SMA SC 500CP-US-10 600V - Manual (Page 65)

SMA America, LLC 8 Reactive Power Control
Operating Manual SCCP-US-BE-US_en-52 65
8.3 Q at Night
8.3.1 Selecting the Mode with the Parameter QoDQ-VarMod
The inverter can supply reactive power in the "Q at Night" operating state if required by the grid operator.
The grid operator defines the modes and setpoints used for this. The settings for the "Q at Night" operating state are
independent from normal feed-in operation.
You can set the mode for reactive power control via the parameter QoDQ-VArMod. Use this parameter to configure
how the specifications of the grid operator are to be received and implemented.
There are seven different modes for reactive power control. The default value for this parameter is Off.
Procedure:
1. Ensure that the inverter is in the operating state "Stop".
2. Log in to the user interface.
3. Enter the password in the appropriate field on the homepage and confirm with [Login].
4. Change the parameter QoDQ-VArMod (see Section 6.2, page 51).
5. Change parameters associated with the selected mode.
6. You can select the desired behavior in the absence of setpoint specifications in the parameter PwrMonErrMod as
follows:
Mode Description
Off The reactive power setpoint is limited to 0 kVAr.
VArCtlCom The SC-COM receives the reactive power setpoint via Modbus and transmits it to the inverter.
VArCnst The parameter QoDQ-VAr is used to set the reactive power setpoint in kVAr.
VArCnstNom The parameter QoDQ-VArNom is used to set the reactive power setpoint as a percentage
relative to Pmax.
VArCnstNomAnIn The reactive power setpoint is imported via an analog input. The analog value is converted into a
reactive power setpoint.
VArCtlVol The reactive power is configured as a function of the line voltage.
VArCtlVolHystDb The provision of reactive power helps perform voltage-stabilizing measures in the event of
overvoltage or undervoltage. The parameterization is carried out by means of a reactive power/
voltage characteristic curve.
VArCtlVolHysDbA
(for Italy)
Parameter block
The parameter QoDQ-VarMod can only be changed in the operating state "Stop". The entry will not be accepted
in any other operating state.
Validity of parameters in feed-in operation and in Q at Night operation
The parameters used for this proxy value are also valid in feed-in operation and in Q at Night operation.
• Ensure that the settings of the parameters for the proxy values meet the requirements for feed-in and Q at Night
operation.
Setting Description
LastVal If specified via communication: utilization of the last received value. In case of analog
setpoints: utilization of the last valid mean value