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Southern Company Transmission

Georgia Control Center


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Eastern Interconnect

~700,000 MWs interconnected and

operated synchronously. Operations and transactions must

be closely coordinated.

Ability to lean on others aids thereliability of all participants.

However, distant events can havewidespread impacts.

North American Electric Reliability

Corporation (NERC)


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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 mileso 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


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Tie Lines and Control Centers

Tie Lines are thetransmission linesconnecting electricutilities

There are 53 TieLines that connectSouthern Company toneighboring utilities inthe Southeast


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Power Coordination Centero System Balancing Authority

o Reliability Coordinator

o Monitor Interface Flows

o Facilitate Transmission Transactions

Local Transmission Control Centerso Monitor and Control the Transmission System

o Facilitate Work Requests

o Local Security

o Restoration

Distribution Control Centerso Monitor and Control Distribution Breakers and Feeders

o Communicate with distribution customers

Southern Company Operations


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How Does the GCC Function?

Floor Operators

SystemOperators (SO) AreaOperators

ensure reliabilityand security of thetransmission grid

in GA

monitor andcontrol the

transmission gridin GA in real-time

Pre-Arrange

process requests,write safe

switching orders,communicate with

personnel

Security

study transmissionwork requests to

ensure the work isdone in a way tokeep grid reliable Support

Engineersprovide technical

guidance asneeded


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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 withrestoration plans

o Communicate with PCC and external entities

Desk Responsibilities Continued


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Other Functions

Pre-Arrange

o Coordinate all work requests for facility outages

1More than 12,000 in 2010

o Verify feasibility of work requests through SystemSecurity

o Write accurate and safe switching orders

o Notify all impacted parties of work requests

o Compile and distribute the daily work summary


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Other Functions Continued

System Security

o Conduct security studies/perform contingencyanalysis for outage requests

o Develop necessary operating solutions to facilitatemajor construction projects

o Coordinate with Transmission Planning group to helpplan to build reliable system

o

Conduct annual Summer Operating Study and reportresults


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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 otheroperating companies

o Produce and maintain operating procedures (e.g.Blackstart)

o Fault Data Analysis


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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 analysiso EMo (Electronic Monitor) view real-time status to

get the big picture quickly

o Dynamic Line Rating

o Fault Location


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Operator Tools

Other Simulation and Viewing Toolso PowerWorld view real-time flows, also big picture

o PSS/E perform studies and in-depth contingencyanalysis using modified planning model

o TransMapo GenVarr

o Situational Awareness


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EMS Real-time Screenshot Example

Operator Tools


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PowerWorld Real-time Screenshot Example

Software Tools


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Reliability Tools

Weather Forecasts

Lightning Tracker

Fault Data Analysis Geographic Information System

Summer Operating Study

Sub-Transmission Automation


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Weather Reports


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Determine Location of Lightning Event

FALLSFault

AnalysisandLightning

Location

System


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EMS Real-time Screenshot Example

Operator Tools


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Summer Operating Database - Overload


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Current Issues

Reliability Standards

Cyber Security

Employee Skills and Training Staffing


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Questions?

Documents

EMS Picture