ENH: Maximum produced/consumed reactive power

[benoit9126]

Describe the feature you want. What problem does it solve?
For flexible loads, the value s_max defines the maximum reactive power which can be consumed or produced for the Q(U) control. It would be great to define in this control two optional values to define the q_min and q_max to limit the maximum reactive power which can be consumed or produced.

Example:

from roseau.load_flow import FlexibleParameter, Control, Projection, Q_

fp = FlexibleParameter(
    control_p=Control.constant(),
    control_q=Control.q_u(
        u_min=Q_(210, "V"), u_down=Q_(220, "V"), u_up=Q_(240, "V"), u_max=Q_(250, "V"),
        q_max=Q(2.5, "kVAr"), # <----- New value
        q_min=Q(-2, "kVAr"), # <----- New value
    ),
    projection=Projection(type="keep_p"),
    s_max=Q_(5, "kVA"),
)

In the Q(U) theoretical curve (see below), it will q_max/s_max would replace the "1" on the Y axis and q_min/s_max the "-1" on the Y axis. At any time, the value Q provided by the user must lie between q_min and q_max. Obviously, abs(q_min)<s_max and abs(q_max)<s_max and q_min<q_max

@YassineAbdelouadoud

[YassineAbdelouadoud]

I would propose two additional specifications if possible :

• Add the possibility to define q_max and q_min as percentage of s_max. This could be done by specifying the unit : q_max=Q(40, "percent")
• Add the possibility to set the reactive value inside the dead band (with a default value of 0)

[Saelyos]

@YassineAbdelouadoud

Unfortunately specifying different units for q_min and q_max is a bit complicated, especially when the values are updated as s_max, q_min and q_max are linked together. I think it is better to leave it in the client code.

Could you specify what you mean by

Add the possibility to set the reactive value inside the dead band (with a default value of 0)

Thanks.

[YassineAbdelouadoud]

By inside the dead band, I mean when the voltage is comprised between u_down and u_up. Adding the possibility to set the reactive power to a non-zero value would give another degree of freedom when configuring the Q(U) control.

[alihamdan]

By inside the dead band, I mean when the voltage is comprised between u_down and u_up. Adding the possibility to set the reactive power to a non-zero value would give another degree of freedom when configuring the Q(U) control.

Q is not set to zero in this voltage range, it is set to the "theoretical reactive power" which you already have control over when you do load = PowerLoad(id="ld", bus=bus, powers=Pth+1j*Qth, flexible_params=...) (see the figure above). Is this the value you are asking for or did I not understand what you wanted?

[YassineAbdelouadoud]

My apologies, I missed the fact that this parameter was already available through the PowerLoad definition.