IEEE Electrification - September 2020 - 32

higher power ratings. The common building block of the
power electronic circuit can also be housed by standardized converter cubicles, which are located adjacent to each
other, thus the physical length of the dc bus linking those
converters can be reduced as can the miscellaneous manifolds. The high modularity and scalability of the powerconversion converters for dc bus systems offers
cost-effective solutions for a variety of ships.

the low-voltage ac bus feeds hotel loads via miniature circuit breakers (MCBs). When a short-circuit fault occurs at
one of the loads, its MCB needs a short period of time, normally tens of milliseconds, to disconnect the faulty load.
However, the conventional power electronic converter
trips within 1 ms to protect the power semiconductors
from the fault current. To have fault discrimination, the
hotel load supply converter must provide the fault current
for an adequate period time to allow the MCB to disconnect the faulty load without undermining the power electronic devices of the converter.
A current-clamping technique, as displayed in Figure 4(b), can be adopted for the hotel load supply converter to provide a clamped fault current for a limited
time to enable the MCB to disconnect the faulty load.
Meanwhile, the clamping value and duration are

Hotel Load Supply Converter Short Circuit
Fault Ride-Through
The dc bus IEP system needs dc-ac converters to provide
fixed-voltage, fixed-frequency ac power from the dc bus to
hotel loads such as lighting, air conditioning, and other
onboard loads. The hotel load supply converter needs to
have fault ride-through abilities. As illustrated in Figure 4,

ac/dc

dc/dc

ac/dc

dc/ac
(a)

dc/dc

(b)

Main Propulsion

DG

Solar Power

Azimuth Thruster

Battery Bank

Side Propulsion

Hotel Load

Super Capacitor

(c)
Figure 3. The high modularity, adaptability, and scalability of power electronics-based converters for dc bus systems. The (a) building block,
(b) system, and (c) modular ac-dc and dc-dc converters by using the building block in the dc bus systems.

32

I E E E E l e c t r i f i cati o n M agaz ine / SEPTEMBER 2020



IEEE Electrification - September 2020

Table of Contents for the Digital Edition of IEEE Electrification - September 2020

Contents
IEEE Electrification - September 2020 - Cover1
IEEE Electrification - September 2020 - Cover2
IEEE Electrification - September 2020 - Contents
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