Generator Data Requests

1. Generator Data Requests 9/21/06 2006 Transmission Customer Forum Shih-Min Hsu Transmission Planning Southern Company Transmission

2. Presentation Outline • Motivation for Generator data request • SERC model data requirements • Southern Company Transmission’s plan for meeting the requirements • Generator Data Submittal

3. 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.

4. 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 powercontinuous capability • F. Validation of generator excitation systems • G. Validation of power system stabilizers

5. 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.

6. 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.

7. 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.

8. 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.

9. Letter of Certification to SERC MOD-012 LOC (Generation) - Dynamics Data for Modeling and Simulation of the Interconnected Transmission System - 2006

10. 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.

11. Generator Data Submittal

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

13. Generator Data Submittal (cont.)

14. Excitation System Data Validation Simulation (Blue) 1.02 Measurement (Green) Generator Terminal Voltage 1.00

15. Generator Data Submittal (cont.)

16. Generator Data Submittal (cont.)

17. Generator Data Submittal (cont.)

18. Questions?