Generator Data RequestsGenerator Data Requests9/21/06

2006 Transmission Customer ForumShih-Min Hsu

Transmission PlanningSouthern Company Transmission

9/21/062006 Transmission Customer Forum

Shih-Min HsuTransmission Planning

Southern Company Transmission

Presentation Outline• Motivation for Generator data request

• SERC model data requirements

• Southern Company Transmission’s plan for meeting the requirements

• Generator Data Submittal

Motivation for Generator Data Request• 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 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 real and reactive power

continuous capability– F. Validation of generator excitation systems– G. 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 real

and reactive power continuous capability– MW validations should have been performed by February

2006.– MW ratings to be confirmed yearly as stated in SERC

Supplement Verification of Generator Real and Reactive Power Capability.

– Mvar validations shall be performed in accordance with the procedure given in the same document.

– Each generator owner will be given a period of five (5) years (1/1/2012) to perform these initial Mvar validations.

SERC Requirements (cont.)

• Requirement F - 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.

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

stabilizers– SERC members shall validate the power system

stabilizer model parameters of their generating units. – This section applies only to power system stabilizers

that have been tuned and placed into service.

Letter of Certification to SERC

MOD-012 LOC (Generation) - Dynamics Data for Modeling and Simulation of the Interconnected Transmission System - 2006

Southern Company Transmission’s Plan for Meeting the SERC Requirements• Develop the required procedures.

• Develop and update the generator reactive capability database, including MW, Mvar and GSU tap verifications.

• Develop the generator dynamic database, including generator, exciter, governor and PSS.

• Generator Data Submittal.

Generator Data Submittal

Generator Data Submittal (cont.)2. Unit Capability:

ST1

CT1A

CT1B

Running stationauxiliary

MW/Mvar

Running stationauxiliary

MW/Mvar

Net MW/Mvar

Gross MW/Mvar

Net MW/Mvar

Gross MW/Mvar

Generator Data Submittal (cont.)

Excitation System Data Validation

1.02

1.00

Generator Terminal Voltage

Measurement (Green)

Simulation (Blue)

Generator Data Submittal (cont.)

Generator Data Submittal (cont.)

Generator Data Submittal (cont.)

Questions?