Technology Qualification for offshore HVDC...24.01.2013 Presentation outline Introduction to Det Norske Veritas (DNV) Building a position in power system transmission and distribution

Tore Langeland24.01.2013

Technology Qualification for offshore HVDC

DeepWind 2013 - 10th Deep Sea Offshore Wind R&D Conference

© Det Norske Veritas AS. All rights reserved.


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Presentation outline Introduction to Det Norske Veritas (DNV)

Building a position in power system transmission and distribution

Research and innovation in DNV

Risk based approach for development of offshore HVDC transmission technologies

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Highly skilled people across the world

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10,400employees

300offices

100countries

DNV Group

DNV KEMAEnergy &

SustainabilityDNV

Maritime Oil & GasDNV

Business Assurance



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Build and share knowledge

We invest 6% of our revenue in research and development

We take a lead role in joint industry research and development projects

Through our standards, rules, recommended practices and software solutions we share knowledge with the industry

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Risk based approach for development of offshore HVDC transmission technologies



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Outline Motivation

Technology Qualification Process

Qualification Basis

Technology Assessment

Other relevant initiatives

Further work – JIP Invitation

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Motivation



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MotivationBackground

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

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Picture source: 50Herz



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MotivationOffshore HVDC transmission

Level 1Two converter stations

Capacity less than maximal loss of infeed

Level 2Three or more converter stations

Capacity less than maximal loss of infeed

Level 3Multiple converter stations

Capacity higher than maximal loss of infeed

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Lack of relevant standards for offshore transmission

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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.



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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.



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Qualification Basis

Technology Deployment

Mod

ifica

tions

Qualification Plan

Execution of the Plan

Performance Assessment


Threat Assessment

Requirements not met or changing requirements

All requirements met



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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

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Increases the RISK exposure



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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

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Qualification Basis



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Qualification Basis

Technology specification

System description

Standards and industry practice

Maintenance and Operation strategy

Boundary conditions

Requirements specification

Reliability, Availability, Maintainability

Functional requirements

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Technology AssessmentTechnology breakdown Component

Purpose/description

Grid level

Main challenges

Technology categorization1. No new technical uncertainties

2. New technical uncertainties

3. New technical challenges

4. Demanding new technical challenges

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Application Area

Degree of novelty

Proven Limited field history

New or unproven

Known 1 2 3

Limited Knowledge 2 3 4

New 3 4 4



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Based on STRI experience fromTesting, 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



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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

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DC circuit breaker





DC/DC converter

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DC circuit breaker





DC/DC converter

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*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)



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Other relevant initiatives



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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)

IEC/CENLEC

TC 115 High Voltage Direct Current (HVDC) transmission for DC voltages above 100 kV

CLC/SR 115 High Voltage Direct Current (HVDC) Transmission for DC voltages above 100kV (Provisional)

German commission for electrical, electronic & information technologies

Technical guidelines for first HVDC grids - A European study group

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Picture source: ABB



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Future work



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Joint Industry Project

Why:

Need for a faster, more efficient and more reliable deployment of offshore HVDC transmission systems.

How:

Integrating ongoing activities and experiences of different technologies in new environments with a proven method for risk management -the DNV RP-A203.

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Why DNV KEMA and STRI?DNV KEMA

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

More than 80 years of experience in electric transmission and distribution including accredited high voltage testing facilities

The world’s second largest consulting company for wind energy projects with 30 years of wind energy experience

Leading certifying agency for offshore wind projects

Continuously running 30-40 Joint Industry 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.

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Test of HVDC VSC for an offshore application at STRI high voltage laboratory (Photo: ABB)



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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 October 2012- Industry wide hearing by Q1 2014- Final publication in Q2 2014

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Thank you for your attention!

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Safeguarding life, property and the environment

www.dnv.com

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Documents

Technology Qualification for offshore HVDC...24.01.2013 Presentation outline Introduction to Det Norske Veritas (DNV) Building a position in power system transmission and distribution