Technical data

Nominal Plant AC power
The nominal apparent power of the entire plant must be entered here in order for the master
inverter to make the correct scaling of the reactive power generated.
Set reference value under:
• Grid management box: The external reference for reactive power for the whole plant is
received via the Danfoss Grid Management Box.
• Reactive power, Q, and Power factor, PF
The master inverter sets the entered values of Q or PF to all inverters in the plant. For
Constant Reactive Power , Q the setpoint can be entered either as a constant numeric
value in kVAr, or as a percentage of the Nominal Plant AC power.
• Setpoint curve Q(U)
The master inverter controls reactive power as a function of the grid voltage U. The
values for the setpoint curve are determined by the local utility company and must be
obtained from them.
• Setpoint curve PF(P)
The master inverter controls reactive power as a function of the plant real output pow-
er P. The values for the setpoint curve are determined by the local utility company and
must be obtained from them.
The individual setpoints are entered as up to nine data sets. Either grid power with the corre-
sponding required PF, or the grid voltage with the corresponding required amount of reactive
power are entered either as numeric values in kVAr or as a percentage of the Nominal Plant AC
power.
Setpoints are entered under:
[Setup → Grid management → PF(P) curve], or
[Setup → Grid management →> Q(U) curve]
Fallback Values
If grid management box is selected as reference value, fixed fallback values are used in case of
communication loss between the master inverter and the grid management box, or by the indi-
vidual inverter in case of communication loss to the master inverter.
[Setup → Grid management → Fallback values]
All settings for plant control are made at the master inverter.
For all other inverters (non-master inverters), the 'setpoint type' must be set to “Off” (default
setting) enabling them to accept an external setpoint coming from the master inverter. Use the
master inverter to distribute the setting “Off” to the entire network.
10.4.4. Grid Management Box
The Grid Management Box is used for interfacing to external reference sources such as relay or
current loop.
When grid management box is selected as reference source, perform the relay configuration at:
[Setup → Grid Management → Relay configuration].
10. Ancillary Services
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