Page 72: of Maritime Reporter Magazine (November 2015)

WORKBOAT ANNUAL

HYBRID POWER

Power storage: The battery placed amidships, aft of the the gen sets.

Illustration: Salt Ship Design at really low loads 70 percent of the time expertise of the one, the engine know- of having the battery in standby mode. In a cheaper vessel. In all-electric hybrid — and seeing how little time it spends how of the other — produced system other tests, the battery is given the peak systems, mechanical power from the doing high-load ship-assist, Lindtjorn’s analysis that included emissions tests shaving and power-enhancement role in engines converts to electrical current for frustration simmers. mirroring tug operations. support of the motor, and then, ? nally, propulsion and other onboard consum- “It’s ludicrous to be dimensioning your Connecting generator to recti? er and the engine is deliberately tripped (be- ers. “So the generator now operates at engine for this (tiny need for) full pow- (a motor), they simulated load pro? les. cause in reality it’s often at fault). a constant load, and the stable pressures er, when you could have other energy They connected a battery (up against Measurements clearly showed that and heat mean that everything in your sources cover that peak load for short a supercapacitor at the other end of a with the battery turned off, variable engine works better. The battery doesn’t periods in a more ef? cient way.” switchable circuit). The super-capacitors speed operation puts the full load on a mind (sharing the load),” says Lindtjorn, — good for repetitive, high-power use generator. Translation: pricy gen-set explaining that battery power on an AC

Telling Tests — proved not to have the ? exibility of maintenance. When on, the battery system forces the use of more electric

It isn’t just commentary. He’s relaying the battery. “We’ve seen that the battery takes the full change in load (instead). It (transformers) and electronic hardware. the results of tests at a lab in Trondheim, is the go-to solution if you have slightly means designers can choose smaller gen “A DC grid solution is more streamlined where cooperation between ABB and longer durations of any type, where you sets of fewer cylinders and less output. for energy storage,” he says, although

Marintek — the electrical and control need a little extra energy,” Lindtjorn says For owners, it means extra space and this writer knows AC proponents in

Heave-compensated: Cranes on deck that can add battery power.

72 Maritime Reporter & Engineering News • NOVEMBER 2015

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