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Offshore Project CertificationOffshore Seminar, Japan, 2015-03-03Dipl.-Ing. Tees Nachtigall, DEWI-OCC Offshore and Certification Centre GmbH
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Certification Scenarios Offshore
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Certification Schemes
IEC 61400-22:2010 GL COWT 2005 / 2012DNV-OSS-901 BSH StandardsDEWI-OCC Process
Technical Guidelines
IEC 61400-3:2009DNV-OS-J101:2013DNV-OS-J201:2013ISO 19902:2007ISO 19903:2006
Site assessment
TYPE CERTIFICATE
Project certificate
Periodic monitoring
Site Specific design
assessment
Manufacturing evaluation
Transport & installation evaluation
Commissioning
www.dosits.orghttp://www.wind-energy-the-facts.org
Project Certification acc. to GL Guideline (offshore)
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Concepts for Foundations„Conventional“ Foundation Types
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Source: www.renewablegreenenergypower.com
Monopiles Gravity Base Foundations
Concepts for Foundations„Conventional“ Foundation Types
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Space Frame StructuresSource: www.renewablegreenenergypower.com
Concepts for FoundationsFloating Structures
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Floating StructuresSource: www.renewablegreenenergypower.com
Situation in Germany
Facts and Figures:
• Today: 23% Energy from Renewables, Target: 80% in 2050 1)
• Offshore Wind plays a central role in that 1)
• Situation North Sea
~106 OWF, total capacity ~36 GW 2)
• Situation Baltic Sea
~ 27 OWF, total capacity ~0,5 GW 2)
• Investment per offshore wind farm 1.4 to 2.0 billion € 1)
1) Source: Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety (BMU)2) Source: Wind Energy Agency WAB
Source: Federal Maritime and Hydrographic Agency (BSH) www.bsh.de
Situation in GermanyGerman Offshore Wind Farm Planning
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Situation in GermanyGerman Offshore Wind Farm Planning
Source: Federal Maritime and Hydrographic Agency (BSH) www.bsh.de
Design Basis
Design
Manufacturing
Commissioning
Project Certificate
Transport & Installation
Scope of Project Certification
Scope acc. to BSH Standard „Construction“1. 1st BSH release
• Design Basis Evaluation• Preliminary Design Review
2. 2nd BSH release• Basic Design
3. 3rd BSH release• Implementation Planning
4. Operation (4th BSH) release• Production Monitoring• Transport Monitoring• Installation Monitoring• Commissioning Monitoring
Project Certificate
5. Operation• Recurrent inspections
6. Decommissioning
In-service inspections
Project Certification
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What sensors and measurement Equipment is needed?Mechanical loads measurements of a 5 MW wind turbine offshore.
About 250 sensors (strain gauges, accelerators, temperature, and all operational external & internal conditions are monitored)
Condition MonitoringPlanning
Current TrendsLiDAR Wind Speed Measurement
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Current TrendsFloating Structures
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Floating StructuresSource: www.renewablegreenenergypower.com
Current TrendsInter-Array Voltage Increase
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Advantages:Reduction of transmission lossesBetter clustering of turbinesMore design options available including the
option to connect all the power to a single platform and the possibility of cheaper aluminium cables
Reduction in the number of offshore substations required for a higher voltage system compared to medium voltage
Disadvantages:Currently no sub-sea cables availableDesign Standards need to be adjusted for
use of HV (e.g. IEC 61400-1 is onlyapplicable for MV)
Increase of the inner voltage of radial or ring inter-array systems from 36 kV AC (operating at 33 kV) to 52 kV AC (operating at 48 kV) and 72.5 kV AC (operating at 66 kV).
Current TrendsInter-Array Voltage Increase
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33/132 kV Configuration
Source: “Investigation of use of higher AC voltages on offshore wind farms”, R. Mc Dermott, Garrad Hassan and Partners Ltd, EWEC 2009
Alternative HV Configuration
Thank you.
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Contact
DEWI-OCCOffshore and Certification Centre GmbH
Am Seedeich 927472 Cuxhaven / Germany
Tel.: +49 (0) 4721-5088-0Fax: +49 (0) 4721-5088-43
Info@dewi-occ.dewww.dewi-occ.de
Thank you for your attention!
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