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+// chapter 6
+// example 6.23
+// Plot average voltage and load voltage
+// page-356-357
+clear;
+clc;
+clf;
+// given
+Es=415; // in V (voltage supply)
+f=50; // supply frequency
+alpha=[0:30:120]; // in degree
+// calculate
+Em=Es*sqrt(2/3); // calculation of peak voltage
+// plot
+alpha=[0:5:60];
+Edc1=(3*sqrt(3)*Em/%pi)*cosd(alpha);
+plot2d(alpha,Edc1);
+alpha=[60:5:120];
+Edc2=(3*sqrt(3)*Em/%pi)*(1+cosd(alpha+60));
+plot2d(alpha,Edc2);
+xlabel("alpha (degrees)");
+ylabel("Edc (avg)  (in V)");
+title("Average output voltage with alpha");
+// since 3-phase waveform can not be plotted, so i have only plotted the average voltage
+\ No newline at end of file