Voltage magnitude is undefined

[mathbagu]

• Do you want to request a feature or report a bug?
  Bug?

• What is the current behavior?
  On several of my old real cases, I have an exception "Voltage magnitude is undefined for bus XXX".

• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem
  The bug can be reproduce with open-loadflow v0.8.0 on these cases:

• 20191204_1030_2D3_D20.zip (CGMES)
• 20190821T0830Z_1D_NG__004.zip (CGMES)
• 20151011_1030_FO7_FR0.uct (UCTE)

• What is the expected behavior?
  I used to run load-flow on these files, so I suppose there could be a regression somewhere

• What is the motivation / use case for changing the behavior?

• Please tell us about your environment:

  • PowSyBl Version: 3.8.0
  • OS Version: 0.8.0

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, spectrum, etc)

(if a question doesn't apply, you can delete it)

[geofjamg]

I guess you have voltage init mode in your parameters to previous value?
If you don t have state var in your case you have to use initial value mode.

[mathbagu]

My bad, this parameter is override by my configuration file. I wonder if we should be robust and automatically switch to initial value or implement a test with a more functional message (Impossible to run load-flow in "previous_value" mode because some voltage magnitudes are missing" or something like that

What do you think? If it's not relevant, feel free to close this issue

[geofjamg]

My bad, this parameter is override by my configuration file. I wonder if we should be robust and automatically switch to initial value or implement a test with a more functional message (Impossible to run load-flow in "previous_value" mode because some voltage magnitudes are missing" or something like that

What do you think? If it's not relevant, feel free to close this issue

Indeed it would make sense to just warn if at least one voltage is missing and fallback to flat start.

[geofjamg]

I close this issue because there is another one similar to think about this topic #429