SMA Solar Technology AG
8 Power Control
User Manual
SCCP-JP-BA-A4-en-12
65
7. In the parameter
PwrMonErrTm
configure the time lapse until recognition of the absence of setpoint specifications.
8. Confirm the parameter entry with [
Save
].
8.3.2 No Q at Night: Off Mode
The reactive power setpoint is limited to 0 kVAr. This setpoint cannot be controlled.
8.3.3 Q at Night with Setpoint Command via Modbus Protocol: VArCtlCom Mode
The reactive power setpoint is received via the Power Reducer Box or the Power Plant Controller. The setpoint is
transmitted as a percentage and converted to kVAr in the device.
If the Sunny Central has not received any signal for the last five minutes, the error message
Q-VArModFailStt
will be
displayed (see Section 8.2.2, page 63).
8.3.4 Q at Night with Absolute Value: VArCnst Mode
The reactive power setpoint is set using the parameter
QoDQ-VAr
. Note that the permitted range for the parameter
QoDQ
-
VAr
is
‒QoDQmax
to
+QoDQmax
.
8.3.5 Q at Night as a Percentage of the Nominal Power: VArCnstNom Mode
The parameter
QoDQ-VArNom
is used to set the reactive power setpoint in %. The parameter
QoDQ-VArNom
refers
to
Pmax
. If the calculated amount of reactive power exceeds the predefined value of
QoDQmax
, the power will be
limited to
QoDQmax
. If the calculated amount of reactive power falls below the predefined value of
‒QoDQmax
,
the power will be limited to
‒QoDQmax
.
8.3.6 Q at Night via Standard Signal: VArCnstNomAnIn Mode
The reactive power setpoint is set via an analog signal at the input terminals for setpoint specification (see Sunny Central
installation manual). This is usually implemented by a ripple control signal.
The analog value is converted into a reactive power setpoint. The electrical current strength of the connected signal
determines the setpoint.
The analog measured values must be between 4 mA and 19 mA. If the analog signal is less than 2 mA, an error message
will be displayed in the instantaneous value
Q
-
VArModFailStt
The analog value is converted to a setpoint for power limitation. Here, the parameter
QoDQmax
is the end point of the
linear characteristic curve.
PF-PFSubVal
Proxy value for the displacement power factor outside of feed-in operation
PF-PFExtSubVal
Proxy value for the excitation of the displacement power factor outside of feed-in operation
Signal
Power limit
Description
< 2 mA
Last valid value or 0 kVAr
after restart
Signal is in the invalid range.
2 mA to 4 mA
− Pmax
The maximum amount of negatively excited reactive power is fed in.
4 mA
− Pmax
Start point of the characteristic curve
The maximum amount of negatively excited reactive power is fed in.
11.5 mA
0 kVAr
Zero-crossing of the characteristic curve
No reactive power is fed in.
> 19 mA
+Pmax
End point of the characteristic curve
The maximum amount of positively excited reactive power is fed in.
Parameters
Description
