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Workin g p r inc ip le o f PCU
IsolationTransformer
Bi-directionalInverter
MPPTCharger
LoadKM 1
KM 2
SolarPanel
GridInput
Battery
1. SOLAR PV charging batteries and feeding power to the load. Incase of solar unavailability, load is fed by Battery.
2. If solar not available and battery goes low, inverter connects to thegrid and charges the battery as well as feeds load.
3. If less load, battery fully charged and Solar power is available,excess power can be exported to grid.
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Single Lin e Diagr am fo r PCU
Standard
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Bloc k Diagram
IsolationTransformer
Bi-directionalInverter
MPPTCharger
LoadKM 1
KM 2
SolarPanel
GridInput
Battery
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MPPT (Maxim um Pow er Point Track ing )
MPPT is algorithm that included in charge controllers used forextracting maximum available power from PV module under certainconditions. The voltage at which PV module can produce maximumpower is called maximum power point (or peak power voltage).Maximum power varies with solar radiation, ambient temperature
and solar cell temperature.Typical PV module produces power with maximum power voltage ofaround 17 V when measured at a cell temperature of 25C, it candrop to around 15 V on a very hot day and it can also rise to 18 V ona very cold day.
Contd
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B I-DIRECTIONA L INVERTER
Can be used as both Inverter (during SolarPower available condition) & Converter (duringgrid power condition).
Adding flexibility, at the same time reducing thecomponent of error.
RELIABLE AND COST EFFECTIVE SOLUTION.
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Operational Modes of Liebert ESU
Stand alone mode
Grid Import mode
Grid Export mode
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Liebert ESU - Stand alone mode
- Inverter works on stand alone configuration. AC Grid shall act as
bypass. Inverter will pick up when battery voltage @ 2.05V per cell.
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Liebert ESU - Grid Import mode
- AC CHARGING activates when battery voltage drop 1.9V/Cell(SETTABLE), deactivates when battery voltage reaches 2.3V/Cell.
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Liebert ESU - Grid Export mode
- Battery voltage at 2.4V/Cell & AC input status is ok, Export to GRID starts.
STOPS when V goes below Battery float voltage level (2.2V/cell). The
reference rate value can be decided by Grid Export Step & Grid Export
Time.
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SOLA R GRID CONNECTINVERTER
OR
ON GRID SYSTEM
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Block diagram of Liebert EEU upto 250KW
IsolationTransformer
Inverter
K2SolarPanels
K1
Grid Connect Inverter Combiner
To Grid
(optional)
Liebert EEU /
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Single Line Diagram for GCI
