Presentation on theme: "CSC/CRE Technical Review 6 October 2008. 2 Outline Review the process used in calculating Power Transfer Distribution Factors (PTDFs). Information."— Presentation transcript:
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 http://www.ercot.com/calendar/2008/10/20081008-TACWMS CRE recommendations distributed on October 3 rd.
3 6 October 2008 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.pdfhttp://www.pserc.org/cgi-pserc/getbig/publicatio/2001public/tcc_tutorialjuly01.pdf
4 6 October 2008 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 6 October 2008 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 6 October 2008 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 6 October 2008 Who’s on first? 1)This column states whether the CRE was a 2008 CRE. 2)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. 3)Denotes which CSC scenario a particular CRE is recommended for; “x” marks the spot. 1 2 3
8 6 October 2008 Average Weighted Shift Factor Scenario 3b AWSF Table ZoneW-NS-NN-SN-HN-W North0.0082780.01443-0.014430.008156-0.00828 South0.023950.384565-0.38456-0.22998-0.02395 West0.3751490.024752-0.02475-0.02098-0.37515 Houston0.0139440.244188-0.24419-0.33006-0.01394 Scenario 3h & i AWSF Table ZoneW-NS-NN-SN-HN-W North0.0060290.014347-0.014350.007204-0.00603 South0.0296190.384565-0.38456-0.22998-0.02962 West0.383520.028084-0.02808-0.02294-0.38352 Houston0.0184890.244188-0.24419-0.33006-0.01849