Hi I am studying IC and P&O in a boost converter for solar panels.
I am startled because I get nearly identical results. Does anyone know why can't I see pratically any deviation between both?
In the appendix I posted both my irradiance and temperature profile and the results I got from the mppt panel voltage (in every parameter, be it current, power or efficiency the result is basically really close).
I used the following functions:
function D = INC(Vpv,Ipv)
% Define internal values for the voltage and power as persistent
% variables
persistent Dprev Iprev Vprev
% Initialize the internal values for the voltage and power on the
% first pass
if isempty(Dprev)
Dprev = 0.7;
Vprev = 30;
Iprev = 8;
end
% Initialize algorithm parameters
deltaD = 0.0025;
% Calculate measured array power
deltaI = Ipv - Iprev;
deltaV = Vpv - Vprev;
delta = deltaI/deltaV;
% Increase or decrease duty cycle based on conditions
if (Vpv-Vprev) == 0
if (Ipv-Iprev) ~= 0
if (Ipv-Iprev) > 0
D = Dprev - deltaD;
else
D = Dprev + deltaD;
end
else
D = Dprev;
end
else
if (Ipv + delta*Vpv) ~= 0
if (Ipv + delta*Vpv) > 0
D = Dprev - deltaD;
else
D = Dprev + deltaD;
end
else
D = Dprev;
end
end
% Update internal values
Dprev = D;
Vprev = Vpv;
Iprev = Ipv;
function D = PandO(Vpv,Ipv)
% Define internal values for the voltage and power as persistent
% variables
persistent Dprev Pprev Vprev
% Initialize the internal values for the voltage and power on the
% first pass
if isempty(Dprev)
Dprev = 0.7;
Vprev = 30;
Pprev = 2000;
end
% Initialize algorithm parameters
deltaD = 0.0025;
% Calculate measured array power
Ppv = Vpv*Ipv;
% Increase or decrease duty cycle based on conditions
if (Ppv-Pprev) ~= 0
if (Ppv-Pprev) < 0
if (Vpv-Vprev) < 0
D = Dprev - deltaD;
else
D = Dprev + deltaD;
end
else
if (Vpv-Vprev) < 0
D = Dprev + deltaD;
else
D = Dprev - deltaD;
end
end
else
D = Dprev;
end
% Update internal values
Dprev = D;
Vprev = Vpv;
Pprev = Ppv;
Best regards
Dear Diogo,
What is the input and where is the output? The input is the incident solar radiation variation G variation as given by the stair case function shown in your figure.
The output is the output power as a function of the time t. Ideally the output power is the maximum power Pm as a function of time corresponding to G.
It is expected that the output power Po rises more slowly with time than G and settles to the steady sate value its average value equals to the expected pmax.
So, you have to my proposal to see the difference between the two algorithms.
Best wishes
For more information please follow the link: Article Enhancing the maximum power point tracking techniques for ph...
Best wishes
Dear Diogo,
What is the input and where is the output? The input is the incident solar radiation variation G variation as given by the stair case function shown in your figure.
The output is the output power as a function of the time t. Ideally the output power is the maximum power Pm as a function of time corresponding to G.
It is expected that the output power Po rises more slowly with time than G and settles to the steady sate value its average value equals to the expected pmax.
So, you have to my proposal to see the difference between the two algorithms.
Best wishes
For more information please follow the link: Article Enhancing the maximum power point tracking techniques for ph...
Best wishes
Thanks for your contribution, but my doubts still remain. In what conditions should I notice a clear deviation between the 2 methods? Also can you send please send me your article. I can't see the full text.
If it helps, I got this results, can anyone notice a big difference between both?
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