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Western Area Power Administration

Western Area Power Administration. Transmission Customer Meeting October 17, 2007. Western Area Power Administration. AGENDA: POWER OPERATIONS UPDATE General Update 890 Filing Darren Buck, Power Operations Manager ATC Calculations Mariam Mirzadeh, Transmission Planning Engr.

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Western Area Power Administration

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  1. Western Area Power Administration Transmission Customer Meeting October 17, 2007

  2. Western Area Power Administration AGENDA: • POWER OPERATIONS UPDATE • General Update • 890 Filing Darren Buck, Power Operations Manager • ATC Calculations Mariam Mirzadeh, Transmission Planning Engr. • Rates Update Sean Sanderson, Rates Manager

  3. Area A Generation -Load -Losses Export Area A Export Western Area Power Administration Physics of Disturbances • Thermal Overloads • Voltage Limits • System Stability • Transient Voltages • Frequency Limits • Damping • VARs and Voltage Stability • Remedial Action Schemes • System Synergy • Islanding • Cascading

  4. Western Area Power Administration Transfer Capability Limit Criteria • Total Transfer Capability (TTC) • Maximum amount of power that can be transferred across an interconnection or a transfer path from one control area to another or within an area while ensuring that the transmission system is able to suffer and recover from a severe outage (meeting the NERC/WECC reliability criteria). • Net schedules shall not exceed TTC • TTC & ATC are directional • Operating Limits • No element shall be scheduled above it’s continuous operating limits

  5. Western Area Power Administration Transfer Capability Limit Criteria Cont’d • Stability Following an Outage • N-1s shall not cause cascading • System Response to Contingencies Prior to Readjustment (Transient period) • Voltages and element loading shall meet the WECC/NERC corresponding criteria, loading shall not exceed emergency ratings

  6. Available Transfer Capability (ATC) – OATT & Mandatory Reliability Requirements

  7. Western Area Power Administration • ATC = TTC (allocated to Western) – Committed Uses • Where Committed Uses = Existing Transmission Commitments + Transmission Reliability Margin (TRM) + Capacity Benefit Margin (CBM) • TRM Includes: Unscheduled Flow (Loop Flow) Accommodation for any simultaneous limitations associated with operation under a nomogram & Uncertainty in load forecasting – regulation, etc.

  8. Western Area Power Administration • CBM Includes: Capacity for movement of water in order to meet Bureau of Reclamation/Corp of Engineers water schedules, or for moving generation under black starts conditions. • All transmission (PACI, COTP, network and P-P) reservations are subject to real-time operation operating limitations especially the Sacramento area simultaneous import Nomogram.

  9. Western Area Power Administration • CVP Network transmission ATC calculation methodology, SNR business practice # 20: https://www.westtrans.net/WASN/WASNdocs/CVP_Trans_BP-20_V_01_10-15-07.pdf OATT: http://www.oatioasis.com/WASN/WASNdocs/tariff_mastercopy_(11_05).pdf Rates:http://www.wapa.gov/sn/marketing/rates/

  10. Western Area Power Administration Questions/Discussion

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