Download Chapter 3 VOLTAGE CONTROL

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Transcript
2.5 DYNAMIC RESPONSE OF AVR LOOP
Referring to block diagram in Fig. 7,
the time response is given by
ΔΙVΙ (t) = L-1 { ΔΙVΙref (s)
G (s)
}
G (s)  1
Δ|V|ref (s)
G (s)
G (s)  1
Δ|V| (s)
Fig. 7 Reduced Block diagram
representation of AVR loop
(22)
Mathematically, the time response depends upon the eigenvalues or closed-loop
poles, which are obtained from the characteristic equation G (s) + 1 = 0. The
location of eigenvalues in the s-plane depends upon open-loop gain K and the
three time constants T A, Te and T’d o. Of these parameters only the loop gain K
can be considered adjustable. It is interesting to study how the magnitude of this
gain affects the location of three eigenvalues in the s-plane and thus the transient
stability.
A root locus plot yields valuable information in this regard. Fig. 8 depicts the
root-locus diagram for the AVR loop.