.PowerGrids.Electrical.Controls.ExcitationSystems.VRProportional .PowerGrids.Electrical.Controls.ExcitationSystems.VRProportionalThe class implements a simple model of a proportional static exictation with limiter.
The Limiter enforces saturations only after they were violated without interruption during a certain amount of time.
If fixInitialControlledVariable = true, an initial
equation is added to ensure that the machine voltage
VcPu is equal to its start value
VcPuStart. In order to fulfill this condition, the
initial value of the reference signal should be free, so that the
Modelica tool can back-compute it automatically. For this purpose,
the PowerGrids.Controls.FreeOffset
block should be used to generate the reference signal to be
connected to the VrefPu input.
In case the condition VcPu = VcPuStart cannot be
fulfilled without violating the controller saturations, then an
alternative initial condition is enforced, which prescribes the
saturation block input so as to obtain a certain degree of
oversaturation oversaturationPu. This allows to
back-compute a unique initial value of the reference signal, which
is of course dependent on oversaturationPu and hence
somewhat arbitrary.