Transcript NSW SRAS-Presented

SRAS REVIEW
NEW SOUTH WALES 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 NSW South peak demand = 11,000MW
o Need to supply 4400MW capacity within 4 hours
• For NSW North peak demand = 3700
o Need to supply 1480 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 two electrical sub-networks in NSW
o NSW North & NSW South
o No change to electrical sub-networks
• Currently 5 SRAS in NSW – 2 x south, 3 x north
o Proposing a minimum of 1 SRAS in each sub-network
SLIDE 4
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
 Does 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 5
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 6
RESTART PROCESS
• Under AEMO’s proposal NSW will have a minimum of
four restart sources
o
o
o
o
From Queensland
From Victoria
At least 1 SRAS in south
At least 1 SRAS in north
• A restart would normally start from all four sources
concurrently.
o
For the purpose of this exercise we will look at two scenarios


Connection to Queensland not available – restart NSW north from SRAS only
SRAS not available – restart NSW north from Queensland 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 7
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 – Bayswater, Liddell. Eraring, Vales Point, Colongra
 South – Mt Piper, W’wang, Snowy, Uranquinty, Tallawarra.
o There are potentially a number of ways to do this
SLIDE 8
RESTORATION – NORTH
FROM QUEENSLAND
• Energise Bulli Creek to Dumaresq to Armidale – all
reactors in service
• Restore 132KV bus at Armidale and restore load
• Start SVC at Armidale
• Energise 85 line to Tamworth, restore 132KV bus and
restore load.
• Energise 84 line to Liddell
o Auxiliary supply for Liddell and Bayswater (33 or 34 line to
Bayswater can also be restored if required)
SLIDE 9
BULLI CREEK TO LIDDELL
SLIDE 10
RESTORATION – NORTH
FROM QUEENSLAND
•
•
•
•
•
•
Energise from Armidale to Coffs Harbour, 87 line and then on to
Lismore, 89 line.
Restore load at Coffs Harbour and start SVC at Lismore
Reduce voltage levels at Lismore (315KV and Armidale 340KV)
Energise Newcastle from Liddell, 81 line.
Restore 132KV bus and load at Newcastle
Energise 132KV 95A, 95G and 9F3 lines to Eraring
o Auxiliary supply to Eraring
•
•
•
Energise 95 line to Tomago and restore auxiliary supply.
Energise 90 line to Eraring
Energise 24 Line to Vales Point
o Auxiliary supply to Vales Point
•
Energise 23 line to Munmorah
o Auxiliary supply to Colongra
SLIDE 11
LIDDELL TO COLONGRA
SLIDE 12
TIMING ESTIMATES TO MAKE AUXILIARY
SUPPLY AVAILABLE
• Elapsed time = 60 minutes
o
o
Bayswater 2640 MW
Liddell 2000 MW
• Elapsed time = 90 minutes
o
Eraring 2820 MW
• Elapsed time = 120 minutes
o
o
Vales Point 1320 MW
Colongra 720 MW
SLIDE 13
AFTER 4 HOURS – LIKELY SUPPLY
CAPACITY
•
•
•
•
•
•
Colongra 720 MW
Vales Point 660 MW
Eraring 1400 MW
Bayswater 0 MW
Liddell 500 MW
Total = 3280 MW (1480 MW required to meet SRS)
SLIDE 14
RESTORATION - SOUTH
•
•
•
No change to current documented procedures
Starting from Victoria or Snowy SRAS (Tumut/Murray) is essentially
the same process.
Expected timing to make auxiliary supply available
o Elapsed time = 30 minutes


Tumut 2400 MW
Murray 1500 MW
o Elapsed time = 60 minutes

Shoalhaven 240 MW
o Elapsed time = 90 minutes


o
Uranquinty 660MW
Tallawarra 460 MW
Elapsed time = 110 minutes


Mt Piper 1400 MW
W’wang 1000 MW
SLIDE 15
AFTER 4 HOURS – LIKELY SUPPLY
CAPACITY
•
•
•
•
•
•
•
Snowy 2500 MW (limited by transmission capacity)
Uranquinty 660 MW
Tallawarra 460 MW
Shoalhaven 240 MW
Mt Piper 1000 MW
W’wang 0 MW
Total = 4860 MW (4400 MW required to meet SRS)
SLIDE 16
QUESTIONS
QUESTIONS
SLIDE 17
SUMMARY
•
•
•
•
•
•
Region only shutdown
No change to electrical sub-networks
Minimum of one SRAS to be procured per sub-network
Still four sources of restart supply
New definition of SRAS
Expect to be able to provide auxiliary supply/connection
to the majority of major generation within 90 minutes.
• Rate of load restoration will depend on rate of
generation restoration and is outside AEMO’s control.
SLIDE 18