SMA SC 500CP XT - Manual (Page 39)

Avoiding electromagnetic interference emissions in large-scale PV systems
To avoid electromagnetic interference emissions in large-scale PV systems at the changeover from night mode to
feed-in operation, it is recommended using Modbus communication for setpoint in feed-in operation and night
mode.
For smaller-sized PV systems without farm control, the use of fixed setpoints for reactive power control is
recommended.
Validity of parameters in feed-in operation and in "Q at Night" operation
The parameters used for these substitute values are valid in feed-in operation and in "Q at Night" operation.
• Ensure that the settings of the parameters for the substitute values meet the requirements for feed-in operation
and "Q at Night" operation.
Procedure:
1. Make sure the inverter is in the operating state "Stop".
2. Call up the parameter overview (see Section 9.3.1, page 81).
3. Set the parameter Q-VArMod to the desired value.
4. Change the parameters belonging to the selected mode (see Section 10.3.3, page 96).
5. Use the parameter PwrMonErrMod to select the desired behavior in the absence of setpoint specifications as
follows (see Section 10.3.5, page 110).
6. If SubVal has been selected, enter the substitute values for normal feed-in operation and for operation outside of
normal feed-in operation.
7. In the parameter PwrMonErrTm configure the time lapse until recognition of the absence of setpoint
specifications.
8. Save the parameter changes (see Section 9.3.2, page 81).
4.6.6.5 Setting Q at Night
Operation failure of the PV power plant due to incorrectly set parameters
If the parameter settings for grid management services are incorrect, the PV power plant may not be able to meet the
requirements of the grid operator. This can involve yield losses and the inverter may have to be disconnected by the
grid operator.
• When setting the modes of grid management services, ensure that the control procedures agreed with the grid
operator are parameterized.
• If the inverter is operated with a Power Plant Controller, ensure that the mode WCtlCom for active power
limitation and the mode VArCtlCom for reactive power control are selected in the inverter.
Avoiding electromagnetic interference emissions in large-scale PV systems
To avoid electromagnetic interference emissions in large-scale PV systems at the changeover from night mode to
feed-in operation, it is recommended using Modbus communication for setpoint in feed-in operation and night
mode.
For smaller-sized PV systems without farm control, the use of fixed setpoints for reactive power control is
recommended.
Validity of parameters in feed-in operation and in "Q at Night" operation
The parameters used for these substitute values are valid in feed-in operation and in "Q at Night" operation.
• Ensure that the settings of the parameters for the substitute values meet the requirements for feed-in operation
and "Q at Night" operation.
4 Commissioning SMA Solar Technology AG
User Manual 39 SCCPXT-BA-E4-en-54