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Risk based approach for development of offshore HVDC transmission technologies

Risk based approach for development of offshore HVDC transmission technologies. EWEA 2012. Agenda. Motivation Technology Qualification Process Qualification Basis Technology Assessment Other relevant initiatives Further work. Motivation. Motivation. B ackground

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Risk based approach for development of offshore HVDC transmission technologies

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  1. Risk based approach for development of offshore HVDC transmission technologies EWEA 2012

  2. Agenda Motivation Technology Qualification Process Qualification Basis Technology Assessment Other relevant initiatives Further work

  3. Motivation

  4. Motivation Background • 40 GW offshore wind in Northern Europe by 2020 • 150 GW offshore wind in Europe by 2030 • Grid connection of offshore oil & gas installations • The vision of an offshore Super Grid The challenge • To date there exists no operational experience with high capacityoffshore HVDC transmission technologies • Installations far from shore and in harsh marine environments will require high focus on Reliability, Availability and Maintainability • Interoperability challenges arise with technology from multiple vendors Picture source: 50Herz

  5. Motivation Offshore HVDC transmission Level 1 Two converter stations Capacity less than maximal loss of infeed Level 2 Three or more converter stations Capacity less than maximal loss of infeed Level 3 Multiple converter stations Capacity higher than maximal loss of infeed

  6. Lackof relevant standards for offshore transmission • Offshore IEC Standards and DNV Standards only up to 1.5 kV DC (35 kV AC) • Lack of standards for HVDC gas insulated switchgear (HVDC GIS) • No standards for interconnection of Voltage Source Converters (VSC’s) • No Standards for HVDC circuit breakers • No overall standard addressing performance of offshore grids

  7. Technology Qualification Process

  8. Technology Qualification Process DNV’s Definition of Qualification: Qualification is the process of providing the evidence that the technology will function within specific limits with an acceptable level of confidence.

  9. Technology Qualification Process DNV RP-A203 • First edition published in 2001 • Qualification of new technologies where failure poses risk to life, property, the environment or high financial risk. • Qualification of technologies that are not new • Proven components assembled in a new way • Not covered by existing requirements and standards • Proven technology in a new environment • Developed for the offshore oil&gas industry to increase stakeholder confidence in applying new technologies.

  10. Technology Assessment Threat Assessment Modifications Qualification Plan Execution of the Plan Performance Assessment Technology Qualification Process Qualification Basis Requirements not met or changing requirements All requirements met Technology Deployment

  11. Why do we need technology qualification? IncreasestheRISKexposure Testing is conducted according to old schemes that do not take into account new failure modes • Equipment placed in a new environment • Harsh climate • Difficult access • New approach to maintenance and repair strategy • Auxiliary systems • Control of indoor environment • Higher voltage, current and power ratings • Converter and cables • New applications • Multi-Terminal DC (MTDC) • Meshed MTDC grid • New design of major components • DC converter station and valves • Cables • DC switchgear • System behaviour • Control, protection and communication

  12. Qualification Basis

  13. Qualification Basis Technology specification • System description • Standards and industry practice • Maintenance and Operation strategy • Boundary conditions Requirements specification • Reliability, Availability, Maintainability • Functional requirements

  14. Technology Assessment

  15. Technology Assessment Technology breakdown • Component • Purpose/description • Grid level • Main challenges Technology categorization 1. No new technical uncertainties 2. New technical uncertainties 3. New technical challenges 4. Demanding new technical challenges

  16. Technology Assessment Level 2-4 categorized offshore HVDC technologies • Fast and selective detection, location and clearing of faults in a DC grid • DC circuit breaker • Control system for MTDC • Polymer cable system (rating) • Dynamic cable system • DC Switchgear (AIS*/GIS*) • DC/DC converter

  17. Technology Assessment Level 2-4 categorized offshore grid technologies • Fast and selective detection, location and clearing of faults in a DC grid • DC circuit breaker • Control system for MTDC • Polymer cable system (rating) • Dynamic cable system • DC Switchgear (AIS*/GIS*) • DC/DC converter

  18. Technology Assessment Level 2-4 categorized offshore grid technologies • Fast and selective detection, location and clearing of faults in a DC grid • DC circuit breaker • Control system for MTDC • Polymer cable system (rating) • Dynamic cable system • DC Switchgear (AIS*/GIS*) • DC/DC converter Test of UHVDC switchgear at STRI high voltage laboratory (Photo: STRI) *AIS: Air Insulated Switchgear, GIS: Gas Insulated Switchgear Test of HVDC VSC for an offshore application at STRI high voltage laboratory (Photo: ABB)

  19. Other relevant initiatives

  20. Other relevant initiatives Cigré • SC B4 - HVDC and Power Electronics • B4-52, B4-55, B4-56, B4-57, B4-58, B4-59, B4-60 • SC B1 - Insulated Cables • B1.27, B1.32, B1-34, B1-35, B1.38, B1.40, B1.43 EC DG Energy • Working group for offshore/onshore grid development NSCOGI • WG 1 Offshore Transmission Technology ENTSO-E • Regional Group North Sea (RG NS) Picture source: ABB

  21. Future work

  22. Joint Industry Project Why: The need for a faster, more efficient and more reliable deployment of offshore HVDC transmission systems for connection of wind farms, oil and gas platforms, multi terminal interconnectors as well as a future HVDC grid. How: Integrating ongoing activities and experiences of different technologies in new environments with a proven method for risk management - DNV RP-A203 "Qualification Procedure for new technologies".

  23. Joint Industry Project • Scope of work • Activity 1 – Develop a Technology Qualification procedure for offshore HVDC transmission technologies • Activity 2 – Qualification examples • Activity 3 – Hearing process and publication • Participants • Manufacturers • Developers • Operators • Timeline • Kick off in September 2012 • Industry wide hearing by Q1 2014 • Final publication in Q2 2014

  24. Safeguarding life, property and the environment www.dnv.com

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