How should the change in delta V (change in voltage) look like in a perturb and observe algorithm?

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Sudarshan
Sudarshan 2018-5-27
Hello all,
I am currently working on an IEEE paper which is about extracting maximum power under partial shading of PV panels using Modular Multilevel Converter (MMC). In order to achieve maximum power, I am using a Maximum Power Point Tracking Algorithm called Perturb and Observe(P&O). The output of this P&O is the change in delta V. I am then sending this delta V to a control architecture for the MPPT controller. I am able to simulate the model in MATLAB/SIMULINK using a MATLAB function block. For testing purposes, I am giving a constant voltage of 400 V and a sinusoidal current of 177 A. I have attached the code and some figures (output graph and the SIMULINK model) for your reference. I need to know if that is what is expected as the output for the change in Voltage. It would help me if you could take a look at the graph and give me inputs and suggestions.
Thank you.
if true
function dv = pand0(V, I)
persistent Pold Vold;
if isempty(Vold)
Vold = 0;
Pold = 0;
end
P = V*I;
dV = V - Vold;
dP = P - Pold;
dalpha = 0.001;
if dP > 0
if dV > 0
V_new = V + dalpha;
else
V_new = V - dalpha;
end
else
if dV > 0
V_new = V - dalpha;
else
V_new = V + dalpha;
end
end
Pold = P;
Vold = V_new;
dv = dV;
end

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