[feature] Expose sensitivity measures such as PTDF

[Daniel Müller]

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Problem Description

Sensitivity measures such as the power transfer distribution factors (PTDF) are part of modern power network analytics. They are commonly used in market analytics, congestion management, stability analysis and more. Currently the PTDFs are calculated by pypower.makePTDF and therefore _pd2ppc needs to be used by the user. This is error prone, as one needs to deal with indices and more.

Feature Description

I suggest to expose the calculation of sensitivity measures directly, something like pp.ptdf(net). There has already been interest in this feature, as #847, #1419, #1572 and #1622 have shown.

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[V3]

Sounds like an interesting topic, could you provide more information on this topic? I have until now never used ptdf and maybe could you estimate how complex implementing this behaviour is? Or trace a bit more what needs to be changed?