reactance of an ac circuit using the magnetizing characteristics of its
ferromagnetic core, shared by an ac and a dc winding to control power flow,
damp oscillations and limit fault currents. In order to understand and utilize
a CVSR in the power grid, it is essential to know all of its operational
characteristics. The gyrator-capacitor approach has been applied to model
electromagnetic coupling between the two circuits, controlled ac circuit and
control dc circuit of the device. In this paper, we investigate some of the
CVSR side behavior in terms of the induced voltage across the dc winding, flux
density within the core's branches, and the power exchange between the two
circuits during normal operation and fault conditions.
