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EWEC 2006 Athens

The Challenges of Offshore Power System Construction

Peter Jones

Lars Stendius

ABB

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Troll A Platform

Norway Sweden

UK

Troll A delivers gas to Kollsnes from all the field platforms

70km offshore

47% of Norway’s gas reserves

28% of Statoil’s total own production (oil and gas)

Europe’s biggest offshore gas field in production providing 15% of Europe gas.

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Troll A Platform

Total weight: 678 500 tons

Total height: 472m

Above water 103m

The largest man made structure moved across the surface of the earth as a complete unit

Main objective with the pre-compression project was to increase the production capacity on Troll A

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Customer Values

Reliable power supply

Simple design incorporating redundancies

Power quality control

Operational Versatility

Black Start Capability

Remote onshore connections without the need for grid reinforcement

Expandable modular systems that can easily be expanded to a multi-terminal system

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Customer Values

Robust light-weight, oil-free cable system

Simplified platform design

Compact and low weight

Reduced design weight to allow onshore assembly

Short installation and implementation timescale

Savings from reduction in Green House Gas Emissions

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Customer Values

Savings from reduced need for offshore manning

Remote operation

Significantly lower maintenance

Health Safety and Environmental impact

Removal of risks associated with gas turbines

Noise suppression from enclosed equipment

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Very High Voltage Motor4-pole, 40MW0 - 63 Hz

56kV

Troll A

SM

70 km+/- 60kV

HVDC Light

132kV

Kollsnes

~

=

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Troll A HVDC Light® – power from shore

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Troll A HVDC Light® – power from shore

Land based converter station at Kollsnes

Modular converter unit on the Troll A platform

Two HVDC Light® transmissions units

2 x 40 MW nominal mechanical output

± 60 kV DC transmission voltage

70 km submarine cable

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Very High Voltage Motor for Compressors

56kV Very High Voltage Motors used to drive compressors

Variable frequency operation for smooth start and operation

Weight savings, no platform power transformer required

Completely oil-free concept

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HVDC Light® Submarine Cables

70km ABB sub sea cable

Operating at +/-60kV DC

Robust polymeric cables

Lightweight design which simplifies installation

Very long single lengths of cable loaded directly onto vessels from factory

Oil free design significantly reduces environmental impact

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HVDC Light® Onshore Converter Station

Compact converter building

Pre-assembled and tested equipment such as valves and control system helped to reduce delivery and installation timescales

Fulfills high safety requirements for a gas plant installation

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Installation of HVDC Light® Platform Module

Installation commenced with auxiliary equipment on the first floor

Second and third floor arrives in assembly area

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Installation of HVDC Light® Platform Module

Semiconductor valves suspended from the ceiling in order to withstand platform movement

AC equipment installed on third level

The module is then fully enclosed to maintain a weather proof controlled environment

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Offshore module ready for shipment!

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Installation of HVDC Light® Platform Lift

Completed module lifted gently into position by a large sea barge crane.

The module is lowered onto a pre-fabricated platform extension unit

The module is secured into its final position.

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Lessons Learned At Planning Stage

High focus on finding an environmental appropriate solution

Early selection of a suitable electrical solution (HVDC light technology)

Sufficient time to study, mature and qualify the technical solution

Building trust through open, and good cooperation.

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Lessons Learned At Execution Stage

Continued open and good cooperation

Common and joint approach to problem solving

Ability and willingness to find win-win solutions on difficult technical, commercial and contractual challenges.

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Summary of Lessons Learnt

Very high focus on Safety

When introducing innovative solutions early and close involvement with the client to study and understand the new technical solutions is essential.

Involve highly qualified personnel with high integrity, in problem solving

Involve local knowledge and establish good relations with the relevant industry experts

Statoil and ABB team pictured after successful commissioning of Troll A

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Offshore Power Supplies for Renewables

ABB has a proven concept for power to and from shore

High reliability, high voltage power supplies offshore are possible

Greater understanding of technical risks

Experience and lessons learnt are transferable to the offshore wind industry