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2.2.15
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 can be adjustable in the curve and the difference between non-hysteresis and
hysteresis control shown as below figure.
The coordinate points are the voltage as a percentage of Un and the reactive power as a percentage of Pn.
Some grid company maybe requires two active power thresholds as a percentage of Pn to activate or deactivate the
function. The active power thresholds normally call
‘
lock-in
’
and
‘
lock-out
’
active power.
Activation threshold as a percentage of Pn corresponds to ‘lock-in’ active power.
Deactivation threshold as a percentage of Pn corresponds to ‘lock-out’ active power.
Fig. 35: Q-U curve