1. Texas Synchrophasor Network Data Validation and Mining
Majority of load is in the green rectangles, i.e. “Central ERCOT”
Wind Country
120V wall outlet at U.T. Austin, and 69kV 3Φ monitor at nearby Austin Energy Harris Sub
Austin
400 miles
300 miles
Funding provided by EPRI
Equipment provided by Schweitzer Engineering Labs
Grady, Brooks, NREL, 1/27/11 1

2. The Daily Screener

3. The Daily Screener, cont.

4. The Daily Screener, cont
Hourly Summary File: PMU_Daily_Screener_ _Hourly_Report.csv

5. The Daily Screener, cont
Hourly Summary File: _Sixty_Minute_Angle_and_Freq_Report.csv

6. The Daily Screener, cont
One-Minute Averages

7. Texas Synchrophasor Network News, April 18, 2011. Page 1 of 3.
Texas Nodal Market Has Created a New West Texas Oscillation Mode with Time Period ≈ 30 minutes?
1. Unusual large, slow angle rings I had not noticed before. Period ≈ 30 mins, 10º to 15º peak-to-peak.
Zoom-In, 24 hours wide 1 1 1
Prof. Mack Grady, U.T. Austin

8. Zoom-In, 8 Hours Wide
Texas Synchrophasor Network News, April 18, Page 2 of 3.
Texas Nodal Market Has Created a New West Texas Oscillation Mode with Time Period ≈ 30 minutes?
Prof. Mack Grady, U.T. Austin

9. Texas Synchrophasor Network News, April 18, 2011. Page 3 of 3.
Texas Nodal Market Has Created a New West Texas Oscillation Mode with Time Period ≈ 30 minutes?
Sunday Morning, April 17, 2011
Prof. Mack Grady, U.T. Austin

10. Lesson 4. You Can Estimate Thevenin Equivalent Impedances Across the Grid with Synchrophasors
Wind MW Backdown. July 15, Thevenin Impedance Calculation, cont.
Use the Excel Solver with the 90 minutes of readings to
minimize least-squared error and determine Xth

11. ERCOT’s graph of West-to-North P flow
Texas Synchrophasor Network’s graph of West-to-Central ERCOT Voltage Angle
Page 4 of 5

12. The Daily Screener, cont

13. The Daily Screener, cont

14. The Daily Screener, cont

15. The Daily Screener, cont

16. The Waveform Analyzer

17. The Waveform Analyzer, cont

18. Modal Analysis, cont.

19. Modal Analysis, cont.

20. Modal Analysis, cont.

21. Modal Analysis, cont.

22. Daily Screener for April 21, 2011, GMT