pv array mppt under partial shading code

the following code for mppt is not working for partial shading condition.Is there any error

persistent p;

persistent v;

persistent dc;

persistent pbest ;

persistent counter ;

persistent gbest;

persistent u;

if(isempty(counter))

counter=1;

gbest= 0.5;

p=zeros(3,1);

v=zeros(3,1);

pbest=zeros(3,1);

u=1;

dc=zeros(3,1);

dc(1)=0.2;

dc(2)=0.4;

dc(3)=0.7;

end

for counter=1:1:10

for u=1:1:3

d=dc(u)

if((v_pv*i_pv)>p(u))

p(u)=(v_pv*i_pv);

v(u)=updatevelocity(v(u),pbest(u),dc(u),gbest);

dc(u)=updateduty(dc(u),v(u));

pbest(u)=dc(u);

end

end

[m,i]= max(pbest);

gbest=pbest(i);

end

d=gbest;

function vfinal=updatevelocity (velocity, pobest, d, gwbest)

w=0.1;

c1=1.2;

c2=1.2;

vfinal =(w*velocity)+(c1*rand(1)*(pobest-d))+(c2*rand(1)*(gwbest-d));

end

function dfinal=updateduty(d,velocity)

dup=d+velocity;

if(dup>1)

dfinal=1;

elseif(dup<0)

dfinal=0;

else

dfinal=dup;

end

end

end

Answer 1

[Abhishek]

Hi Anchita,

There are several issues with the code. Firstly, there is a missing function declaration at the beginning, which is essential for proper execution.

function d = myFunc
    %your code
end
%helper functions

You can refer to the following link to understand how to declare a function in MATLAB: Declare function name, inputs, and outputs - MATLAB function (mathworks.com)

Furthermore, I noticed that the variables v_pv and i_pv are not defined in the nested for loop, causing the if condition to fail and resulting in the subsequent code block being skipped. It is recommended to either define these variables or pass them as arguments to the function.

if((v_pv*i_pv)>p(u))   %<----DEFINE these variables or INTAKE them as arguments to the function 

Additionally, the condition to check for emptiness for counter in the eighth line, along with the declaration of u as 1, appears to be unnecessary. Moreover, there is no need to define u and counter variable as persistent if there isn't a specific reason to retain it in memory.