Ramp rate limiter (with HEMS)
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 ramp rate to increase or decrease the active power output after receiving a new setpoint from the grid operator/third party.
Functions
The option ramp rate limiter 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
Generally, the ramp rate limiter always applies to setpoints. In the mode PV-self consumption, internal constant setpoints are applied. As those setpoints are constant and not changing the ramp rate limiter has no effect. In the band-shaving mode, the ramp rate limiter has an effect because the internally generated setpoints are changing with time.
In closed loop mode operation during a setpoint change, the correction value always jumps to the measured actual power production to prevent the system delays in adapting the power.
Ramp rate limiter toggle | Activate the ramp rate limiter via the user interface. |
---|---|
Ramp up | The ramp rate configured for ramp up only applies to the new setpoint from the grid operator / third party if it increases the active power output. |
Ramp up/ramp down | Define separate ramp rates (Ramp rate (ramp-up) and Ramp rate (ramp-down)) for increasing and reducing the active power output. |
Soft start | A soft start ramp rate will be used if the active power at the point of common coupling is ≤ 0 W. The ramp rate is valid until the new setpoint is reached. Example:
|
Configuration of ramp rates | The ramp rate can be configured via the user interface. |
Reactive power
Ramp rate limiter toggle | The ramp rate can be configured via the user interface. |
---|---|
Ramp up | The ramp rate configured for the ramp rate applies to the new setpoint from the grid operator. |
Examples
Setpoint grid operator input signal | Output signal | |
---|---|---|
Ramp rate limiter off | ||
Ramp up | ||
Ramp up/ramp down | ||
Soft start |