SMA MEDIUM VOLTAGE POWER STATION 500SC-JP - Grid Management Services; Dynamic Grid Support (FRT); Full and Limited Dynamic Grid Support (FRT); Grid Support in Case of Untervoltage (LVRT)

13.5 Grid Management Services
13.5.1 Dynamic Grid Support (FRT)
13.5.1.1 Full and Limited Dynamic Grid Support (FRT)
With dynamic grid support (Fault Ride Through‒ FRT), the inverter supports the utility grid during a brief grid-voltage
dip (Low Voltage Ride Through‒ LVRT) or during a short period of overvoltage (High Voltage Ride Through‒ HVRT).
With full dynamic grid support, grid support is ensured by feeding in reactive current.
With limited dynamic grid support, the inverter interrupts grid feed-in during a grid instability without disconnecting
from the utility grid.
Q at Night and dynamic grid support
Limited dynamic grid supportis available in the operating state "Q at Night".
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.
13.5.1.2 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
grid
to nominal voltage V.
Figure 84: Maximum duration of a voltage dip that the inverter can work through without disconnecting from the utility grid
Ratio V
grid
/V Inverter behavior
90% to 100% The ratio of grid voltage V
grid
to nominal voltage V is in the normal range and the inverter
feeds in without any problems.
13 Function Description
SMA Solar Technology AG
System ManualMVPS22JP-SH-en-11208