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CSC/CRE Technical Review

CSC/CRE Technical Review. 6 October 2008. Outline. Review the process used in calculating Power Transfer Distribution Factors (PTDFs). Information posted at: http://www.ercot.com/calendar/2008/10/20081008-TACWMS CRE recommendations distributed on October 3 rd. PTDF vs. GSF.

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CSC/CRE Technical Review

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  1. CSC/CRE Technical Review 6 October 2008

  2. Outline • Review the process used in calculating Power Transfer Distribution Factors (PTDFs). • Information posted at: http://www.ercot.com/calendar/2008/10/20081008-TACWMS • CRE recommendations distributed on October 3rd.

  3. PTDF vs. GSF • Power Transfer Distribution Factors (PTDFs) represent the percent of power transfer that flows on a transmission facility. PTDFs are used to estimate the change in flows that occur from a particular transfer and identifying which elements are impacted by the transfer. • Generator Shift Factors (GSFs) represent the change in flow on an element as a result of increasing generation at a node. GSFs are more useful in identifying the generator pairs that can impact a specific element. • Both PTDF and GSFs can be calculated using similar assumptions. • Source: http://www.pserc.org/cgi-pserc/getbig/publicatio/2001public/tcc_tutorialjuly01.pdf

  4. PTDF process For each of the CSC Scenarios 3b, 3i, and 3h - • ERCOT coordinated Market Participant resources to assist in the calculation of PTDFs for each scenario • PowerWorld and Excel were used as the tools to calculate PTDFs for base case and contingencies of CSCs and CREs. • For the Base Case and each pair of contingency-monitored elements, the 3 plants with highest of GSFs for both directions were identified to review whether local solutions were feasible.

  5. PTDF Calculation Assumptions • Oklaunion movable and located in the West zone under Scenario 3i and 3b but not movable and located in the North zone under Scenario 3h. • Pmax available to resolve constraint for all unit movable units in each zone

  6. ERCOT’s CRE recommendations • ERCOT based it’s CRE recommendations on the results generated by the test outlined in Protocols Section 7.2.3 • ERCOT is also permitted by the Protocols to select CREs that can provide improved operational control. • In determining whether a CRE provides improved operational control ERCOT reviewed the PTDF results and the location of the CRE.

  7. Who’s on first? 2 3 • This column states whether the CRE was a 2008 CRE. • Explains the criteria used for recommending the line as a CRE; if a CRE only passed for a specific scenario, the scenario is provided in parenthesis. • Denotes which CSC scenario a particular CRE is recommended for; “x” marks the spot. 1

  8. Average Weighted Shift Factor

  9. Questions ???

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