Reactive power (Hybrid EMS)

Last modified: 04 Sep 2025

Note

The content on this page refers only to the blue'Log XC combined with the Hybrid EMS licence.

Under Power control > Reactive power, you can configure parameters related to reactive power control.

Here is an overview of the user interface:

Reactive power overview (part2).png — Reactive power control overview

Item	Name	Details
1	Reactive power control toggle	Activate the toggle ONLY after you have fully configured your power control setup.
2	Extended settings icon	Configure system behavior, including controller sampling time (default value 500 ms), setpoint reference, and preferred source. See Parameter preferred source.
3	Basic settings	Displays the operation mode for each controller in your system. The operation mode can not be configured and always runs in closed loop. Select the Extended settings icon next to each controller to set controller tuning options
4	Method switch	Toggle activated: Choose a method switch via digital input or via Modbus and enter additional parameters. Toggle deactivated: Use the setpoint command method
5	Setpoint command method	Select relevant parameters from the dropdown for the setpoint command method and enter the values via the Gear icon.
6	Fail-safe operation	Configure fail-safe behavior in case of communication loss. See Fail-safe operation (Hybrid EMS).
7	Ramp rate limiter	Configure ramp rate limiter. See Ramp rate limiter.

Parameter: Preferred source

The Preferred source parameter refers to the source that will be the first to respond to reactive power demand. If it cannot fully meet the demand on its own, the second source will activate to provide additional support up to its available capacity. You can select PV or battery.

Preferred source for covering reactive power demand.png — Preferred source for covering reactive power demand