function [GEN_BUS, PG, QG, QMAX, QMIN, VG, MBASE, GEN_STATUS, PMAX, PMIN, ...    MU_PMAX, MU_PMIN, MU_QMAX, MU_QMIN, PC1, PC2, QC1MIN, QC1MAX, ...    QC2MIN, QC2MAX, RAMP_AGC, RAMP_10, RAMP_30, RAMP_Q, APF] = idx_gen%IDX_GEN   Defines constants for named column indices to gen matrix.%%   [GEN_BUS, PG, QG, QMAX, QMIN, VG, MBASE, GEN_STATUS, PMAX, PMIN, ...%   MU_PMAX, MU_PMIN, MU_QMAX, MU_QMIN, PC1, PC2, QC1MIN, QC1MAX, ...%   QC2MIN, QC2MAX, RAMP_AGC, RAMP_10, RAMP_30, RAMP_Q, APF] = idx_gen;%%   Some examples of usage, after defining the constants using the line above,%   are:%%    Pg = gen(4, PG);   % get the real power output of generator 4%    gen(:, PMIN) = 0;  % set to zero the minimum real power limit of all gens% %   The index, name and meaning of each column of the gen matrix is given%   below:%%   columns 1-21 must be included in input matrix (in case file)%    1  GEN_BUS     bus number%    2  PG          Pg, real power output (MW)%    3  QG          Qg, reactive power output (MVAr)%    4  QMAX        Qmax, maximum reactive power output (MVAr)%    5  QMIN        Qmin, minimum reactive power output (MVAr)%    6  VG          Vg, voltage magnitude setpoint (p.u.)%    7  MBASE       mBase, total MVA base of machine, defaults to baseMVA%    8  GEN_STATUS  status, 1 - in service, 0 - out of service%    9  PMAX        Pmax, maximum real power output (MW)%    10 PMIN        Pmin, minimum real power output (MW)%    11 PC1         Pc1, lower real power output of PQ capability curve (MW)%    12 PC2         Pc2, upper real power output of PQ capability curve (MW)%    13 QC1MIN      Qc1min, minimum reactive power output at Pc1 (MVAr)%    14 QC1MAX      Qc1max, maximum reactive power output at Pc1 (MVAr)%    15 QC2MIN      Qc2min, minimum reactive power output at Pc2 (MVAr)%    16 QC2MAX      Qc2max, maximum reactive power output at Pc2 (MVAr)%    17 RAMP_AGC    ramp rate for load following/AGC (MW/min)%    18 RAMP_10     ramp rate for 10 minute reserves (MW)%    19 RAMP_30     ramp rate for 30 minute reserves (MW)%    20 RAMP_Q      ramp rate for reactive power (2 sec timescale) (MVAr/min)%    21 APF         area participation factor%   %   columns 22-25 are added to matrix after OPF solution%   they are typically not present in the input matrix%                   (assume OPF objective function has units, u)%    22 MU_PMAX     Kuhn-Tucker multiplier on upper Pg limit (u/MW)%    23 MU_PMIN     Kuhn-Tucker multiplier on lower Pg limit (u/MW)%    24 MU_QMAX     Kuhn-Tucker multiplier on upper Qg limit (u/MVAr)%    25 MU_QMIN     Kuhn-Tucker multiplier on lower Qg limit (u/MVAr)%   MATPOWER%   $Id: idx_gen.m,v 1.10 2006/02/13 19:26:28 ray Exp $%   by Ray Zimmerman, PSERC Cornell%   Copyright (c) 1996-2005 by Power System Engineering Research Center (PSERC)%   See http://www.pserc.cornell.edu/matpower/ for more info.%% define the indicesGEN_BUS     = 1;    %% bus numberPG          = 2;    %% Pg, real power output (MW)QG          = 3;    %% Qg, reactive power output (MVAr)QMAX        = 4;    %% Qmax, maximum reactive power output at Pmin (MVAr)QMIN        = 5;    %% Qmin, minimum reactive power output at Pmin (MVAr)VG          = 6;    %% Vg, voltage magnitude setpoint (p.u.)MBASE       = 7;    %% mBase, total MVA base of this machine, defaults to baseMVAGEN_STATUS  = 8;    %% status, 1 - machine in service, 0 - machine out of servicePMAX        = 9;    %% Pmax, maximum real power output (MW)PMIN        = 10;   %% Pmin, minimum real power output (MW)PC1         = 11;   %% Pc1, lower real power output of PQ capability curve (MW)PC2         = 12;   %% Pc2, upper real power output of PQ capability curve (MW)QC1MIN      = 13;   %% Qc1min, minimum reactive power output at Pc1 (MVAr)QC1MAX      = 14;   %% Qc1max, maximum reactive power output at Pc1 (MVAr)QC2MIN      = 15;   %% Qc2min, minimum reactive power output at Pc2 (MVAr)QC2MAX      = 16;   %% Qc2max, maximum reactive power output at Pc2 (MVAr)RAMP_AGC    = 17;   %% ramp rate for load following/AGC (MW/min)RAMP_10     = 18;   %% ramp rate for 10 minute reserves (MW)RAMP_30     = 19;   %% ramp rate for 30 minute reserves (MW)RAMP_Q      = 20;   %% ramp rate for reactive power (2 sec timescale) (MVAr/min)APF         = 21;   %% area participation factor%% included in opf solution, not necessarily in input%% assume objective function has units, uMU_PMAX     = 22;   %% Kuhn-Tucker multiplier on upper Pg limit (u/MW)MU_PMIN     = 23;   %% Kuhn-Tucker multiplier on lower Pg limit (u/MW)MU_QMAX     = 24;   %% Kuhn-Tucker multiplier on upper Qg limit (u/MVAr)MU_QMIN     = 25;   %% Kuhn-Tucker multiplier on lower Qg limit (u/MVAr)%% Note: When a generator's PQ capability curve is not simply a box and the%% upper Qg limit is binding, the multiplier on this constraint is split into%% it's P and Q components and combined with the appropriate MU_Pxxx and%% MU_Qxxx values. Likewise for the lower Q limits.return;