IEEE Electrification Magazine - September 2017 - 30

Onboard

G1

G2

~

~
=

=
Bus D1

=

=
~

Bus D2

=
~

M1

=
=

Battery

=
=

=
~

~

M2

Battery

Conventional Plug-Based Charging

Inductive Charging
Receiving

Onshore
22 kVac

Sending

~

Main Grid
~

=

=

~

=

Battery

Figure 9. A typical onboard configuration of a plug-in hybrid vessel with a dc distribution system charged from an onshore system with a local
energy storage. The figure indicates two options for charging: by conventional plug-based connections and by wireless inductive charging.

an onshore installation with a local energy storage is
shown in Figure 9. As a point of reference, the conventional plug-based charging option is also included in the
system configuration.
Since conventional plug-based charging will be based
on grid-frequency ac connections, it will usually be necessary with a dedicated onboard transformer, which has a
significant weight, for ensuring galvanic isolation, as
shown in the left part of Figure 9. With wireless charging,
galvanic isolation is inherently ensured by the inductive
coupling. Considering a case where a large part of the
charging power should come from the onshore energy
storage system, the inductive charging system will not
require any additional conversion stages compared to the
conventional plug-based charging. Indeed, transferring
power from the dc-link of the battery storage system to
the ac connection and then to the onboard dc-bus
requires two conversion stages in the same way as the
inductive charging. If the resonant coils and capacitors of

30

I E E E E l e c t r i f i c ati o n M agaz ine / SEPTEMBER 2017

the inductive charging system can be designed with high
efficiency, this implies that there will not be a significant
difference in power losses by utilizing the inductive charging system in such a configuration.
In the case of a strong onshore ac grid, direct charging
without any onshore energy storage will be possible.
In such a situation, the inductive charging will imply two
additional conversion stages (i.e., grid-frequency ac to dc,
and dc to high-frequency ac for the inductive power transfer). However, the improved utilization of the time available for charging and the potentially increased reliability
of the system under harsh operating conditions are expected to compensate for the cost and slightly increased losses resulting from the inductive charging system.

Pilot Installation
The designed system for contactless inductive power
transfer for marine applications will be tested during
2017-2018 on the ferry MS Folgefonn. This ferry operates in



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

IEEE Electrification Magazine - September 2017 - Cover1
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