Bill Adams (Georgia Power) - ecedha

Southern Company Transmission
Georgia Control Center

North American Electric Reliability
Corporation (NERC)
Eastern Interconnect
• ~700,000 MWs interconnected and
operated synchronously.
• Operations and transactions must
be closely coordinated.
• Ability to “lean” on others aids the
reliability of all participants.
• However, distant events can have
widespread impacts.

Georgia Power Company Transmission
• Transmission Lines
o 46 kV & 69 kV – 3,520 miles
o 115 kV – 5,553 miles
o 230 kV – 2,158 miles
o 500 kV – 1,100 miles
• Substations
o 227 Trans. and Gen.
o 1955 Distribution
• Load Data
o So. Control Area: 48,000 MW
o GPC: 29,800 MW

Tie Lines and Control Centers
∆
∆
∆
∆
∆
∆
∆ ∆ ∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆ ∆
∆
∆
• Tie Lines are the
transmission lines
connecting electric
utilities
• There are 53 Tie
Lines that connect
Southern Company to
neighboring utilities in
the Southeast

Southern Company Operations
• Power Coordination Center
o System Balancing Authority
o Reliability Coordinator
o Monitor Interface Flows
o Facilitate Transmission Transactions
• Local Transmission Control Centers
o Monitor and Control the Transmission System
o Facilitate Work Requests
o Local Security
o Restoration
• Distribution Control Centers
o Monitor and Control Distribution Breakers and Feeders
o Communicate with distribution customers

How Does the GCC Function
Pre-Arrange
process requests,
write safe
switching orders,
communicate with
personnel
Security
study transmission
work requests to
ensure the work is
done in a way to
keep grid reliable
Floor Operators
Support
Engineers
provide technical
guidance as
needed
System
Operators (SO)
ensure reliability
and security of the
transmission grid
in GA
Area
Operators
monitor and
control the
transmission grid
in GA in real-time

Desk Responsibilities
• Area Desks
o Monitor system conditions
o Monitor and respond to alarms
o Issue switching orders
More than 27,000 in 2010
o Respond to emergency conditions
o Dispatch field personnel as needed

Desk Responsibilities Continued
• System Operator Desk
o Perform contingency analysis and security studies
o Develop operating solutions for identified
contingencies
o Monitor system voltage schedule
o Analyze outages and assist Area desk with
restoration plans
o Communicate with PCC and external entities

Other Functions
• Pre-Arrange
o Coordinate all work requests for facility outages
More than 12,000 in 2010
o Verify feasibility of work requests through System
Security
o Write accurate and safe switching orders
o Notify all impacted parties of work requests
o Compile and distribute the daily work summary

Other Functions Continued
• System Security
o Conduct security studies/perform contingency
analysis for outage requests
o Develop necessary operating solutions to facilitate
major construction projects
o Coordinate with Transmission Planning group to help
plan to build reliable system
o Conduct annual Summer Operating Study and report
results

Other Functions Continued
• Support Engineers
o Provide technical support to other GCC groups
o Collect and distribute data from the field
o Verify equipment data with field personnel and other
operating companies
o Produce and maintain operating procedures (e.g.
Blackstart)
o Fault Data Analysis

Operator Tools
• Energy Management System (EMS)
o PNA (Power Network Analysis) –view real-time data
from EMS and also perform and build case studies
o OPNA (Offline PNA) – perform studies and N-1
contingency analysis
o EMo (Electronic Monitor) – view real-time status to
get the “big picture” quickly
o Dynamic Line Rating
o Fault Location

Operator Tools
• Other Simulation and Viewing Tools
o PowerWorld – view real-time flows, also “big picture”
o PSS/E – perform studies and in-depth contingency
analysis using modified planning model
o TransMap
o GenVarr
o Situational Awareness

