Grid Support In Case Of Untervoltage (Lvrt) - SMA SUNNY CENTRAL 500CP XT User Manual

SMA Solar Technology AG
The dynamic grid support function is activated via the parameter FRTEna. The inverter behavior can be controlled via
the parameter FRTMod. The level of reactive current provided with full dynamic grid support is determined via the
parameter FRTArGraNom. The grid limits and deactivation delays vary depending on the country.

10.5.2.2 Grid Support in Case of Untervoltage (LVRT)

The inverter can support the utility grid during a brief grid-voltage dip. The behavior of the inverter depends on the
percentage ratio of grid voltage V
Figure 42: Maximum duration of a voltage dip that the inverter can work through without disconnecting from the utility grid
Ratio V /V
grid
90% to 100%
20% to 90%
0% to 20%
The tripping threshold is defined by the parameter FRTDbVolNomMin.
User Manual
to nominal voltage V.
grid
Inverter behavior
The ratio of grid voltage V
feeds in without any problems.
The ratio of grid voltage V
bance in the utility grid.
While this disturbance remains present, the inverter supports the utility grid with reactive cur-
rent.
The inverter can bridge disturbances of up to five seconds without disconnecting from the util-
ity grid.
If the set grid monitoring time is exceeded during this period, the inverter disconnects from
the utility grid.
The ratio of grid voltage V
bance in the utility grid. While this disturbance remains present, the inverter supports the util-
ity grid with reactive current. The inverter can bridge disturbances of up to 1.2 seconds with-
out disconnecting from the utility grid. The requirement is that the ratio V
90% before the error occurred.
If the set grid monitoring time is exceeded during this period, the inverter disconnects from
the utility grid.
to nominal voltage V is in the normal range and the inverter
grid
to nominal voltage V is in the critical range. There is a distur-
grid
to nominal voltage V is in the critical range. There is a distur-
grid
10 Function Description
/V was at least
grid
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