can be activated either at minute 2 of the maximum demand scenario
1 or at minute 3 of the maximum demand scenario 2.
This module inhibits
MAX_DMD_ALM
output in any of the following conditions.
•
The input
INHIBIT_TRG
is TRUE.
•
The input
SLS_DISABLE
is TRUE.
•
The load-shedding blocking status (from the Block logic module) is TRUE.
If the Demand based load shed module is disabled,
MAX_DMD_ALM
is FALSE, and
the
AVG_DEMAND
and
PERIODIC_KWH
outputs are zero.
This module provides the
MAX_DMD_ALM
to Slow load shed logic module and Binary
to integer module.
7.4.4.8
Slow load shed logic
This module calculates the available power, active power, slow load-shedding start,
slow load-shedding trigger and slow load trigger inhibition signals. The Slow load
shed logic module also calculates the overload amount during the overloading of the
power source.
If the load-shedding blocking status is TRUE due to bad IED quality in the circuit
breaker open position and the
Bypass block
setting is “Quality bad CB open”, the
outputs
AVA_POWER
and
ACTIVE_POWER
are zero, else the outputs are the same as
the available power and active power calculated in the Power monitoring module.
The slow load shed start and slow load-shedding trigger signals are activated based on
various conditions, provided active power of the power source is positive. If the active
power value is negative, the slow load-shed start and slow load-shedding trigger
signals remain inactive.
The slow load-shedding start is activated if any of the following conditions satisfy.
•
The
OC_STR
output is TRUE.
•
The
MAX_DMD_ALM
output is TRUE.
•
The external slow load-shedding trigger changes from FALSE to TRUE.
The slow load-shedding trigger is activated if any of the following conditions satisfy.
•
The
OC_OPR
output is TRUE.
•
The
MAX_DMD_ALM
output is TRUE.
•
The external slow load-shedding trigger changes from FALSE to TRUE.
The slow load-shedding trigger is provided by the
SLOWLS_OPR
output.
Section 7
1MRS757256 F
Power management functions
226
PML630/Compact Load-Shedding Solution
Technical Manual
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