edf centre d'ingénierie hydraulique
TRANSCRIPT
Centre d’Ingénierie Hydraulique
Tidal stream demonstration project at Paimpol-Bréhat (France)
ICOE2014 – Halifax, NS Canada (Nov 2014)
EDF Hydro Engineering Centre
Contents
1. Project architecture and layout
2. Construction and implementation
3. Conclusions
1. Project architecture and layout
Project architecture and layout
Architecture
Project architecture and layout
Layout
2. Construction and implementation
Construction - Implementation
Administrative procedures (2008-2010) 16m turbine prototype testing on site
(2011-2012 ; 2013-2014) Prototype validation, stand alone Marine works procedures validation and improvement
Export cable manufacture and installation (2012) Onshore + offshore substation (2012-2014)
Export cable stabilization (2013) Project next phase (2015)
Installation of 2 pre-industrial 16m turbines, Connection to the grid in Fall 2015.
Construction - Implementation – Turbines (OpenHydro)
Phase 01 : Test of the prototype (OCT-16-01, « Arcouest ») Key objectives of the prototype testing
Prove the technology concept, Develop and validate reliable Method Statements for marine
operations : deployment and recovery, Collect data (electrical, structural, environmental monitoring).
Construction - Implementation – Turbines (OpenHydro) Test conditions (winter 2013-2014)
Test period: Dec. 2013 to April 2014. Very severe winter conditions : 7 significant storms ; 3 of them combined
with high spring tides conditions. Wave height over 8.5 m recorded at the turbine location.
Key results The turbine ran and generated power during 1700 hours. A total of 510 hours of data was recorded. The turbine performance have been confirmed. Some improvements identified to improve the long-term reliability for Phase
02 turbines.
⇒ Successful testing in real conditions. Validate the principle of the 16m diameter prototype developed by OpenHydro. ⇒ The PS2 turbine design benefits from the feedback from the prototype l’Arcouest :
Improved reliability and performance, Industrialization : design for manufacture and assembly
Construction - Implementation – Turbines (OpenHydro)
Construction - Implementation – Offshore/onshore substations (General Electric)
Functions:
Drive the turbines (MPPT) Power conversion (AC => DC) Increase voltage for export to shore Turbine monitoring and SCADA system Auxiliaries power supply
Location: Submerged Fixed on Turbine n°1
Dimensions: 9m length, 3m diametre, 65 tons
Construction - Implementation – Export cable Manufacture (Silec Cable)
Specific design:
DC (+/- 5kV) Optical fibres 16km long – factory built junctions Double armour, free floading, coilable Prototype validation
Construction - Implementation – Export cable Installation – LD Travocean
Constraints:
Landfall (low water depth, rocks) Cable buried in seabed (jetting) on 5km Surface laid on 11km, additional protection with cast iron pipes Strong currents
Construction - Implementation – Export cable Stabilization – Red7Marine
Freespans reduction: Cable realignment Cable support by groutbags
Stabilization: 121 concrete matresses
Construction - Implementation – Connection system
Circuits to be connected: Turbine – Power: 3 single core jumpers Turbine – Auxiliaries: 1 multi-core electrical jumper Turbine – Optical: 1 four-fibres optical jumper Export – Power: 2 single core jumpers Export – Optical: 2 four-fibres optical jumpers
Constraints: All components are submerged, no access Electrical characteristics (U, I, Hz) available products Turbine deployment (positioning, umbilical handling) Site conditions (hydrodynamic, consented area, turbines
positions) Marine works Reliability/Maintenance Project time schedule and budget
Construction - Implementation – Connection system hardware (Siemens)
Chosen solution:
Use of wetmate connectors
Advantages:
Existing products / track record Adaptable to turbine position Use of small DSV for future disconnection/connection
Connection:
By divers
3. Conclusions
To be highly considered for future projects
Turbines: Robustness / reliabilty Energy production Offshore operations (speed and positioning accuracy at limited costs) Foundations / anchoring The ideal turbine will be the best tradeoff
Connection system
Reduce costs Keep reliability Subsea cables integrity Integrated connection (all type of connectors connected at the same time) « Self-connecting » turbine
Offshore works
Surveys Particular constrains (« energetic » sites) Tidal windows / weather windows Keep it quick and simple (as far as possible…)
To conclude
Paimpol-Brehat tidal stream demonstrator project
will be a basis for the industry
The first reference in France that will guide any
further industrial development
Thank you for your attention