Western Area Power Administration

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Western Area Power Administration

• Transmission Customer Meeting
• October 17, 2007

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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

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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

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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 its
  continuous operating limits

5
Western Area Power Administration
Transfer Capability Limit Criteria Contd

• 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

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Available Transfer Capability (ATC) OATT
Mandatory Reliability Requirements
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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_mast
  ercopy_(11_05).pdf
• Rates http//www.wapa.gov/sn/marketing/rates/

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Western Area Power Administration

• Questions/Discussion