All-Electric Subsea Processing Advances With Testing of Subsea Variable Speed Drive
The first full-scale prototype of a subsea variable speed drive (VSD) was tested last month in a sheltered harbor in Vaasa, Finland. Designed for subsea gas compression, the subsea VSD operated over 3 weeks in a back-to-back configuration directly with the grid, without motor loads.
A 5-year joint industry project (JIP), started in 2013 between Chevron, Total, Statoil, and ABB, aims to develop transmission, distribution, and power conversion systems for subsea pumps and gas compressors operating at depths of 3000 m and over long distances.
The VSD uses a pressure-compensated design, whereby its power components are cooled by being submerged in oil. The water test proved that the electronic and power components can meet the thermal performance demanded. Before the test, the main drive sub-assemblies and components were pressure-tested at 300 bars in Statoil’s R&D facility in Trondheim, Norway.
Bazmi Husain, ABB CTO, said, “We have demonstrated the successful and reliable operation in a number of high-stress conditions. This is a major milestone in solving such a grand challenge. It takes technology from the laboratory to the field in a structured qualification and pragmatic process, via prototypes and multiple demonstrations.”
The goal is to take power distribution from onshore to the seabed with up to 100 MW capacity being transmitted 600 km to free up the limited space on topside installations. Reduction in costs is possible by having one cable that is distributed to many subsea loads. Additionally, operational costs are reduced, energy and CO2 emissions are lowered, while marine pollution is cut and decommissioning is simplified.
We have to prove to our customers that the entire installation is going to be ultra-reliable because pulling up equipment from 3000 m costs a lot of money,” said Per Erik Holsten, managing director of ABB’s Oil, Gas, and Chemicals business.
The next step is the 3,000-hour shallow-water testing of a subsea power system with two VSDs in a parallel, combined with subsea switchgear and controls, targeted to start late 2018. The first installation of the new subsea power systems in offshore production sites are expected in 2020.
For Further Reading
OTC 27684 Subsea Power JIP—As Enabler for All-Electric Subsea Production by J.Ø Bugge and S. Ingebrigtsen, ABB.
Static Equipment: Understanding Heat Exchangers
Take a closer look at heat exchangers, including the various types and designs available, applications, and selection considerations. This article helps the project engineer, who is not an equipment specialist, to check that economical choices are made across all involved disciplines.
ABS To Classify New Monocolumn Platform Designed for Offshore Malaysia
ABS will classify a new self-elevating platform with a unique triangular monocolumn design from Calm Oceans Pte Ltd.
McDermott Completes First Installation Campaign for R-Cluster Project Offshore India
Completion comes despite two cyclones disrupting the project area during installation, McDermott said.
Don't miss out on the latest technology delivered to your email every two weeks. Sign up for the OGF newsletter. If you are not logged in, you will receive a confirmation email that you will need to click on to confirm you want to receive the newsletter.
16 July 2019
10 July 2019
15 July 2019