changes

可进行电力系统多节点系统的优化潮流计算

    - Modified uopf.m to be able to handle the case where the
      sum of the Pmin's is greater than the load. It shuts down
      generators in order of decreasing average cost at Pmin
      (breaking ties randomly) until this infeasibility is gone.

2/16/99
    - Fixed bug in pfsoln.m which caused crashes in Matlab 5
      for systems with no capacitors.
    - Added print2mp.m, which can print out a MATPOWER case file
      from the data matrices.
    - Added to run*pf.m ability to save solved case.

2/10/99
    - Modified ext2int.m to allow for area matrix to be empty.

12/3/98
    - Changed pfsoln.m so that there is only one slack generator.
      Instead of dividing the P between multiple gens at the
      slack bus in proportion to capacity (this caused problems
      for the LPconstr versions of the OPF), it now treats the
      first generator at the slack bus as the only slack generator,
      leaving the dispatch of the other gens at the bus unchanged.
    - Added generator number to generation constraint printout and
      branch number to branch data and branch flow limit printouts.

12/2/98
    - Changed printpf.m to print elapsed time and objective fcn
      value even when OUT_SYS_SUM is turned off.
    - Added code to LPconstr.m to explicitly zero out lambdas for
      non-binding constraints.

12/1/98
    - Made modifications to ...
        bustypes.m
        fun_ccv.m
        fun_std.m
        grad_ccv.m
        grad_std.m
        LPeqslvr.m
        makeSbus.m
        opf.m
        opfsoln.m
        pfsoln.m
        printpf.m    
        runpf.m
      ... to allow for multiple generators at each bus. For simple
      power flow, the Q dispatch is divided between multiple gens
      at a bus in proportion to each gen's Q capacity. Likewise
      with P for multiple gens at the slack bus.

10/29/98
    - Fixed bug in uopf.m which caused it to crash when attempting
      to restart a generator after more than 2 had been shut down.

10/19/98
    - Generalized definition of GEN_STATUS column of gen matrix
      to allow for distinctions in the status of out-of-service
      generators. The default values of 0 => out-of-service and
      1 => in-service still work, but the logic has been changed
      so that GEN_STATUS > 0 is now in-service and
      GEN_STATUS <= 0 is now out-of-service, as opposed to
      GEN_STATUS ~= 0 and GEN_STATUS == 0, respectively, which
      was used previously. This allows for a GEN_STATUS of -1,
      for example, to indicate a generator which is off-line
      but could be brought on in case of an emergency.

9/2/98
    - Fixed bug in printpf.m which caused area exports to be
      off slightly.

9/1/98
    - Fixed bug in printpf.m. Total intertie flow was double the
      correct value.

8/31/98
    - Fixed bug which included line flow limits for out-of-service
      lines in OPF.
    - Modified pfsoln.m, opfsoln.m, printpf.m to zero out flow on
      lines which are out-of-service (found by Ramazan Caglar).

7/28/98
    - Changed VAR and MVAR to VAr and MVAr everywhere in output.

3/13/98
    - Decreased the default value of LPC_TOL_X option to increase
      solution quality.
    - Modified fix of 2/10/98 to use a value based on the value of
      the OPF_VIOLATION option.

3/6/98
    - Fixed 2 bugs in makeYbus.m. Phase shifters now shift the phase the
      right direction, the line charging susceptance parameter is now
      correctly ignored for transformer and phase shifters.

3/3/98
    - Fixed a bug fun_std.m which caused it to always compute 2nd order
      derivatives. Now it only computes them when requested.

2/10/98
    - In previous versions, Pmin/Pmax constraints are relaxed by 1.0e-6
      in opf.m to avoid falsely reporting a binding Pmin/Pmax constraint
      in a case where a piece-wise linear cost function has a corner
      point exactly at the limit. Changed the amount of relaxation to
      1.0e-4 since the problem still occurred at times.

1/29/98
    - Changed the value of LPC_MAX_IT from 1000 to 400 to allow for
      earlier detection of infeasible OPF.

