7 th may 2015 presentation to iwfa frank burke, technical director, schwungrad energie ltd
TRANSCRIPT
7th May 2015
Presentation toIWFA
Frank Burke, Technical Director, Schwungrad Energie Ltd.
• Demonstration Project & Technology
• Context & Purpose
• Conclusions
Agenda:
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• Rhode site
• Hybrid of flywheels and batteries
• 2 flywheels * 160kW
• Batteries up to 240kW, 80kWh (full output for 20min)
• MIC 400kVA
• MEC 422kVA
Demo Project Description
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Benefits of Hybrid
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Battery
Kinetic Energy Storage
Chemical Energy Storage
• High Power• Restricted energy
storage• Fast response• Hundreds of
thousands of charge/ discharge cycles
• High energy storage
• Fast response• Thousands of
charge/ discharge cycles
+
Flywheel
Flywheel Construction
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Flywheel Installation
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o Motor/generator spins a heavy flywheel which stores kinetic energy
o Energy taken from grid to speed up the flywheel
o If grid suddenly needs more generation the flywheel control system will draw energy from the flywheel. The flywheel will slow down converting its kinetic energy into electrical energy
o The flywheel is connected to the grid via a Power Control Module AC->DC->AC
How Flywheel Energy Storage Works
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o Many different types with different characteristics
o University of Limerick currently investigating most suitable types for System Services application
Batteries
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Battery Racks
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• Planning permission received for Rhode site
• Connection offer received
• Agreement reached with leading flywheel supplier to collaborate and invest in trial
• Finalising selection of battery supplier
• Collaboration with University of Limerick
• Working closely with EirGrid
• First delivery of equipment has already arrived
Progress to Date
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• Flywheels to be installed Q3 2015
• Trial flywheels Q3 2015
• Install and trial batteries Q4 2015
• Trial hybrid of flywheels and batteries Q1 2016
Timeline
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What System Services are We Providing - Frequency?
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What System Services are We Providing - Voltage?
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• Increased penetration of wind generation has
implications for grid operation• Ireland has high targets for wind generation and is a
weakly interconnected island system• Grid operator in Ireland starting to experience problems
which will be seen worldwide as other countries
increase renewable energy penetration• Schwungrad set up specifically to develop plant to
provide system services to facilitate the integration of
high levels of intermittent generation• Global market in the context of climate change• Ongoing discussions with overseas system operators
incl. China
Why are We Doing This?
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• Wind and solar generation are variable and
unpredictable• They don’t provide system services i.e. don’t respond
instantaneously to provide additional output to
compensate for supply/demand deficit e.g. if large
generator trips• Increasing levels of renewable generation reduces the
percentage of conventional plant on the grid which can
provide system services• Consequently grid has less inertia and is less stable• If large generator trips, frequency will fall more rapidly
because there is less plant able to respond• Other generators may not be able to ride through this
higher Rate of Change of Frequency (RoCoF) e.g. due
to excessive torque on rotor shafts
=> cascading loss of generation and system collapse
Consequences of High Volumes of Wind and Solar 1/2
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Actual Frequency Disturbances
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• The Penetration of Non-Synchronous generation on
the System (SNSP) has to be limited currently to 50%• Otherwise there is not sufficient inertia and, if a large
generator trips, the frequency falls too fast i.e. RoCoF
is higher than other generators can ride through.• This SNSP limit results in curtailment of wind
Renewable energy targets not met May cause financial difficulties for some renewable
generation projects
Consequences of High Volumes of Wind and Solar 2/2
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Curtailment of Wind to Limit SNSP to 50%
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Actual SNSP Dec. 2013
Curtailment of Wind
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Curtailment at 50% SNSP
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Curtailment at 75% SNSP
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• Grid operators have difficulties in accommodating high
penetration of wind and solar generation – being seen
in Ireland before other countries• Renewable generation targets will be difficult to meet
without additional system services• Flywheels/battery hybrid is the ideal solution and does
not displace renewable generation• Schwungrad Demonstration project in Ireland on its
way to validate performance in providing system
services in Ireland and further afield
Conclusions
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Thank you
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