Page 23
© Copyright 2021 ABB. All rights reserved.
Distributed Architecture
A distributed architecture is best thought of as small systems that are combined together to form a
much larger system (plant). Each small system (cabinet) contains an entire dc power system that
includes ac input, rectifiers, battery connection modules (with external batteries), and dc distribution
modules.
The dc power, generated by the rectifiers and supported by battery strings attached to the cabinet,
will be approximately equal to the dc power distributed to the loads from that cabinet. The dc power
of each cabinet is electrically interconnected so that power may be shared (up to 1800A) between the
cabinets of the plant. This sharing allows the plant to handle imbalances between the individual
cabinet loads (due to improper sizing or to rectifier or battery module failure).
Distributed architecture is summarized as follows: Each cabinet generates and distributes all the dc
power it requires, as a stand-alone “system,” but, also, has additional capacity to share power (feeding
or receiving) with other cabinets within the plant. Growth of the system is accomplished by adding
additional cabinets, with their interconnection hardware, to other cabinets of the plant.
Multiple-cabinet configurations are shown in Figure 4 - 2 (two-cabinet configuration) and Figure 4 - 3
(three-cabinet (or more) configuration).
Note: There are one or more shunts
used in this power system
configuration to monitor the
battery charge ( - polarity) or
discharge ( + polarity) current.
The shunt readings are summed
with the rectifier loads to
determine the plant’s total load
current.
Figure 4 - 2: Two-Cabinet Configuration, Distributed Architecture
To Next Page
Loading...
