Operating Principle - ABB HiPerGuard MV UPS User Manual

3.2.

Operating principle

The HiPerGuard MV UPS has two modes of operation.
In the Power Conditioning mode, the MV UPS supplies continuously regulated voltage, irrespective of
utility conditions. The high-performance power electronic inverters ensure that the output voltage is
regulated for combinations of input supply voltage disturbances.
In the Independent mode, the MV UPS opens the input circuit breaker and provides all the load
requirements from the energy storage.
3.2.1. Power Conditioning mode
During the Power Conditioning mode, the power converters can control the real and reactive power from
the utility to the load, without cycling the energy storage.
At the same time, the HiPerGuard MV UPS is continuously conditioning and filtering any utility
disturbances, providing reactive current support to the critical loads in voltage sag or swell events.
The resulting performance is continuous clean power in accordance with IEC62040-3 VI SS 111.
The efficiency is greater than 98% for the load spectrum from 50% up to rated full load. When operating
on the Power Conditioning mode, the HiPerGuard MV UPS can supply high fault currents for downstream
protection.
Figure 3.2: HiPerGuard MV UPS Power Conditioning mode
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