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

Wind R&D Seminar – Deep Sea Offshore Wind

Challenges and Design of Offshore Substations

Christer Olerud

Trondheim

20.01.2011

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New large Nordic company

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Offshore wind farm overview

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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

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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

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Inter array cable network

Optimizing inter-array

cable network

1 or 2 substations,

inside or outside wind

farm area

Radials or loops

Cable sizes

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WES – Wind Energy Simulator

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Offshore substation layout and equipment

Cooling of transformers *

Switchgear

Cable pull-in

Bus ducts *

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Accommodation

External cladding

Optimized layout

Installation *

Main transformers

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160 MVA transformer from ABB

GIT: Gas insulated transformer (Toshiba)

Offshore substation, bus ducts

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Offshore substation, installation

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

Offshore substations

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Reactive compensation

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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)

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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!

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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: christer.olerud@goodtech.no