Any methods to solve optimal control indirect method such as Pontryagin Minimum Principle?

Hi,

I would like to solve an optimal control problem using Pontryagin Minimum Principle. There are few numerical techniques with MATLAB examples using sym toolbox, bvp4c and ODE45 using shooting method. I am trying to implement using ODE45 solver by following steps:

1. Initialize states, co-state and control
2. ODE45 solver in forward time to find states.
3. ODE45 solver in backward time to find co-states
4. Find hamiltonian and performance index. If difference between previous and present hamiltonian is below given threshold the stop iteration or else go to 5.
5. Update the control with a selected step size.

I am facing many difficulties in implementation such as;

1. Difficulty in selecting initial control and co-state.
2. The state is not bounded within a range as it must be. (must be between 0 and 1, and final state must be a desired value)

I have attached the reference paper which I am trying to implement. If anyone knows any MATLAB toolbox to solve the same, kindly let me know.

Answer 1

[M]

Hi,

here are some related questions to start with:

https://mathworks.com/matlabcentral/answers/440335-how-to-implement-optimal-control-using-pontryagin-s-minimum-principle-for-hess-in-ev-application-as

https://mathworks.com/matlabcentral/answers/438910-how-to-solve-in-matlab-2018b

https://mathworks.com/matlabcentral/answers/392949-can-i-solve-equations-backward-in-time-pontryagin-maximum-principle-optimal-control-problem

Answer 2

[Philipp Tiwald]

Hi,

Im trying to implement a simular optimal controll problem. Could you share your solution?

[Praveen Kumar]

https://in.mathworks.com/matlabcentral/fileexchange/25889-an-optimal-control-tutorial-for-beginners

Try the above methods. These examples will help you to formulate the problem and use either of the solving method.

Answer 3

[Mohamed Abdullah]

Hello Praveen, do you mind sharing your Matlab code for the Problem you have attached in the PMP-EV file?

[Praveen Kumar]

I am sorry, the exact codes couldnt be shared as it is still under publication. Please find below sources for implementing the same.

1. https://github.com/ColleyLi/pmp_control
2. https://sites.google.com/view/mdlhyu/mdl-dev/oc_sim
3. https://in.mathworks.com/matlabcentral/fileexchange/25889-an-optimal-control-tutorial-for-beginners

[Mohamed Abdullah]

Thank you very much. I have a question about the second link. I downloaded the zipped file but it appears to me that it contains only measured data not the algorithms itself.