What does these two block in mppt represent?

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noble amin
noble amin on 28 Dec 2021
Hi everyone, from the mppt, these two blocks (1; 2 // https://imgur.com/a/jKNRoFE ) what their function according to the code.
function D=DutyRatio(V,I)
Dmax=0.95;
Dmin=0;
Dinit=0.95;
deltaD=0.0001;
persistent Vold Pold Dold;
dataType='double';
if isempty(Vold)
Vold=0;
Pold=0;
Dold=0;
end
P=V*I;
dV=V-Vold;
dP=P-Pold;
if dP ~=0
if dP<0
if dV<0
D= Dold - deltaD;
else
D= Dold+deltaD;
end
else
if dV<0
D= Dold+deltaD;
else
D=Dold-deltaD;
end
end
else D=Dold;
end
if D>=Dmax || D<=Dmin
D=Dold;
end
Dold=D;
Vold=V;
Pold=P;

Answers (1)

Pemendra Kumar Pardhi
Pemendra Kumar Pardhi on 28 Dec 2021
Hi noble, Fist block represent to unit delay and second block is reapitive sequence generator.
The mppt block provides an appropriate duty cycle for dc-dc convert. The duty is compared with Reapitive sequence generator to provide pwm signal.

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