SMA Solar Technology AG
8 Power Control
User Manual
SCCP-JP-BA-A4-en-12
53
8.2 Reactive Power Control
8.2.1 Mode of Reactive Power Control
8.2.1.1 Selecting the Mode with the Parameter Q
-
VArMod
The Sunny Central can supply reactive power if required by the grid operator. The grid operator specifies the modes and
setpoints to be used.
You can set the mode of reactive power control via the parameter
Q-VArMod
. Use this parameter to configure how the
specifications of the grid operator are to be received and implemented.
There are eleven different modes of reactive power control. The default value for this parameter is
Off
.
If a displacement power factor cos φ of 1 is to be permanently complied with, SMA Solar Technology AG recommends
using the
PFCnst
mode.
ComFail
The
WCtlCom
mode has been selected and the expected signal with a valid active power limit has
been absent for at least five minutes.
Corrective measures:
• Ensure that the Sunny Central and the Power Reducer Box or Power Plant Controller can be
accessed via the Internet.
• Ensure that the Sunny Central and the Power Reducer Box or the Power Plant Controller are
connected correctly.
• Ensure that the cabling between the Sunny Central and Power Reducer Box or the Power Plant
Controller is OK.
AnInFail
The
WCnstNomAnIn
mode has been selected and the value measured at the analog input is less
than 2 mA.
Corrective measures:
• Make sure the signal cable is correctly connected to the analog input.
ComInvalid The
WCtlCom
procedure has been selected and there is invalid content in the power setpoint data.
Corrective measures:
• Ensure that the settings for the power setpoints are correct.
Mode
Description
Off
The reactive power setpoint is limited to 0 kVAr.
VArCtlCom
The reactive power setpoint is received by the SC-COM via the Power Reducer Box or Power Plant
Controller and then transmitted to the Sunny Central.
PFCtlCom
The reactive power setpoint is received by the SC-COM via the Power Reducer Box or Power Plant
Controller and then transmitted to the Sunny Central. A displacement power factor cos φ is
transmitted as the setpoint.
VArCnst
The parameter
Q-VAr
is used to set the reactive power setpoint in kVAr.
VArCnstNom
The parameter
Q-VArNom
is used to set the reactive power setpoint in % relative to
Pmax
.
VArCnstNomAnIn The reactive power setpoint is imported via an analog input. The analog value is converted into a
reactive power setpoint.
PFCnst
The reactive power setpoint is set via a displacement power factor cos φ.
Display
Cause and corrective measure
