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

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Mamad Mamadi
Mamad Mamadi 2019-11-12
回答： Ahmad Wahid 2020-2-9
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

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回答（2 个）

Ahmad Wahid
Ahmad Wahid 2020-2-9
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
Ahmad Wahid
Ahmad Wahid 2020-2-9
brother if you have find a way to solve it please provide me. i will be very thankful

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