SMA Sunny Island 5048 - Frequency Shift Power Control (FSPC)

SMA Technologie AG Sunny Boy
Technical Description SI5048-11:EE4206 Page 119
This completes the stand-alone grid parameter settings for the Sunny Boy.
16.3 Frequency Shift Power Control (FSPC)
This section describes the operating principles of the "power adjustment via frequency"
(Frequency Shift Power Control - FSPC).
If Sunny Boy inverters are connected to the AC side of the stand-alone grid, the Sunny
Island 5048 must be able to limit their output power. This situation can occur when
(e.g.) the Sunny Island 5048 battery is fully charged and the (solar) power available
from the PV generator exceeds the power required by the connected loads.
To prevent the excess energy from overcharging the battery, the Sunny Island 5048
recognizes this situation and changes the frequency at the AC output. This frequency
adjustment is analyzed by the Sunny Boy. As soon as the grid frequency increases
beyond the value specified by "Fac-Start delta" the Sunny Boy limits its output power
accordingly.
This function is shown in the following figure:
3 Uac-Max V 260
4Fac-delta-
lower range in which the Sunny Boy is active relative
to f
0
Hz –4.5 (starting from the
base frequency f
0
)
5Fac-max+
upper range in which the Sunny Boy is active relative
to f
0
Hz +4.5 (starting from the
base frequency f
0
)
6dFac-Max
max. rate of change
Hz/s 4
7Fac-start delta
frequency increase in relation to f
0
, at which point the
power adjustment via frequency begins
Hz 1 (starting from the base
frequency f
0
)
8 Fac-Limit delta
frequency increase in relation to f
0
, at which point the
power adjustment via frequency ends. The output of
the Sunny Boy at this point is 0 W.
Hz 2 (starting from the base
frequency f
0
)
If Sunny Boy inverters are operated together with Sunny Island 5048 devices on
a communication bus, the "#270.06 ComBaud" parameter in the Sunny Island
5048 devices must be set to "1200" (default).
The Sunny Island 5048 only communicates through the SMA-Net protocol, Sunny-
Net is not supported.
No. Parameters Short descr. Value