SMA INVERTER MANAGER Instrucciones De Instalación página 23

SMA Solar Technology AG / SMA Solar Technology America LLC
5.2.5 Setting Limited Export
Figure 20: LCS-Tool - setting Limited Export
With the Limited Export feature in connection with a
Modbus-capable energy meter, a maximum defined AC
output power can be made available at the grid-connection
point (see figure 22). The total nominal power of all
inverters connected to the Inverter Manager is taken into
account. The inverter is increased or decreased by the
amount of self-consumption to the maximum output power
at the grid-connection point.
The limitation at the grid-connection point is complied with,
while all connected loads can still be supplied with energy
from the inverters.
The maximum setpoint of the nominal PV system power can
be assigned with static or dynamic attributes:
• Assignment of static attributes:
Set the parameter Active Power (P_ref) for the active
power limitation in menu Inverter Parameter under
Protection settings > Support settings >
Immediate controls (see Section 5.2.6 "Changing of
Inverter Parameters", page 26).
• Assignment of dynamic attributes:
In addition, the setpoint of the nominal PV system
power can be limited dynamically via I/O Box,
Modbus and direct marketer interface. If the value is set
dynamically, the parameter Active Power (P_ref) is
overwritten in the LCS-Tool.
Installation Manual
This applies to both the regular feed-in operation and
to the activated Limited Export function.
A load-dependent control is not possible without an
activated Limited Export function. The inverters are then
directly limited to the setpoint (see figure 23).
Procedure:
1. Open the LCS-Tool.
2. Log in as an Installer.
3. Call up the menu Setup.
4. Enter the respective values under Limited Export.
5. Select [Save] to save the changes.
The parameters Meter IP-Address, Meter Modbus Port,
Meter Modbus Unit ID and the Meter Power Modbus
Register are used for the configuration of the energy meter.
With zero export as a special case of Limited Export, the
feed-in operation into the utility grid can be completely
prevented. The parameter Safety Offset indicated as
percentage of nominal PV system power is a safety margin
to the maximum value of the output power set at the
grid-connection point. This safety value is preset for safety
reasons and due to sudden load changes. Thus, a safety
margin to the setpoint is ensured. With the activation
process, the setpoint is reduced to the safety value. Thus, the
feed-in power is always less than the actual setpoint.
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