tore langeland, yongtao yang and carl Öhlen 17.04.2012 risk based approach for development of...
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Tore Langeland, Yongtao Yang and Carl Öhlen17.04.2012
Risk based approach for development of offshore HVDC transmission technologies
EWEA 2012
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
2
Agenda
Motivation
Technology Qualification Process
Qualification Basis
Technology Assessment
Other relevant initiatives
Further work
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
3
Motivation
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
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 capacity offshore 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
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
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
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
Lack of relevant standards for offshore transmission
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• 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
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
7
Technology Qualification Process
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
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.
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
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.
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
Technology Qualification Process
Qualification Basis
Technology Deployment
Mod
ific
atio
ns
Qualification Plan
Execution of the Plan
Performance Assessment
Technology Assessment
Threat Assessment
Requirements not met or changing requirements
All requirements met
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
11
Why do we need technology qualification?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
Increases the RISK exposure
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
13
Qualification Basis
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
14
Qualification Basis
Technology specification
System description
Standards and industry practice
Maintenance and Operation strategy
Boundary conditions
Requirements specification
Reliability, Availability, Maintainability
Functional requirements
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
15
Technology Assessment
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
16
Technology AssessmentTechnology 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
Application Area
Degree of novelty
ProvenLimited field
historyNew or
unproven
Known 1 2 3
Limited Knowledge 2 3 4
New 3 4 4
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
18
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
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
19
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
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
20
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
*AIS: Air Insulated Switchgear, GIS: Gas Insulated Switchgear Test of HVDC VSC for an offshore application at STRI high voltage laboratory (Photo: ABB)
Test of UHVDC switchgear at STRI high voltage laboratory (Photo: STRI)
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
21
Other relevant initiatives
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
Other relevant initiativesCigré
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)
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Picture source: ABB
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
23
Future work
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
24
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".
© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
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
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© Det Norske Veritas AS. All rights reserved.
Risk based approach for development of offshore HVDC transmission technologies
17.04.2012
27
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