TOPs/BAs adjust existing generation TOP and RC monitor for pre- and post-Contingency (or bring on expensive alternate exceedance of Facility Ratings, buts voltage limits, generation) to get under an SOL that and actual exceedance of stability limits. Action may be ultra-conservative and may taken only when actual system conditions indicate a not be reflective of actual system need for action. conditions. New Paradigm Solutions The proposed alternate paradigm was designed to take into account all existing and proposed NERC Standards, as well as the maturation of operational practices over the years. It acknowledges that tools have and will continue to change that allow TOPs to ensure reliability in more effective and efficient ways. In Phase II the team evaluated how the proposed alternative paradigm addressed the issues identified during the Phase I effort. It was determined that the proposed alternate paradigm addresses many of the issues that were identified with the current paradigm. In Phase III the team developed recommended solutions to address the identified issues. TTC-Calculation Currently the TTC for a path is generally calculated by the Path Operator. Under the new paradigm the Path Operator role is eliminated but the need for TOPs to calculate path TTC still remains. The calculation of Path TTC can be performed by a TOP (or designate) with the knowledge and ability to perform assessments, or it may be performed by a separate entity per appropriate agreements. Under the proposed Paradigm, TTCs are not real-time operating parameters; rather, SOLs are real-time operating parameters. That being said, the POTF recommendation does not preclude TOPs from using Path TTC for situational awareness, or even as a trigger point for operator action as part of an Operating Plan. Ensuring Acceptable System Performance Today, Path SOLs exist primarily to ensure acceptable pre- and post-Contingency system performance for the elements of the Path or elements impacted by Path flow. The RC SOL Methodology already requires acceptable pre- and post-Contingency performance for all elements of the BES, not just for WECC Paths. Moving away from the Path SOL paradigm allows TOPs the flexibility to achieve acceptable system performance by other more efficient means. Under the proposed paradigm, it is acceptable to determine stability limitations through offline studies and to use those stability limits in real-time operations. As with any other
TOPs/BAs adjust existing generation (or bring on expensive alternate generation) to get under an SOL that may be ultra-conservative and may not be reflective of actual system conditions. TOP and RC monitor for pre- and post-Contingency exceedance of Facility Ratings, buts voltage limits, and actual exceedance of stability limits. Action taken only when actual system conditions indicate a need for action. New Paradigm Solutions The proposed alternate paradigm was designed to take into account all existing and proposed NERC Standards, as well as the maturation of operational practices over the years. It acknowledges that tools have and will continue to change that allow TOPs to ensure reliability in more effective and efficient ways. In Phase II the team evaluated how the proposed alternative paradigm addressed the issues identified during the Phase I effort. It was determined that the proposed alternate paradigm addresses many of the issues that were identified with the current paradigm. In Phase III the team developed recommended solutions to address the identified issues. TTC-Calculation Currently the TTC for a path is generally calculated by the Path Operator. Under the new paradigm the Path Operator role is eliminated but the need for TOPs to calculate path TTC still remains. The calculation of Path TTC can be performed by a TOP (or designate) with the knowledge and ability to perform assessments, or it may be performed by a separate entity per appropriate agreements. Under the proposed Paradigm, TTCs are not real-time operating parameters; rather, SOLs are real-time operating parameters. That being said, the POTF recommendation does not preclude TOPs from using Path TTC for situational awareness, or even as a trigger point for operator action as part of an Operating Plan. Ensuring Acceptable System Performance Today, Path SOLs exist primarily to ensure acceptable pre- and post-Contingency system performance for the elements of the Path or elements impacted by Path flow. The RC SOL Methodology already requires acceptable pre- and post-Contingency performance for all elements of the BES, not just for WECC Paths. Moving away from the Path SOL paradigm allows TOPs the flexibility to achieve acceptable system performance by other more efficient means. Under the proposed paradigm, it is acceptable to determine stability limitations through offline studies and to use those stability limits in real-time operations. As with any other
POTF%20Whitepaper%20FINAL%20099514%20clean.docx