SMA SC 500CP-US-10 600V - Manual (Page 56)

8 Reactive Power Control SMA America, LLC
56 SCCP-US-BE-US_en-52 Operating Manual
8 Reactive Power Control
The inverter can supply reactive power if required by the grid operator. The grid operator defines the procedures and
setpoints used for this.
8.1 Selecting Reactive Power Control Procedure with the Parameter
Q-VArMod
You can set the procedure for reactive power regulation via the parameter Q-VArMod. 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 setting for this parameter is Off.
/05*$&
Operation failure of the inverter due to incorrectly set parameters
If the parameter settings for grid management services are incorrect, the inverter may not be able to meet the grid
management requirements. This may lead to yield losses and disconnection of the inverter by the grid operator.
• When setting the mode of grid management services, ensure that the control procedures are parameterized as
agreed with the grid operator.
•
Procedure Description
Off The reactive power setpoint is limited to 0 kVAr.
VArCtlCom The reactive power target value is received by the SC-COM via Modbus and then transmitted to
the inverter.
The target value is transmitted as a percentage.
PFCtlCom The reactive power target value is received by the SC-COM via Modbus and then transmitted to
the inverter. A displacement power factor cos φ is transmitted as a 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 as a percentage based on
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 target value is set using a displacement power factor cos φ.
PFCnstAnIn The reactive power setpoint is imported via the analog input for the setpoint. 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 power. The dependency is
depicted by a parameterizable characteristic curve.
VArCtlVol Reactive power is set depending on the line voltage. The parameterization of this function is
based on the medium voltage.
VArCtlVolHystDb The supply of reactive power helps perform voltage-stabilizing measures in the event of
overvoltage or undervoltage. The parameterization is performed using a reactive power/voltage
characteristic curve.
VArCtlVolHysDbA 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 and an activation power.