  Continuously Variable Series Reactor (CVSR) can adjust the total reactance in
an ac circuit using the saturation characteristic of the ferromagnetic core,
shared by an ac and a dc winding. The bias magnetic flux produced by the dc
winding can regulate the equivalent ac inductance in order to control power
flow, damp oscillations, or limit fault currents. Gyrator-Capacitor approach is
used to model the interface between the magnetic and the electric circuits. Two
different dc control source models are considered: the usual ideal dc source
and a realistic dc source composed of a power electronics-based converter and
an ac voltage source. This paper investigates CVSR's behaviour in terms of
induced voltage across ac winding, flux densities (B) throughout the CVSR core,
and power interchange with the dc control circuit during normal conditions in
both cases.
