IEEE Electrification Magazine - June 2020 - 36
The full-bridge isolated converters can enjoy soft-switching operation, reducing the switching power loss and, as a
result, increasing efficiency. The galvanic isolation, which
can protect FCs in overload conditions and high voltage
gain, is the most attractive advantage of full-bridge isolated converters.
In the dc-dc converter, the insulated-gate bipolar transistor or MOSFET switches produce an intermediate ac
signal, a three-level square-wave voltage, for the primary
side of the high-frequency transformer. At the end, a dc-
ac converter is employed to interface the ac grid to dc link.
It is worthwhile to mention that the ESS should be
Local Converters
LC
+
FC
The efficiency of an energy conversion process is one of the
most important aspects of that conversion. The FC efficiency depends on both thermodynamic performance and electrical efficiency, and it is defined as the ratio between the
electricity generated by an FC and the consumed hydrogen
as a fuel. The electrical efficiency depends on several losses,
including ohmic, activation, and concentration losses.
dc Bus
CC
dc-ac Stage
Electric Propulsion
Cdc
RC
+
ESS
Efficiency
RC
-
LC
recharged or discharged, so the power flow from the ESS
to FC or grid is bidirectional. In contrast, the converter
connected to the FC must be unidirectional.
CC
-
Figure 11. An electrical diagram of the power system integration of the FC with parallel ESS.
Local Converters
FC
Transformer
ac-dc Stage
dc Bus
dc-ac Stage
L1
+
N1
-
L2
N2
ESS
+
-
Cdc
L3
N3
Figure 12. An electrical diagram of the power system integration of the FC with integrated ESS.
36
I E E E E l e c t r i f i cati o n M agaz ine / J UN E 2020
Electric
Propulsion
IEEE Electrification Magazine - June 2020
Table of Contents for the Digital Edition of IEEE Electrification Magazine - June 2020
Contents
IEEE Electrification Magazine - June 2020 - Cover1
IEEE Electrification Magazine - June 2020 - Cover2
IEEE Electrification Magazine - June 2020 - Contents
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