wind r&d seminar – deep sea offshore wind challenges and

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  • Wind R&D Seminar Deep Sea Offshore Wind

    Challenges and Design of Offshore Substations

    Christer Olerud

    Trondheim

    20.01.2011

    1

  • New large Nordic company

    2

  • Offshore wind farm overview

    3

    Offshore substationOffshore wind farm Land connection point

    Cable to shore3-phase ACg o o d t e c h . n o

  • Offshore wind = multidiscipline industry

    4

  • Main Challenges

    Location of offshore substation

    Number of offshore substations

    Infield cable pattern and choice of cable types

    Offshore substation layout

    Reactive power compensation

    Grid connection

    Total electrical system

    5

  • Inter array cable network

    Optimizing inter-array

    cable network

    1 or 2 substations,

    inside or outside wind

    farm area

    Radials or loops

    Cable sizes

    6

  • WES Wind Energy Simulator

    7

  • Offshore substation layout and equipment

    Cooling of transformers *

    Switchgear

    Cable pull-in

    Bus ducts *

    8

    Accommodation

    External cladding

    Optimized layout

    Installation *

  • Main transformers

    9

    160 MVA transformer from ABB

    GIT: Gas insulated transformer (Toshiba)

  • Offshore substation, bus ducts

    10

  • Offshore substation, installation

    11

    http://www.scaldis-smc.com http://www.scaldis-smc.com

    http://www.scaldis-smc.com/http://www.scaldis-smc.com/http://www.scaldis-smc.com/http://www.scaldis-smc.com/http://www.scaldis-smc.com/http://www.scaldis-smc.com/

  • Offshore substations

    12

  • Reactive compensation

    13

    Offshore substationOffshore wind farm Land connection point

    Cable to shore3-phase ACg o o d t e c h . n o

    Wind turbine

    (turbine manufacturer)

    Offshore substation

    (wind farm owner)

    Onshore grid

    (grid owner)

    How to optimize ? Demands from grid owner (grid code)

    Placement of equipment

  • Grid connection

    PCC (Point of Common Coupling)

    14

    OSS

    Onshore coupling point

    OWTs

    External grid

    PCC definition a

    PCC definition b

    PCC definition c

    a) at connection point onshore at the grid

    coupling point

    b) at high voltage busbar at the OSS

    c) at the OWT terminals

    Capability in the onshore transmission grid

  • Thank you for your attention!

    15

    Offshore substationOffshore wind farm Land connection point

    Cable to shore3-phase ACg o o d t e c h . n o

    Thank you for your attention!

    Contact person: [email protected]

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