16 Program features
DC overvoltage monitoring
If the DC voltage is over 1000 V, the inverter gives a DC overvoltage warning and grid
connection is not allowed. The inverter may be damaged if the input voltage is higher than
1100 V
DC
. If the DC voltage is over 1100 V
DC
, the inverter gives the DC overvoltage fault.
Maximum power point tracking range
Maximum power point tracking (MPPT) range with rated Power P
AC,rated
is available
between 580 V and 850 V under nominal conditions and at nominal AC voltage. See
MPPT range @ P
AC,rated
in the figure on page 15. Maximum power point tracking operates
up to 950 V, but the available inverter maximum power between 850 V and 950 V depends
on the temperature inside the inverter.
The MPPT range operates between V
MPPT_min
and 950 V. The V
MPPT_min
is the higher
value of either the parameter 178.03 Minimum voltage ref or the voltage level that depends
on the AC voltage. The default value for parameter 178.03 Minimum voltage ref is 550 V
and nominal value for the V
MPPT_min
is 580 V @ 400 VAC.
The inverter topology is a single stage inverter which means that the inverter does not
have a DC / DC booster. Thus the inverter startup voltage and minimum/maximum power
point voltage depends linearly on the AC output voltage.
• If the available PV power is greater than the derated power of the inverter, MPP
tracking is disabled and DC voltage is determined by the PV curve. The inverter limits
the output power while the voltage rises, but the inverter stays connected to the grid
unless the voltage exceeds 1000 V.
• If the available PV power is smaller than the derated power of the inverter, MPP is
tracked within the operating voltage range. MPP tracking operates up to 950 V after
which the inverter clamps the DC voltage to 950 V. MPP is not allowed and will not
push the operation point above 950V.
DC current limiting
The inverter controls its output power such that the DC input current does not exceed
58 A. The lowest DC input voltage that provides maximum output power is 580 V under
nominal conditions.
Settings
178.03 Minimum voltage ref
178.04 Maximum voltage ref
Diagnostics
101.10 DC voltage
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