GE unveils power and propulsion system to cut fuel consumption on PSVs

7 May 2013 (Last Updated May 7th, 2013 18:30)

GE’s Power Conversion business has unveiled a new power and propulsion system for platform support vessels (PSVs) that helps reduce fuel consumption by controlling engine speed.

GE propulsion system

GE’s Power Conversion business has unveiled a new power and propulsion system for platform support vessels (PSVs) that helps reduce fuel consumption by controlling engine speed.

The new variable frequency active front-end (VF-AFE) power and propulsion system will allow vessel owners to use conventional power systems to reduce engine speeds, fuel consumption as well as emissions and maintenance requirements.

According to GE, the VF-AFE system will enable the use of conventional power system components, while operators can use them with minimal training.

GE Power Conversion marine leader Paul English said the VF-AFE allows vessels owners to recover lost efficiency.

"Today, when you operate a conventional engine, its speed is always constant, whatever the load," English said. "So when the load is reduced, you are using more energy than you need because the pistons continue to run at an unnecessarily high speed."

The load on the engines is reduced when a support vessel is operating in dynamic positioning (DP) mode to counter the effects of wind and waves, but all engines are kept running to provide redundancy.

The company claims that with VF-AFE, all the engines remain connected, but their speed can be reduced when the load is lessened.

English said: "We estimate that with the engines loaded at 50% of rated load for a full year on a ship with 8 megawatts of installed power, operating for 300 days a year, 24 hours a day, the fuel savings could be up to $300,000 per year."

According to GE, additional equipment will be required to convert the variable frequency from the VF-AFE system into a fixed frequency, which will be needed for auxiliaries on the vessel.

The VF-AFE system uses a version of GE Power Conversion’s MV 3000 low-voltage drive, which has been modified to make it more compact.


Image: GE’s new VF-AFE system will allow vessel owners to reduce engine speeds, fuel consumption as well as emissions and maintenance requirements. Photo: General Electric.