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Vertiv - Static UPS Application Design Guidance

Static UPS - IGBT Semi-conductor - Rectifiers - N+1 Redundancy - Inverters

Static UPS systems provide continuous AC power protection by powering the system load through its double-conversion mode which involves rectifier and inverter. This ensures that the voltage and frequency supplied to the system load remain within close tolerances. In the event of a mains failure, the inverter continues to support the system load, drawing its DC power from the system battery. Many developments in technology have recently occurred by using IGBT semi-conductor technology, providing improved efficiency, self-monitoring, touchscreens and modular construction.

By using IGBT rectifiers, Vertiv static UPS systems draw power at near unity power factor. This minimises the input current required for any given load power and enables more real power to be drawn from an AC supply of a given current rating, eliminating the need of upstream system oversizing.

UPS systems are rarely operated at, or near to, full load, therefore the fact that the efficiency of Vertiv static UPS systems is maintained at almost the same high level from 100% load down to as low as 15-20% of system load becomes very significant to the overall running costs.

Vertiv can supply both monolithic and modular three-phase UPS; the latter have the additional benefit of being made of power modules which can be easily paralleled for increased power or for N+1 redundancy.

By using the modular approach, the ‘+1’ is a relatively small capacity enabling a high ratio of load to UPS capacity to be achieved. Modules can be incorporated inside a single cabinet with internal static switches to form 30 kW to more than 3 MW “hot” swappable systems which are able to service units and to update the power without going either to bypass or to shut-down the system.

Vertiv UPS systems with IGBT inverters can support any leading or lagging load power factor and all non-linear computer loads.

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Static UPS

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