Transcript VIC SRAS

VICTORIA 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
a) From NSW
b) From SA
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 Victoria peak demand = 10,000MW
• Need to supply 4,000MW 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 two electrical sub-networks in Victoria
o Region only shutdown provides incentive to consider
Victoria as a single electrical sub-network due to
connections to other regions
SLIDE 4
RECOMMENDED CHANGES (CONT.)
• Currently four SRAS in Victoria – two in each subnetwork
o Using supply from NSW & SA plus one SRAS still provides
three sources of restart supply
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 Victoria will have three restart
sources
o
o
o
From NSW
From South Australia
SRAS
• A restart will normally start from all three sources
concurrently.
o
For the purpose of this exercise we will assume SRAS is not available so restart
will be managed from connections to NSW & SA only and synchronise at
KTS/TTS
• 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
•
•
•
•
•
•
Murray
Northern Hydros
Latrobe Valley – Loy Yang A & B, Hazelwood, Yallourn, Valley Power Gas,
Jeeralang A & B
Mortlake
Laverton North
Newport
o There are potentially a number of ways to do this
SLIDE 9
RESTORATION FROM NSW
• Energise Murray – auxiliary supply/connection to 1000MW generation made
available. Set Murray voltage < 335KV.
• Energise DDTS 330KV & 220KV bus
• Energise MBTS – auxiliary supply/connection to 450MW generation at
Northern Hydros available
• When generation on line at MBTS reduce MBTS voltage
< 230KV and energise EPS - auxiliary supply/connection to 120MW
generation at EPS available
• Energise SMTS from DDTS– auxiliary supply/connection to 160 MW
generation at Somerton made available
o
load required to be restored at SMTS on energising to manage voltages
• Energise TTS and complete loop to EPS
• Restore WOTS – DDTS (completing path back to Tumut)
• Restore second circuit between DDTS & EPS
SLIDE 10
MURRAY TO THOMASTOWN
SLIDE 11
RESTORATI0N FROM NSW (CONT.)
• Restore TTS – ROTS – voltage at TTS < 225KV
• Restore load ex ROTS sufficient to restart an SVC
• Restore ROTS – HWPS – auxiliary supply/connection to 1000MW
generation at Hazelwood made available.
• Restore ROTS – YPS – auxiliary supply/connection
to 1400MW
generation at Yallourn made available.
• Restore HWPS – JLTS – auxiliary supply/connection to 440MW of
generation at Jeeralang made available.
• Restore HWPS- HWTS – LYPS auxiliary supply/connection to
3000MW of generation at Loy Yang and Valley Power made available.
• Restore second path between TTS-ROTS-YPS-HWPSJLTS
• Synchronise to network restored from SA at KTS/TTS
SLIDE 12
THOMASTOWN TO LATROBE VALLEY
SLIDE 13
RESTORATION FROM SA
• Restore S_EAST – HYTS – APD – MOPS 2 line – auxiliary
supply/connection made available to 500MW of generation at Mortlake
•
•
•
•
•
•
Restore auxiliary loads at APD
Restart one unit at Mortlake to assist with voltage control
Restore MOPS – MLTS and energise 220KV bus.
Restore MLTS – GTS load required at GTS to manage voltage
Restore GTS- KTS
Restore KTS – ATS – LNGS – auxiliary supply/connection made
available to 300MW of generation at Laverton North
• Restore KTS – ATS – BLTS - KTS loop
• Restore BLTS – NPS – auxiliary supply/connection made available to
500MW of generation at Newport
• Synchronise to network restored from NSW at KTS/TTS
SLIDE 14
DIAGRAMS
SLIDE 15
TIMING ESTIMATES TO MAKE AUXILIARY
SUPPLY AVAILABLE
• Elapsed time = 30 minutes
o
o
o
Murray > 1000MW
Northern Hydros 570MW
Mortlake 500MW
• Elapsed time = 60 minutes
o
Somerton 160MW
• Elapsed time = 90 minutes
o
o
o
o
Laverton North 300MW
Newport 500MW
Hazelwood 1000MW
Yallourn 1400MW
• Elapsed time = 120 minutes
o
o
Jeeralang 440MW
Loy Yang & Valley Power 3000MW
SLIDE 16
AFTER 4 HOURS – LIKELY SUPPLY
CAPACITY
•
•
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•
•
•
•
•
•
•
•
•
NSW/Murray 1000 MW
Northern Hydros 500 MW
Somerton 160 MW
Mortlake 500 MW
SA connection 400 MW
Newport 500 MW
Laverton North 300 MW
Jeeralang 400 MW
Yallourn 300 MW
Hazelwood 400 MW
Loy Yang 1000 MW
Valley Power 300 MW
Basslink 300 MW (cannot be used in initial restart process)
Total = 6060MW (require 4000 MW to meet the SRS)
SLIDE 17
QUESTIONS
QUESTIONS
SLIDE 18
SUMMARY
•
•
•
•
•
•
Region only shutdown
Move to a single electrical sub-network
One SRAS to be procured
Revised SRAS definition
Still three sources of restart supply
Expect to be able to provide auxiliary supply/connection
to the majority of power stations within 90 minutes even
without an SRAS
• Rate of load restoration will depend on rate of
generation restoration and is outside AEMO’s control.
SLIDE 19