SMA SC 500CP-US-10 600V User Manual
Page 38
3 Product Description
SMA America, LLC
38
SCCP-US-BE-US_en-52
Operating Manual
With limited dynamic grid support, the inverter interrupts the grid feed-in during the grid voltage drop.
Figure 15: Maximum duration of a voltage dip that the inverter can work through without disconnecting from the utility grid
The operating mode of the dynamic grid support is set via the parameter FRTMod. With this, the full dynamic grid support
(FRT_BDEW), the full dynamic grid support with FRT characteristic curve (FRT_SDLWindV) and the limited dynamic grid
support (FRT_Partial) can be selected.
The level of reactive current provided during full dynamic grid support is determined via the parameter FRTArGraNom.
The level of reactive current provided during full dynamic grid support with FRT characteristic curve is determined via the
parameters FRT2ArGraNomHi and FRT2ArGraNomLo.
Ratio V
Grid
/V
Behavior of the inverter
90% to 100%
The ratio of line voltage V
Grid
to nominal voltage V is in the normal range and the inverter feeds in
without any problem.
20% to 90%
The ratio of line voltage V
Grid
to nominal voltage V is in the critical range. There is a disturbance
in the utility grid.
While this disturbance remains present, the inverter supports the electricity grid with reactive
current.
The inverter can bridge disturbances of up to two 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.
0% to 20%
The ratio of line voltage V
Grid
to nominal voltage V is in the critical range. There is a disturbance
in the utility grid.
While this disturbance remains present, the inverter supports the electricity grid with reactive
current.
The inverter can bridge disturbances of up to one second without disconnecting from the utility grid.
The requirement is that the relationship V
Grid
/V was >= 90% before the error occurred.
If the set grid monitoring time is exceeded during this period, the inverter disconnects from the utility
grid.