Operation Manual 8. Inverter Functions
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8.6 Over-frequency Derating Function
When the system frequency deviation is bigger than f1i and the inverter active power is
bigger than the startup power Ps, the inverter will adjust the active power output according
to the frequency change.
P(kW)
Po
△P1
k1
f
f2if1ifn
Ps
Pn
(Hz)
Fig. 8-3 Over-frequency derating curve
The PV system under-frequency increase should be used together with the ESS or when
the system is under power limitation. The frequency regulation enable switch is off by
default. The relation curve between the active power and the frequency is shown in the
figure below.
P(kW)
k2
△P2
Po
△P1
k1
f
f2if1ifnf1sf2s
Ps
Pn
(Hz)
Fig. 8-4 Relation curve between active power and frequency
8.7 Temperature Derating
When the ambient temperature is below 45℃, the inverter can operate at 110% of the
overload condition. When the ambient temperature reaches 50℃, the inverter can keep the
nominal power output. When the ambient temperature is above 60℃, inverter enters into
protection mode.
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