component requirements

Signed-off-by: Jerry Guo <Jerry.Jinfeng.Guo@alliander.com>

Author: Jerry-Jinfeng-Guo

docs/user_manual/calculations.md

@@ -667,7 +667,7 @@ This assumption is reflected in the requirements mentioned in {hoverxreftooltip}
 ```
 
 ```{note}
-The control logic assumes that the (compensated) control voltage decreases when the tap position increases.
+The control logic assumes that the (compensated) control voltage decreases when the tap position changes (increases when the control side of the regulator and the tap side of the transformer are at different sides, or decreases they are at the same side).
 If the line drop compensation impedance is high, and the control side has generator-like behavior, then this assumption does not hold, and the calculation may diverge.
 Hence, this assumption is reflected in the requirements mentioned in {hoverxreftooltip}`user_manual/components:Line drop compensation`.
 ```

docs/user_manual/components.md

@@ -814,7 +814,6 @@ The actual grid state is not changed after calculations are done.
 
 The following additional requirements exist on the input parameters.
 
-- The automatic tap changer algorithm currently only supports tap changers connected at HV side of the transformer. Hence, the rated voltage of the node at the `tap_side` must be greater than or equal to the rated voltage of the node at the other side of transformer.
 - Depending on the resultant voltage being transformed, the voltage band must be sufficiently large: At zero line drop compensation if the expected resultant voltages are in the proximity of the rated transformer voltages, it is recommended to have the $u_{band} >= \frac{u_2}{1+ u_1 / \text{tap}_{\text{size}}}$
 - The line drop compensation is small, in the sense that its product with the typical current through the transformer is much smaller (in absolute value) than the smallest change in voltage due to a change in tap position.