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The eStorage project
WP1 Presentation
Henri Jacquet-Francillon - EDF
eStorage project : WP1
Objectives and organisation
Objectives :
• Demonstrate the feasibility and benefit of converting a large fixed speed pumpturbine into a variable speed machine: Le Cheylas PSP unit 2 (240 MW)
• Evaluate the likely benefits of such conversion,
• Monitor results from the demonstration plant and provide data for WP3
• Develop solutions for conversion of a significant share of European fixed rotating
speed pumped hydro storage units into variable speed units
Organization :
eStorage ambition :
« Deploy flexible PSPs
across the EU and
enhance grid
systems to support
the integration of
renewable energy »
• EDF : Hydro and research & development divisions.
• ALSTOM Grenoble (turbine), ALSTOM Birr (DFIM)
© 2013 eStorage
Upgrade of le Cheylas PSP
Presentation of le Cheylas
PSP, located in the Alps, close to Grenoble
• Commissioned in 1979
• 2 identical 240 MW reversible units
A plant with two purposes :
• Electricity generation (Arc river inflows)
• Electricity storage, on a daily cycle
Benefits from conversion of
unit 2 to variable speed,
• Increased efficiency in both turbine
and pump mode
• +/- 35 MW regulation in pumping mode
© 2013 eStorage
Upgrade of le Cheylas PSP
Details of operation
Main components to be replaced, modified or added :
• Runner and wicket gates
• Motor / generator and its refrigeration system (replaced)
• Main transformer
• Overhead travelling crane
• Additional electrical equipment (VSI)
Main challenges :
Optimisation of hydraulic design to both gain efficiency and extend range
of operation in pump mode
Minimise impact on existing structures and handling equipment of
increased weight of the new motor generator
Minimise downtime of unit 2 for conversion
© 2013 eStorage
WP1 Actions (1)
Task 1.1 : performance and service target
• A comparison between the operational performance of le Cheylas in 2010, 2011 &
2012 in its existing configuration and of its probable operational performance over
the same years with a variable speed unit
• The increased turbine efficiency procures additional peak generation both from the
Arc river inflows and from the volumes from the lower reservoir, and should
therefore procure - under likely future values of peak energy – additional revenues
that justify the expenditure incurred by improving the efficiency of the pumpturbine,
• Concerning the ancillary services in pump mode, under the current French grid
code compensation for ancillary services, the additional revenues are unlikely to
justify the corresponding expenditures. However, compensation to operators for
providing ancillary services may need to be increased in the coming years to take
into account the development of wind and solar projects
© 2013 eStorage
WP1 Actions (2)
Task 1.2 : Unit Design and Model Test, AHF
• The Basic design of the motor generator has begun, including the first mechanical
computations , and the main characteristics have been determined : weight, size
• Based upon the new runner design, the flow transient computer simulations have
been performed : the overspeed and overpressure values during these transients
are acceptable,
• The model tests of the modified pump-turbine are underway : the first results
indicate that the performance targets (efficiencies and extended operating range in
pump mode) should be reached,
• Simulations conducted by ABB (the VSI manufacturer) to verify compliance with
the French grid code : harmonic studies, short circuit studies, response to a voltage
drop, amperage variation during machine start-up &shutdown are well underway
(ABB final report is due at the end of November). No difficulty has been identified
so far.
© 2013 eStorage
WP1 Actions (3)
Task 1.2 : Unit Design and Model Test, EDF, re engineering of the whole unit electrical equipment
• The basic design of the circuit breaker used for the DFIM, for the launching in motor mode and for
the regenerative braking sequence (based upon ABB simulations) has been performed,
• The basic design of the GCB (Generator Circuit Breaker), using the results of the ABB simulation has
also been performed,
• A verification that no change in design of the new main transformer for unit 2 is necessary due to
the different harmonics of the new unit,
• DFIM rotor feeding : studies have started for the isolated phase bus ducts,
• The existing structures can take the load and torque applied by the stator ; the best way to apply the
additional weight of the new rotor to the unit fixed parts and civil structures is being worked out ,
• The cooling system modifications required for unit 2 are now defined,
• Handling of the heaviest component (the new rotor) : The existing metallic supports of the
overhead travelling cranes and their foundations can take the additional weight. The extent of the
modifications to the travelling cranes is still being studied.
© 2013 eStorage
WP1 : next year actions
Get ready to start the demonstration phase
• Final results of Model tests are expected in early December 2013,
• The objective is to complete all design & tests necessary and to
identify, quantify and to reduce to an acceptable level all major
project risks by the end of 2013,
• Starting then procurement in early 2014 should be adequate for
achieving unit 2 conversion to variable speed in the selected
2016 window to limit the loss of revenue induced by unit 2
© 2013 eStorage
WP1 : critical success factors
• Reach target Performances of modified pump-turbine
• Re arrange equipment in the powerhouse
• Compliance with grid code
• Duration of Outage period
: looks realistic but is still an important risk to control during demonstration phase
• Modify Overhead Travelling crane :
• Take new rotor weight :
two options appear satisfactory ; best one to be selected
one preferred option identified – feasibility being confirmed
• Adapt interfaces with cooling system, SCADA, Bus bar, GCB..
© 2013 eStorage
eStorage project
Summary of deliverables
© 2013 eStorage
A consortium of energy-industry
leaders and academic researchers
Algoé, a management consultancy.
Alstom, a leading power generation
and grid equipment and solutions
DNV KEMA, the global expert in
energy and sustainability consultancy.
EDF, the world’s largest producer of
Elia, one of Europe’s leading electricity
transmission system operators.
Imperial College, a provider of worldclass education and research.
© 2013 eStorage

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