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WIT Computation of Primary Inadvertent Interchange (ATEC)

WIT Computation of Primary Inadvertent Interchange (ATEC). Raymond R. Vojdani , P.E. WIT Computation of ATEC. Background: WECC (PWG) & OATI Have Been Working On This Issue For About a Year

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WIT Computation of Primary Inadvertent Interchange (ATEC)

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  1. WIT Computation of Primary Inadvertent Interchange (ATEC) Raymond R. Vojdani, P.E.

  2. WIT Computation of ATEC • Background: • WECC (PWG) & OATI Have Been Working On This Issue For About a Year • The Goal Has Been to Streamline and Standardize Computation of Primary Inadvertent Interchange (PII) Among All Balancing Authorities • The Modification to WIT Has Been Completed for Selected Three BAs (to validate the calculations) • WECC PWG Is Working With OATI to Re-compute Accumulated PII (on-peak & off-peak) for all BAs starting from July 2009***

  3. WIT Computation of ATEC • Highlights of Computation • Using Data in WIT (Schedules and Actuals), Uploaded Data from BAs (BA Bias, L max,) and some Constants (epsilon 10, and H ) and Data Provided by WECC Reliability Coordinator, Who is the WECC Time Monitor (Delta Time Error) WIT Computes PII As Specified in Regional Standard BAL-004-WECC-01

  4. WIT Computation of ATEC • Computation Cycle • WIT Calculates PII 50 Minutes Past the hour using last hour Inadvertent Interchange and last hour Delta Time Error • The PII gets added to the Accumulated PII on-peak or Accumulated PII off-peak as appropriate • Using BA’s Bias and BA’s L 10 , WIT Computes a Recommended Payback Value • Any change to schedule, or tie data will trigger a re-computation of PII from that hour beyond (Also DTE and change by WECC Admin)

  5. WIT Computation of ATEC • Data Provided by BAs: • Bias • BA’s with fixed Bias can use the API to enter their Bias Values • BA’s with variable Bias can upload their hourly Bias value to WIT using EIDE protocol • L max • The value (upper & lower limit) which a BA can select for desired payback of Accumulated PII • (bounded by BA’s L10 & 20% of BA’s Bias)

  6. WIT Computation of ATEC • Constants Used In the Program: • WECC Bias Value (provided by WECC Admin, currently 1999 MW/0.1Hz) • Epsilon 10 (provided by NERC, currently 6.5 mHz) • H (provided by PWG, currently 3)

  7. WIT Computation of ATEC • Data Provided by WECC RC • Delta Time Error (DTE) • RC calculates DTE based on formula specified in the Regional standard and sends the value to WIT using EIDE • In addition, RC transmits calculated DTE value to all BAs in the WECC using ICCP • Backup DTE values are provided by two other BAs • Backup (1) is provided to assure communication security of DTE value, Backup (2) to verify calculation of DTE by RC

  8. WIT Computation of ATEC • What Data Will Be Available to BAs • Primary Inadvertent • Accumulated Primary Inadvertent On-Peak • Accumulated Primary Inadvertent Off-Peak • Recommended Payback Value • Those who have OATI’s Scheduling Software, the ATEC term can be added to their NSI • These Data Can Be Transferred to BAs Using EIDE Protocol

  9. WIT Computation of ATEC • Demo of PII Calculation • Next Step: • PII Computation is being tested by 3 BAs (AVA, AZPS, and WACM) • Once all calculations are verified, the computation will be applied for all BAs (Nov. 1, 2010 H.E. • All BAs PII will be recomputed going back to July 1, 2009. • PWG will communicate with all WECC BAs with its expectation for using WIT computation of PII.

  10. WIT Computation of ATEC • Issue Reporting: • BAs who are currently using OATI’s webtrans software for their back-end OASIS, they have access to OATI Problem Reporting. • https://problem.reporting.oatiinc.com • Issues regarding PII computation should be reported under WIT Project. • BAs who are don’t have access to OATI’s Problem Reporting can call OATI’s helpdesk and report the problem (763 201 2020) • In addition, issues can be sent to AnithaNeve of WECC (anitha@wecc.biz)

  11. WIT Computation of ATEC • That is it!!! • Any Questions ?

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