Ramp rate limiter (with Hybrid EMS)

Last review: 06 Mar 2025

About the ramp rate limiter

To avoid rapid changes in the active power and reactive power output, the Ramp rate limiter feature allows the power generating system to follow a defined gradient to increase or decrease the active power output after receiving a new setpoint from the grid operator/third party.

The ramp rate limiter feature is available for active and reactive power control and is applied to the grid operator/third-party setpoint. The functions are described below.

Active power

Generally, the ramp rate limiter always applies to setpoints.

In PV self-consumption mode, internal constant setpoints are applied. As these setpoints are constant and do not change, the ramp rate limiter has no effect.
In band-shaving mode, the ramp rate limiter has an effect because the internally generated setpoints change over time.
In closed-loop mode when a setpoint changes, the correction value always jumps to the measured actual power production. This prevents delays in the system’s power adaptation.

Ramp up	The ramp rate configured for ramp up only applies to the new setpoint from the grid operator/third party if this increases the active power output.
Ramp up/ramp down	You can define separate ramp rates for increasing and reducing the active power output: Ramp rate (ramp-up) Ramp rate (ramp-down)
Soft start	A soft start ramp rate will be applied when the active power at the point of common coupling is ≤ 0 W. The ramp rate remains in effect until the new setpoint is reached. Example: If the active power is 0 W and the setpoint is 0 %, then: The setpoint changes from 0 % to 100 % The soft start remains active until the setpoint of 100 % is reached. For a ramp rate of 1%/s, the soft start ramp rate is applied for 100 seconds.
Activation	Only via the toggle on the user interface
Configuration of ramp rates	Via the user interface

Reactive power

Ramp up	Applies to the new setpoint from the grid operator
Activation	Only via the toggle on the user interface

Examples

	Setpoint grid operator input signal	Output signal
Ramp rate limiter off
Ramp up
Ramp up/ramp down
Soft start