Changes since 1.0.1
-------------------

12/24/97
    - Released version 2.0.

12/19/97
    - Fixed ambiguity in case file data and comments regarding lines
      vs. transformers. Now a tap ratio of zero means that it's a line
      and a non-zero tap ratio means that it's a transformer.
    - Optimized formation of Ybus (and hence B matrices).

12/18/97
    - Implemented fast decoupled load flow.

12/17/97
    - Optimized formation of Jacobian matrix in newtonpf.m (significant
      improvement for large systems under Matlab 5).
    
12/16/97
    - Fixed another bug in calculation of losses. Previous versions
      did not take into account off-nominal taps for transformers.
    - Fixed a bug in calculation of losses. Previous versions
      included line charging injection in reactive line losses.
    - Added ability to optionally return solution data from
      run*.m functions.
    - Added ability to optionally print results to a file.
    - Added system and area summaries to printpf and modified to
      handle the new printing options.

12/12/97
    - Consolidated printing into printpf.m, eliminated printopf.m.
    - Removed QCCV method (standard formulation solves same problem,
      but more efficiently).
    - Removed OPF algorithms which use fixed generator voltages
      (this can still be done by changing voltage limits in the
      case file), renumbered OPF algorithms, removed CCV.m and
      varVg.m.

12/11/97
    - Added 2 more levels of control of verbose output.
    - Put all MATPOWER options into an options vector defined in
      mpoption.m.

12/10/97
    - Incorporated new LP-based OPF routines and updated alg codes.
    - Fixed a bug in the documentation in the case files regarding
      the 4th column of gencost. For piece-wise linear cost functions
      this value is the number of data points, not the number of
      parameters (x and y for each point).
    - Removed some m-files that are not used (usesOT.m, usesLP.m).
    - Renamed some m-files (OTfungra.m to fg_names.m, OTSfun.m to
      fun_std.m, OTgra.m to grad_std.m, OTCCVfun.m to fun_ccv.m,
      OTCCVgra.m to grad_ccv.m).

12/8/97
    - Rewrote uopf.m to use a smarter decommitment strategy (see the
      docs for the details of the new method). Removed ref, pv, pq
      from the list of parameters passed in, since they were not used.

11/19/97
    - Fixed a bug in previous versions of uopf.m which returned
      incorrect values for Pmin.

10/28/97
    - Increased maximum number of iterations for constr-based OPF.

10/24/97
    - Fixed a bug in previous versions which may result in incorrectly
      reporting Pmin or Pmax limits to be binding, possibly with large
      multipliers, if the piece-wise linear cost function has a corner
      point exactly at Pmin or Pmax.

10/22/97
    - Added to OTSgra.m (renamed to grad_std.m in 2.0) the ability
      to return the second derivatives of the objective function.

9/24/97
    - Fixed a bug in previous versions of runuopf.m which prevented it
      from printing out the raw data needed for our Perl DB interface.

9/23/97
    - Fixed a bug in 1.1b1 in OTCCVgra.m (renamed to grad_ccv.m in 2.0)
      which caused printing of warning message "Concatenation involves
      an incommensurate empty array" under Matlab 5.

9/22/97
    - Fixed a bug in 1.1b1 which prevented runuopf.m from running at all.
      Wrong number of parameters to call opf.m.

9/20/97
    - Released version 1.1b1.

9/19/97
    - Modified the formulation of the OT-based OPF. The objective
      function may now include costs for reactive power as well as
      active power. In previous versions the reactive power variables
      and reactive power balance equations for generator buses were
      not included explicitly in the optimization as variables and
      equality constraints. Generator reactive powers were computed
      directly. Now they are included explicitly in the optimization.
      Costs for Qg are specified in extra rows int gencost.


Changes since 1.0
-----------------

9/20/97
    - Released version 1.0.1.

9/19/97
    - Fixed a bug in 1.0 OTSgra.m and OTCCVgra.m (renamed to
      grad_std and grad_ccv.m, respectively, in 2.0).m which used
      incorrect coefficients to compute cost if specified as
      polynomials of different degrees.

