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3.2.15
Inverter reactive power setting: Q-U curve
The voltage related control mode Q(U) controls the reactive power output as a function of the voltage.
There are four coordinate points that are adjustable in the curve and the difference between non-hysteresis and hysteresis
control shown in the figure below.
The coordinate points are the voltage as a percentage of U
n
and the reactive power as a percentage of P
n
.
Some grid companies may require two active power thresholds as a percentage of P
n
to activate or deactivate this function.
These active power thresholds are referred to as
‘
lock-in
’
and
‘
lock-out
’
active power.
Activation threshold as a percentage of P
n
corresponds to ‘lock-in’ active power.
Deactivation threshold as a percentage of P
n
corresponds to ‘lock-out’ active power.
Fig. 29: Q-U curve
