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blue’Log X series
14.3.5
Gradient limitation active power (P) procedure
Gradient limitation for active power procedures is a function designed to limit the
maximum change in active power within a specified period of time. The change in
active power should follow a specific linear course (target trajectory). This linear course
is defined via the gradient which is given as the maximum change in active power per
second.
With gradient limitation, the control values are sent to the inverter in a time-discrete
manner owing to the system's dead times. The following figure is an exemplary
illustration of time-discrete control values.
Fig. 65: Gradient limitation active power procedure: Time-discrete specification
Red line:
Target trajectory for specified active power
Blue line:
Time-discrete specified values sent to the inverters
Options for the gradient limitation P procedure
Zero up only:
Gradient limitation is active only if the previous active power
limitation was 0%.
Up only:
Gradient limitation is active only if the specified active power
is increased.
Fully on:
Gradient limitation is always active if the specified active
power is decreased or increased.