Version 1.3.5

• Constant current constraint for CSC HVDC.
• Net update reg Q participations.
• In update set points, changed reg_by_gen to v_set_regulated.
• Branch num ratios.
• Branch method to check whether it has zero impedance.
• Ability to detect equivalent buses and merge them.
• Ability to update original network using merged network.
• Routine for localizing gen regulation.
• Added safeguard to constr_HVDCPF for zero resistance.
• Added generator P redispatch penalty function.
• CSC_DC_ISET function.
• Network "update_set_points" also updates CSC P_dc set.
• Network method for clipping switched shunt b.
• Support for components being in or out of service.
• Link to PSLF epc parser.
• Added "v_set_refrence" boolean parameter to FUNC_REG_VMAG.

Version 1.3.4

• Updated parser init/free routines to make parser params work.
• Modularized heuristics.
• Added constrained function.
• Added problem num_extra_vars bug fix for constrained functions.
• Added "apply" method to heuristic.
• Made heuristic accept array of constraint pointers instead of linked list of constraints.
• Added contingency name and corresponding setter/getter.
• Updated json float sig digits from 11 to 16.
• Modular flow routines for branches.
• Added array attribute getters for network component structs.
• Moved constraint alloc/clear to "parent" struct (advanced custom constraints can extend).
• Made constraint init/free optional.
• Removed NBOUND constraint.
• Changed PVPQ switching heuristic to HEUR_PVPQ_SWITCHING for consistency with constraint.
• Renamed LBOUND constraint to BOUND.
• Moved function alloc/clear to "parent" struct (advanced custom functions can extend).
• Made function init/free optional.
• Changed count/analyze/eval/etc loop to be bus-based.
• Fixed bug with PVPQ switching constraint when no Q vars.
• Voltage dependent loads: comp_cp, comp_cq, comp_ci, comp_cj, comp_cg, and comp_cb attributes, is_vdep routine, LOAD_PROP_VDEP property, updated parsers.
• Added CONSTR_LOAD_VDEP constraint.
• DC buses, DC branches, and VSC converters for HVDC.
• Added shunt types and net counters.
• Added bus property BUS_PROP_VSET_REG and "is_v_set_regulated" method.
• CSC converters for HVDC.
• FACTS devices.
• Extended count/analyze/eval framework (and added safeguards to existing constr/func/heur) to loop through ac and then dc buses.
• Added regulating object interface.
• Added constraint for VSC DC voltage control (CONSTR_VSC_DC_VSET).
• Added constraint for VSC DC power control (CONSTR_VSC_DC_PSET).
• Added constraint for HVDC power balance (CONSTR_HVDCPF).
• Added constraint for VSC equations (CONSTR_VSC_EQ).
• Updated PVPQ switching constraints to use reg object interface.
• Updated PVPQ switching heuristic to use reg object interface.
• Added function for encouraging VSC DC power control (FUNC_VSC_DC_PSET).
• Changed CONSTR_REG_GEN to CONSTR_REG_VSET and made it use the reg object interface and changed name to "voltage set point regulation".
• Changed bus sens_v_reg_by_gen to sens_v_set_reg.
• Made PVPQ switching heuristic consider reg buses that are slack (to be consistent with constr_REG_VSET).
• Added switching constraint for power factor regulation (CONSTR_REG_PF_SWITCH).
• Added switching heuristic for power factor regulation (HEUR_REG_PF_SWITCH).
• Added smooth constraint for power factor regulation (CONSTR_REG_PF).
• Added switching constraints for FACTS active/reactive power control (CONSTR_FACTS_PSET_SWITCH and CONSTR_FACTS_QSET_SWITCH).
• Added functions for FACTS active/reactive power control (FUNC_FACTS_PSET and FUNC_FACTS_QSET).
• Added constraint for FACTS equations (CONSTR_FACTS_EQ).
• Added load "in_service" field, getter and setter. Not used anywhere.
• Added routines for updating PQ components of load according to provided weights.
• Added very basic CSC constraints and functions (CONSTR_CSC_EQ, CONSTR_CSC_DC_PSET, CONSTR_CSC_DC_VSET, FUNC_CSC_DC_PSET).
• Added JSON support (read/write) for new components (vdep loads, csc, vsc, facts, dc bus, dc branch).
• Added switched shunt control mode (discrete, continuous) and rounding capability.
• Added network routing for rounding susceptance of discrete switched shunts and count.
• Added branch routine for using power flow count/analyze/eval subroutines to construct Jacobian of (P_km, Q_km) or (P_mk, Q_mk).
• Removed graphviz interface and dependency.
• Removed number of actions from network properties.
• Added redundant buses.
• Added output_level to nework component summary output.

