fm_pmu.m

基于PSAT 软件的多目标最优潮流计算用于中小型电力系统的分析和管理

function  fm_pmu(flag)

%FM_PMU defines Phasor measurement unit
%
%Data Format Pmu.con:
%  col #1: Bus 1 number
%  col #2: Bus 1 Voltage Rate [kV]
%  col #3: Frequency rate [Hz]
%  col #4: Time constant of the voltage measure [s]
%  col #5: Time constant of the angle measure [s]
%
%Data Structure: Pmu.dat:
%
%FM_PMU(FLAG)
%   FLAG = 1 -> algebraic equations
%   FLAG = 2 -> algebraic Jacobians
%   FLAG = 3 -> differential equations
%   FLAG = 4 -> state Jacobians
%
%Author:    Federico Milano
%Date:      24-Mar-2005
%Version:   1.0.0
%
%E-mail:    [e-mail]
%Web-site:  http://thunderbox.uwaterloo.ca/~fmilano
%
% Copyright (C) 2002-2006 Federico Milano

global Pmu DAE Bus Settings

vm = DAE.x(Pmu.vm);
thetam = DAE.x(Pmu.thetam);
V1 = DAE.V(Pmu.bus);
theta1 = DAE.a(Pmu.bus);
%Tv = Pmu.con(:,4);
%Ta = Pmu.con(:,5);

switch flag

 case 0 % initialization

  DAE.x(Pmu.vm) = V1;
  DAE.x(Pmu.thetam) = theta1;
  idx = find(Pmu.con(:,4) == 0);
  if ~isempty(idx)
    pmuwarn(idx, [' Time constant Tv cannot be 0. Tv = 0.05 will be ' ...
                  'used.'])
    Pmu.con(idx,4) = 0.05;
  end
  idx = find(Pmu.con(:,5) == 0);
  if ~isempty(idx)
    pmuwarn(idx, ' Time constant Ta cannot be 0. Ta = 0.05 will be used.')
    Pmu.con(idx,5) = 0.05;
  end
  Pmu.dat = [1./Pmu.con(:,4), 1./Pmu.con(:,5)];
  fm_disp('Initialization of PMUs completed.')

 case 1 % algebraic equations


 case 2 % algebraic Jacobians


 case 3 % differential equations

  DAE.f(Pmu.vm) = (V1-vm).*Pmu.dat(:,1);
  DAE.f(Pmu.thetam) = (theta1-thetam).*Pmu.dat(:,2);

 case 4 % state variable Jacobians

  % DAE.Fx
  DAE.Fx = DAE.Fx + sparse(Pmu.vm,Pmu.vm,-Pmu.dat(:,1),DAE.n,DAE.n);
  DAE.Fx = DAE.Fx + sparse(Pmu.thetam,Pmu.thetam,-Pmu.dat(:,2),DAE.n,DAE.n);

  % DAE.Fy
  DAE.Fy = DAE.Fy + sparse(Pmu.vm,Pmu.bus+Bus.n,Pmu.dat(:,1),DAE.n,2*Bus.n);
  DAE.Fy = DAE.Fy + sparse(Pmu.thetam,Pmu.bus,Pmu.dat(:,2),DAE.n,2*Bus.n);

end


% -------------------------------------------------------------------
% function for creating warning messages
function pmuwarn(idx, msg)
fm_disp(strcat('Warning: PMU #',int2str(idx),msg))