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1 Raymond R. Vojdani, P.E..  Background:  WECC (PWG) & OATI Have Been Working On This Issue For About a Year  The Goal Has Been to Streamline and Standardize.

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Presentation on theme: "1 Raymond R. Vojdani, P.E..  Background:  WECC (PWG) & OATI Have Been Working On This Issue For About a Year  The Goal Has Been to Streamline and Standardize."— Presentation transcript:

1 1 Raymond R. Vojdani, P.E.

2  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*** 2

3  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 3

4  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) 4

5  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 L 10 & 20% of BA’s Bias) 5

6  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) 6

7  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 7

8  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 8

9  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. 9

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20  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 Anitha Neve of WECC (anitha@wecc.biz) 20

21  That is it!!!  Any Questions ? 21


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