In addition, the parameter
Q-VLockInW
can be used to define a voltage at which reactive power control will be
activated after the time specified in parameter
Q-VLockInTm
has elapsed. If the voltage exceeds the threshold
defined in parameter
Q-VLockOutW
, the reactive power control will be deactivated once the time specified in
parameter
Q-VLockOutTm
has elapsed.
13.3.4 Q at Night
13.3.4.1 No Q at Night: Off Mode
The reactive power setpoint is limited to 0 kVAr. This setpoint cannot be controlled.
13.3.4.2 Q at Night with Operation Command via Modbus Protocol: VArCtlCom Mode
The reactive power setpoint is received by the communication unit and transmitted to the inverter. The setpoint is
transmitted as a percentage value and converted to kVAr in the device. If the inverter has not received any signal for
five minutes, the error message
Q-VArModFailStt
will be displayed.
13.3.4.3 Q at Night with Absolute Value: VArCnst Mode
The reactive power setpoint is set via the parameter
QoDQ-VAr
. The parameter
QoDQ-VAr
is permitted to be within
the range from
‒QoDQmax
to
+QoDQmax
.
13.3.4.4 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
, it will be
limited to
QoDQmax
. If the calculated amount of reactive power falls below the predefined value of
‒QoDQmax
, it
will be limited to
‒QoDQmax
.
13.3.4.5 Q at Night via Standard Signal: VArCnstNomAnIn Mode
The reactive power setpoint is set at the input terminals for the setpoints via an analog signal. 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
.
Signal
Power limit
Description
< 2 mA
Last valid mean value or 0 kVAr after
restart
Signal is in the invalid range.
2 mA to 4 mA
−QoDQmax
/ underexcited
The maximum amount of negatively excited reactive
power is fed in.
4 mA
−QoDQmax
/ underexcited
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
+QoDQmax
/ overexcited
End point of the characteristic curve
The maximum amount of positively excited reactive
power is fed in.
13 Function Description
SMA Solar Technology AG
System Manual
MVPS22JP-SH-en-11
200
Summary of Contents for 1000-1SC
Page 257: ......