Basler DECS-250 User Manual

9440300990 12-5
DECS-250 Grid Code
LFSM Droop Settings
The LFSM-U Droop setting establishes the underfrequency droop curve and the LFSM-O establishes the
overfrequency droop curve. These curves, represented by the green lines in Figure 12-4, do not
necessarily have to be the same.
LFSM Max Power Limit Settings
The LFSM-U Max Power Limit Start Frequency setting establishes the frequency at which the generating
unit can limit maximum output power during underfrequency conditions. The LFSM-O Max Power Limit
Start Frequency setting establishes the frequency at which the generating unit can limit maximum output
power during overfrequency conditions.
The LFSM-U Max Power Limit Derate setting establishes the power output derating curve for an
underfrequency condition. The LFSM-O Max Power Limit Derate setting establishes the power output
derating curve for an overfrequency condition. These curves, represented by the blue lines in Figure 12-4,
do not necessarily have to be the same.
LFSM Power Ramp Rate Settings
Power output ramp rates are established by the LFSM Power Increase Rate and LFSM Power Decrease
Rate settings. These rates are used when LFSM is active.
Figure 12-4. LFSM Characteristic and Maximum Power Limit Characteristic
Grid Recovery Mode
When the DECS-250 is operating in LFSM and the grid frequency returns to normal (within the dead
band), Grid Recovery mode becomes the active control mode. In this mode, grid recovery ramp rates are
used and grid frequency must remain within the dead band for the duration for the grid recovery timer
before returning to Active Power Control mode.
F
P
LFSM-U
Dead
Band
(hz)
LFSM-O
Dead
Band
(hz)
LFSM-U Max
Power Limit
Start Frequency
(hz
)
LFSM-O Max
Power Limit
Start Frequency
(hz)
LFSM-U
Droop (%/hz)
LFSM-O
Droop (%/hz)
LFSM-U Max Power Limit
Derate (%/hz)
LFSM-O Max Power
Limit Derate
(%/hz)
Limited Frequency Sensitive Mode Characteristic and Maximum Power Limit Characteristic
Maximum Power Limit
Characteristic is Blue
LFSM Characteristic is Green
P0087-77

Basler DECS-250 Specifications

General

Brand	Basler
Model	DECS-250
Category	Control Systems
Language	English