I-V Characteristics; Dual Supply Mode - ABB ACS355 Manual

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I-V characteristics

10
8
6
Iact
n
Pkw
n
4
2
0
200
The I-V curve is not constant since intensity and temperature changes during day time.
Under constant temperature, current changes linearly with intensity and voltage changes
logarithmically with intensity. Since the voltage variation is small with respect to intensity
changes, maximum power varies proportionally with intensity.

Dual supply mode

The solar pump inverter operates in dual supply mode either with a three phase input
supply from the grid or with DC input supply from PV cells. A four-pole changeover switch
enables switching between the two supply modes. At a given time only one supply (PV cell
or grid) will be connected to the drive.
Grid supply
PV cell ce
Note: Use two poles of the changeover switch in series to ensure that the voltage applied
across each pole is half of the full DC voltage.
600 800
400
Vpv
n
4-pole change
over switch
To inverter U1, V1, W1
To inverter (Brk+, Brk-)
Operating principle and hardware description 17
Solar pump
inverter
Motor and
Pump