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As in Section 8.1, based on the open-loop control system LAFC
profile, we determine that the system is stable since at the cutoff
frequency (ωс = 27) it has a slope of 20 dB/dec [L2].
In the steady-state mode, the gain coefficient tends to zero, which
corresponds to a zero reference command in the regulator.
As can be seen from the LAFC [Gвз'(p)], in the absence of
derivative feedback (derivative unit / Блок БЧЗ), the system would
be unstable (in the region of ωс the slope is 60 dB/dec).
Thus, the introduction of derivative feedback stabilizes the system
during...
oscillations within the power grid.
Under large variations of δ, the system becomes non-linear, but the
derivative unit (derivative unit / Блок БЧЗ) contributes to the
damping of oscillations and the restoration of the normal
steady-state operating condition.
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