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SCED Penalty Factor

This document describes penalty factors, constraints, and violated scenarios related to power balance in the electricity grid. It includes details such as maximum shadow price, base case values, and specific violations during certain time periods.

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SCED Penalty Factor

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  1. SCED Penalty Factor Resmi Surendran

  2. Current Values • Maximum Shadow Price for Transmission Constraints • Base Case:  $5,000/MW • Generic constraints :  $5,000/MW • Post Contingency • 345 kV:  $4,500/MW • 138 kV:  $3,500/MW • 69 kV:  $2,800/MW

  3. Power Balance Penalty Curve • equivalent to having extra capacity for meeting power balance violation at • (+/-) 3001 $/MWh for violated MW from 0MW to 9999.999MW, and • (+/-) 5000$/MWh for violated MW from 10000MW to 99999.999MW

  4. Constraints 1-May - 28-May • 9 violated constraints - 616 intervals • 15 binding constraints - 415 intervals

  5. Violated Constraint 1 Contingency SSNDAUS5 overloading 345kV line 440_A @SNDSW 5/5/2010 5:15:28 PM High prices due to scarcity

  6. Violated Constraint 2 Contingency DGBY_GS8overloading 138kV GT_MID90@MID 5/26 3:45 pm High prices due to not having enough energy offer curves

  7. Violated Constraint 3 Contingency DGRSBNB5 overloading 1800@LENSW : 5/27 8:00 am

  8. LFC Test • Time period of full nodal control 11:55 – 12:25 • Two constraints binding/violated during test • DGBY_GS8 - Garrott-Midtown 138 kV, • X_BI58T2 - Bellaire 345/138kV Xfrmr

  9. SPP during LFC Test on May 20th • System was under full nodal control from 11:55 A.M. to 12:25 P.M. • Two constraints were binding/violated during test • Contingency loss of double circuit line from Green Bayou to Gable street and Hardy to Crocket overloading Garrott to Midtown 138 kV line • Contingency loss of one Bellaire 345/138kV Transformer overloading other Bellaire 345/138kV Transformer • Constraints were in Houston area causing price separation in Houston. • Negative prices were in non load buses causing the Houston Load Zone price to be nearly $40 higher than the Houston Hub price • For example for 5/20/2010 12:15 interval • Price ranged from $ 310.87 ( Resource Nodes @ WAP) to $ -104.18 (Resource Node @ BVE_CC1) • Houston Hub price was $-3.44 • Houston Load Zone price was $36.21

  10. Constraints during LFC test

  11. Need for Realistic Data • Not enough energy offer curve • Suspect or inconsistent telemetry Action plan • Submit EOC based on Zonal bids during the week of LFC testing. • Possible focused testing once a week.

  12. Questions ?

  13. West to North • Max SF = 0.14523 => Lambda – 4.61 • Min SF = -0.8077 => Lambda + 25.63

  14. West to North For settlement interval 5/24/2010 20:15 to 5/24/2010 20:30

  15. North to Houston • Max SF = 0.86985 => Lambda – 2.57 • Min SF = -0.08326 => Lambda – 0.25 • Only time period with only N-to-H • When also W-to-N, shadow prices are similar to W-to-N

  16. North to Houston For settlement interval 5/21/2010 10:15 to 5/21/2010 10:30

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