Download Chapter 3 VOLTAGE CONTROL

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Transcript
Thus the transfer function of the exciter, Ge(s) =
Ke
.
1  s Te
Adding the representation of exciter as given by equation (8)
Δvf(s) =
Ke
ΔvR(s)
1  s Te
(8)
now we can draw the transfer function model of Comparator, Amplifier and
Exciter portion of the AVR loop. This is shown in Fig. 4.
Comparator
Δ|V|ref (s)
Δe (s)
+
-
Amplifier
KA
1  s TA
Exciter
ΔvR (s)
Ke
1  s Te
Δvf (s)
Δ|V| (s)
Fig. 4 Block diagram representation of comparator, amplifier and exciter
The time constants TA will be in the range of 0.02 – 0.1 sec. while Te will be in the
range of 0.5 – 1.0 sec.