4 Settings of Grid Management Services: Fault Ride-Through (FRT)
SMA Solar Technology AG
Technical InformationSTP60-SHP75-10-Parameter-TI-en-1210
For reactive power feed-in, the positive and negative sequence components are considered separately. The half-cycle
root-mean-square values of the positive and negative sequence components of the grid voltage during the grid fault
are compared with the average root-mean-square values before the fault. The relevant time frame for the average
voltage before the grid fault can be set via the parameter FRT_T_U_AVG (default 10 minutes). Figure 2 shows the
functionality of the parameter FRT_T_U_AVG.
Figure 2: FRT voltage average as a function of time (IEC61850-90-7)
The voltage differences (DeltaU_pos and DeltaU_neg) are passed through one of the following Iq(V) characteristic
curves. The choice of the characteristic curve depends on parameter FRT_IQ_MODE (default: 0).
Figure 3: FRT_IQ_MODE = 0: as per BDEW (IEC 62850-90-7)
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