IEEE Electrification - June 2021 - 8

TECHNOLOGY LEADERS
The MTB dc-dc
converter presents a
clear advantage to
reducing the cost and
increasing power
density when, for
instance, considering
the particular
application where
multiple dc sources.
efficiency, apart from the FPPC,
the concept of partial-power-processing
converter (PPPC) topologies
(see Figure 3) has been proposed
to arrange an energy source as a
series or a parallel element with
the load, allowing only a fraction
of the total power to be transferred
through the converter
(Hoffmann et al. 2021; Liserre
2021). Consequently, the power
losses might be reduced, leading
to higher power density and efficiency
(increasing it up to 1.9%).
Moreover, the reduced rating of
the power converter might also
provide an extra cost reduction
(around 25% when compared to
the conventional triple active
bridge) (Hoffmann et al. 2021).
However, it should be mentioned,
that the feature off galvanic
isolation is lost. As a
consequence, PPPCs have many
beneficial characteristics for
integrating a battery storage system
when galvanic isolation is
not required.
Systems-Oriented Design
by Specialized Software
Packages
Accurate simulation models allow
the optimization of the electrical
systems in an effective way and
hence reduce validation costs and
development efforts and improve
reliability. For modeling and simulating
the overall power electronic
system (electric, thermal, and
8
IEEE Electrification Magazine / JUNE 2021
EV Station
MVac
Power Flow
LFT
ac
dc
Power Flow
dc
ac
SuperCap
Power Flow
dc
ac
Storage
Passive and Semi-Active
Topologies for Unidirectional or
Partial-Bidirectional Power Flow
(a)
ac
ac
dc
ac
dc
dc
ac
MWT
(b)
Figure 2. (a) A hybrid MTB dc-dc converter based on the unidirectional topology FWR, and (b) smart transformer-based solutions with direct MV connection employing an MTB dc-dc converter along
with an LVDC connection for storage integration.
ac
dc
dc
Storage
dc
ac
MWT
ac
dc
dc
PV System
Power Flow
ac
ac
dc
EV System
Power Flow
MWT
ac
dc
dc
ac
ac
dc
EV Station
dc
dc
MWT
EV Station
ac
ac
Power Flow
ac
dc
ac
dc

IEEE Electrification - June 2021

Table of Contents for the Digital Edition of IEEE Electrification - June 2021

Contents
IEEE Electrification - June 2021 - Cover1
IEEE Electrification - June 2021 - Cover2
IEEE Electrification - June 2021 - Contents
IEEE Electrification - June 2021 - 2
IEEE Electrification - June 2021 - 3
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