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