SASKPOWER OPEN ACCESS TRANSMISSION TARIFF

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SASKPOWER OPEN ACCESS TRANSMISSION TARIFFAlso, during periods of high transmission system loading (particularly during off-peak loadconditions), critical clearing times for generators and generator rotor angle stability can alsobecome a concern.Simulation Study RequirementsThe ATC must be determined for each identified interface, based on appropriate reliabilityassessments. These transfer capability studies are done by the Transmission Provider, incoordination with other affected Transmission Providers.Since SaskPower’s transmission network is sparsely distributed over a large area with weak,interconnections to other transmission areas, full positive sequence AC powerflow and dynamicssimulations are required for adequate reliability assessments. All simulations will be conductedusing the PTI (Power Technologies Inc.) PSS/E software package, with all data provided incompatible format.Powerflow simulations shall be conducted over the full range of probable operating scenarioswithin the SaskPower system. For modeling systems external to SaskPower, MAPP loadflowcases will be utilized. The powerflows are tested to determine the level of transfer that results ina constraint limited by the study criteria.Dynamics simulations shall be conducted to confirm that the levels identified by the powerflowsimulations will also meet the study criteria for dynamic system performance.Page | 117
SASKPOWER OPEN ACCESS TRANSMISSION TARIFFStudies shall consider simultaneous transfers on interfaces and prior scheduled equipmentoutages.System Performance Criteria for Simulation StudiesThe study criteria consider thermal, stability, and voltage limits. The criteria are based onmeeting NERC Planning Standard IA with provision to phase out the Coteau Creek InitiatedLoadshed Scheme. SaskPower applies the performance criteria as follows:1. With normal steady state (pre-contingency) operating procedures in effect, all facilityloadings shall be within SaskPower normal equipment ratings and all transmission systemswitching station voltages shall be within SaskPower normal limits.2. Following contingencies, all facility loadings shall be within SaskPower emergencyequipment ratings and all transmission system switching station voltages shall be withinSaskPower post-contingency limits.3. Following contingencies, transient voltages at transmission system switching stationsshall meet the criteria defined in the MAPP Reliability Handbook.4. Following contingencies, generator dynamic power angle swing damping shall meet thecriteria defined in the MAPP Reliability Handbook.5. Following contingencies and after the operation of any automatic systems, alltransmission facility loadings shall be within SaskPower emergency ratings and allPage | 118
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SASKPOWER OPEN ACCESS TRANSMISSION TARIFF

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