IEEE Electrification Magazine - December 2019 - 91

Super
Capacitor

Energy Storage

dc/dc
Bidirectional Converter
B1

Exciter
Control

VSD

Power Generation
Governor
Control 2

Rectifier

Exciter
Control

Braking
Control

G1
dc Bus 440 V

DE1

Propulsion Loads

Breaker 1

Fuel

Bus Tie

Fuel
DE2

G2

Breaker 2
M2

Rectifier

B2

Power and Energy Management

M1
Governor
Control

VSD
Fuel Cell

dc Bus
dc/dc
Unidirectional Converter

Energy Storage

User Interface

Control and Communication Signal
DE

Battery
dc/dc
Bidirectional Converter

G

Diesel Generator

M

Motor Load

B

Braking (Load Emulator)

Figure 2. A single-line diagram of the hybrid power lab based on onboard dc power system.

Capacitors
Battery
Fuel Cells

10,000,000
1,000,000
Power Density (W/kg)

Traditionally, the ac power grid has dominated
marine power plants due to the complexity in the
development of safety components and systems in the
dc power grid. However, dc power grids are becoming
popular due to the fast advancement in the power
electronic technologies and improved safety systems.
The general benefits and the driving factors for adopting dc power grids include improved prime mover's
efficiency; reduction in average fuel consumption; low
overall transmission losses; faster and simpler parallel
connection of generators; and simpler implementation
of ESDs.
Fuel cells, combustion engines, batteries, and supercapacitors are the most common energy carrier solutions
that are in discussion for the hybrid power system. Selection of an energy carrier solution for a marine vessel
depends on the mission of the vessel as well as the characteristics of the energy carriers. Energy density and
power density are a couple of the major characteristics
that are necessary to be considered. A simplified Ragone
plot in Figure 3 shows the range of the power density versus energy density in a log-log scale for different energy

Super Capacitors
Combustion Engine

100,000
10,000
1,000
100
10
1
0.01

0.1

1
10
100 1,000 10,000
Energy Density (Wh/kg)

Figure 3. A simplified Ragone plot showing a range of power density
versus energy densities for different energy carriers, such as sources
and storages.

	

IEEE Elec trific ation Magazine / D EC EM BE R 2 0 1 9

91



IEEE Electrification Magazine - December 2019

Table of Contents for the Digital Edition of IEEE Electrification Magazine - December 2019

Contents
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IEEE Electrification Magazine - December 2019 - Cover3
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https://www.nxtbook.com/nxtbooks/pes/electrification_december2022
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
https://www.nxtbook.com/nxtbooks/pes/electrification_march2021
https://www.nxtbook.com/nxtbooks/pes/electrification_december2020
https://www.nxtbook.com/nxtbooks/pes/electrification_september2020
https://www.nxtbook.com/nxtbooks/pes/electrification_june2020
https://www.nxtbook.com/nxtbooks/pes/electrification_march2020
https://www.nxtbook.com/nxtbooks/pes/electrification_december2019
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
https://www.nxtbook.com/nxtbooks/pes/electrification_march2017
https://www.nxtbook.com/nxtbooks/pes/electrification_june2016
https://www.nxtbook.com/nxtbooks/pes/electrification_december2016
https://www.nxtbook.com/nxtbooks/pes/electrification_september2016
https://www.nxtbook.com/nxtbooks/pes/electrification_december2015
https://www.nxtbook.com/nxtbooks/pes/electrification_march2016
https://www.nxtbook.com/nxtbooks/pes/electrification_march2015
https://www.nxtbook.com/nxtbooks/pes/electrification_june2015
https://www.nxtbook.com/nxtbooks/pes/electrification_september2015
https://www.nxtbook.com/nxtbooks/pes/electrification_march2014
https://www.nxtbook.com/nxtbooks/pes/electrification_june2014
https://www.nxtbook.com/nxtbooks/pes/electrification_september2014
https://www.nxtbook.com/nxtbooks/pes/electrification_december2014
https://www.nxtbook.com/nxtbooks/pes/electrification_december2013
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