Tasmanian Frequency Standards Review Hydro Tasmania Perspective - - PowerPoint PPT Presentation
Tasmanian Frequency Standards Review Hydro Tasmania Perspective June 2008 1 Assessment of Options Status quo (current standard) Gunns, Tamar Valley Power (TVP) unable to connect TVP proposed standard Imposes very onerous design
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Status quo (current standard)
Gunns, Tamar Valley Power (TVP) unable to connect
TVP proposed standard
Imposes very onerous design and operational
requirements for Tasmania
Basslink import severely constrained Net decrease in supply with Bell Bay closure Basslink stranded in export Major investment required in new fast raise services (up to
$100 million)
Limited development of new wind in Tasmania
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Neither standard alone provides increased supplies
TVP proposal decreases competition from Victoria
TVP proposal results in tighter standard plus
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Tighter standard
Increases FCAS requirements Impacts Basslink capability Increases system security risk (UFLS,OFGS,SPS) Add significant redesign cost (UFLS,OFGS,SPS)
Contingency Size
Not covered by NER Larger contingency exacerbates FCAS raise supply issues No dispatch co-optimisation Creates Basslink dispatch issues
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Demand (MW) 900 1000 1400 1800 Inertia (MWs) 4500 4600 7300 9700 47.5 Hz 95 90 67 47
48.0 Hz 126 117 82 65 47.5 Hz 225 211 132 109 48.0 Hz 307 291 160 129
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FCAS (R6) trapezium for 1000MW Tasmanian system efficient dispatch
FCAS R6 capability Generation dispatched 1100 120 1000 80 Operating point Max R6 in dispatch Actual R6 available in bids
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Maximum local raise required
50MW
Start of import constraint (=Total R6 required minus local supply)
Local raise 478MW (metered)
Basslink imports 0 to 478MW
No-go zones 0MW
Start of reversal constraint (=Total R6 required minus local supply)
Basslink exports 0 to 594MW
50MW
Maximum local raise required
No local requirement No local requirement No FCAS transfer 594MW (metered)
A B
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FCAS R6 capability Generation dispatched 1600 1500 Actual R6 in bids at
FCAS (R6) trapezium for 1000MW and 1500MW Tasmanian system efficient dispatch
Max R6 in dispatch
162 90 120 80
1000 1100
Tasmanian FCAS (Raise) requirements for reversal from export
50MW 0MW
Start of reversal constraint (=Total R6 required minus local supply)
Basslink exports 0 to 594MW
50MW 594MW (metered)
No FCAS transfer
No-go zones
New max Current max
Tasmanian Demand 1000 1400 Tasmanian Inertia 4600 7300 47.5Hz, 144MW loss 90 67 48.0Hz, 144MW loss 117 82 47.5Hz, 210MW loss 211 132 48.0Hz, 210MW loss 291 160
FCAS (R6) Table Tasmanian FCAS (Raise) requirements for generating unit contingency under import conditions
Local raise
Current max
478MW (metered) 50MW Start of import constraint (=Total R6 required minus local supply)
Basslink imports 0 to 478MW
No-go zones 0MW 50MW
No FCAS transfer New max
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Basslink imports reduced by up to 200MW Basslink stranded in export Net energy supply for Tasmania may decrease
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Small revenue stream for suppliers Relatively high cost of supply Generators provide and pay for service Costs can only be recovered around 10% of the time
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100 200 300 400 500 600 700 800 900 G
e r n
I m p r
e m e n t s D e m a n d R e s p
s e L e a d A c i d B a t t e r y F l y w h e e l K i n e t i c c
p l i n g V R B S u p e r c a p a c i t
s D i e s e l U P S
? $000 /MW
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$2bn energy & $50-100m FCAS markets Costs and additional penalties (non-compliance) are
FCAS is provided by generators and interruptible
Co-optimisation of largest unit occurs as a market
UFLS is used for multiple contingency events;
NZ has different features and hence different
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Issues
Tighter standard and larger contingency will cause severe
R6 supply problems and operational problems
Increased reliability risk Increased security risk
Hydro Tasmania Proposal
Maintain current frequency standard Limit the contingency size to 144MW Innovative solution to allow Gunns and Tamar Valley
Power to connect