SMA SHP 75-10 - Active Power Ramp Rates; Setting the Maximum Active Power; Setting the Reactive Power; Setting the Power Factor (PF)

5 Settings of Grid Management Services
SMA Solar Technology AG
Technical InformationSTP60-SHP75-10-Parameter-TI-en-1216
5.2.5 Active Power Ramp Rates
The active power is ramped according to these setting whenever the external setpoint for active power is changed.
Note that two parameters are available: one for decreasing and one for increasing setpoints.
Parameter name Setting range Step size
RmpDecTmm_EXT -0.6%/min to -1200%/min (default) 0.1%
RmpIncTmm_EXT 0.6%/min to 1200%/min (default) 0.1%
5.2.6 Setting the Maximum Active Power
The active power is limited according to this parameter.
Parameter name Setting range Step size
P_ref 0% to 100% (default) 0.1%
5.2.7 Setting the Reactive Power
This parameter indicates the reactive power setpoint (only available if control mode 5 has been selected in the
parameter ModeSelect).
Parameter name Setting range Step size
Q_ref 0% to ±100% (default: 0%) 0.1%
5.2.8 Setting the Power Factor (PF)
This parameter indicates the setpoint for the power factor (PF) (only available if control mode 9 has been selected in
the parameter ModeSelect).
Parameter name Setting range Step size
PF_ref 0.8 to 1.0 for overexcitation
-0.8 to -1.0 for underexcitation (default)
0.01
5.2.9 Setting the Apparent Power
Some grid codes require that the PV system always generates a certain amount of apparent power, i.e. the system
operates within a unit circle in the PQ diagram. If the parameter S_ref is set to 60%, the PV system does not generate
reactive power until the active power is above 60%. However, if the active power is lower than 60%, the PV system
starts to generate reactive power to keep the apparent power at 60%. If the sign is positive, the PV system will
exchange overexcited reactive power. If the sign is negative, the system will exchange underexcited reactive power.
This type of control mode should not be used when a local load is connected, since it could cause the PV system to
lower the production of active power (only available if control mode 3 has been selected in the parameter
ModeSelect).
Parameter name Setting range Step size
S_ref 0% to ±100% (default: 0%) 0.1%