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System Load Calculation for AEP-Texas

System Load Calculation for AEP-Texas. AEIC Annual Load Research Conference Reno, Nevada September 10-13, 2006. Kirk Schneider American Electric Power Tulsa, Oklahoma. Introduction. What We Did Why We Did It How We Did It What We Found So What?.

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System Load Calculation for AEP-Texas

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  1. System Load Calculation for AEP-Texas AEIC Annual Load Research Conference Reno, Nevada September 10-13, 2006 Kirk Schneider American Electric Power Tulsa, Oklahoma

  2. Introduction • What We Did • Why We Did It • How We Did It • What We Found • So What?

  3. The American Electric Power System

  4. What We Did • ERCOT became single Control Area 7/31/01 • Companies stopped checking tie lines. • Installed IDRs on a Number of Tie-Lines • Verified IDR Data for generation and tie-lines • Rate filing for TCC and TNC later this year. • Update loss studies. • Update demand studies

  5. What is System Load? • Total power consumption on system • Measure Power Received from Generators • Measure Power Flow at Interconnect Points • Can directly measure load, but not losses

  6. “Top-Down” System Load Calculation Generation: 300 + 200 Interchange: -10 -20 +40 -------- Net Load: 510 MW

  7. “Bottom-Up” Load Calculation Load: RES 190 COM + 100 IND + 60 WHL + 140 Losses: + 30 ------------------ Load: 520 MW UFE: - 10 MW

  8. Power Consumption in North American Grid • No Boundary Metering • Power is consumed the instant it is generated • Power Consumed = Power Generated • Power Consumed = Power used + power “lost”

  9. ERCOT Transmission System

  10. ERCOT System Load • Connected to grid with 3 DC ties • System Load = generation + power imported over DC ties – power exported over DC ties • SYSTEM LOAD = GENERATION – NET INTERCHANGE • EPS Meters on Generation and DC Ties

  11. AEP-Texas System Load • Texas Central Co. (South Texas) • Texas North Co. (West Texas) • TCC ~ 30 Gens, 50 Interconnects • TNC ~ 20 Gens, 40 Interconnects

  12. Texas Central Transmission System

  13. Texas North Transmission System

  14. Why AEP Needs System Load • Demand Studies • Σ Sales * Loss Factor = Estimated System Load • Loss Studies • Losses = System Load – ΣSales • Transmission Settlements • Unbilled Sales • Checks and Balances • All Assume System Load is Correct

  15. How did We Implement AEP-Texas Tie-Line Metering? • About 12 complete – meter and CT / PTs • About 24 meter only using existing CT / PTs • Accuracy of Meters • Leveraging Existing Metering In South Texas

  16. TCC Ties to South Texas EC

  17. How Are We Collecting and Analyzing the Data? • Collecting Data Using MV-90 System • Data Validation • Analyzing Data Using SAS • Sent to CEAS System

  18. PROBLEMS! • Gaps in IDR Data • Suspicious Looking Data • Missing Meters • Problems Getting Data from ERCOT

  19. SCADA to the Rescue! • PI Database Installed Oct 2004 • Analog Measurements • Accessible with ODBC or OLE • SAS Table Containing SCADA Data

  20. Data Validation • Use SCADA Data to Validate IDR Data • SCADA Strengths Complement IDR Data • Use SCADA Data to Fill IDR Data Gaps • Examples

  21. Everything’s All Right – Generator 1

  22. Everything’s All Right – Generator 2

  23. Everything’s All Right – Tie 1

  24. Everything’s All Right – Tie 2

  25. Good Enough – SCADA at opposite end of line

  26. Better than Nothing – SCADA at opposite end, load along line

  27. Load Outside Boundary of Meters

  28. Gap In IDR Data - Generator

  29. Gap in IDR Data - Line

  30. SCADA Goes “Flat-Line” for Short Period – Gen

  31. SCADA Goes “Flat-Line” for Short Period – Line 1

  32. SCADA Goes “Flat-Line” forShort Period – Line 2

  33. SCADA Goes “Flat-Line” for Short Period – Line 3

  34. SCADA Goes “Flat-Line” for Long Period – Line 1

  35. SCADA Goes “Flat-Line” for Long Period – Line 2

  36. SCADA Goes “Flat-Line” – Long Period - Gen

  37. SCADA Resolution Problem – Small Line

  38. SCADA Resolution Problem – Line

  39. Time-Synch or Resolution??

  40. No SCADA Available – Wholesale POD’s

  41. General SCADA Failure – Example 1 Gen

  42. General SCADA Failure – Example 2 Gen

  43. General SCADA Failure – Example 3 Line

  44. General SCADA Failure – Example 4

  45. General SCADA Failure – Example 5 Line

  46. Suspicious Generator Data

  47. Impact on System Load Calc

  48. Meter Configuration

  49. Using Alternate SCADA Points

  50. IDR Data vs. SCADA • IDR Strengths • True integrated values • Distributed data collection • Lower cost than SCADA • SCADA Strengths • Time synch extremely accurate • Data available real-time • Multiple backup measurements • Together Provide Very Reliable, Accurate Data

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