Energy Storage Description; Pcs100 Inverter Fast Charging; Float Charger - ABB PCS100 UPS-I User Manual

PCS100 UPS-I User Manual

9.4 Energy Storage Description

Energy Storage charging functionality is the part of the system that replenishes the energy consumed from the
energy storage after the system operates, as well as the initial charge (from 0 V) of Ultracapacitor strings.
Two methods of charging are provided with PCS100 UPS-I system:

PCS100 Inverter fast charging

–

Float Charger

–
9.4.1 PCS100 Inverter fast charging
Due to bi-directional power flow design of the PCS100 Inverters high power PCS100 Inverter fast charging is
implemented in the PCS100 UPS-I system. The PCS100 Inverters send power from the utility supply to replenish
the Energy Storage following any significant discharge operation.
Once the PCS100 UPS-I is On Line the PCS100 Inverter fast charging will charge energy storage from 554 V to the
maximum storage voltage.
Charging time of the PCS100 Inverter fast charging is dependent on the settings of the charging current through
the parameter 711 Charging Current. Charging current level during PCS100 Inverter fast charging period can be
set between 0% and 40% of inverter rated current, with standard setting of 10% for battery models and 20% for
Ultracapacitor models.
Note:
During complete electrical system design precaution should be taken for the PCS100 UPS-I system supply
transformer capacity, especially for battery models because of the battery charging period after PCS100 UPS-I
discharging mode.
As fast charging of batteries through the PCS100 UPS-I inverters can be up to 30 minutes. The additional load on
the supply transformer should be taken in consideration.
Typical recharging times are shown in Table 9-1.
Energy System Type
Storage
Ultracapacitor 0.8 PF, 20% charging
current
1.0 PF, 20% charging
current
Battery 0.8 PF, 10% charging
current
9.4.2 Float Charger
Once the energy storage is largely recharged, the PCS100 Inverter fast charging is turned off and the Float
Charger is left to provide fine control and efficient floating.
The Float Charger is an independent isolated switch mode charger rated 1.5 kW + 1.5 kW, 4 A, for +/- 375 Vdc
(Ultracapacitors) and +/- 390 Vdc (batteries) supplies.
Additional function of the Float Charger is initial charging of Ultracapacitor Energy Storage, from 0 V to 650 V,
after the PCS100 UPS-I is powered up and before the PCS100 UPS-I can Run (On Line). Once the PCS100 UPS-I is
On Line the PCS100 Inverter fast charging will charge from 650 V to the maximum storage voltage.
Note:
Note
Discharged with 10% - 100% of rated
load power
Discharged with <10% of rated load
power
Discharged with 10% - 100% of rated
load power
Discharged with <10% of rated load
power
Discharged with 0% - 100% of rated
load power
Table 9-1: Typical PCS100 UPS-I Energy Storage recharging times.
Voltage Recharge time
range
630 - 750 V 16 – 18
seconds
560 - 750 V 30 – 32
seconds
630 - 750 V 20 - 23
seconds
560 - 750 V 37 - 40
seconds
554 - 780 V up to 30
minutes
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