ABB HiPerGuard MV UPS - Page 29

PRODUCT DESCRIPTION
HIPERGUARD MV UPS
USER MANUAL
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Figure 3.10: MV UPS power flow – Power Exchanger function disabled. P
PE
= 0
3.2.7.3.2. Demand to inject power from the battery
If the DRC requests the UPS to inject power from the battery (P
PE
>0), the MV UPS will discharge the
battery. The HiPerGuard MV UPS system supplies power P
PE
as demanded by the DRC while the grid
supplies the difference between UPS output and load power. In case the power demanded by the load
(P
Load
) is the same power available from the Power Exchanger (P
PE
), the full load power is supplied by the
HiPerGuard MV UPS. In this case, the grid power is zero.
Figure 3.11: MV UPS power flow – Demand to inject power from the battery; P
PE
< P
Load
If the demanded power P
PE
exceeds the load power, then the HiPerGuard MV UPS shall limit the P
PE
to be
equal to P
Load
. P
PE
<=P
Load