Changes between Initial Version and Version 1 of Ticket #6323, comment 5


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Timestamp:
2021-01-06T12:04:54Z (4 years ago)
Author:
Francesco Casella

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  • Ticket #6323, comment 5

    initial v1  
    1818If you provide the right power flow parameters, the library is designed to ensure that nonlinear solvers will converge to the corresponding solution. If you don't, your mileage may vary. There's nothing we can do about this - Achilles' heel of equation-based modelling when you have nonlinear implicit equations is that you may have convergence issues.
    1919
    20 The only way to avoid this is to start from a reliable power flow and compute start values for all the nonlinear variables from that - this ensures that Newton's algorithm is initialized in the proximity of the steady-state power flow and converges to it, see the our [https://arxiv.org/abs/1911.12433 paper]. That's what we do in this library.
     20The only way to avoid this is to start from a reliable power flow and compute start values for all the nonlinear variables from that - this ensures that Newton's algorithm is initialized in the proximity of the steady-state power flow and converges to it, see the discussion in our [https://arxiv.org/abs/1911.12433 paper]. That's what we do in this library.
    2121
    2222If you know any other way to guarantee the convergence to the "right" solution for a generic power grid initialization problem, that we can encode in Modelica in a declarative way, please let me know. I don't know any.