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// Example 9.4
// Determine (a) Operating frequency (b) Load carried by each machine
// Page 359
clc;
clear;
close;
// Given data
GSR=0.0243; // Governor speed regulation
Frated=60; // Rated frequency
deltaPa=500; // Change in load for alternator A
Prateda=500; // Rated power of alternator A
deltaPb=400; // Change in load for alternator B
Pratedb=300; // Rated power of alternator B
Pch=100; // Change is power (500-400=100 KW))
Pchmach=200; // Power difference (500-300=200 KW)
// (a) Operating frequency
// From the curve in figure 9.17
// GSR*Frated/Prated=deltaP/deltaP
deltaF=(deltaPa-deltaPb)/548.697; // Change in frequency
Fbus=60.5-deltaF;
// (b) Load carried by each machine
deltaPa=(deltaF*Prateda)/(GSR*Frated); // Change in power for machine A
deltaPb=Pch-deltaPa; // Change in power for machine B
Pa=Pchmach+deltaPa;
Pb=Pchmach+deltaPb;
// Display result on command window
printf("\n Operating frequency = %0.3f Hz ",Fbus);
printf("\n Load carried by machine A = %0.2f kW",Pa);
printf("\n Load carried by machine B = %0.2f kW",Pb);
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