Download Chapter 3 VOLTAGE CONTROL

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Transcript
8.
Static error in AVR deceases with increased loop gain. Justify this. Find the
minimum value of open loop gain K, for the static error to be less than i)
1% ii) 2% and iii) 3% of reference input.
9.
Consider the block diagram of the AVR loop without stability compensator.
The values of the time constants are: T A = 0.05 s; T e = 0.5 s and T F = 3.0 s.
We would like the static error not to exceed 1% of reference input.
a) Construct the required root locus diagram and prove that the static
accuracy requirement conflicts with the requirement of stability.
b) Specifically, compute the closed loop poles if K is set at 99.
c) Reduce K by 50% and repeat part b.
10.
In AVR, high open loop gain is needed for better static accuracy; but this
causes undesirable dynamic response, possibly instability. Justify this.
11.
Explain the role of stability compensator in the AVR.
12.
Derive an approximate expression for the voltage drop in a transmission
line.
13.
Justify the need for reactive power injection.