SMA FLEXIBLE STORAGE SYSTEM - Manual (Page 17)

SMA Solar Technology AG 7 Changing the Configuration of the PV Inverters
Installation Manual FSS-UK-IA-en-20 17
7 Changing the Configuration of the PV Inverters
In battery-backup systems, the active power of the PV inverters should be controllable depending on the frequency (see
the Planning Guidelines "SMA Flexible Storage System with Battery-Backup Function"). If your grid operator prohibits the
reduction of active power feed-in in case of overfrequency, you can also use the PV inverters without changing the
configuration. SMA Solar Technology AG recommends activating the frequency-dependent control of the PV inverters.
Requirements:
☐ The PV inverters are part of a battery-backup system and the automatic transfer switch can disconnect the PV inverters
from the utility grid.
☐ The grid operator must be informed of the configuration change and have no objections to it.
☐ You must be authorized to change Grid Guard parameters. You can find the application form at
www.SMA-Solar.com in the download area of the relevant PV inverter.
☐ The firmware version of the PV inverters must support the frequency-dependent control of active power (for "PV
inverters", see the Planning Guidelines "SMA Flexible Storage System with Battery-Backup Function" at
www.SMA-Solar.com).
Procedure:
1. With existing PV systems, make sure that the firmware of the installed PV inverters supports frequency-dependent
active power reduction (see the Planning Guidelines "SMA Flexible Storage System with Battery-Backup Function"
at www.SMA-Solar.com).
2. Set the following parameters of the PV inverters to the specified value (see the documentation of the communication
product).
Parameter Value
P-WCtlHzMod
Operating mode of active power reduction in case of overfrequency P(f)*
* Menu Equipment & device control system
On or WCtlHz
P-WGra
Active power gradient, linear instantaneous power gradient configuration* 40
P-HzStr
Difference between starting frequency and grid frequency, linear instantaneous power
gradient configuration*
0.2
P-HzStop
Difference between reset frequency and grid frequency, linear instantaneous power gradient
configuration*
0.2
P-HzStopWGra
Active power gradient after reset frequency, linear instantaneous power gradient
configuration*
10