SMA SC 500CP XT - Manual (Page 109)

In order to prevent mutual interference of several systems with this function, the parameter Q-VArTmsVtg can be used
to set a delay time. This delay time defines how long a voltage change must be pending before a change in reactive
power feed-in is triggered. Consequently, control of the grid voltage at the grid feed-in point can be staggered across
several systems.
You can activate and deactivate the delay time by means of the parameter Q-EnaTmsVtg.
10.3.4.8 Measures for Voltage Support through Parameterization of Reactive Power/
Voltage Characteristic Curve: VArCtlVolHystDbA Mode
Consultation prior to parameter change
The parameters of this mode can only be selected or changed after consultation (see Section 13 "Contact", page 154
).
By supplying reactive power, the inverter performs voltage-stabilizing measures in the event of overvoltage or
undervoltage. The parameterization is carried out by means of a reactive power/voltage characteristic curve. The
characteristic curve can be configured flexibly by parameterization of the slopes, a type of deadband through two
voltage points, a hysteresis and the thresholds for activation.
Figure 37: Characteristic curve for reducing reactive power with deadband and hysteresis
The parameter Q-VArTmsSpnt determines the delay time which must elapse before the calculated reactive power
setpoint is actively used.
In order to prevent mutual interference of several systems with this function, the parameter Q-VArTmsVtg can be used
to set a delay time. This delay time defines how long a voltage change must be pending before a change in reactive
power feed-in is triggered. Consequently, control of the grid voltage at the grid feed-in point can be staggered across
several systems.
You can activate and deactivate the delay time by means of the parameter Q-EnaTmsVtg.
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.
10 Function Description SMA Solar Technology AG
User Manual 109 SCCPXT-BA-E4-en-54