Tags: ame89/PyPSA
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PyPSA Version 0.8.0 Nicely-linked release notes can be found here: https://pypsa.org/doc/release_notes.html#pypsa-0-8-0-25th-january-2017 This is a major release which contains important new features and changes to the internal API. * Standard types are now available for lines and transformers so that you do not have to calculate the electrical parameters yourself. For lines you just need to specify the type and the length, see Line Types. For transformers you just need to specify the type, see Transformer Types. The implementation of PyPSA’s standard types is based on pandapower’s standard types. The old interface of specifying r, x, b and g manually is still available. * The transformer model has been substantially overhauled, see Transformer model. The equivalent model now defaults to the more accurate T model rather than the PI model, which you can control by setting the attribute model. Discrete tap steps are implemented for transformers with types. The tap changer can be defined on the primary side or the secondary side. In the PF there was a sign error in the implementation of the transformer phase_shift, which has now been fixed. In the LPF and LOPF angle formulation the phase_shift has now been implemented consistently. See the new transformer example. There is now a rudimentary import function for pandapower networks, but it doesn’t yet work with all switches and 3-winding transformers. * The object interface for components has been completely removed. Objects for each component are no longer stored in e.g. network.lines["obj"] and the descriptor interface for components is gone. You can only access component attributes through the dataframes, e.g. network.lines. * Component attributes are now defined in CSV files in pypsa/component_attrs/. You can access these CSVs in the code via the dictionary network.components, e.g. network.components["Line"]["attrs"] will show a pandas DataFrame with all attributes and their types, defaults, units and descriptions. These CSVs are also sourced for the documentation in Components, so the documentation will always be up-to-date. * All examples have been updated appropriately.
PyPSA Version 0.7.1 http://pypsa.org/doc/release_notes.html#pypsa-0-7-1-26th-november-2016 This release contains bug fixes, a minor new feature and more warnings. * The unix-only library ``resource`` is no longer imported by default, which was causing errors for Windows users. * Bugs in the setting and getting of time-varying attributes for the object interface have been fixed. * The ``Link`` attribute ``efficiency`` can now be make time-varying so that e.g. heat pump Coefficient of Performance (COP) can change over time due to ambient temperature variations (see the `heat pump example <http://www.pypsa.org/examples/power-to-heat-water-tank.html>`_). * ``network.snapshots`` is now cast to a ``pandas.Index``. * There are new warnings, including when you attach components to non-existent buses. Thanks to Marius Vespermann for promptly pointing out the ``resource`` bug.
PyPSA Version 0.7.0 http://pypsa.org/doc/release_notes.html#pypsa-0-7-0-20th-november-2016 This is a major release which contains changes to the API, particularly regarding time-varying component attributes. * network.generators_t are no longer pandas.Panels but dictionaries of pandas.DataFrames, with variable columns, so that you can be flexible about which components have time-varying attributes; please read Time-varying data carefully. Essentially you can either set a component attribute e.g. p_max_pu of Generator, to be static by setting it in the DataFrame network.generators, or you can let it be time-varying by defining a new column labelled by the generator name in the DataFrame network.generators_t["p_max_pu"] as a series, which causes the static value in network.generators for that generator to be ignored. The DataFrame network.generators_t["p_max_pu"] now only includes columns which are specifically defined to be time-varying, thus saving memory. * The following component attributes can now be time-varing: Link.p_max_pu, Link.p_min_pu, Store.e_max_pu and Store.e_min_pu. This allows the demand-side management scheme of https://arxiv.org/abs/1401.4121 to be implemented in PyPSA. * The properties dispatch, p_max_pu_fixed and p_min_pu_fixed of Generator and StorageUnit are now removed, because the ability to make p_max_pu and p_min_pu either static or time-varying removes the need for this distinction. * All messages are sent through the standard Python library logging, so you can control the level of messages to be e.g. debug, info, warning or error. All verbose switches and print statements have been removed. * There are now more warnings. * You can call network.consistency_check() to make sure all your components are well defined; see Troubleshooting. All examples have been updated to accommodate the changes listed below.
PyPSA Version 0.6.2 http://pypsa.org/doc/release_notes.html#pypsa-0-6-2-4th-november-2016 This release fixes a single library dependency issue: * pf: A single line has been fixed so that it works with new pandas versions >= 0.19.0. We thank Thorben Meiners for promptly pointing out this issue with the new versions of pandas.
PyPSA Version 0.6.1 http://pypsa.org/doc/release_notes.html#pypsa-0-6-1-25th-august-2016 This release fixes a single critical bug: * opf: The latest version of Pyomo (4.4.1) had a bad interaction with pandas when a pandas.Index was used to index variables. To fix this, the indices are now cast to lists; compatibility with less recent versions of Pyomo is also retained. We thank Joao Gorenstein Dedecca for promptly notifying us of this bug.
PyPSA Version 0.6.0 Release notes: http://pypsa.org/doc/release_notes.html#pypsa-0-6-0-23rd-august-2016 Like the 0.5.0 release, this release contains API changes, which complete the integration of sector coupling. You may have to update your old code. Models for Combined Heat and Power (CHP) units, heat pumps, resistive Power-to-Heat (P2H), Power-to-Gas (P2G), battery electric vehicles (BEVs) and chained hydro reservoirs can now be built (see the `sector coupling examples <http://www.pypsa.org/examples/#coupling-to-other-energy-sectors>`_). The refactoring of time-dependent variable handling has been postponed until the 0.7.0 release. In 0.7.0 the object interface to attributes may also be removed; see below. All `examples <http://www.pypsa.org/examples/>`_ have been updated to accommodate the changes listed below. Sector coupling --------------- * components, opt: A new ``Store`` component has been introduced which stores energy, inheriting the energy carrier from the bus to which it is attached. The component is more fundamental than the ``StorageUnit``, which is equivalent to a ``Store`` and two ``Link`` for storing and dispatching. The ``Generator`` is equivalent to a ``Store`` with a lossy ``Link``. There is an `example which shows the equivalences <http://www.pypsa.org/examples/replace-generator-storage-units-with-store.html>`_. * components, opt: The ``Source`` component and the ``Generator`` attribute ``gen.source`` have been renamed ``Carrier`` and ``gen.carrier``, to be consistent with the ``bus.carrier`` attribute. Please update your old code. * components, opt: The ``Link`` attributes ``link.s_nom*`` have been renamed ``link.p_nom*`` to reflect the fact that the link can only dispatch active power. Please update your old code. * components, opt: The ``TransportLink`` and ``Converter`` components, which were deprecated in 0.5.0, have been now completely removed. Please update your old code to use ``Link`` instead. Downgrading object interface ---------------------------- The intention is to have only the pandas DataFrame interface for accessing component attributes, to make the code simpler. The automatic generation of objects with descriptor access to attributes may be removed altogether. * examples: Patterns of for loops through ``network.components.obj`` have been removed. * components: The methods on ``Bus`` like ``bus.generators()`` and ``bus.loads()`` have been removed. * components: ``network.add()`` no longer returns the object. Other ----- * components, opf: Unlimited upper bounds for e.g. ``generator.p_nom_max`` or ``line.s_nom_max`` were previous set using ``np.nan``; now they are set using ``float("inf")`` which is more logical. You may have to update your old code accordingly. * components: A memory leak whereby references to ``component.network`` were not being correctly deleted has been fixed.