Static var compensator voltage control increasing

[annetill]

• Do you want to request a feature or report a bug?

A feature.

• What is the current behavior?

We model the voltage remote control of static var compensator as we do with generators with PQV nodes and equations that link the reactive power of controllers (2 by 2).

• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem

It is not a bug but sometimes we prefer to have an simplified approach.

• What is the expected behavior?

When the cim:StaticVarCompensator.slope is positive (and present in an IGM CIM-CGMES file), the reactive output of the SVC is defined by:
Q=(V_bus-V_ref)/slope
Where:
cim:StaticVarCompensator.slope is positive based on the load sign convention.
Vbus is the voltage at the controlled point determined by cim:RegulatingControl.Terminal which may be local or remote.
Vref is the target value given by cim:RegulatingControl.targetValue.

Extract from the ENTSO-E implementation guide for CGM data modeling 1.0

• What is the motivation / use case for changing the behavior?

• Please tell us about your environment:

  • PowSyBl Version: ...
  • OS Version: ...

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, spectrum, etc)

(if a question doesn't apply, you can delete it)

[geofjamg]

Such equipment may also have reactive power limits?

[annetill]

This model could be useful.

The generator model represents the slope by connecting ths SVC to an auxiliary bus separated from the high voltage bus by a reactance equal to the per unit slope. When the SVC is operating the limits, its behaves like a fixed susceptance and its injected reactive power is proportional to the square of the regulated bus voltage.

[geofjamg]

Done in #391