IEEE Electrification Magazine - June 2015 - 23
suggested to increase fuel economy and ensure reliability at
the same time. Furthermore, an active front-end (AFE) converter can provide improved grid quality at transient states
such as fault and future mission load in addition to steady
state as with normal sea sailing.
The Advantages of an IPS
for naval Surface Ships
Before the ship IPS was introduced, most naval surface
ships employed a conventional power system with a typical
structure that is shown in Figure 1(a). This conventional
power system has two subsystems. One subsystem is for
ship propulsion with prime movers, reduction gears, long
shafts, and propellers. The propulsion power supplied from
the prime movers flows through mechanically connected
reduction gears and shafts and finally to the propellers. The
usual prime mover sets consist of diesel engines (DEs) and/
or gas turbines (GTs) whose configurations vary according
to the role of the ship and other issues such as cost and
space. A series of reduction gears appropriately slow down
the propeller shaft from a relatively high engine shaft while
transferring propulsion power. The other subsystem is for
ship service loads whose power supply comes from the
engine-generator sets. The engines of each subsystem can
be used only for their respective purpose since each is
physically separated from the other. This typical separated
configuration has been used to secure maneuverability,
which locks almost 90% of the available power into the propulsion system. However, this exclusive use of the power
supply only to the propulsion system can be a disadvantage, as the power is not available for other mission loads.
The electric mission loads becomes essential like the
maneuverability, but its power demand cannot be met with
conventional ship service load supplies.
As an alternative to the conventional power system,
the ship IPS was introduced. It has multiple integrated
IEEE Electrific ation Magazine / j une 2 0 1 5
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Table of Contents for the Digital Edition of IEEE Electrification Magazine - June 2015
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https://www.nxtbook.com/nxtbooks/pes/electrification_september2022
https://www.nxtbook.com/nxtbooks/pes/electrification_june2022
https://www.nxtbook.com/nxtbooks/pes/electrification_march2022
https://www.nxtbook.com/nxtbooks/pes/electrification_december2021
https://www.nxtbook.com/nxtbooks/pes/electrification_september2021
https://www.nxtbook.com/nxtbooks/pes/electrification_june2021
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https://www.nxtbook.com/nxtbooks/pes/electrification_december2020
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https://www.nxtbook.com/nxtbooks/pes/electrification_june2020
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https://www.nxtbook.com/nxtbooks/pes/electrification_september2019
https://www.nxtbook.com/nxtbooks/pes/electrification_june2019
https://www.nxtbook.com/nxtbooks/pes/electrification_march2019
https://www.nxtbook.com/nxtbooks/pes/electrification_december2018
https://www.nxtbook.com/nxtbooks/pes/electrification_september2018
https://www.nxtbook.com/nxtbooks/pes/electrification_june2018
https://www.nxtbook.com/nxtbooks/pes/electrification_december2017
https://www.nxtbook.com/nxtbooks/pes/electrification_september2017
https://www.nxtbook.com/nxtbooks/pes/electrification_march2018
https://www.nxtbook.com/nxtbooks/pes/electrification_june2017
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https://www.nxtbook.com/nxtbooks/pes/electrification_june2015
https://www.nxtbook.com/nxtbooks/pes/electrification_september2015
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https://www.nxtbook.com/nxtbooks/pes/electrification_september2014
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