blue’Log X series
107 | 120
14.4.17
Gradient limitation reactive power(Q) procedure
Gradient limitation for reactive power procedures is a function designed to limit the
maximum change in reactive power within a specified period. The change in reactive
power should follow a specific linear course (target trajectory). This linear course is
defined via the gradient which is given as maximum change in reactive power per
second.
The gradient limitation relates exclusively to reactive power(Q) procedures (e.g. Q(DI))
and is always active when changing the specified reactive power.
With gradient limitation, the specified 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 the time-discrete specified values.
Fig. 84: Gradient limitation reactive power procedure: Time-discrete specification
Red line:
Target trajectory for specified reactive power
Blue line:
Time-discrete specified control values