Transcript SA SRAS

SOUTH AUSTRALIA REGION RESTART
July 2013
PRESENTED BY PETER BIDDLE
SLIDE 1
AGENDA
1. The System Restart standard
2. What are the proposed changes
a)
b)
c)
d)
Main assumptions
Electrical sub-networks
Quantity of SRAS
SRAS Definition
3. Restart process
4. Questions
5. Summary
SLIDE 2
SYSTEM RESTART STANDARD
• Procure sufficient SRAS to achieve the following targets in
each electrical sub-network;
o Provide auxiliary supply to sufficient generation within 90 minutes
to provide generation & transmission capacity to meet 40% of
peak demand within 4 hours
• For South Australia peak demand = 3400 MW
• Need to supply 1360 MW capacity within 4 hours
• The restoration timeframe represents the target timeframe to
be used by AEMO in the procurement process. It is not a
specification of any operational requirement that should be
achieved in the event of a black system condition
SLIDE 3
WHAT ARE THE PROPOSED CHANGES
• Current assumption is that SRAS is procured to manage
a NEM wide shutdown
o This is an overly conservative assumption
o Changing to a Region only shutdown
• NEM wide shutdown requires each region to be selfsupporting for SRAS
o Region only shutdown allows use of adjoining regions as a
restart supply
• Currently one electrical sub-network in SA
o No change recommended
SLIDE 4
RECOMMENDED CHANGES (CONT.)
• Quantity of SRAS
o Recommending a minimum of 1 SRAS in each subnetwork
 Single SRAS for SA region
o Using supply from Victoria plus one SRAS still provides
two sources of restart supply
 The restart process from Victoria is documented in the AEMO
system restart plan for SA
SLIDE 5
RECOMMENDED CHANGES (CONT.)
• Current definitions of primary & secondary SRAS has led
to a number of perverse outcomes
o small gas turbines starting large thermal units at the same
power station that do not assist in AEMO meeting the
System Restart Standard because:
 No output to transmission network for several hours
 Do not assist in restarting other generating units
o Contracting with diesel units used to restart hydro and gas
turbine generating units
 Makes testing difficult and inefficient
SLIDE 6
RECOMMENDED CHANGES (CONT.)
• Recommending a single SRAS definition
• Objective is to ensure contracted services assist AEMO in
meeting the System Restart Standard
o ≥ 100MW delivered to the local transmission bus within 60
minutes.
 Availability/reliability ≥ 90%
 Could be delivered by
•
•
•
•
TTHL
Hydro
Gas Turbines
Other
o Testing would involve black starting the unit, connecting to the
power system and increasing output to contracted output within
the contracted timeframe.
• AEMO is currently consulting with a number of generators to
see if changes to this proposal are warranted.
SLIDE 7
RESTART PROCESS
• Under AEMO’s proposal SA will have two restart sources
o
o
From Victoria
SRAS
• A restart will normally start from both sources
concurrently.
o
A restart from Victoria is currently documented in AEMOs published system
restart plan for SA, so for this exercise we will assume that connection to Victoria
is not available and a restart will use an SRAS only.
• The aim is to provide auxiliary supply to the majority of
power stations within 90 minutes.
o
If this is done then the time to restore supply capacity is minimised but is then
outside AEMO’s control.

Load restoration determined by rate at which power stations can restore capacity
SLIDE 8
SOME ASSUMPTIONS
• No change from current process
o All generation & transmission equipment is available for service
o Generation capability is in accordance with Local Black System
Procedures as provided by Generators
o Reasonable time frames allowed for restoration of transmission
elements
o Load can be restored for voltage control
o Major generation
•
•
•
•
•
•
•
•
Torrens Island
Pelican Point
Quarantine
Osborne
Northern
Hallett
Mintaro
Dry Creek
o There are potentially a number of ways to do this
SLIDE 9
RESTORATION
• For the purpose of this exercise assume SRAS is supplied by
Dry Creek
• Part 1 – supply to Torrens Island area
• Start one Dry Creek unit and energise the 66KV bus at
Torrens Island via Kilburn
• Restore sufficient load ex Kilburn and TIPS 66KV bus to
stabilise the Dry Creek unit.
o Provides auxiliary supply to the Torrens Island and Quarantine
power stations
• Start the 4 small Quarantine and remaining Dry Creek units
• Restore load ex Kilburn and TIPS 66KV bus to stabilise units
• Restore Torrens Island to New Osborne and then to OCPL
o Provides connection/auxiliary supply to Osborne generation
SLIDE 10
RESTORE QPS – TIPS 66KV
SLIDE 11
RESTORATION
• Restore the Torrens Island 275KV bus from the TIPS
66KV bus (east bus is preferable)
• Restore the Torrens Island to Para line and start at least
one of the SVCs at Para (set point <= 280KV)
• Restore Torrens Island – LeFevre – Pelican Point –
PGWest – Para lines
o Provides connection/auxiliary supply to Pelican Point
• Supply to all Torrens Island area generation now
available and can be started as required/available.
SLIDE 12
RESTORE TORRENS ISLAND 275KV
NETWORK
SLIDE 13
RESTORATI0N
• Part 2a – Northern area generation
• Recommend both SVCs at Para in service prior to
proceeding (trip of an SVC during next steps may result
in an overvoltage situation)
• Restore Para to Robertstown
• Restore Robertstown to Davenport via Canowie
• Restore Playford 132KV bus
o Provides auxiliary supply for Northern power station
• Restore connection to Hallett power station (not the wind
farm) from Canowie.
SLIDE 14
RESTORATION
• Part 2b – restore connection to Angaston & Mintaro
• Can be done at the same time as part 2a
• Restore Para to Roseworthy, Temple, Dorrie and
Angaston
o Connection for Angaston power station
• Restore Temple to Waterloo and Mintaro
o Connection to Mintaro power station
SLIDE 15
PARA TO DAVENPORT & MINTARO
SLIDE 16
TIMING ESTIMATES TO MAKE AUXILIARY
SUPPLY AVAILABLE
• Elapsed time = 30 minutes
o
o
Quarantine
Dry Creek
• Elapsed time = 60 minutes
o
o
o
Osborne
Torrens Island
Pelican Point
• Elapsed time = 90 minutes
o
o
Mintaro
Angaston
• Elapsed time = 120 minutes
o
o
Northern
Hallett
SLIDE 17
AFTER 4 HOURS – LIKELY SUPPLY
CAPACITY
•
•
•
•
•
•
•
•
•
•
Dry Creek 135 MW
Quarantine 225 MW
Osborne 190 MW
Pelican Point 430 MW
Torrens Island 320 MW
Mintaro 100 MW
Angaston 50 MW
Hallett 180 MW
Northern 250 MW
Total = 1880MW (require 1360 MW to meet the SRS)
SLIDE 18
WIND FARMS
• In South Australia wind generation comprises a
significant portion of the total installed generation
capacity.
• Due to the unreliable nature of the output reconnecting
wind farms during the early stages of the restart is not
practical.
• Wind farms will not be reconnected until either
o An AC connection is restored to Victoria, or
o 40% of load has been restored
 Limited to 10% of on line generation
SLIDE 19
QUESTIONS
QUESTIONS
SLIDE 20
SUMMARY
•
•
•
•
•
Region only shutdown
Minimum of one SRAS to be procured
Revised SRAS definition
Still two sources of restart supply
Expect to be able to provide auxiliary supply/connection
to the majority of power stations within 90 minutes.
• Rate of load restoration will depend on rate of
generation restoration and is outside AEMO’s control.
SLIDE 21