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+// Example 9.6
+// Determine (a) System kilowatts (b) System frequency (c) kilowatt loads
+// carried by each machine
+// Page 361
+
+clc;
+clear;
+close;
+
+// Given data
+Pres=440;                    // Resistive load
+PF=0.8;                      // Power factor
+Pind=200;                    // Induction motor power
+Palt=210;                    // Alternator bus load
+deltaPa=70;                  // Change in load for machine A
+f=60;                        // Frequency
+deltaPb=70;                  // Change in load for machine B
+deltaPc=70;                  // Change in load for machine C
+
+// (a) System kilowatts 
+deltaPbus=Pres+PF*Pind;     // Increase in bus load
+Psys=Palt+deltaPbus;
+
+// (b) System frequency
+GDa=(60.2-f)/deltaPa;       // Governor droop for machine A
+GDb=(60.4-f)/deltaPb;       // Governor droop for machine B
+GDc=(60.6-f)/deltaPc;       // Governor droop for machine C
+// From the figure 9.18(b)
+deltaF=600/(350+175+116.6667) ;
+f2=f-deltaF;
+
+// (c) Kilowatt loads carried by each machine
+Pa2=deltaPa+350*deltaF;
+Pb2=deltaPb+175*deltaF;
+Pc2=deltaPc+116.6667*deltaF;
+
+// Display result on command window
+printf("\n System kilowatts = %0.0f kW ",Psys);
+printf("\n System frequency = %0.2f Hz",f2);
+printf("\n Kilowatt loads carried by machine A = %0.1f kW",Pa2);
+printf("\n Kilowatt loads carried by machine B = %0.1f kW",Pb2);
+printf("\n Kilowatt loads carried by machine C = %0.1f kW",Pc2);