how can i find li-ion battery charging and discharging?

Hello dear friends,

could you please hepl me to write 2 equations in matlab?

how can i modelling li-ion battery charging and discharging in matlab? how can i find SOC of the battery with below eq.

the eq.

Pb(t)= (Pb(t-1)*(1-sigma))+(Ppv(t)-(PL(t)/nu_i))*nu_b; %Charging

Pb(t)= (Pb(t-1)*(1-sigma))-((Ppv(t)/nu_i)-PL(t)); %Discharging

Pb(t-1)= 3600 %SOC at the begining Wh

%Ppv(t) = %Enegy of PV wh

%PL(t) = load %Load Demand

sigma = 2 %Self_Discharge factor

nu_b = 0.95 %Battery effeciency

nu_i = 0.9 %inverter effeciency

i also uploaded matlab file

Answer 1

[Ahmad Wahid]

As far i know your PV data and demand load should be for a specific time duration( i.e 24 hours) .

for t=1:24:

Pb(t)= (Pb(t-1)*(1-sigma))+(Ppv(t)-(PL(t)/nu_i))*nu_b; %Charging

Pb(t)= (Pb(t-1)*(1-sigma))-((Ppv(t)/nu_i)-PL(t)); %Discharging

end

this will solve both equations for 24 hours

Answer 2

[Ahmad Wahid]

brother if you have find a way to solve it please provide me. i will be very thankful