Ramp rate limiter (without Hybrid EMS)

Last modified: 05 Feb 2025

Description

To avoid rapid changes in the active power and reactive power output, the "Ramp rate limiter" option 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.

Functions

The ramp rate limiter option is available for active and reactive power control. The ramp rate limiter is applied to the grid operator / third-party setpoint. The following options are available:

Active power

Ramp up	The gradient configured for ramp up only applies to the new setpoint from the grid operator / third party if it's increasing the active power output.
Ramp up/Ramp down	Ramp-up / Ramp-down" allows you to define separate gradients ("Gradient (ramp-up)" and "Gradient (ramp-down)") for increasing and reducing the active power output.
Soft start	A soft start gradient will be used if the active power at the point of common coupling is ≤ 0 W. The gradient is valid until the new setpoint is reached. Example: Active power is 0 W and the setpoint is 0 % => Setpoint changes from 0 % to 100 % => Soft start is active until setpoint of 100 % is reached. ( e.g. for Ramp rate 1%/s = for 100 s gradient of "Soft start" is active)
Activation	The ramp rate limiter can be activated via the user interface or via a Modbus command.
Configuration of ramp rates	The ramp rate can be configured via the user interface or via a Modbus command.

Reactive power

Ramp up	The gradient configured for the ramp rate applies to the new setpoint from the grid operator.
Activation	The ramp rate limiter can only be activated via the user interface.
Configuration of ramp rates	The ramp rates can only be configured via the user interface.

User interface

Examples

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