Generator Data SubmittalsGenerator Data Submittals5/8/08

2008 Transmission Customer ForumBob Jones

Transmission PlanningSouthern Company Transmission

5/8/082008 Transmission Customer Forum

Bob JonesTransmission Planning

Southern Company Transmission

Presentation Outline• Reasons for Generator Data Submittals

• Observations from returned 2007 Generator Data Submittals

• Possible changes to 2008 Generator Data Submittals

Transition Time• NERC standards

• SERC Supplements

• Voluntary compliance

• FERC approved standards

• Mandatory compliance

• Fine for non-compliance

Reasons for Generator Data Submittals

August 14, 2003 Northeast Blackout

– Recommendation 24: Improve quality of system modeling data and data exchange practices.

• The after-the-fact models developed to simulate August 14 conditions and events found that the dynamic modeling assumptions for generators were frequently inaccurate.

SERC SupplementSystem Modeling Data RequirementsNERC Reliability Standards MOD-010through 015

SERC SupplementVerification of Generator Real and Reactive Power CapabilityNERC Reliability StandardsMOD-024 and MOD-025

Supports reliability through accurate modeling

SERC Model Data Requirements• Model Data Validation Requirements:

– A. Comparison of power flow model to state estimator snapshot

– B. Reactive load verification of power flow models– C. Validation of transformer tap settings– D. Modeling of significant system disturbances and

stressed system conditions– E. Validation of generator excitation systems– F. Validation of power system stabilizers

SERC Requirements (cont.)• Requirement C - Validation of transformer tap

settings– SERC members shall have a procedure to validate the

transformer tap settings used in power flow models by comparing to actual equipment settings (field check) at least every five (5) years.

SERC Requirements (cont.)• Requirement E - Validation of generator

excitation systems– SERC members shall validate the excitation system

model parameters of their generating units. – Each generator owner will be given a period of seven

(7) years (from February 2005) to perform open circuit step response (OCSR) tests on all of the units for which it is required.

Members must be in compliance by: February 1, 2012

SERC Requirements (cont.)• Requirement F - Validation of power system

stabilizers– SERC members shall validate the power system

stabilizer model parameters of their generating units.

SERC Generator MW and Mvar Validations

• Supplement for MOD-024 and MOD-025• Procedures for verification of gross and net real power

– Annual requirement• Procedures for verification gross and net reactive

power– To be done by January 1, 2012

SCT’s Plan for Meeting the NERC/SERC Requirements• Develop and update a generator capability

database for MW, Mvar and GSU tap verifications.

• Develop a database for generator dynamic model verifications

• Use Generator Data Submittal to confirm data that we have

2007 Generator Data Submittal• Confirm your single line is correct• Report your gross and net real and reactive power

capability• Limiting factor for reactive output?• Excitation system mode of operation, model data

available?• PSS test reports, model data available?• Confirm GSU taps and data

ssgn PPP

Pg (model)

Pss (model)

Pn (model) Pg Pss Pn

PnDate

MW MW MW MW MW MW Mo/Yr

208 208 May-07149 5.4 143.6 May-07149 3.6 145.4 May-07

Real PowerCapability

ssgn QQQ minmin

Qgmax (model)

Qgmin (model)

Qss (model)

Qnmax (model)

Qnmin (model) Qgmax Qgmin Qss Qnmax Qnmin

QnmaxDate

QnminDate

Mvar Mvar Mvar Mvar Mvar Mvar Mvar Mvar Mvar Mvar Mo/Yr Mo/Yr

140 -35 140 -35 -50 -50 11-Aug 23-Aug

130 -35 4 126 -39 120 -50 116.0 -54 22-Aug 23-Aug

130 -35 4 126 -39 120 -50 116.0 -54 23-Aug 23-Aug

Reactive Capability

Most common confusionVoltage limits at the generator bus

due to station auxiliary bus voltage limits

Qmax Qmin Qnmax Qnmin VHI VLOW

1 2 1 1 4350 V 3800 V1 2 1 1 4350V 3800V1 2 1 1 4350V 3800V

Station Auxiliary Bus Voltage Limits

ReactiveLimiting Factor

Reactive Verif.Method

Possible Additions for 2008• Exciter Model Data Verification

– Give you what model and parameters we have– Ask you to confirm if these are still valid– Ask you to supply open circuit step response test data (if

you have done this)

Excitation System Data Validation

1.02

1.00

Generator Terminal Voltage

Measurement (Green)

Simulation (Blue)

Generator Terminal Voltage

Simulation (Blue)

Measurement (Green)

Possible Additions for 2008• Underfrequency Relay Setting Coordination

– Included in Pre-Synch Data Requirements (now, hasn’t always been)

– Attach turbine underfrequency relay frequency versus time characteristic including trip and alarm setpoints.

Southern Balancing AreaGenerator UF Coordination Curve

5454.5

5555.5

5656.5

5757.5

5858.5

5959.5

60

1 10 100 1000 10000

Accumulated Time (Cycles)

Fre

qu

ency

(H

z)

Summary• Generator data submittal has been an effective way to

verify model data

• Helps improve the accuracy of our system simulations

• May add exciter model verification and underfrequency relay coordination in 2008

Call if you have any questions!

Cheryl JohnsonPhone: (205) 257-3401

Fax: (205) 257-6663Email: cljohnso@southernco.com