SMA MEDIUM VOLTAGE POWER STATION 500SC-JP - Dynamic Undervoltage Detection

Ratio V
grid
/V Inverter behavior
20% to 90% The ratio of grid voltage V
grid
to nominal voltage V is in the critical range. There is a distur-
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.
0% to 20% The ratio of grid voltage V
grid
to nominal voltage V is in the critical range. There is a distur-
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
grid
/V was at least
90% before the error occurred.
If the set grid monitoring time is exceeded during this period, the inverter disconnects from
the utility grid.
The tripping threshold is defined by the parameter FRTDbVolNomMin.
13.5.1.3 Dynamic Undervoltage Detection
The dynamic undervoltage detection extends the grid support in the event of undervoltage and changes the switch-off
behavior. The grid limits, which are stepped by default, are replaced by a continuous grid-limit function.
Figure 85: Maximum duration of a voltage dip that the inverter can work through without disconnecting from the utility grid
Position Parameter Description
1 VCtllLim Grid voltage limit level 1
2 VCtlllLim Grid voltage limit level 2
3 − Time at which the inverter disconnects from the utility grid.
13 Function Description
SMA Solar Technology AG
System Manual 209MVPS22JP-SH-en-11