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+//Example 5.9

+clc;clear;close;

+format('v',7);

+C=4000;//MW

+f=50;//Hz

+L=C;//MW//Load

+R=2.5;//%////Speed regulation constant

+H=5;//sec////Inertia constant

+delPL=1;//%////change in load

+delf=1;//%////change in frequency

+disp("Part(a)");

+Ls=80;//MW;//increase in step to load

+R=R/100*f;//z/p.u.MW

+D=delPL/delf*L/f;//MW/Hz

+D=D/C;//p.u.MW/Hz

+M=Ls/L;//unitless//for given step load

+Kp=1/D;//Hz/p.u.MW

+Tp=2*H/f/D;//sec

+Tdash1=(R+Kp)/R/Tp;//sec

+disp(Tdash1,"(R+Kp)/(R*Tp) in seconds = ");

+Tdash2=(R*Kp*M)/(R+Kp);//sec

+disp(Tdash2,"(R*Kp*M)/(R+Kp) in seconds = ");

+delf0=-Tdash2;//Hz////Static frequency error

+disp(delf0,"Static frequency error(Hz)");

+disp("Part(b)");

+Ki=(1+Kp/R)^2/4/Tp/Kp;//p.u.MW/Hz

+disp(Ki,"Critical value of Ki(p.u.MW/Hz)");