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The Benefits of Today's Parallel UPS Systems
What is Parallel Architecture?
UPS systems are described as having parallel architecture if they have:
- Multiple UPS modules operating in parallel to feed a common critical load bus
- One or more static switches, which, depending on UPS status and load conditions, switch the critical load to the common critical load bus, or the raw AC mains supply
UPS modules are paralleled to match the capacity (or power rating) of the UPS system to the size of the critical load or to increase the availability of the UPS system, by introducing module redundancy.
Today's Parallel Architecture
Early implementations of parallel-redundant UPS systems required system managers to assign individual UPS modules to either 'capacity' or 'redundancy' roles. The UPS community introduced terminology to describe parallel-redundant UPS systems:
- 'N+n' parallel-redundant UPS system, where 'N' is the Coefficient of Capacity, and 'n' is the Coefficient of Redundancy
In modern parallel-redundant UPS systems, adjustments to the coefficients of capacity and redundancy are made automatically in response to the prevailing critical load. That system function has a concise objective for the UPS system as a whole "Redundancy if it can be, capacity if it has to be!"
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