9/18/97
    - Fixed a bug in 1.0 in OTopf.m which caused the last equality
      constraint (Q mismatch for last pq bus) to be treated as an
      inequality constraint. It appears that this constraint was
      normally binding (unless Qd was negative) in which case the
      solution was still correct.
    - Fixed a bug in 1.0 in runpf.m, initial voltage for generators
      which were shut down were taken from gen(:, VG) rather
      than bus(:, VM).
    - Fixed a bug in 1.0 in varVg.m which caused Kuhn-Tucker
      multipliers to print out in the wrong place for LP-based OPF.


Changes since 6/25/97 Version
-----------------------------

9/17/97
    - Released version 1.0 (first widely publicized release).
    - added placeholders for LP-solvers that we can't re-distribute
    - updated documentation

9/12/97
    - added ability to do pretty & ugly printing at the same time
      also documented that ugly printing is for talking to our
      our Perl database interface code
    - included Deqiang (David) Gan's LP IEEE -> matpower data
      conversion code
    - included Deqiang (David) Gan's LP based opf code
    - fixed LAM_Q bug, now computes correctly for generator buses
    - fixed some bugs in totcost.m

9/9/97
    - removed PRICE from idx_gen

9/4/97
    - added code to convert from (possibly non-consecutive) external
      bus numbering to consecutive internal bus numbering before
      solving, and back to external before printing results
    - replaced test*pf with run*pf which are now functions
      taking the casefile name as a parameter (among other params)
    - made changes necessary to handle new format of case file
      (generator costs moved to gencost variable)


Changes since I started keeping track
-------------------------------------

6/25/97
    - made first public release (not widely publicized)
    - documentation updates
    - changed names of m-files to fit DOS 8.3 limitation
        buildsbus.m     =>  makeSbus.m
        buildybus.m     =>  makeYbus.m
        idx_branch.m    =>  idx_brch.m
        dSbranch_dV.m   =>  dSbr_dV.m
        dAbranch_dV.m   =>  dAbr_dV.m
        ucopfsoln.m     =>  uopfsoln.m
        testucopf.m     =>  testuopf.m
        ucopf.m         =>  uopf.m  (for naming consistency)
    - changed copyright notice

6/18/97
    - modified ucopf.m to allow a generator to be turned back on if
      shutting it off results in an infeasible (or at least
      non-convergent) OPF, also changed the order of shutting down
      generators which are dispatched at zero, now chooses one with
      largest mu_Pmin     

6/12/97
    - fixed bug in printpf.m so it doesn't print PG & QG for gens that
      have been shut down
    - fixed bug in pfsoln.m to correctly compute the reference bus power
      injection when generators have been shut down

6/10/97
    - fixed Vg initialization bug in testpf.m (not just testopf, etc)

6/9/97
    - fixed bug in PLCCV versions which set the initial values of the
      cost variables wrong (used p.u. Pg instead of actual)
    - made opfsoln.m copy generator voltages back to gen(:, VG)
    - fixed bug in code which initializes generator voltages, it was
      always setting the angle to zero, now it uses the value from the
      case file

6/3/97
    - included opf variations which use cost variables constrained
      by a piece-wise linear cost function (PLCCV = piece-wise linearly
      constrained cost variables)

6/2/97
    - included opf variations which use cost variables constrained
      by a quadratic cost function (QCCV = quadratically constrained
      cost variables)
    - included opf variation which allows generator voltage
      magnitudes to vary
    - fixed line in test*pf.m scripts which initializes V0 (I'd missed
      the sqrt(-1) before

4/16/97
    - changed line 59 of ucopf.m from "return" to "break" to ensure
      return values are correct

4/14/97
    - added some print statements to ucopf.m

4/12/97
    - reduced max iterations to 100 for constr in opf.m

4/8/97
    - modified opf.m, ucopf.m, testopf.m, testucopf.m to include
      "success", a variable which indicates whether opf was solved
      successfully or not

4/7/97
    - fixed bug in ucopf.m, assumed all generators are initially
      available