idx_bus

idx_bus()
idx_bus() - Defines constants for named column indices to bus matrix.
Example:

[PQ, PV, REF, NONE, BUS_I, BUS_TYPE, PD, QD, GS, BS, BUS_AREA, VM, ...
VA, BASE_KV, ZONE, VMAX, VMIN, LAM_P, LAM_Q, MU_VMAX, MU_VMIN] = idx_bus;

Some examples of usage, after defining the constants using the line above,
are:

 Pd = bus(4, PD);       % get the real power demand at bus 4
 bus(:, VMIN) = 0.95;   % set the min voltage magnitude to 0.95 at all buses

The index, name and meaning of each column of the bus matrix is given
below:

columns 1-13 must be included in input matrix (in case file)
 1  BUS_I       bus number (positive integer)
 2  BUS_TYPE    bus type (1 = PQ, 2 = PV, 3 = ref, 4 = isolated)
 3  PD          Pd, real power demand (MW)
 4  QD          Qd, reactive power demand (MVAr)
 5  GS          Gs, shunt conductance (MW demanded at V = 1.0 p.u.)
 6  BS          Bs, shunt susceptance (MVAr injected at V = 1.0 p.u.)
 7  BUS_AREA    area number, (positive integer)
 8  VM          Vm, voltage magnitude (p.u.)
 9  VA          Va, voltage angle (degrees)
 10 BASE_KV     baseKV, base voltage (kV)
 11 ZONE        zone, loss zone (positive integer)
 12 VMAX        maxVm, maximum voltage magnitude (p.u.)
 13 VMIN        minVm, minimum voltage magnitude (p.u.)

columns 14-17 are added to matrix after OPF solution
they are typically not present in the input matrix
                (assume OPF objective function has units, u)
 14 LAM_P       Lagrange multiplier on real power mismatch (u/MW)
 15 LAM_Q       Lagrange multiplier on reactive power mismatch (u/MVAr)
 16 MU_VMAX     Kuhn-Tucker multiplier on upper voltage limit (u/p.u.)
 17 MU_VMIN     Kuhn-Tucker multiplier on lower voltage limit (u/p.u.)

additional constants, used to assign/compare values in the BUS_TYPE column
 1  PQ    PQ bus
 2  PV    PV bus
 3  REF   reference bus
 4  NONE  isolated bus