SMA SUNNY CENTRAL CP XT Series - Grid Support in the Event of Overvoltage (HVRT)

10 Function Description
SMA Solar Technology AG
User Manual 113SCCPXT-E7-BA-en-58
10.5.2.4 Grid Support in the Event of Overvoltage (HVRT)
In addition to providing grid support in the event of undervoltage, the inverter can support the utility grid in the event of
short-term overvoltage. The behavior of the inverter depends on the percentage ratio of grid voltage V
grid
to nominal
voltage V.
Figure 44: Maximum duration of overvoltage that the inverter can work through without disconnecting from the utility grid (example)
Ratio V
grid
/V Inverter behavior
Greater than 130% 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.
The inverter disconnects from the utility grid.
115% to 130% 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 3seconds without disconnecting from the
utility grid.
If the set grid monitoring time is exceeded during this period, the inverter disconnects from
the utility grid.
100% to 115% The ratio of grid voltage V
grid
to nominal voltage V is in the normal range and the inverter
feeds in without any problems.
The tripping threshold is defined by the parameter FRTDbVolNomMax.