Load-Shed Sharing Mode - ABB RELION 630 Series Technical Manual

Section 7
Power management functions
7.7.4.7
Table 311: Calculation of must-shedding sharing mode
Sl No Condition1
1 If all the following conditions are satisfied:
• Grid1 connectivity setting is Peer substation.
• Input PPLS1_QVAL is Good.
• COMP_CB_SRC1 is TRUE.
• ENA_PPLS1 signal is TRUE.
• RCV_MS_STS1 is FALSE.
• LS_BLK_STS1 is FALSE.
2
X condition1
3
condition1
Y
4
condition1
X
270
If the fast load-shedding trigger is activated for any power source (power source
1...power source 8), fast load-shedding trigger SRC_FLS_TRG is activated.
The busbar number of power sources are represented by BB_NUMBER signal. For
example, the BB_NUMBER = 4332121 represents busbar number of power source 1 =
1, busbar number of power source 2 = 2, busbar number of power source 3 = 1, busbar
number of power source 4 = 2, busbar number of power source 5 = 3, busbar number
of power source 6 = 3, busbar number of power source 7 = 4 and busbar number of
power source 8 = 4.
The module reports the slow load-shedding start and fast load-shedding trigger signal
to the Binary to integer module.
The module reports the slow load-shedding trigger and slow load-shedding enabling
status signals for each power source to the Busbar logic module.

Load-shed sharing mode

The module calculates the spinning reserve sharing mode and must-shedding sharing
mode. These modes determine how to share the spinning reserve and must shed with
the PML630s installed in the adjacent electrical network areas.
Based on the condition1 and condition2, the module calculates the must-shedding
sharing mode MUST_SHD_MOD and spinning reserve sharing mode SP_RESV_MOD
as shown in Table 311 and
Table 311 and Table 312
sharing mode and spinning reserve sharing mode, for example, must-shedding sharing
mode = 2 (Zero-full) means the must-shedding shared with adjacent electrical
network area1 is zero and the must-shedding shared with adjacent electrical network
area 2 is full.
Condition2
Table 312.
also show the values corresponding to the must-shedding
If all the following conditions are satisfied:
• Grid2 connectivity setting is Peer substation.
• Input PPLS2_QVAL is Good.
• COMP_CB_SRC2 is TRUE.
• ENA_PPLS2 signal is TRUE.
• RCV_MS_STS2 is FALSE.
• LS_BLK_STS2 is FALSE.
Y condition2
condition2
X
condition2
X
1MRS757256 F
MUST_SHD_MOD
Extended LS
sharing setting
2 (Zero-full)
3 (Full-zero)
Extended LS
sharing setting
PML630/Compact Load-Shedding Solution
Technical Manual