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Page 18
2.2.10
Inverter active power setting: over-voltage curve
The inverter may be capable of activating active power response to overvoltage at a programmable voltage threshold with
a programmable droop. There are five mode can be chosen here.
Fix gradient and non-
hysteresis: ∆P is the active power as a percentage o
f Pn, the inverter provide non-hysteresis in the
control of active power response to overvoltage.
Fix
gradient and hysteresis: ∆P is the active power as a percentage of Pn, the inverter provide hysteresis in the control of
active power response to overvoltage.
Variable gradient and non-
hysteresis: ∆P is the active power as a percentage of PM, the inverter provide non
-hysteresis in
the control of active power response to overvoltage.
Variable gradient and hysteresis: ∆P is the active power as a percentage of
PM, the inverter provide hysteresis in the
control of active power response to overvoltage.
The below figure descripts the difference between hysteresis and non-hysteresis control.
Here,
fn: The rated voltage
freset: Reset voltage
fstart: Starting voltage
fstop: Stopping voltage
∆
P : Active power in percentage during reducing
Intentional delay time for P(f) is only active for the activation of the function after the voltage over Ustart, and the
intentional delay time plus inherent dead time shall be less than 2s
Min. delay time for active power release is the delay time that the active power can increase after the voltage below U
reset.
