changes

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-----------------------------
 Change history for MATPOWER
-----------------------------

Version:    3.2

maintained by Ray Zimmerman <[e-mail]>

MATPOWER
$Id: CHANGES,v 1.41 2007/09/21 19:39:33 ray Exp $
Copyright (c) 1996-2007 by Power System Engineering Research Center (PSERC)
See http://www.pserc.cornell.edu/matpower/ for more info.


Changes since 3.1b2
-------------------

9/21/07
    - Released version 3.2.

9/17/07
    - Added option to cdf2matp.m to specify output case file version.

9/7/07
    - Fixed bug in pfsoln.m which caused incorrect value for Qg when
      Qmin == Qmax for all generators at a bus in power flow solution.
    - Added 5 larger scale (> 2000 bus) cases for Polish system.
      Thanks to Roman Korab <[e-mail]>.
    - Modified default OPF algorithm selection to use PDIPMOPF
      if available and MINOPF is not. Order of precedence is now
      500, 540, 520, 100/200.

7/6/07
    - Added ability in opf.m and fmincopf.m to specify initial value
      and bounds on user variables via new input arguments z0, zl, zh.

6/22/07
    - INCOMPATIBLE CHANGE: Name of option 24 in mpoption change from
      OPF_P_LINE_LIM to OPF_FLOW_LIM.
    - Added option to use current magnitude instead of apparent power
      for line flow limits. Set OPF_FLOW_LIM to 2.

6/21/07
    - INCOMPATIBLE CHANGE: Changed the sign convention used for
      phase shifters to be consistent with PTI, PowerWorld, PSAT, etc.
      E.g. A phase shift of 10 deg now means the voltage at the "to"
      end is delayed by 10 degrees.

6/15/07
    - Added t_auction_pdipm.m and renamed t_auction.m to
      t_auction_minopf.m.

6/8/07
    - Updated have_fcn.m to check for appropriate minimum versions of
      Matlab, for TSPOPF.

6/7/07
    - Modified printpf.m to correctly detect binding line limits when
      a limit of 0 is taken to mean unconstrained.
    - Fixed bugs in handling of multipliers for general PQ capability
      curves in fmincopf.m (also in mopf.m and tspopf.m).
    - Refactored t_opf.m into separate files for each solver.
    - Modified opf.m, mpoption.m, mpver.m, have_fcn.m to include
      support for TSPOPF, a new optional package of OPF solvers.

9/29/06
    - Added check to runpf.m for case where all gens hit Q limits when
      ENFORCE_Q_LIMS is enabled.


Changes since 3.1b1
-------------------

9/15/06
    - Released version 3.1b2.

9/12/06
    - Added makePDFT.m which builds the DC PTDF matrix for a specified
      slack distribution.

8/16/06
    - Added optional outputs xr, pimul to fmincopf and opf.m to make them
      fully interchangeable with mopf.m.

8/15/06
    - Added branch angle difference constraints to general OPF formulation
      in fmincopf.m (and mopf.m). These limits are specified by non-zero
      values in the ANGMIN and/or ANGMAX columns of the branch matrix.
      If limits are provided in the data, they are enforced by default.
      This can be overridden by setting the 'OPF_IGNORE_ANG_LIM' option
      to 1 using mpoption.
    - Fixed (invisible) bug with multipliers of lower bounded linear
      constraints in fmincopf.m.


Changes since 3.0.0
-------------------

8/1/06
    - Released version 3.1b1.

4/28/06
    - Fixed mpver.m so it will properly handle case where the Optimization
      Toolbox is not installed.

3/15/06
    - INCOMPATIBLE CHANGE: Updated opf.m, fmincopf.m, costfmin.m, consfmin.m to
      be able to be compatible with latest MINOPF. User supplied A matrix for
      general linear constraints no longer includes columns for y variables
      (helper vars for piecewise linear gen costs), and now requires columns
      for all x (OPF) variables. Added generalized cost model and generator PQ
      capability curves.
    - Modified savecase.m to always save MAT files with -V6 under newer Matlab
      versions.
    - Added a number of tests to t_opf.m for MINOPF and fmincopf for generalized
      costs and additional linear constraints. Added test for fmincopf for
      generator PQ capability curves.

3/10/06
    - Added baseKV data to case118.m from PSAP file 
      <http://www.ee.washington.edu/research/pstca/pf118/ieee118psp.txt>.

3/8/06
   - Renamed col 5 of gencost from N to NCOST everywhere.

10/14/05
    - Updated version 2 case file format to modify generator PQ capability
      curve specifications.
    - Added hasPQcap.m and test for gen PQ capability curve in OPF.

8/22/05
    - Added OPF_IGNORE_ANG_LIM option to mpoption.m.

8/5/05
    - Modified identification of binding constraints in printpf.m. A
      constraint is now considered to be binding if the tolerance is less
      than or equal to OPF_VIOLATION tolerance -OR- if the corresponding
      Kuhn-Tucker multiplier is non-zero. This allows binding generator
      capability curves to be reported via multipliers on Pg and Qg limits.

