Transcript QLD SRAS-FINAL

SRAS REVIEW
QUEENSLAND REGION
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
a) North
b) South
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 QLD South peak demand = 5100MW
o Need to supply 2040MW capacity within 4 hours
• For QLD North peak demand = 3400
o 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
RECOMMENDED CHANGES
• Current assumption is that SRAS is procured to manage
a NEM wide shutdown
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 three electrical sub-networks in Queensland
o QLD North, QLD Central & QLD South
SLIDE 4
RECOMMENDED CHANGES (CONT.)
• Recommending a combination of the central & north subnetworks
 Connections between these areas recently strengthened
• Now 3 275KV lines from Nebo to Ross + 132KV connections
• Now 4 275KV lines between Nebo and Broadsound/Bouldercomb
+ 132KV connections
• 3 275KV lines between Calvale & Stanwell + 132KV connections
and 2 additional 275KV lines in Nov 2013
• Currently 6 SRAS in Queensland – 2 x south, 3 x central
& 1 x north
o Proposing a minimum of 1 SRAS in each sub-network
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 Queensland will have a
minimum of three restart sources
o
o
o
From NSW
At least 1 SRAS in south
At least 1 SRAS in north
• A restart will normally start from all three sources
concurrently.
o
For the purpose of this exercise we will assume a restart from NSW is not
available so restart will be managed from the 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 may be restored for voltage control
o Major generation
 North – Callide, Stanwell, Gladstone, Townsville GTs
 South – Tarong, Kogan, Millmerran, Wivenhoe, Swanbank,
Braemar, Darling Downs, Oakey.
o There are potentially a number of ways to do this
SLIDE 9
RESTORATION - NORTH
•
•
Assume SRAS is Stanwell – TTHL service
Energise Stanwell to Calvale and restore 132Kv bus
o Restore load at Biloela and/or Moura and auxiliary supply to Callide
power stations
•
Energise Stanwell to Bouldercombe then Callipoe River and restore
132KV bus
o Restore load at Gladstone North and auxiliary supply to Gladstone
o Restore auxiliary supply to Boyne Island (Sensitive load)
•
Energise Bouldercombe to Nebo and start SVC.
o Restore load at Mackay and start GT
•
•
•
Energise Nebo to Strathmore and start SVC
Energise Strathmore to Ross and start SVC and energise 132KV
bus
Energise 132Kv line to Townsville South and to Mount Stuart
o Start GTs at Mount Stuart.
SLIDE 10
STANWELL TO CALVALE & CALLIOPE
RIVER
SLIDE 11
BOULDERCOMBE TO STRATHMORE
SLIDE 12
STRATHMORE TO ROSS TO CHALUMBIN
SLIDE 13
TIMING ESTIMATES TO MAKE AUXILIARY
SUPPLY AVAILABLE
• Elapsed time = 30 minutes
o
o
Stanwell 1400MW
Callide 1500MW
• Elapsed time = 60 minutes
o
Gladstone 1600MW
• Elapsed time = 90 minutes
o
o
Mackay 30 MW
Mt Stuart 400MW
• Elapsed time = 120 minutes
o
o
Townsville 245MW
Kareeya 80MW
SLIDE 14
AFTER 4 HOURS – LIKELY SUPPLY
CAPACITY
•
•
•
•
•
•
•
•
•
•
Stanwell 700 MW
Callide B 700 MW
Callide C 800 MW
Gladstone 560 MW
Mackay 30 MW
Mt Stuart 400 MW
Townsville 285 MW
Kareeya 80 MW
Barron Gorge 60 MW
Total = 3615MW (1360MW required to meet SRS)
SLIDE 15
RESTORATION - SOUTH
•
•
Assume SRAS is Wivenhoe
Energise Tarong and restore 66KV bus
o
o
o
o
•
•
•
•
•
Energise 132KV system to Chinchilla & Columbula
Restore load at Tarong plus Tarong auxiliary supply
Restore load at Chinchilla
Auxiliary supply to Roma and Condamine
Energise Mt England to Blackwall and start SVC
Energise Blackwall to Greenbank and start SVC
Energise Greenbank to Swanbank E
Energise Greenbank to Belmont and restore load
Energise Tarong to Braemar and start SVC
o Supply restored to Braemar & Darling Downs power stations
SLIDE 16
RESTORATION - SOUTH
•
•
•
Start second Wivenhoe unit
Energise Tarong to Blackwall
Energise Tarong to Middle Ridge and through to Oakey GTs
o Auxiliary supply to Oakey GTs
•
•
Energise Braemar to Western Downs
Energise Kogan
o Auxiliary supply to Kogan
•
Energise Braemar to Bulli Creek and Millmerran
o Auxiliary supply to Millmerran
SLIDE 17
WIVENHOE TO TARONG & BRAEMAR
SLIDE 18
TARONG TO MIDDLE RIDGE
SLIDE 19
BRAEMAR TO WESTERN DOWNS & BULLI
CREEK
SLIDE 20
TIMING ESTIMATES TO MAKE AUXILIARY
SUPPLY AVAILABLE
• Elapsed time = 30 minutes
o
o
o
o
Wivenhoe 500 MW
Tarong 1800MW
Roma 80 MW
Condamine 140 MW
• Elapsed time = 60 minutes
o
o
Swanbank E 400 MW
Braemar & Darling Downs 1500MW
• Elapsed time = 90 minutes
o
o
o
Kogan 740 MW
Milmerran 880 MW
Oakey 340 MW
SLIDE 21
AFTER 4 HOURS – LIKELY SUPPLY
CAPACITY
•
•
•
•
•
•
•
•
•
•
•
Tarong 0 MW
Tarong North 0 MW
Swanbank E 400 MW
Roma & Condamine 220 MW
Wivenhoe 500 MW
Braemar 1000 MW
Darling Downs 500 MW
Kogan 740 MW
Milmerran 0 MW
Oakey 340 MW
Total = 3700MW (2040MW required to meet SRS)
SLIDE 22
QUESTIONS
QUESTIONS
SLIDE 23
SUMMARY
•
•
•
•
•
Region only shutdown
Move to two electrical sub-networks
Minimum of one SRAS to be procured per sub-network
Still three sources of restart supply
Expect to be able to provide auxiliary supply/connection
to all major generation within 90 minutes.
• Rate of load restoration will depend on rate of
generation restoration and is outside AEMO’s control.
SLIDE 24