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diff --git a/509/CH15/EX15.1/15_1.sci b/509/CH15/EX15.1/15_1.sci
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+//Chapter 15 Example 1//
+clc
+clear
+//output voltage=vd,commutation angle=u//
+//ac output voltage=em//
+u=20;// in degrees//
+em=110*sqrt(2)/sqrt(3);
+vdo=3*sqrt(3)*em/%pi;
+//delay angle=a//
+a=30;//in degrees
+vd=vdo*(cosd(a)+cosd(a+u))/2;
+printf("\n DC Output voltage when delay angle is 30 degrees = %.2f kV\n",vd);
+a=90;
+vd=vdo*(cosd(a)+cosd(a+u))/2;
+printf("\n DC Output voltage when delay angle is 90 degrees = %.2f kV\n",vd);
+a=150;
+vd=vdo*(cosd(a)+cosd(a+u))/2;
+printf("\n DC Output voltage when delay angle is 150 degrees = %.2f kV\n",vd);
+\ No newline at end of file