7/8/05
    - Updated loadcase.m, savecase.m, idx_bus.m, idx_gen.m, caseformat.m
      and tests for version 2 case file format, which includes piece-wise
      linear generator capability curves, generator ramp rates and branch
      angle difference limits.
    

Changes since 3.0b4
-------------------

2/14/05
    - Released version 3.0.0.

2/3/05
    - In mp_lp.m and mp_qp.m, on Windows it now makes sure BPMPD_MEX is not
      called in verbose mode which causes a Matlab crash.


Changes since 3.0b3
-------------------

1/28/05
    - Released version 3.0b4.

1/27/05
    - Added case6ww.m and case4gs.m.
    - Minor modifications to printpf.m to handle larger bus numbers.

1/26/05
    - Minor changes to uopf.m to make sure it plays nicely with dispatchable
      loads.

1/25/05
    - Major updates to user manual.

1/24/05
    - Switched to using the new isload() to check for dispatchable load.
    - For dispatchable loads, switched from using PG and QG to PMIN and either
      QMIN (for inductive loads) or QMAX (for capacitive loads) to define the
      constant power factor constraint. This prevents the power factor
      information from being lost when it is dispatched to zero. If the initial
      values of PG and QG are not consistent with the ratio defined by PMIN
      and the appropriate Q limit it gives an error. This is to prevent a user
      from unknowingly using a case file which would have defined a different
      power factor constraint under previous versions of MATPOWER.
      If both QMIN and QMAX are zero, it no longer includes the redundant
      unity power factor constraint.

1/20/05
    - Updated printpf.m to display dispatchable loads and generators
      separately. Reorganized the area summary section and corrected the net
      exports value (subtracted half of tie-line loss) to make the numbers
      add up correctly.

1/18/05
    - Added to runpf.m the ability to enforce generator reactive power limits
      by allowing the voltage to deviate from the set-point. This option is
      controlled by the new ENFORCE_Q_LIMS option, which is off by default.
          (Thanks to Mu Lin of Lincoln University, New Zealand
           whose contributions inspired this feature).
    - Modified pfsoln.m to divide reactive power dispatch between multiple
      generators at a bus in proportion to each gen's reactive power range,
      as opposed to equally. This means that all generators at a bus will
      reach their upper (or lower) limits simultaneously.
    - Added generator status column to generator section of printpf.m output.
      Fixed bugs where non-zero output of decommitted generators was displayed
      and included in generation totals in generator and bus sections.

1/14/05
    - Moved some setting of MNS_* default options from opf.m to mopf.m.
    - Eliminated unused output args in dcopf.m.
    - Modified printpf.m to zero out reactive generator output for DC cases
      and to use OPF_VIOLATION tolerance to detect binding constraints, as
      opposed to non-zero Kuhn-Tucker multipliers.

1/12/05
    - Modified bpmpd portion of mp_qp.m and mp_lp.m to use default value for
      TFEAS2 and eliminate variable limits which appear to be artificial
      large values used to indicate free variables.

1/4/05
    - Fixed potential bug in dimensions of Yf and Yt created in makeYbus.m.

12/17/04
    - Added feasibility check to mp_lp.m and mp_qp.m to work around a
      recently discovered bug in BPMPD_MEX 2.21 where it sometimes returns an
      incorrect (infeasible) solution for a DC OPF problem. This bug has yet
      to be encountered in any other context.

12/13/04
    - Added mpver.m to print version information.

9/23/04
    - Fixed bugs in cdf2matp.m which prevented it from working at all
      when not specifying both input parameters and caused it to
      sometimes not add the warnings at the end of the file.
    - Fixed typo in name of lower bound input argument in opf.m. Only
      affected those calling opf directly with extra linear constraints.


Changes since 3.0b2
-------------------

9/20/04
    - Released version 3.0b3.
    - Generated clean versions of all included case files using latest
      cdf2matp and savecase. Added documentation for source of data
      for case files.
    - More enhancements to cdf2matp.m. Adds comments at beginning, appends
      conversion warnings as comments at end of file. Uses savecase.m to
      save the data.
    - Updated savecase.m to use %g instead of %f many places, correctly
      handle multi-line comments, include headers for extra columns for
      solved cases. Optionally returns filename with extension.

9/17/04
    - Fixed bug in grad_std.m, introduced in 3.0b2, which prevented constr
      and LP-based OPF solvers from working for polynomial cost functions.

9/15/04
    - In cdf2matp.m, added input args, updated docs, switched to named
      indexing of data matrices, new method for creating gen costs.
    - Documentation fixes and additions from Pan Wei.


Changes since 3.0b1
-------------------

9/7/04
    - Released version 3.0b2.
    - Added OPF_P_LINE_LIM option to mpoptions to use active power
      instead of apparent power for line limits (thanks to Pan Wei
      for the suggestion and some code).