IEEE Electrification Magazine - September 2013 - 32

By Rich Schmerda, Rob Cuzner,
Rodney Clark, Dan Nowak,
and Steve Bunzel

Shipboard Solid-State
Protection
HIPBOARD ELECTRICAL SYSTEMS INCREASINGLY USE
dc distribution as an integral part of low-voltage (LV) ship
service power for direct connection of variable-frequency
drives (VFDs) and other mission loads to a dc feed, eliminating space and weight overhead of front-end ac/dc
conversion. The future shipboard systems will have many of the same
characteristics and requirements as dc microgrids because they will
allow multiple generating sources and loads to interface into a common
bus. An overriding consideration for shipboard systems is survivability.
So dc systems have the advantage because they can readily interface
with energy storage systems, and they are able to connect redundant
buses through auctioneering diodes. The vision for power transmission from generation to electrical zones on future shipboard systems
is leaning toward medium-voltage dc (MVDC) systems.
Key design criteria for fault protection on any such system are
predictability of the system response to faults, the speed at which
the fault is removed from the system, and the continuity of service to the loads. As with any electrical distribution system, shipboard dc systems are architected so that faults can be isolated
between electrical zones and within a zone. Off-the-shelf solutions that meet these objectives are limited. This has motivated
much research in the development and use of solid-state protective devices (SSPDs). In addition, new paradigms for fault
protection are needed where SSPDs are applied. This article provides an overview of the present art of dc protection using
SSPDs, including integrated gate-commutated thyristor (IGCT)
versus insulated-gate bipolar transistor (IGBT) solutions, for LV
and MVDC systems. This article also demonstrates a means of
achieving protective coordination between upstream and downstream SSPDs. Experimental results are provided, showing coordination between one IGBT-based and two IGCT-based SSPDs.

S

Zonal electrical Distribution and protection
The dc zonal electrical distribution system (dc ZEDS) concept uses a
static switch to isolate faulted section(s) of a dc bus that extends

Digital Object Identifier 10.1109/MELE.2013.2273395
Date of publication: 23 October 2013

32

I E E E E l e c t r i f i catio n Magaz ine / september 2013

PORTHOLE © CAN STOCK PHOTO/LINA0486

2325-5987/13/$31.00©2013IEEE



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