ABB RELION 630 Series Technical Manual page 294

Section 7
Power management functions
288
The spinning reserve for subnetwork z RCV_SR_POW
RCV_LS_POW2 provided spinning reserve status is active for corresponding
electrical area. If both power source 1 and power source 2 are in same subnetwork,
is the sum of RCV_LS_POW1 and RCV_LS_POW2.
RCV_SR_POW
z
The must-shed for subnetwork z RCV_MS_POW
RCV_LS_POW2 provided must-shed status is active for corresponding electrical area.
If both power source 1 and power source 2 are in same subnetwork, RCV_MS_POW
sum of RCV_LS_POW1 and RCV_LS_POW2.
Based on the active powers and power flow direction of network circuit breakers and
subnetwork number of the busbar, the module calculates the total active power for
each busbar in the subnetwork z as POWER_BB
Equation 12 calculates the total running load RUNNING_LOAD
z.
RUNNING LOAD _ ACT POWER
=
z
GUID-0AF1F9E8-3C3C-4722-8703-350E95AA5A32 V1 EN
Equation 13 calculates the load imbalance LOAD_IMBALANCE
z.
=
LOAD IMBALANCE _
z
GUID-E9C3C4A8-ED7C-4F24-9224-0ED4EA92E1C7 V1 EN
Equation 14 calculates the power balance POWER_BAL
using SubNetw Abs offset and SubNetw Rel offset settings.

= +
POWER BAL _ 1 0 . SubNet

z

GUID-BE3CDA6B-78B8-48BB-A963-5EC81BD16553 V1 EN
Equation 15 calculates the effective power balance EFF_POW_BAL
z.
EFF POW BAL _ _ POWER BAL
=
z
GUID-D8AAFC84-9B1B-48AE-AE61-DDE32B8214DE V1 EN
Based on the subnetwork number of busbar 1...4, this module calculates the total
amount of overload power OV_LOAD
as the sum of all overload amounts for busbars in the corresponding subnetwork.
The calculated AVA_POWER
and RCV_MS_PO
OV_LOAD
z
module.
z
_ POWER BB _
+
z
−
AVA POWER _ RUNNING LOAD
z
1

⋅  ⋅
Re l offset LOAD IMBALANCE
100 
_ RCV SR POW _ _
+
z
for subnetwork z. The OV_LOAD
z
, RUNNING_LOAD
z
are provided to the Subnetwork priority calculation
z
1MRS757256 F
is same as RCV_LS_POW1 or
z
is same as RCV_LS_POW1 or
z
.
of each subnetwork
z
z
of each subnetwork
z
_
z
of each subnetwork z by
z
−
_ S S ubNet
z
for subnetwork
z
z
z
, POWER_BAL , EFF_POW_BAL
z z
PML630/Compact Load-Shedding Solution
Technical Manual
is
z
(Equation 12)
(Equation 13)
Re l offset
(Equation 14)
(Equation 15)
is calculated
,
z