simon gamble - hydro tasmania
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Simon Gamble
Manager Hybrid Energy Solutions
4th Annual Remote Area Power Supply Conference
Approaches to renewable energy integration : Insights from Flinders and Rottnest Island hybrid systems
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• Government Business – owned by State of Tasmania
• Australia’s largest clean energy producer – 10TWh pa
• Responsible for generation, distribution and retail in the Bass Strait islands
• Developer, owner and operator of leading hybrid off-grid systems on King & Flinders Islands (our test beds) and for our clients at Rottnest Island, Coober Pedy.
• Leading advisor and hybrid system turnkey contractor
Hydro Tasmania Hybrid off-grid power systems capability
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Hybrid off-grid power systems Next phase of market development
Aspects still being learned:
• Cost and time effective deployment -> scale
• Risk mitigation strategies -> financing
o Asset specification & legacy interactions
o System performance -> revenues
• Role of other energy services (e.g water) in increasing RE utilisation -> value
Concepts now (reasonably) well understood:
• Renewables offer cost and performance benefits
o Extent of economic utilisation dependent on specific site
• Renewables need to be well managed
o Planning, integration (enabling) –> hybrids
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Hybrid off-grid power systems:
• Multiple elements
• Highly integrated
• Fully automated
• Lower operating cost
• Safe, reliable, secure
King Island: • 65% annual RE
• $2m diesel saving pa
• 100% RE operation
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Battery and dynamic resistor controlling frequency
Flywheel providing inertia, fault current
20hrs of 100% renewable operation within a day
Record stands at 63hrs continuous
King Island hybrid system example Multiple enablers supporting renewables in an integrated system (frequency control, reserves, fault current, voltage regulation, inertia etc)
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Cu
rre
nt
Flinders Island Hybrid Energy Hub Project – Objectives and Scope
Generation Enablers RE % Arrangement
2.95 MW Diesel
0.3 MW Wind (privately owned)
None 25%
Hu
b p
roje
ct
Additional wind 60+%
RE third party owned and constrained
New Solar
Resistor
Flywheel
Energy Storage
Project underpins Flinders Island community vision for 100% RE Future
+ + (Biodiesel) (Mini Hydro) (Ocean)
Control
• 900 kW wind
• 200 kW solar
• 1.5MW dynamic resistor
• 850kVA DUPS flywheel
• 750kW /300kWh battery
$12.88m budget including up to $5.5m support from ARENA
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Addressing time, cost and quality barriers Modular, scalable, flexible hybrid solutions
King Island: On site construction was time consuming, disruptive and difficult to resource, quality control harder to achieve on site
Flinders Island Hybrid Energy Hub: Utilises containerised enabling systems requiring minimal site works for deployment Pre-factory tested Full suite of systems (inc. control, switchgear)
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Factory testing of enabling “hub” Resolve issues prior to deployment
Enabling systems:
• Control
• Communications
• Battery
• Dynamic load banks
• Flywheels
• Switchgear
• Transformers
System conditions & contingencies emulated via dynamic load bank
Technicians on site for rectifications
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Factory Acceptance Testing Battery module (Lithium titanate : 750kW/270kWh)
• Comprehensive factory testing of complete system is good risk mitigation
• Fix it the factory versus “what can you live with” once on site
Other mitigations:
• Good contract and specification are invaluable (watch caveats, such as low and high SOC performance)
• Purchaser must become expert in the system (currently)
• Can’t assume simple performance limits. Overall system performance (and your revenue) is heavily reliant on design detail.
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Flinders Island “Hybrid Energy Hub” Rapid system deployment
Site works now underway – road and foundation View from new WTG location of existing 300kW WTG
TIME LAPSE MOVIE OF CONSTRUCTION PROCESS
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Flinders Island Hub Enercon E44 900kW wind turbine Lowest cost renewable energy available
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Flinders Island Hub 200kW fix tilt Solar PV Offered diversity of renewable generation
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Rottnest Island Water and Renewable Energy Nexus
Objective: Supplying cleaner, lower cost energy and water services
Challenges:
• Rottnest Island : 70% diesel; constrained wind; water supply significant load
• Required to be self sufficient in energy and water supply
• Significant environmental (class A Reserve) and aboriginal cultural heritage
Solution:
• Integrate new solar PV with existing diesel & wind generation and water supply
o Sophisticated control & demand management
o Use desalinated water as a lower cost form of storage
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Rottnest Island WREN Planning phase: Energy Review & Roadmap
• Asset condition
• System performance
• Energy Use
• Energy efficiency & renewable energy opportunities
• Solar – abundant resource
• Wind – favorable resource
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Rottnest Island Power system overview
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• 2.1MW diesel system
o 7x 300kW units
o 2 low load diesels
• 600kW wind turbine (30%)
• 1 ML of diesel / $1.5m p.a.
• Water supply and treatment a significant load (12.5% p.a. in 2012)
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Rottnest WREN scope Enabling technology – station control upgrade
• Existing control system approaching end of life
• Supplied Hydro Tasmania’s proprietary hybrid control system
o industry standard PLC based modular system
o Coordinates activity of diesel, renewable and enabling systems
o Flexible and capable – underpins expansion in future
• Included upgrade to diesel unit controllers and feeder management system
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Rottnest WREN scope 600kW fixed tilt solar array
• Additional renewable energy
• Production aligns with system load, adds resource diversification
• Underground HV connection to existing substation
• Fibre link to power station for control
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Location
• Inside settlement area envelope but away from tourism infrastructure
• On the site of an operating airfield
• Sandy site, exposed to saline conditions
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• Increased renewable penetration required faster acting curtailment
• Fibre based communications installed, including additional sub second metering
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Rottnest WREN scope Enabling technology – wind turbine control upgrade
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Rottnest WREN scope Enabling technology – 500kW Dynamic resistor
• Manages variability in renewable generation
• Improves system security
o Provides reserves
o Protects diesel reverse power trips
• Increases diesel savings
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Rottnest WREN scope Demand management - desalination control
• Water on Rottnest Island is desalinated – largest single load (145kW)
• Timing of desalination isn’t always critical as tanks feed customer demand: Interruptible and deferrable
• Desalinate at time of high or surplus renewable energy – avoiding diesel gen.
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• Water storage acts as a form of energy storage
• Uses tanks as a “battery”
• Existing infrastructure / reduced losses
• Demand management will be fully automated and integrated into wider hybrid power system control
• Diesel savings result from “leveraging” the nexus between water production and energy use
• enabling systems make it possible to increase the value of renewables
Rottnest WREN scope Demand management - desalination control
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Operators – key to realising savings Real time remote operator tools
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• Hybrids are sophisticated systems – need to be understood / not feared
o Operators have an important role in design
o Training – comprehensive, not an afterthought
• Vital to provide operators and system managers with real time information
o combined with data historian, management reporting
o Access via web portal and phone app.
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Rottnest WREN Early performance during testing
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Rottnest WREN Early performance during testing
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Customers & Visitor involvement Smart phone App and online dashboard (Under development – mock up only)
• Expand the visitor experience with information about renewable energy
• Promote behaviour change to enhance savings
o Load shifting
o Load deferrable
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King Island app & web site real time data www.kireip.com.au
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Further information:
Hybrid Energy Solutions
Thank you
www.hybridenergysolutions.com.au