SMA SC 500HE-20 - Manual (Page 46)

6 Setpoint for Active Power and Reactive Power SMA Solar Technology AG
46 SCxxxHE-20-BE-BEN111210 Operating Manual
6.1.11 Displaying the Status of the Active Power Limitation
The "P-WModStt" spot value displays the status of the active power limitation.
Displaying the "P-WModStt" spot Value
• Display the spot value of the "P-WModStt" channel on the SC-COM interface (see section
5.1 "Displaying Spot Values", page 34).
6.2 Reactive Power Regulation
6.2.1 Procedure for Regulating Reactive Power
The Sunny Central can supply reactive power if required by the distribution grid operator. The
distribution grid operator defines the used procedures and target values for this.
The "Q-VArMod" parameter is used to select the procedure for regulating reactive power. You use
the parameter to configure how the utility operator's parameters should be received and
implemented.
There are 11 different procedures for regulating reactive power:
Used parameters P-HzStr
P-HzStop
P-WGra
Display Description
Off No procedure for limiting active power has been chosen.
WMax Active power is limited by the specified maximum limit. This limit is based on Pmax.
Hz Active power is limited by a frequency increase.
Tmp Active power is limited due to temperature derating.
AmpPv Active power is limited via PV power limitation.
Procedure Description
Off The reactive power target value is limited to 0 kVAr.
VArCtlCom The reactive power target value is received by the SC-COM through the
Power Reducer Box and forwarded to the Sunny Central.
PFCtlCom The reactive power target value is received by the SC-COM through the
Power Reducer Box and forwarded to the Sunny Central. A power factor
is transmitted as a target value.
VArCnst The "Q-VAr" parameter is used to set the reactive power target value
(in kVAr).