The voltage and current of the panel at maximum power point ?

n

I want to plot the maximum power point, thereby obtaining the V and I values. Maybe an intersection between x and y axis which can show the MPP.

Io = 0.1*10^-9;

IL = 9.5;

V = linspace(0,0.8,100);

q = 1.6*10^(-19);

k = 1.380649*10^(-23);

T = 298.15;

G =1000;

Gr = 1000;

I = (IL*(G./Gr))-(Io.*(exp((q.*V)./(k.*T))-1));

n = 72;

Vp = V.*n;

Pp = (Vp.*I);

figure(2)

plot(Vp,Pp,'r','linewidth',2);

xlabel('Voltage (V)','fontsize',15);

Pp = V.*I;

ylabel('Power (W)','fontsize',15);

title('PV Panel Power and Voltage Curve','fontsize',18)

grid minor

axis([0,50,0,400])

figure(3)

plot(I,Vp,'k','linewidth',2);

xlabel('Current (A)','fontsize',15);

ylabel('Voltage (V)','fontsize',15);

title('PV Panel Current and Voltage Curve','fontsize',18)

grid minor

axis([0,10,0,50]);

THANKS

[MUHAMED SIDIBEH]

That worked well, Thanks.

Answer 1

[Jon]

You could use this approach.

Suppose you first calculate (as I think you show above) equal length vectors of current, I, and voltage V using these values:

% calculate power
P = I.*V;

% find maximum power point and where it occurs
[Pmax,idx] = max(P);

% find the corresponding current and voltage at the maximum power point
Imax = I(idx);
Vmax = V(idx);

% plot the I-V curve and the location of the max power point
plot(I,V)
xlabel('current [amps]')
ylabel('voltage [volts')
yline(Vmax) % horizontal line through voltage where power is maximized
xline(Imax) % vertical line through current where power is maximized
text(Imax,Vmax,['Pmax = ',num2str(Pmax),' [watts]'])

This assumes you can easily compute the I and V curves with lots of points to get sufficient resolution for finding your maximum. You could also take a less brute force approach if you have the optimization toolbox to find the location of the maximum power point.