Power Electronics SD700SP Series, Hardware And Installation Manual

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POWER ELECTRONICS SD700SP
DC CONFIGUATION LIMITS
15
EN
DC CONFIGUATION LIMITS
The following definitions are technical characteristics of the photovoltaic panel:
•
Isc: maximum current obtained by short-circuiting the two terminals (positive and negative) of the
module. During the short circuit the voltage between terminals is 0V.
•
Voc: voltage obtained by leaving the two terminals of the module opened. It is the maximum
produced by the module when there is no current flowing.
•
Impp: Maximum current of the photovoltaic module for certain conditions (radiation, temperature).
•
Vmpp: Maximum voltage of the photovoltaic module for certain conditions (radiation,
temperature).
•
Pmpp: Maximum power of the photovoltaic module for certain radation and temperature
conditions. It is characterized by a voltage at the point of maximum power Vmpp, and by the Impp
current.
For a correct photovoltaic solar field design is necessary knowing the minimum and maximum continuous
DC input voltages we can supply the SD700SP:
Maximum DC Voltage Minimum DC voltage
▪
Voc < 850V
DC
Frames 1-2
▪
Voc < 900V
DC
Frames 3-8
▪
V
MPP
> √2 · V
AC
motor
(All frames)
Example: for a 400V
AC
input installation: Vmin= V
MPP
> √2 · V
AC
(400V) = 565V
DC
The maximum and minimum number of photovoltaic modules in series is determined by the minimum and
maximum continuous input voltages of the variable speed drive and by the rating voltages of the module
used in the photovoltaic field. It will depend on the temperature and radiation conditions of the location.
The maximum number in parallel is determined by the installation power, which maximum must be two
times the variable speed drive power, for heavy duty operating conditions at 50ºC.
For designing the photovoltaic field, we recommend:
•
For pressure regulation instalations: 2 times the rated power of the variable speed drive, heavy
duty operation.
•
For raft pumping installations: 1,5 times the power of the variable speed drive, heavy duty
operation.
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