ABB RELION 630 Series Technical Manual page 293

1MRS757256 F
PML630/Compact Load-Shedding Solution
Technical Manual
• Island-parallel status ISL_PAR_BB1...ISL_PAR_BB4 for busbar 1...4
• Overload amount OV_LOAD_BB1...OV_LOAD_BB4 for busbar 1...4
• Load-shed power RCV_SR_POW1 and RCV_SR_POW2 for adjacent electrical
areas
• Spinning reserve status RCV_SR_STS1 and RCV_SR_STS2 for adjacent
electrical areas
• Must shed status RCV_MS_STS1 and RCV_MS_STS2 for adjacent electrical
areas
This module receives the network circuit breaker power POWER_CB
corresponding instances of NCBDCSWI functions.
If COMP_STS_SRC<n> is inactive for a power source, the available power for
corresponding power source is zero.
If island-parallel status ISL_PAR_BB<x> (x = 1, 2, 3 and 4) is active for any busbar
in a subnetwork, the corresponding subnetwork is considered as in parallel mode else
the subnetwork is considered as in island mode.
Based on the island or parallel mode of the subnetwork and the governor mode of the
generator, the available power of a generator in the corresponding subnetwork is
calculated as shown in Table
Table 324: Available power calculation of the generator
Governor mode
Not applicable
Droop
MW
ISO
P-Control
Optimize
Base load
Peak load
Based on the subnetwork number of power sources, the module calculates total
available power AVA_POWER
power of all power sources in the subnetwork z.
The total active power ACT_POWER
the power sources with the subnetwork number z.
Based on the subnetwork number of power source 1 and power source 2, the module
processes the spinning reserve and must-shed received from adjacent electrical areas
for corresponding subnetwork z as follows.
Power management functions
324.
Source available power
Island Mode
Available power
Available power
Active power
Available power
Available power
Available power
Active power
Active power
in subnetwork z. AVA_POWER
z
in subnetwork z is the sum of active powers of
z
Section 7
from the
ij
Parallel Mode
Available power
Active power
Active power
Active power
Available power
Active power
Active power
Active power
is the sum of available
z
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