Tidal stream demonstration project at Paimpol-Bréhat (France)

Transcription

1 Centre d Ingénierie Hydraulique Tidal stream demonstration project at Paimpol-Bréhat (France) EDF Hydro Engineering Centre ICOE2014 Halifax, NS Canada (Nov 2014)

2 Contents 1. Project architecture and layout 2. Construction and implementation 3. Conclusions

3 1. Project architecture and layout

4 Project architecture and layout Architecture

5 Project architecture and layout Layout

6 2. Construction and implementation

7 Construction - Implementation Administrative procedures ( ) 16m turbine prototype testing on site ( ; ) Prototype validation, stand alone Marine works procedures validation and improvement Export cable manufacture and installation (2012) Onshore + offshore substation ( ) Export cable stabilization (2013) Project next phase (2015) Installation of 2 pre-industrial 16m turbines, Connection to the grid in Fall 2015.

8 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).

9 Construction - Implementation Turbines (OpenHydro) Test conditions (winter ) Test period: Dec to April 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

10 Construction - Implementation Turbines (OpenHydro)

11 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

12 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

13 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

14 Construction - Implementation Export cable Stabilization Red7Marine Freespans reduction: Cable realignment Cable support by groutbags Stabilization: 121 concrete matresses

15 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

16 Construction - Implementation Connection system hardware (Siemens) Chosen solution: Use of wetmate connectors Connection: By divers Advantages: Existing products / track record Adaptable to turbine position Use of small DSV for future disconnection/connection

17 3. Conclusions

18 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 )

19 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

20 Thank you for your attention