CG Drives & Automation 01-7318-01r1 Functional description 143
GC dF(FRT) [G34]
This menu specifies the dynamic frequency support
parameters during under frequency rider through (UFRT)
and over frequency ride through (OFRT).
Active response to grid frequency reduction typically sets
requirement for increasing the AC output power. Therefore,
active response during UFRT needs to be handled by the
plant energy management control system and not
implemented in AFG.
dOF Mode [G341]
Enable/disable the OFRT function according to LFSM-O
(limited frequency sensitivity mode - over-frequency).
dOF Fstart [G342]
Frequency at which OFRT function should activate (start)
according to LFSM-O.
Normalized to nominal grid frequency.
dOF tstart [G343]
Delay time before activation (start) of OFRT function
according to LFSM-O.
dOF Droop [G344]
Droop (D) for LFSM-O (OFRT) function where
ΔP=(1/D[G344])*(Fstart[G342]-F)/Fnom[O12]*P(dOF)
where P(dOF) corresponds to the actual AC output power at
the instant when F reaches Fstart[G342].
dOF Fstop [G345]
Deactivation threshold frequency for LFSM-O (OFRT)
function.
dOF tstop [G346]
Deactivation delay time (if enabled) for LFSM-O (OFRT)
function. Off means that the deactivation threshold is
disabled.
t (Rbrake) max [G35]
This menu specifies the thermal limitation of the brake
resistor. It specifies the maximum short-term surge duration
for the brake resistor.
Off means that the resistor protection is disabled.
An AFG trip is triggered when the resistor on-timer reaches
t(Rb)max.
The resistor timer is decremented with a time constant of
5 minutes.
NOTE:
BCC and brake resistor is required for OFRT functionality
if the energy source cannot be controlled.
Default: Off
Off 0 Disable
On 1 Enable
Default: 100.4%
Range: 100.0% - 110.0%
Default: 0.0s
Range: 0.0s - 10.0s
G342 dOF Fstart
Stp 100.4%
Default: 5.0%
Range: 2.0% - 12.0%
NOTE:
The deactivation threshold frequency is disabled if
Fstop [G345] ≥
Fstart [G342].
Default: 110.0%
Range: 100.0% - 110.0%
Default: Off
Range:
0=Off
0.1s - 600.0s
Default: Off
Range:
0=Off
0.1 - 60.0s
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