first push of revised harmonic calculation code.

[vogt31337]

PR to include the code already created in #1292

It includes a new method for calculating harmonics.

[vogt31337]

Docs and Changelog are missing.

[codecov]

Codecov Report

❌ Patch coverage is 89.40568% with 41 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.85%. Comparing base (6a05449) to head (ce7951d).
⚠️ Report is 65 commits behind head on develop.

Files with missing lines	Patch %	Lines
pandapower/harmonics/harmonic_impedance_creator.py	72.26%	33 Missing ⚠️
pandapower/harmonics/balanced.py	92.63%	7 Missing ⚠️
pandapower/pd2ppc_zero.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2569      +/-   ##
===========================================
+ Coverage    74.69%   74.85%   +0.16%     
===========================================
  Files          294      297       +3     
  Lines        36026    36412     +386     
===========================================
+ Hits         26909    27256     +347     
- Misses        9117     9156      +39     

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[KS-HTK]

File names in python should not use capital letters. This goes for all Test_Case_x.py files. See PEP8

Modules should have short, all-lowercase names. Underscores can be used in the module name if it improves readability. Python packages should also have short, all-lowercase names, although the use of underscores is discouraged.

[vogt31337]

changed.

[sonarqubecloud]

Quality Gate failed

Failed conditions
8.9% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud

[vogt31337]

Since I am no expert in harmonics analysis, I can not finish this PR.
For the following help is needed:

1. The test results need to be validated.
2. Documentation needs to be written.
3. Currently the results are just returned, they should be written into the pandapowerNet.

Help would be much appreciated!