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Enhancing Transient Stability Analysis with PowerWorld Simulator: A Comprehensive Overview

This document by Tracy Rolstad from Avista System Planning outlines effective techniques for transient stability analysis using PowerWorld Simulator (PWS). It covers the required submissions to WECC, methods for auto-inserting stability elements, and utilizing Excel for data management. Key processes include comparisons using PlayIn for validation, proper formatting of data for transient stability forms, and troubleshooting timing issues. The focus is on achieving accurate numerical results and the integration of alternative software for verification, ensuring reliability in power system assessments.

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Enhancing Transient Stability Analysis with PowerWorld Simulator: A Comprehensive Overview

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  1. Introduction • Tracy Rolstad • Avista System Planning • BSEE, Idaho, 1992 • Graduate Diploma, Naval War College, 1999 • Chair of WECC PowerWorld User’s Group • Contact Information • 509 495 4538 • tracy.rolstad@avistacorp.com

  2. Transient Stability In PWS This is a PCC & WECC approved statement • YOU ARE FREE TO USE PWS!!!!!!!!!!!! • WECC has NO opinion on study software • WECC does require *.epc and *.dyd submissions • For now…the BCCS alters this • Things you should know about PWS TS • How to “auto insert” stability elements • From Power flow ctg tool • Excel and Custom String Expressions • How to compare results • PlayIn • Recently modified to accept unmodified GE PSDS output

  3. Adding TS Events From PF CTG • Auto-Insert in ctg analysis • N-1 Lines (Not Branches) • Bus Outages (think FERC 754) • Cut and Paste two to three times • Two paste for bus outages • Three paste for line outages

  4. Set up Owner Filter

  5. Auto Insert Lines by Owner

  6. Switch to Element View

  7. Contingency Element View

  8. Where we want to land • We will need to make the power flow ctg descriptions fit the transient stability form. • Use the display/column right click, add columns • Use the Custom String Expression to concatenate to the TS form • Cut and paste three times or so

  9. Columns to Add

  10. Custom String Expression Remember, we want the form of: Branch '48524' '48357' '1'

  11. The Custom String Expression "Branch '" + str(x1, 0, 0) + "''" + str(x2, 0, 0) + "''" + x3 + "'" The above gives us: Branch '48524' '48357' '1' Yay! Now we can talk Transient Stability lingo

  12. Cutting and Pasting

  13. Pasting Here (three times)

  14. First Paste (Fault On)

  15. Refresh (Definitions)

  16. Second Paste (Open Near)

  17. Third Paste (Open Far)

  18. Pasting Results In This Results: Knocked out 277 faults at 10% on From/Near End in 2 minutes. Yay! The power of Object Orientated coding. Cut and paste is inherited and works in Transient Stability

  19. Alter Process/Results As Needed • Suggestions • Sort out breaker timing with knowledge and filters • Cut and paste by breaker speed from PWS/Excel • Clean up timing in Excel • Clean up timing in PWS • All of the above is your call • Bottom line • Cutting and pasting provides auto-insert like ability • You should be doing this once presumably

  20. Comparison Using PlayIN • Question is: • Is PowerWorld Simulator “Right” • Right = Correct NUMERICAL results • As compared to what? • Ground truth = VALIDATION • Another program = VERIFICATION • Verification • Transient Stability • We can compare the numerical results • PlayIn

  21. We Need Something To Play In

  22. Query GE PSDS By Bus #

  23. Right Click GE To Save

  24. Excel: Open File, Save As *.csv • Open file in Excel and save it as a *.csv file • Inspection and proper formatting occur

  25. After Saving As *.csv Notepad + + = Yay!

  26. Read In *.csv As PlayIn

  27. PlayIn Main Dialog

  28. PlayIn Signals Dialog (The Data)

  29. Plotting a PlayIn

  30. Play With Colors To Compare

  31. Adjust Plots For Comparison

  32. Scale, Decimal Points, Gridline

  33. Compare Voltage

  34. Compare Frequency Note ATR effects on frequency

  35. Single Palo Verde Compare (f)

  36. Zoomed In Single PV (f)

  37. Double Palo Verde Compare (f)

  38. Double Palo Verde Compare (v)

  39. Zoomed In Double PV (v)

  40. Triple Palo Verde Compare (f)

  41. Triple Palo Verde Compare (v)

  42. Zoomed In Triple PV (v)

  43. Set GE for 1 & 1

  44. GE vs PWS Assessment • Adequate for Production • Small Differences WILL Matter • 0.86 vs 0.87 separates Alberta via TLIN1 • Comparison Benefits GE and PWC • Both software packages are improved • Thought required to test on the “same ground”

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