ABB HiPerGuard MV UPS User Manual page 29

Figure 3.10: MV UPS power flow – Power Exchanger function disabled. P
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
battery. The HiPerGuard MV UPS system supplies power P
supplies the difference between UPS output and load power. In case the power demanded by the load
(P ) is the same power available from the Power Exchanger (P
Load
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
If the demanded power P
equal to P . P <=P
Load PE Load
HI PE RG UA RD M V UP S U S E R M A N UA L
exceeds the load power, then the HiPerGuard MV UPS shall limit the P
PE
P RO DU C T D ES C R IP T I ON
= 0
PE
>0), the MV UPS will discharge the
PE
as demanded by the DRC while the grid
PE
), the full load power is supplied by the
PE
< P
PE Load
to be
PE
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