_01_EE394J_2_Spring12_Texas_Synchrophasor_Events.doc. Events automatically detected by our PMU_Waveform_Analyzer. Event 1. Jan. 03, 2012.

Transcription

1 Event 1. Jan. 03, :44 GMT No wind generation. West Texas is importing power Straight-Line Miles miles 100 miles miles 22 Steady-state angle rises No unit tripped Conclusion line trip or opening of series caps to South Texas. Easily visible throughout ERCOT. Page 1 of 11

2 Event 2. Jan. 03, :14 GMT Good wind Strong ringdown, but steadystate angle does not change No unit tripped. Conclusion South Texas event, cause unknown. Page 2 of 11

3 Event 3. Jan. 03, :06 GMT Moderate wind. Steady-state angle rises Small steady-state angle rise in the short distance between Waco and Austin. More power flowing from north to central Small drop in steady-state angle. Less power flowing from south to central Frequency a bit high, but no unit trip. Conclusion possible line trip to West Texas. Page 3 of 11

4 Event 4. Jan. 07, :55 GMT Good wind. Sudden drop in steady-state angle Unit trip. Poor frequency recovery Conclusion unit trip in West Texas. Page 4 of 11

5 Event 5. Jan., :25 GMT Strong wind. Small steadystate angle drops Steady state angle drops Unit trip. Poor frequency recovery. Conclusion unit trip in South Texas. Page 5 of 11

6 Event 6. Jan., :31-32 GMT Strong wind. West Texas steady-state angle drops slightly Slight drop in steady-state angle, and power flowing south Slight angle drop in South Texas Abrupt load shedding? Conclusion load shedding. Shedding was not in South Texas, and was not in West Texas. Page 6 of 11

7 Event 7. Jan. 10, :42 GMT Strong wind. West Texas sees a bump, followed by a sec. of undamped oscillation Zoom 22 Zoom-In Shows 0.6 Hz Oscillation Small unit trip? Initially not a frequency event. Undamped oscillation clearly visible in frequency as well as angle Page 7 of 11 Conclusion Strong ERCOT-wide undamped oscillation, freq 0.6 Hz, lasting 20 seconds, then restarting after a pause. Most significant in South Texas, but visible everywhere. Cause unknown.

8 Event 8. Jan. 11, :59 GMT Good wind. Steady-state angle rises Slight steady-state angle rise No significant steady-state angle change. 12 No unit tripped Page 8 of 11 Conclusion line trip to West Texas

9 Event 9. Jan. 12, :49 GMT Good wind. Steady-state angle drops slightly Slight steady-state angle drop No significant change in steady-state angle. 12 Load shed? Conclusion possible load shedding Page 9 of 11

10 Event 10. Jan. 12, :24 GMT Poor wind. Steady-state angle drops slightly Steady-state angle drops slightly Steady-state angle rises slightly. 24 Unit trip. Conclusion Unit trip in North or West Texas Page 10 of 11

11 PMU Waveform Analyzer Display for Event 7 To run the program, unzip and place the hourly files and program in one folder. When you execute the program, Pick your hour Pick your minute (default is one minute, but you can also display two or more consecutive minutes Include the PMUs in these graphs we show McDonald, UT Pan Am, and Waco. Note the line below the graph Above graph saved as XXX. That file has the points, suitable for plotting in Excel. Top right buttons do auto screen. Presently, the program takes about 30 minutes to screen one day, flagging the events of interest in an output text file. Re-run the program (no auto-screen) to view those events and create the saved text files. Have fun. Page 11 of 11