Electric propulsion gets relevant for fishing
While many types of ships has been using diesel-electric propulsion for many years now, few fishing vessels have so far gone in this direction.
According to Hallvard L. Slettevoll, CEO of Stadt, a Norwegian company with a thirty-year track record of developing, manufacturing and installing seagoing AC motor drives, process controls and integrated electric propulsion systems, with new regulations limiting the use of heavy fuel oil and more stringent emission regulations kicking in, the environmental thinking is forcing its way in to the entire shipping industry, fishing included.
“A ship with for instance Stadt diesel-electric propulsion, will cope easily with environmental issues,
while also saving fuel. Noise levels will be significantly reduced, and reliable operation brought to a level never seen on fishing vessels with one main engine driving the propeller,” he said.
A solution such as a typical Stadt Lean Propulsion arrangement, consists of four diesel generator sets, or LNG gensets, with no auxiliary generators needed.
“The generators start and stop automatically, as the load demand varies. So at low activity of the ship, only one of the four is running , and this can power every requirement onboard, from galley to propeller,” he said, explaining that all power for the entire vessel goes via a main switchboard, divided in two independent sections.
Two electric motors drive the propeller, providing highly reliable and efficient operation. Each of the two AC motors and their drives have redundant windings and power.
“So this propeller will never stop at sea,” Hallvard Slettevoll said, and commented that this Stadt Lean Propulsion system has so far been delivered to four Norwegian purse seiners and to thirty vessels in other parts of the world.
“The patented Stadt AC Lean Drive technology is free from electromagnetic and acoustic noise, making it very suitable for fishing and research vessels,” he said.
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