The combination of a UPS (Uninterruptible Power Supply) and a generator
set is an increasingly frequent solution used to supply sensitive loads such
as computers, telecommunication centres, industrial processes, hospitals,
airports, etc. These two types of equipment offer complementary functions
for the supply of critical loads.
A UPS uses the double-conversion technique (rectifier/charger and inverter)
to provide quality power and isolate loads from upstream disturbances. It
also supplies battery backup power that can last from a few minutes up to
several hours.
However, the longer the necessary backup time, the larger the battery
installation, with the corresponding servicing requirements. For this reason,
gensets are used to reduce the size of the battery in installations requiring
long backup times. In the event of a prolonged utility power outage, the
genset is started to supply the UPS before battery power runs out.
Note however that a number of operating constraints weigh on gensets
(start-up time, regulation, minimum operating times, etc.), in addition to
installation and maintenance costs (fuel storage, special room, servicing,
etc.).
What is more, use with a UPS involves a number of technical aspects that
must be examined to ensure correct operation of the assembly.
To ensure cost-effective operation, the UPS-genset combination must
designed to ensure optimum economic conditions and compatibility of the
technical characteristics.
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