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NERC's Long-Term Solution for Flow Limited Paths – MOD-029 Update August 2011

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6 diapositives · 192 Views · Aug 13, 2014

In August 2011, updates were discussed regarding the issues surrounding "Flow Limited Paths." A short-term fix was established with a NERC Enforcement-issued waiver, allowing these paths to be rated per past practices. However, a long-term solution is being initiated through a Standard Authorization Request (SAR). Coordination for this solution involves a group comprising Columbia Grid, Northern Tier, WestConnect, and CAISO, who are working on an Issues Paper and draft SAR. Stakeholder collaboration is emphasized to ensure reliability and address the path constraints without introducing new issues.

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NERC's Long-Term Solution for Flow Limited Paths – MOD-029 Update August 2011
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  1. MOD-001 Update for TSS August 2011 Tom Duane

  2. MOD-029 Modification Required • Problem with “Flow Limited Paths” discussed at previous TSS meetings and recent update provided at July Joint MIC, OC, PCC Meeting. • Short Term Fix: NERC Enforcement issued Waiver which allowed “Flow Limited Paths” to continue being rated based on practices of the past. This is not applicable for “Reliability Limited” paths. • Long Term Fix: NERC envisions a permanent solution via a SAR (Standard Authorization Request)

  3. Current and Near Term Activities • Steps towards long-term fix being coordinated by Joint Initiatives Group (Columbia Grid, Northern Tier, WestConnect) and CAISO by developing an Issue Paper and draft SAR Document. • Smaller group doing majority of work on drafting the Issues Paper. • Once discussion draft is complete, solicit input from a broader stakeholder collaborative including eastern entities using MOD-029. • Keep NERC and WECC informed of activities and progress.

  4. Issue Paper Topics • Problem Statement • Demonstration of current MOD-029 short comings. • Proposed solutions • Demonstrate that proposed changes: • Do not degrade reliability • Solve the problem • Do not create new problems

  5. Proposed Solution • Modify to address contract or scheduled paths that cannot be stressed to a reliability limit. • Studies to show that a schedule is accommodated without causing reliability problems. • Methodology will allow schedules to be studied in a manner similar to analysis of proposed new resource injections up to the lower of where a reliability limit is found or a path SOL (likely thermal limit) is exceeded. • Various details to be worked out. • Also see July Joint MIC, OC, PCC MOD-029 Presentation

  6. Next Steps • Next small group meeting to continue drafting Issues Paper on Friday August 26 – will be used for discussions with all stakeholders participating in larger Joint Initiatives group. • Complete and distribute draft white paper for input from other affected/interested stakeholders. Will require some outreach to eastern entities. • Work with Stakeholders, WECC and NERC to define timeline and process steps for a SAR. • Ultimately develop a SAR and begin NERC process.