Roman Bolgaryn comments

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                                            Roman Bolgaryn

PP does not check for feasibility in (O)PF?

If controllable = False, it should not be adjusted by OPF. If you are observing the opposite, please provide a failing test

PP does not check for feasibility in (O)PF?

I think if you can use PandaModels you should do it. The OPF in pandapower is not as good as with PandaModels.

Inconsistent behaviour when multiple slacks on the grid (but you don't specify `distributed_slack=True` in the runpp function

Dear @BDonnot , I haven't tested your example yet, but there is 1 case that you have not expected: if there are 2 or more slack buses in the grid...

Inconsistent behaviour when multiple slacks on the grid (but you don't specify `distributed_slack=True` in the runpp function

Dear @BDonnot , can you try connecting both slack buses with a switch and comparing the resulting bus voltages in the grid? They should be equivalent to the situation 2...

Inconsistent behaviour when multiple slacks on the grid (but you don't specify `distributed_slack=True` in the runpp function

Dear @BDonnot , the code below provides an example to illustrate the idea from my previous message. The results of the load flow calculation in a grid with 2 slacks...

Inconsistent behaviour when multiple slacks on the grid (but you don't specify `distributed_slack=True` in the runpp function

I will ask someone for a better explanation

Inconsistent behaviour when multiple slacks on the grid (but you don't specify `distributed_slack=True` in the runpp function

`In every other cases, you get completely fictions flows from this computation. Basically the problem is not "what are the flows in my grid" but rather "what power do i...

Inconsistent behaviour when multiple slacks on the grid (but you don't specify `distributed_slack=True` in the runpp function

This would not be the only case such a situation can happen. For example, if there are several transformers in the grid, and they have different tap positions, maybe even...

Inconsistent behaviour when multiple slacks on the grid (but you don't specify `distributed_slack=True` in the runpp function

In the case 3 with several slacks, and distributed_slack = False, the power values of the generators and slack_weight values are ignored. If the calculation uses distributed_slack = True, the...

Inconsistent behaviour when multiple slacks on the grid (but you don't specify `distributed_slack=True` in the runpp function

Here you can see several examples for distributed slack in pandapower: https://github.com/e2nIEE/pandapower/blob/develop/tutorials/distributed_slack.ipynb