Troll A

ABB has delivered its second power-from-shore system to the Statoil-operated offshore gas platform Troll A in the North Sea, 70km west of the Kollsnes onshore gas treatment plant.

According to the company, the system will power two 3,000t compressor modules that have been fitted to the platform’s topside in 2014 and commenced operation in October.

Once the electricity delivered using ABB’s HVDC light technology reaches the 472m-high platform, it is converted back to AC to run the modules.

To cater to other power requirements, ABB provided the onshore and offshore converter stations.

The company also laid two pairs of DC cables and a three-phase AC cable, in addition to providing the 50MW/60kV high-voltage motors that will operate the compressors.

ABB Oil, Gas and Chemicals business managing director Per Erik Holsten said: "This project is an important milestone for ABB as our products are enabling increased production and safeguarding the delivery of natural gas to the European market.

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"With power from shore, the recovery increase can be achieved in a sustainable and profitable way.

"And with power from shore, the recovery increase can be achieved in a sustainable and profitable way."

The Troll A platform was discovered in 1979 and is claimed to be the tallest structure ever moved to another position.

Gas production at the field started in 1996 and during that time its power needs were met by ABB’s 20MW AC cable.

ABB secured a $155m contract with Statoil in March for land-based power supply to the first phase of the Johan Sverdrup oil field development in Norway.

Under the contract, the company supplied systems and equipment to two HVDC converter stations connecting the field with the onshore grid.

Image: Statoil’s Troll A with the new offshore converter station, the white module with the yellow crane in the middle of the platform. Photo: courtesy of Harald Pettersen – Statoil ASA.