Assessing Tidal Energy Resource

Transcription

1 Assessing Tidal Energy Resource Frank Biskup, Bilbao Marine Energy Week, Bilbao 1

2 Tidal Farm 2

3 Tidal Site ADCP with 10 min average 3

4 Tidal Site ADCP with high resolution of 2 Hz 4

5 Tidal Site ADCP Measurement Location Low resolution measurement High resolution measurement Repeated on nearby sites Location of drilling core 5

6 Tidal Site ADCP Measurement Location Low resolution measurement High resolution measurement Repeated on nearby sites Location of drilling core Overlay of satellite or aerial photographs gives explanation Structured staged approach necessary! 6

7 Iterative stage process to assess the resource and optimize the site selection Measurement Modeling Project Layout Evaluation Array Design & Assessment 7

8 Measurements to collect solid data basis for model calibration and site characteristics Acoustic Doppler Current Profiler (ADCP) >29.5 days to resolve tidal periods Measurement Sampling rate >2Hz to resolve current fluctuations and wave parameter Modeling Project Layout Evaluation Repeated on nearby sites Multibeam Sonar Array Design & Assessment ~2m resolution to resolve seabed sufficiently Bathymetry of entire project area 8

9 Model verified by measurements gives high value for park layout & production estimates Tidal Flow Model 2D / 3D Model (Mike21 / Mike3 /...) Measurement Tidal currents / heights across the site Hotspot identification Modeling Project Layout Evaluation Array Design & Assessment 9

10 Resource data base and technology constraints provide array design Localize Buildable Zones and Array Design Considerations Measurement Numeric modeling of wake propagation (large- and small-scale) Modeling Project Layout Evaluation Large-scale turbine-to-turbine interactions Park efficiency estimation Array Design & Assessment Production estimate 10

11 The turbine performance for park design is carefully verified by three stages Measurement small-scale tank testing Modeling Project Layout Evaluation Revenue vs Cost Technology Array Design & Assessment numerical simulations prototype testing / IEC performance assessment 11

12 Further Design Basis Specifications Met-Ocean conditions: long-term survey Weather survey Speed and directional distribution Extreme weather analysis Wind-wave correlation simulation Extreme wave impacts At least 20 yrs hindcast Geological and geotechnical survey Drill samples and geological report Seismic considerations Geotechnical evaluation 12

13 Not only high velocities are important... Installation & Maintenance Operation of plant All phases have to be covered and watched sufficiently! Shut off of plant 13

14 Availability is not only a question of turbine robustness: site accessibility Wave heights Wave height Symbol limit. 0,5 m o 1 m x 1,5 m + 2 m * 2,5 m Working windows below limiting wave height Operability for Installation and Retrieval Maintenance Concept & Solid Design Basis! 14

15 Further Design Basis Specifications Limitations due to Environmental Impact Assessment (7) Species at site and design parameters impacting these Restrictions by regulatory bodies and stakeholders... Auxiliary site information (8) Icing conditions Marine accessibility Grid accessibility Marine competitive users 15

16 Project Update Jindo Korea Project Location: Flow Speed Max. 3.5 m/s Water Depth 35.0 m HyTide Technical Data: Rated Power: 110 kw at 2.9 m/s Rotor Diameter: 5.3 m Direct drive, seawater lubricated bearings Permanently excited generator Gravity based concrete foundation Project Status: Turbine installed in spring 2011 Turbine deinstalled in fall 2012 Engineering feedback inspection 16

17 Renetec and their subcontractors delivered and installed the support structure Support structure was installed exactly on the planned location To avoid: Sea cable was destroyed during support structure installation delay of project by one year 17

18 Installation of Turbine in Korea 18

19 Going to Full Scale: Project EMEC 01 Site Data EMEC01 / Scotland Flow Speed: 4.5 m/s Water Depth: 33.0 m Technical Data HyTide Rated Power: 1 MW at 2.8 m/s Rotor Diameter: 13.0 m Direct drive, seawater lubricated bearings Permanently excited generator Drilled monopile foundation installed 2011 Assembly of turbine ongoning Installation planned summer

20 Installed Monopile 20

21 Installed Monopile 21

22 Installation 22

23 Concluding Summary Staged approach for site selection and project evaluation leading to a reliable project design base Verification through prototype testing (for example IEC ) Collaboration of project developers, investors and turbine developers is the key especially if tasks are split among partners The resource determines not only the AEP risk mitigation through solid design base Step by Step up-scaling via prototypes and small parks to achieve the vision! 23

24 Contact: Dipl.-Ing. Frank Biskup Voith Hydro Ocean Current Technologies GmbH & Co KG tel: mail: 24

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