Version 1.3.3

• Improved gen Q participation to look exactly at which Qs are vars to add correct number of constraints.
• Added support for changing function and constraint parameters (CONSTR_set_parameter, FUNC_set_parameter).
• Added "variable regularization" function or FUNC_REG_VAR, which has parameters w and x0 and computes (x-x0)^Tdiag(w)(x-x0).
• Symmetric connectors/removers for all bus-connected components (connecting A to B also connects B to A).
• Exposed all obj.set_bus and bus.add/remove_obj routines in Python, and made "obj.bus = None" disconnect obj from bus.
• Renamed add_batteries/add_var_generators to add_battery_from_parameters/add_var_generators_from_parameters.
• Added net routines for adding and removing generators from the network.
• Added net routines for adding and removing loads from the network.
• Added net routines for adding and removing shunts from the network.
• Added net routines for adding and removing branches from the network.
• Added net routines for adding and removing buses from the network.
• Added net routines for adding and removing batteries from the network.
• Added net routines for adding and removing var generators from the network.
• Added net routine for extracting subnetwork containing a specific set of buses.
• Extended problem.show() to show number of vars and constraints of each type.
• Fix bug involving problem/constraint/function's network going out of scope in Python.
• Added load reactive power limits.
• Integrated line_flow library source and header for linearized AC branch flow limits.
• Added Q_par (reactive power participation) field to generator.
• Changed REG_GEN constraint to treat generators separately so that constraint can be used without participations.
• Changed PAR_GEN_Q constraint to PVPQ_SWITCHING, which enforces flexible participations based on Q_par and performs all required modifications for PV-PQ switching heuristics.
• Updated PVPQ switching heuristics to utilize PVPQ_SWITCHING constraint.
• Removed net adjust_generators.
• Improved handling of branch and gen outages: Outages can be enabled by setting the outage flag. Contingencies no longer disconnect components.
• Added bus.is_star(), branch.is_part_of_3_winding_transformer(), and net.get_num_star_buses().
• Added routines for getting number of gens/branches on outage.
• Added utility routines to check function gradients and Hessians in pfnet.tests.utils.
• Added utility routines to check constraint Jacobians and Hessians in pfnet.tests.utils.
• Created network state tag to track net changes and make constr/funcs robust to net changes like outage flag updates.
• Updated bus.get_index_P and bus.get_index_Q to make bus.get_index_P work for both AC and DC PF as well as for multiple periods.
• Added bus.get_index_t for getting unique indices for each bus and time.
• Added bus area and zone.
• Started julia wrapper.
• Moved python and julia wrappers to separate repos.

Version 1.3.1

• Support for init values for constraint extra variables.
• Improved post processing of structures of constraint Hessians (now constr.c ensures lower triangular and fills H_combined ij, fixing bug in AC_FLOW_LIM).
• Mat parser detection of branches out of service.
• H_combined is now completely handled by "base" constraint in constr.c. Custom constraints no longer need to allocate this matrix.
• -Wall -Werror had no effect in Makefile.am and were moved to configure.ac. Now they work (requires autoconf-archive).
• Support for adding nonlinear constraints in Python and documentation.
• JSON network representation and parser with read/write capability.
• Base parser defaults to number of periods associated with data file and format-specific parsers are responsible for "propagating data on time".
• Added version string to info dictionary of pfnet python module.

Version 1.3.0

• Load Q variables.
• Support for variable generator curtailments.
• User-friendly way to add batteries and variable generators.
• Improved naming consistency in Python network class.
• Support for all battery and load variables in ACPF and network properties.
• Battery dynamics and boundary conditions.
• Updated documentation and examples.
• Full support for constraint auxiliary variables (lin eq, nonlin eq, line ineq).
• Elimination of obscure variables "voltage magnitude deviation".
• Elimination of obscure variables "voltage magnitude violation", "tap ratio deviation", "susceptance deviation".
• Improved setup.py without argparse that relies on existing build_ext commands for custom builds.
• Upper and lower bounds for constraint extra variables.
• Three types of voltage magnitude limits (normal, regulation, emergency).
• Load power factor, target power factor, and constraint for constant power factor.
• Removed Problem "set_network" method and required that Problem constructor takes network as argument for consistency with functions and constraints.
• Added default arguments to routines "add_batteries" and "add_var_generators".
• Fixed indentation bug in problem.show().
• (Conservative) linearized AC thermal limits via external and optional "line_flow" library.
• Changed key "raw parser" to "raw_parser" in "info" dictionary of pfnet python wrapper, and added "line_flow".
• Added constraint/function/network error checks in problem analyze and eval routines.
• Added branch phase and ratio python setters.
• Fixed sign error with second derivative of current mag with respect to phase shift in AC_FLOW_LIM constraints.

Version 1.2.9

• Changed function Hessian nnz counter (Hcounter to Hphi_nnz).
• Problem add_function takes Function object/struct and not function name.
• Problem add_constraint takes Constraint object/struct and not function name.
• Function class constructor takes function name for convenience.
• Constraint class constructor takes constraint name for convenience.
• CustomFunction class for creating functions written in python that work with the C library.
• CustomConstraint class for creating constraints written in python that work with the C library.
• Changed constraint (file) names PF and BOUND to ACPF and NBOUND, respectively.
• Separated netowrk and parser.
• (Generic) Parser class constructor takes file extension or sample filename for convenience.
• Format-specific parsers for mat,raw,art files also available (ParserMAT,ParserRAW,ParserART).
• CustomParser class for creating parsers written in python that work with the C library.
• Raw parser availability is detected when library is placed in pfnet/lib folder (no environment variable needed anymore).

Version 1.2.8

• Python-based parsers.
• Info dictionary in Python wrapper that indicates availability of graphviz, python-based parser, raw parser.
• Autotools build system (automatic detection of raw_parser, graphviz, python-based parser).
• Travis continuous integration.
• Readthedocs-based documentation.
• Fixed mpc2mat and parser_MAT gen cost ordering.

Version 1.2.7

• Added constraint that enforces AC branch flow limits using current magnitudes (ignores branches with 0 ratingA).
• Added support for extra variables in constraints (Jbar, Gbar matrices) and in problem.
• Changed constraint nnz counters (Acounter,Jcounter,Gcounter) to (A_nnz,J_nnz,G_nnz).
• Changed constraint row counters (Aconstr_index,Jcounstr_index,Gconstr_index) to (A_row,J_row,G_row).
• Made constraint that enforces DC branch flow limits ignore branches with 0 ratingA.

Version 1.2.6

• Branch bus name changes (from/to to k/m).
• Branch AC flow getters.
• Improved error handling in Problem Python class (has_error, clear_error, error checks in combine_H).
• Separated python wrapper pyx into multiple files.
• Bug fix: voltage magnitude limits in MAT parser.
• Sphinx C docs.