SMA SC 500HE-US - Manual (Page 40)

8 Reactive Power Regulation SMA America, LLC
40 SC500HEUS-eng-BE-BUS120320 Operating Manual
8 Reactive Power Regulation
The Sunny Central can supply reactive power if required by the grid operator. The grid operator
defines the procedures and target values used for this.
8.1 Procedure for Reactive Power Regulation
8.1.1 Selecting the Procedure using the Parameter "Q-VArMod"
The parameter "Q-VArMod" is used to select the procedure for reactive power regulation. Use the
parameter to configure how the specifications of the grid operator are to be received and
implemented.
There are eleven different procedures for reactive power regulation. The default value for this
parameter is "Off".
Procedure Description
"Off" The reactive power target value is limited to 0 kVAr.
"VArCtlCom" The reactive power target value is received by the Sunny WebBox via the
Power Reducer Box and forwarded to the Sunny Central. The target value
is transmitted as a percentage and converted to kVAr inside the inverter.
"PFCtlCom" The reactive power target value is received by the Sunny WebBox via the
Power Reducer Box and forwarded to the Sunny Central. A displacement
power factor cos φ is transmitted as a target value.
"VArCnst" The parameter "Q-VAr" is used to set the reactive power target value in
kVAr.
"VArCnstNom" The parameter "Q-VArNom" is used to set the reactive power target value
as a percentage based on "Pmax".
"VArCnstNomAnIn" The reactive power target value is imported through an analog input. The
analog value is converted into a reactive power target value.
"PFCnst" The reactive power target value is set using a displacement power factor
cos φ.
"PFCnstAnIn" The reactive power target value is imported through the analog input for
specifying target values. The analog value is converted into a
displacement power factor cos φ.
"PFCtlW" The displacement power factor cos φ is set depending on the feed-in
capacity. The dependency is depicted by a parameterizable curve.
"VArCtlVol" Reactive power is set depending on the line voltage. The parameterization
of this function depends on the medium voltage.