Pandapower

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- [ADDED] feature: storing to json and restoring of nets with pandas multiindex dataframes and series
- [ADDED] several 'marker size legends' sizes + a spec. color can be passed to weighted_marker_traces
- [CHANGED] changed default optimization method in the estimation module from OptAlgorithm to "Newton-CG"
- [CHANGED] cim2pp converter documentation fixes
- [CHANGED] make legend item size constant in :code:`simple_plotly`
- [FIXED] add (nan) field "coords" to bus geodata in create_cigre_network_hv to avoid fatal error when exporting to Excel
- [FIXED] documentation of powerfactory converter
- [FIXED] create.py: if optional arguments are None or nan, the optional columns will not be added
- [FIXED] add tap_dependent_impedance attributes to trafo3w instead of trafo, in create.create_transformer3w and create.create_transformer3w_from_parameters
- [CHANGED] renamed functions: drop_from_group() -> detach_from_group(), append_to_group() -> attach_to_group(), check_unique_group_names() -> check_unique_group_rows()
- [CHANGED] attach_to_group(): enable handling of different reference_column passed than existing
- [ADDED] toolbox function :code:`count_elements`, :code:`drop_elements`, :code:`res_power_columns`
- [ADDED] new group functions :code:`element_associated_groups`, :code:`attach_to_groups`, :code:`group_res_power_per_bus`, :code:`group_index`
- [CHANGED] __repr__ (used by print(net)) now considers groups appropriately
- [ADDED] documentation of DeprecationWarning process
- [ADDED] add TDPF parameters as optional parameters for create line functions in create.py
- [CHANGED] remove support for Python 3.7 and add Python 3.11
- [CHANGED] split toolbox.py -> better overview, avoiding circular imports
- [CHANGED] aim for toolbox parameter name consistency: element_types, element_index (changes to mandatory parameters only)
- [CHANGED] output type of toolbox function :code:`element_bus_tuples`: set -> list
- [ADDED] import of internal packages such as control or converter
- [ADDED] group consideration in toolbox replace element functionality
- [ADDED] implementation of the "recycle" functionality for DC power flow and timeseries with run=pp.rundcpp
- [ADDED] calculate branch results for current magnitude and angle, voltage magnitude and angle, active and reactive power for short circuit calculation
- [ADDED] implement the superposition method ("Type C") for the short circuit calculation - consider pre-fault voltages
- [FIXED] Trafo control stepping direction for side=="hv"
- [ADDED] feature: protection - implementation of over-current relay
- [FIXED] Shunt admittance modelling for 3 phase calculations
- [ADDED] bulk creation function create_storages and create_wards
- [ADDED] FACTS devices Shunt Var Compensator (SVC) and Thyristor-Controlled Series Capacitor (TCSC) as new pandapower elements net.svc and net.tcsc

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- [ADDED] a 'marker size legend' (scale_trace) can be displayed for weighted_marker_traces with plotly
- [FIXED] bugfix in toolbox._merge_nets_deprecated
- [CHANGED] added tests for pp.control.Characteristic, removed Characteristic.target

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- [ADDED] plotting function for dclines (create_dcline_collection), also added in simple_plot
- [ADDED] calculation of overhead line temperature in Newton-Raphson with two simplified methods (Frank et al. and Ngoko et al.)
- [ADDED] group functionality
- [ADDED] auxiliary function warn_and_fix_parameter_renaming to throw a derpecation warning (not an Error) if old name of a parameter is used
- [ADDED] zero-sequence parameters for net.impedance
- [ADDED] File I/O: Can now save and load pandapower serializable objects to Excel, PostgreSQL
- [ADDED] additional_traces (prepared by the user) can be passed to simple_plotly
- [ADDED] Added converter CGMES v2.4.15 to pandapower
- [CHANGED] TDPF: rename r_theta to r_theta_kelvin_per_mw, add r_theta_kelvin_per_mw to net.res_line
- [CHANGED] Compatibility with pandas 1.5, dropped "six" dependency
- [CHANGED] from_ppc(): revision of indexing and naming of elements
- [CHANGED] Complete revision of validate_from_ppc()
- [ADDED] helper functions for contingency calculation
- [CHANGED] Improve defaults, add docstrings and rename parameters of plot_voltage_profile() and plot_loading()
- [CHANGED] merge_nets(): revised for groups and new behavior regarding indexing; reindex_elements(): revised for groups, don't overwrite column "index" and feature parameter lookup
- [FIXED] Bug with user_pf_options: _init_runpp_options in auxiliary.py ignored user_pf_options when performing sanity checks

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- [FIXED] remove the parameter ignore_order in DeepDiff (__eq__), add __hash__ to JSONSerializableClass
- [ADDED] store and restore functionality of dataframe index names with to_json() and from_json()
- [ADDED] generalization from_json() with parameter empty_dict_like_object

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- [ADDED] added arbitrary keyword arguments, ``**kwargs``, in all create-functions
- [ADDED] groups functionality to allow grouping pandapower net elements and enable functionality to such groups
- [FIX] from_ppc() converter and power system test cases: add missing factor for tap_side=="lv"; change tap_side to "hv" for all test cases (were converted without new factor, so as the tap_side is "hv")
- [ADDED] from_mpc() converter: added functionality to import .m files via external package
- [CHANGED] from_ppc() converter: added option of tap_side and essential speed up
- [CHANGED] drop support of pandas versions < 1.0
- [ADDED] parameter in_ka for rated switch current
- [ADDED] current and loading result for switches
- [FIXED] bug for disabled continous tap controllers
- [ADDED] File I/O download and upload pandapowerNet to PostgreSQL
- [ADDED] __eq__ method for JSONSerializableClass using deepdiff library, and adjusted pp.nets_equal to use it. Requires deepdiff
- [CHANGED] enable calculating PTDF for a subset of branches
- [ADDED] in from_json one can pass a new variable of type dict called 'replace_elements'. Dict values replace the key in the loaded json string.

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- [ADDED] added support for Python 3.10
- [ADDED] added a function to pandapower.plotting to set line geodata from the geodata of the connected buses
- [ADDED] plotly hover information will indicate parallel lines, if parallel > 1
- [ADDED] 'showlegend' option for simple_plotly
- [CHANGED] rename u by vm (voltage magnitude) in file and functions names
- [FIX] plotly: only one legend entry for all lines/trafos instead of single entries for each one
- [FIX] fixed deprecation warning for pandas indexing with set (sets changed to lists inside .loc)
- [FIX] fixed hover information for lines in plotly
- [ADDED] functions to obtain grid equivalents (power system reduction with REI, Ward, X-Ward methods)
- [CHANGED] use numpy to vectorize trafo_control
- [ADDED] generic functions in pandapower.toolbox to read and write data to/from elements
- [CHANGED] remove code duplication in const_control, characteristic_control
- [ADDED] added the functionality to import grid data from PowerFactory
- [FIXED] failing tests for PowerModels integration due to the missing pm option "ac"