Operator Tools
EMS Real-time Screenshot Example

Software Tools
PowerWorld Real-time Screenshot Example

958
1088
1084
9
5
7
3
7
3
A
BRYANT TVA
MORGANVILLE
161/46/12 KV
PRE. 151
5 1
7
TVA
WIDOWS CREEK
230/161 KV
CRAWFISH
CREEK
PRE. 181
NGEMC YOUNG
(N. LAFAYETTE)
115/25 KV
PRE. 002
B A
5
LTC LTC
783 793
5
787
791
5
717
AIM
3
RLB
1
RLB
9
058
7 5
151001
151006
5
NC
A
TVA Line
9 5
814
3
161 Meter M
9 5
824
3
9 5
858
3
7
898
5 9
OGLETHORPE
161/12 KV
9
13.0 Reactor
5
258
5
7
5 797 017
7 AOM
217 227
5 068 ROCK SPRINGS
230/161/115 KV
799 9
PRE. 129
45 MVAR
9 3 LAFAYETTE
PRE. 002
5 738 730
747 5
7 1 AOM
7 7
627
5 717
AOM
5
5 758
AOM
728
9
061441
BLD
061453
RLB
851
BLD
9
061469
BLD
5
876
717
AIM
5
FUTURE
TVA
(4)981709
TVA SW.
LAFAYETTE
CITY #3
115/12 PRE. 141
703
A
9
448
5 7
417 7
AOM
458
9
TVA Switches
161KV
4
938
3
9 7 9
NO
NO
903
3 3 3
934 924 914 AIM
5
929 5 919 5
NO NO
#3 #2 #1
NGEMC CATOOSA
161/12 KV NGEMC EDWARDS
Replaces paper & pins
PRE. 009
161/25/12 KV
PRE. 009
CHICKAMAUGA 115/25/12 KV
NGEMC
PRE. 002 (NGEMC) (GPC/TVA)
KENSINGTON
B A
#2 1B 1A
LTC LTC
LTC
763
LTC LTC
230/25 KV
2657 2647 2767 002637
5
AIM
5
AIM AIM
5
AIM
5
TVA
725
002771
TVA GPC
BLD
TVA Sw.
Line
713 714
5
723
431
BLD
859 1 3
853 5 LTC NGEMC BRISON
RLB
PRE. 028
866
5
1 3
916
5
809
917
LTC
AIM
803 827
926
805
823 TRION 115/12 KV
BLD 5
PRE. 028
801
LTC
DUG GAP (NGEMC)
115/12 KV
PRE. 028
459
BLD
427
AIM
203
BLD
LTC
3
217
RLB
201
BLD
NGEMC
443 ROPER
BLD 115/12
9
PRE. 163
RIEGEL TEXTILE
(MT. VERNON MILLS)
PRE. 138
BK 1
BK 2
Operator Tools
TransMap - Electronic Mimic Board
with electronic board
5
5
3
826
AIM
1
NGEMC
GPC
243
BLD
241
PLAIN /
WHIPS
5
941 DALTON CITY #2
RLB SHUGART ROAD
5 5 PRE. 067
5
917 953
AIM BLD
388
9 7
5
551 5
BLD
577 AIM
5
553
RLB 567 AIM
#2 #1
LTC LTC
3
5 816
AIM
1
378
9 7
5
338
9 7
3 310 5
45
331 311
MVAR
327
3 321
5
DALTON
PRIMARY 317
PRE. 028 AOM
B
A
NGEMC HASSLER
PRE. 140
5
809
851 853
RLB BLD
251 5 263
5
RLB BLD
217 5 DALTON
AIM
CITY #10
PRE. 112
DALTON CITY #9
115/25 KV
PRE. 033
7
7
7
5
358
5
348
5
368
LTC
#2
LTC
#1
9
9
9
RED
WHITE
BLACK
5
5
LTC
017
ANTIOCH
ROAD
PRE. 211
9
5 148 318 9 5
5
7 214 7
7 117 9 7
5 AOM 308 5
138
9
9
027
AIM
061
7
006
CS/AIM
LINE GRD. 716 726
80 AMP
5 719 717
TUNNEL
HILL
PRE. 192
DALTON
CITY #7
PRE. 126
B
5 017
AIM
5
051
NO
E. DALTON
E. DALTON
E. DALTON
5
581
BLD
5
A
5
RINGGOLD
PRE. 027
5
1
716 5
3
583
RLB
709
381 5
BLD
393
RLB
DALTON
CITY #1
PRE. 029
5
227
AIM
203
RLB 201
RLB
1
726
3
#1 #2
LTC LTC
704
AIM
SWITCHES IN
KIKER SUB.
153609
153519
RLB
027781
BLD
5
5
153511
BLD
967
AIM
983
5
501 509
RLB RLB
5
506
80 AMP
VARNELL
PRE. 153
DALTON
CITY #4
PRE. 028
BK B BK A
957
AIM
991
BLD
673 671
BLD BLD
679
BLD
3
707
NGEMC
100 A
WHITFIELD
767
713 IND. PARK
AOM
NGEMC 3
TILTON
PRE. 027
NGEMC
CENTER POINT
PRE. 033
5
5
NGEMC
WHITFIELD
PRE. 027
B
5
757
AOM
157
AIM
181
RLB
5
5
DALTON
CITY #8
PRE. 112
3
A
CALHOUN #1
PRE. 027
5
883
893
5
887 897
AIM 5 AIM
743
BLD 741
BLD
147
AIM
173
RLB
019213
RLB
717
AIM
3
A
019211
5
727
AIM
LTC
B
PRE. 027
3

Reliability Tools
• Weather Forecasts
• Lightning Tracker
• Fault Data Analysis
• Geographic Information System
• Summer Operating Study
• Sub-Transmission Automation

Weather Reports

• FALLS…
Fault
Analysis
and
Lightning
Location
System
Determine Location of Lightning Event

Operator Tools
EMS Real-time Screenshot Example

Summer Operating Database - Overload

Current Issues
• Reliability Standards
• Cyber Security
• Employee Skills and Training
• Staffing

Questions