Download power operations update

Western Area Power
Administration
Transmission Customer Meeting
October 17, 2007
Western Area Power
Administration
AGENDA:
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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
Western Area Power Administration
Physics of Disturbances
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Area A
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Generation
-Load
-Losses
Export
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Area A
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Export
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Thermal Overloads
Voltage Limits
System Stability
 Transient Voltages
 Frequency Limits
 Damping
VARs and Voltage Stability
Remedial Action Schemes
System Synergy
Islanding
Cascading
Western Area Power
Administration
Transfer Capability Limit Criteria
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Total Transfer Capability (TTC)
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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
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No element shall be scheduled above it’s continuous operating
limits
Western Area Power
Administration
Transfer Capability Limit Criteria Cont’d
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Stability Following an Outage
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N-1s shall not cause cascading
System Response to Contingencies Prior to
Readjustment (Transient period)
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Voltages and element loading shall meet the WECC/NERC
corresponding criteria, loading shall not exceed emergency
ratings
Available Transfer Capability (ATC) – OATT
& Mandatory Reliability Requirements
Western Area Power
Administration
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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.
Western Area Power
Administration
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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.
Western Area Power
Administration
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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/
Western Area Power
Administration
Questions/Discussion