IEEE Electrification Magazine - September 2017 - 55

By Antonino Riccobono, Marco Cupelli,
Antonello Monti, Enrico Santi, Tomi Roinila,
Hessamaldin Abdollahi, Silvia Arrua, and Roger A. Dougal

Stability of
Shipboard dc
Power Distribution
Online impedance-based systems methods.

COURTESY OF U.S. NAVY VIDEO BY MASS COMMUNICATION SPECIALIST 2ND CLASS DIANA QUINLAN/RELEASED

ANY MODERN COMMERCIAL SHIPS ARE
electric ships, i.e., they utilize integrated
electric propulsion (IEP), where electric
motors with variable speed drives are used
for ship propulsion. This provides a number of advantages, such as reduced size and weight, electric power availability aboard the ship, reduced vibration,
and more flexibility in generation engine placement by
eliminating the mechanical connection between engines
and propulsion. Most cruise ships, many yachts, and even
cargo ships utilize IEP. There is also significant interest in
IEP for military ships.

M

Digital Object Identifier 10.1109/MELE.2017.2718858
Date of publication: 5 September 2017

2325-5987/17©2017IEEE

Most electric ships utilize an ac integrated shipboard
power system (ISPS), but there has been significant
interest in a dc ISPS for both commercial and military
ships. The main advantage of a dc ISPS is that the generators are not required to operate at a constant speed
and in synchrony, as is the case for ac generation. The
ability to operate at variable speed allows the optimization of generation efficiency and minimizes fuel
consumption. This is particularly important in the case
of gas turbine generators that operate efficiently only
in a narrow range close to full power and is somewhat less important in the case of diesel generators.
Other advantages of a dc ISPS are reduced vibration,
easy integration of new energy sources and energy storage technologies, and more flexible placement
of components.
IEEE Electrific ation Magazine / S EP T EM BE R 2 0 1 7

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Table of Contents for the Digital Edition of IEEE Electrification Magazine - September 2017

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IEEE Electrification Magazine - September 2017 - Cover3
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