How to write the algorithm to obtain the I-V and P-V characteristics of the solar panels?

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Charalampos Ioannou 2017-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/372733-how-to-write-the-algorithm-to-obtain-the-i-v-and-p-v-characteristics-of-the-solar-panels

关闭： Sabin 2023-1-4

Hello everyone,

I have the following equations:

function F = solar1(x)

q = 1.60217662e-19;

k = 1.38064852e-23;

T = 298.15; % Temperature in degrees 25. This one is in Kelvin.

Ns = 72;

Np = 1;

Voc = 44.6;

Vm = 35.4;

Isc = 5.43;

Im = 4.95;

n = 1.086;

Iph = x(1);

Io = x(2);

Vt = x(3);

Rs = x(4);

Rp = x(5);

F(1) = Np*Iph - Np*Io*(exp(Voc/Ns*Vt)-1) - ((Np*Voc)/(Ns*Rp));

F(2) = Np*Iph - Np*Io*(exp(Isc*Rs/Np*Vt)-1) - ((Isc*Rs)/Rp) - Isc;

F(3) = Np*Iph - Np*Io*exp((((Np*Vm)+(Ns*Im*Rs))/(Ns*Np*Vt)) -1) - Np*(((Np*Vm)+(Ns*Im*Rs))/(Ns*Np*Rp))- Im;

F(4) = (((Np/Ns*Vt)*Io*(exp((Vm + ((Im*Ns*Rs)/Np))/Ns*Vt)) + (1/(Ns*Rp)/Np))/(1 + (Rs*Vt)*Io*(exp((Vm + ((Im*Ns*Rs)/Np))/Ns*Vt)) + (Rs/Rp))) - (Im/Vm);

F(5) = (((-Np/Ns*Vt)*Io*exp((Isc*Ns*Rs)/(Np*Ns*Vt)) - (Np/Ns*Rp)) / (1+(Rs/Vt)*Io*exp((Isc*Ns*Rs)/(Np*Ns*Vt)) + (Rs/Rp))) + 1/Rp;

F(6) = (((-Np/Ns*Vt)*Io*(exp(Voc/Ns*Vt)) - (1/Ns*Rp/Np)) / (1 + (Rs/Vt)*Io*(exp(Voc/Ns*Vt)) + (Rs/Rp))) + 1/Rs; F(7) = Vt - n*k*T/q;

end

I am using 'levenberq-marquardt' to solve the system above which i am able to calculate the five unknown parameters (x(1),x(2)...x(5)).

Then what i need to do is to write an algorithm to be able to plot the graphs for I-V and P-V characteristics anyone can give me a hint on how to do that?

Thanks in advance.

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John D'Errico 2017-12-13

This can be almost an impossible question for people to answer, because only you know what this aggregation of completely undocumented code does, what the variables mean, etc.

Charalampos Ioannou 2017-12-13