Battery storage -optimisation problem_charge and discharge

NN
2021 8 4
0 个回答
更新时间：2021 8 22
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I have seperate decision variables for charge and discharge cosntraints for battery optimisation problem, but i am getting proper value as optimised outputs.
Below is the code :
% initial conditions, battery constraints
batteryMinMax.Pmin = -500e3;
batteryMinMax.Pmax = 500e3;
battEnergy = 3.6e6*upsBattCap;
batteryMinMax.Emax = 0.8*battEnergy;
batteryMinMax.Emin = 0.2*battEnergy;
%Decision variables
PbattchV = optimvar('PbattchV',N,'LowerBound',0,'UpperBound',batteryMinMax.Pmax);
EbattchV = optimvar('EbattchV',N,'LowerBound',0,'UpperBound',batteryMinMax.Emax);
PbattDchV = optimvar('PbattDchV',N,'LowerBound',0,'UpperBound',batteryMinMax.Pmin);
EbattDchV = optimvar('EbattDchV',N,'LowerBound',0,'UpperBound',batteryMinMax.Emin);
Please advice if i made any mistake.

13 个评论
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Alan Weiss
Alan Weiss 2021-8-4
These two lines are inconsistent:
batteryMinMax.Pmin = -500e3;
PbattDchV = optimvar('PbattDchV',N,'LowerBound',0,'UpperBound',batteryMinMax.Pmin);
You cannot sensibly have a lower bound of 0 and an upper bound of a negative number.
Alan Weiss
MATLAB mathematical toolbox documentation
NN
NN 2021-8-4
Ok. understood the mistake .Thank you very much Sir
NN
NN 2021-8-17
i changed the variables and
PbattDchV = optimvar('PbattDchV',N,'LowerBound',-500e3,'UpperBound',0);
But it gives zero output .
Please advice
Alan Weiss
Alan Weiss 2021-8-17
Sorry, I don't know what you mean "But it gives zero output." Does it report an error? If so, please copy and paste the entire error message, everything in red. If not, then what is the problem exactly? Does it return a value of zero when you are expecting a nonzero output, or is there something else going on?
Alan Weiss
MATLAB mathematical toolbox documentation
NN
NN 2021-8-17
yes , it return a value of zero when i expect it to be -500e3
NN
NN 2021-8-18
Please see the below code :It returns a value of zero ,and i am expecting and output of 500e3 for Pbattups.Please advice.
function [Pd,Pbattups,Ebattups] = battSolarOptimizetrial3(N,dt,Ppv,Pload,Einit,Cost,FinalWeight,upsbatteryMinMax)
prob = optimproblem;
% Decision variables
PdV = optimvar('PdV',N);
PbattupsV = optimvar('PbattupsV',N,'LowerBound',0,'UpperBound'500e3);
EbattupsV = optimvar('EbattupsV',N,'LowerBound',upsbatteryMinMax.Emin,'UpperBound',upsbatteryMinMax.Emax);
% Maximise the profit from the usage of battery and PV
prob.ObjectiveSense = 'minimize';
%prob.Objective = var1 -dt*DayaheadCost'*Ppv-FinalWeight*EbattupsV(N)-FinalWeight*Ebatt1V(N)-FinalWeight*Ebatt2V(N);
prob.Objective =dt*Cost'*PbattupsV- dt*Cost'*Ppv-FinalWeight*EbattupsV(N);
% Power input/output to battery
prob.Constraints.energyBalance = optimconstr(N);
prob.Constraints.energyBalance(1) = EbattupsV(1) == Einit;
prob.Constraints.energyBalance(2:N) = EbattupsV(2:N) == EbattupsV(1:N-1) - PbattupsV(1:N-1)*dt
% Satisfy power load with power from PV, grid and battery
prob.Constraints.loadBalance = Ppv + PdV + PbattupsV == Pload;
%prob.Constraints.battpower = PbattupsV<=500e3;
% Solve the linear program
options = optimoptions(prob.optimoptions,'Display','none');
[values,~,exitflag] = solve(prob,'Options',options);
% Parse optmization results
if exitflag <= 0
Pd = zeros(N,1);
Pbattups = zeros(N,1);
Ebattups = zeros(N,1);
else
Pd = values.PdV;
Pbattups = values.PbattupsV;
Ebattups = values.EbattupsV;
end
Walter Roberson
Walter Roberson 2021-8-18
We do not have the value of the input variables to test with.
Walter Roberson
Walter Roberson 2021-8-18
Which exact file? initial_conditions.m ? If so then are you using the same .mat that is loaded there?
NN
NN 2021-8-18
battsolar file I have edited according to my model and trying to use
but the files in it which are initial conditions and battsolar can be sued to verify
Walter Roberson
Walter Roberson 2021-8-21
You are going to need to tell me which files or data to load and what to pass to battSolarOptimizetrial3
I would suggest writing a script that does the necessary steps.
Walter Roberson
Walter Roberson 2021-8-22
The model there is not compatible with the function at https://www.mathworks.com/matlabcentral/answers/891877-battery-storage-optimisation-problem_charge-and-discharge#comment_1693172 -- the function has fewer inputs than the Simulink model is passing in.

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NN
NN
2021-8-4

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Walter Roberson
2021-8-22

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