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Risk based approach for development of offshore HVDC transmission technologies

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Risk based approach for development of offshore HVDC transmission technologies. EWEA 2012 – PowerPoint PPT presentation

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Title: Risk based approach for development of offshore HVDC transmission technologies


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 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
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
Lack of 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 (VSCs)
  • No Standards for HVDC circuit breakers
  • No overall standard addressing performance of
    offshore grids

7
Technology Qualification Process
8
Technology Qualification Process
DNVs 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 oilgas industry to
    increase stakeholder confidence in applying new
    technologies.

10
Technology Qualification Process
Qualification Basis
Requirements not met or changing requirements
All requirements met
Technology Deployment
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
12
Added value of technology qualification for
offshore HVDC
  • Demonstration of technology capabilities
  • Address stakeholder uncertainties
  • Maturity and uncertainty of technologies
  • Feasibility of offshore HVDC transmission
  • Address the risk exposure
  • Identification and categorization of technologies
    w.r.t. industry experience and maturity
  • Identification and understanding of failure modes
    and the risk picture
  • Development of methods and activities to address
    the risks
  • Overall reliability and availability of
    technologies and systems

13
Qualification Basis
14
Qualification Basis
  • Technology specification
  • System description
  • Standards and industry practice
  • Maintenance and Operation strategy
  • Boundary conditions
  • Requirements specification
  • Reliability, Availability, Maintainability
  • Functional requirements

15
Technology Assessment
16
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

Application Area Degree of novelty Degree of novelty Degree of novelty
Application Area Proven Limited field history New or unproven
Known 1 2 3
Limited Knowledge 2 3 4
New 3 4 4
17
Technology Assessment
  • Based on STRI experience from Testing, Simulation
    Studies
  • Accredited high voltage testing for testing of
    major equipment according to relevant standards
    and customer requirements, e.g. CIGRE
    recommendations for MI DC cables and extruded DC
    cables. IEC 60840 and IEC 62067 for extruded AC
    cables.
  • Simulation of HVDC and HVAC systems using most
    suitable program SIMPOW, PSS-E, PSCAD-EMTDC,
    DigSilent etc.
  • Feasibility and application studies involving
    users and manufacturers

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

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

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

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)
21
Other relevant initiatives
22
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
23
Future work
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".

25
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

26
DNV and STRI
  • DNV
  • Independent foundation with the purpose of
    safeguarding life property and the environment
  • More than 40 years of experience in managing risk
    for the offshore oil and gas sector
  • The worlds second largest consulting company for
    wind energy projects with 30 years of wind energy
    experience
  • Leading certifying agency for offshore wind
    projects
  • STRI
  • Independent power system consulting company with
    an accredited high voltage laboratory.
  • Several large flexible high voltage test halls to
    conduct tests on products with system voltages up
    to 1000 kV.
  • Test halls for testing of pollution, snow, ice,
    salt, fog and rain effects as well as chambers
    for multiple stress, salt fog and extreme
    temperatures.
  • Experience in system studies for wind power
    integration and HVDC applications, including
    multi terminal VSC technology.

Test of HVDC VSC for an offshore application at
STRI high voltage laboratory (Photo ABB)
27
(No Transcript)
28
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environment www.dnv.com
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