Sungrow SH3K6 - Interface Protection System (SPI)

User Manual 11 Appendix IV: Power Response
101
When the grid frequency returns back to 50 ± 0.1 Hz (default setting) for a
minimum continuous time of 300 s, the system will end the frequency response
and return to its ordinary operation linearly with a transitional time not less than
300 s, as shown in the figure below.
t (min)-2 0 5 10 15
20 25
25
20
40
60
80
100
Pm
Pnom
P/Pnom [%]
Pmin=0, Pimax=25%*Pnom
Pmin
Gradient:
20%*Pnom
Gradient:
20%*Pm, not less than 5%*Pnom
Treset_derating
(5 min)
T1=T1max
=5 min
T2=
3.45 min
T2=T2max=15 min
- P
m
: active power delivered instantly exceeded 50.3 Hz (setting value)
- P
nom
: nominal power of the hybrid inverter
- P
min
: minimum power obtained during the transient over-frequency
Fig. 11-7 Power Restoration in Condition of Transient Over-frequency
11.2.6 Interface Protection System (SPI)
The inverter has integrated the interface protection system (SPI) to provide the
following functions:

Maximum/minimum frequency protection;

Ability to receive signals aimed at changing the frequency protection
thresholds and to receive the command of remote shutdown.
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