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// Example 9.8
// Computation of per-unit impedance of a generator
// Page 368
clc;
clear;
close;
// Given data
P=100000; // Power of synchronous generator
V=480; // Voltage of synchronous generator
Ra=0.0800; // Resistive component
Xs=2.3; // Reactive component
// Computation of per-unit impedance of a generator
Sbase=P/3; // Rated apparent power per phase
Vbase=V/sqrt(3); // Rated voltage per phase
Zbase=Vbase^2/Sbase; // Rated impedance
Rpu=Ra/Zbase; // Per unit resistance
Xpu=Xs/Zbase; // Per unit reactance
Zpu=Rpu+%i*Xpu; // Per unit impedance
// Complex to Polar form...
Zpu_Mag=sqrt(real(Zpu)^2+imag(Zpu)^2); // Magnitude part
Zpu_Ang = atan(imag(Zpu),real(Zpu))*180/%pi; // Angle part
// Display result on command window
printf("\n Per-unit impedance magnitude = %0.4f Ohm ",Zpu_Mag);
printf("\n Per-unit impedance angle = %0.2f deg ",Zpu_Ang);
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