ABB Relion 630 Series, Техническое руководство

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The reset acknowledged status, record1 priority, cause of load-shed and load-
shedding enabling status for the subnetworks are provided to the General logic
module.
7.8.4.7 Peer load shed logic
This module receives the must-shedding mode
MUST_SHD_MOD
and spinning
reserve mode
SP_RESV_MOD
from the NPMMXU function.
The module processes the load-shed data of the subnetwork corresponding to the
subnetworks of power source 1 and power source 2 for adjacent electrical areas.
• Calculation of
SND_LS_POW1
and
SND_LS_POW2
when power source 1 and
power source 2 subnetworks are different
The load-shed power
SND_LS_POW1
is calculated as must-shedding power or
spinning reserve power based on must-shedding status or spinning reserve status
of power source 1 subnetwork.
If
MUST_SHD_STS
z
is active,
SND_LS_POW1
is same as
MUST_SHD_POW
z
.
If S
P_RESV_STS
z
is active,
SND_LS_POW1
is same as
SP_RESV_POW
z
.
Similarly,
SND_LS_POW2
is calculated as must shedding power
or spinning reserve power based on must-shedding status or
spinning reserve status of power source 2 subnetwork.
• Calculation of
SND_LS_POW1
and
SND_LS_POW2
when power source 1 and
power source 2 subnetworks are same.
Table 327: Calculation of load-shed powers for adjacent electrical areas
Must-shedding status or spinning
reserve status
Must-shedding mode or spinning reserve
mode
SND_LS_POW1 SND_LS_POW2
MUST_SHD_STS
z
= Active MUST_SHD_MOD = 1 (Half-Half) MUST_SHD_POW
z
*0.5 MUST_SHD_POW
z
*0.5
MUST_SHD_MOD = 2 (Zero-Full) MUST_SHD_POW
z
*0 MUST_SHD_POW
z
*1
MUST_SHD_MOD = 3 (Full-Zero) MUST_SHD_POW
z
*1 MUST_SHD_POW
z
*0
SP_RESV_STS
z
= Active SP_RESV_MOD = 2 (SP_RESV_POW
z
+
RCV_SR_POW
2
) *1
(SP_RESV_POW
z
+
RCV_SR_POW
1
) *1
SP_RESV_MOD = 3 (SP_RESV_POW
z
+
RCV_SR_POW
2
) *0
(SP_RESV_POW
z
+
RCV_SR_POW
1
) *1
SP_RESV_MOD = 4 (SP_RESV_POW
z
+
RCV_SR_POW
2
) *1
(SP_RESV_POW
z
+
RCV_SR_POW
1
) *0
7.8.4.8 General logic
This module calculates the load-shedding start and load-shedding operation outputs
based on the load-shedding triggers and the cause of load-shed.
1MRS757256 F
Section 7
Power management functions
PML630/Compact Load-Shedding Solution 293
Technical Manual