volts_vs_phase_angle_x.m

电力系统书本的范例 想学好电力系统很有帮助 欢迎大家来下载

% M-file: volts_vs_phase_angle.m
% M-file to calculate the rms voltage applied to a load as
% a function of the phase angle firing circuit, and to
% plot the resulting relationship.

% Loop over all firing angles (1 to 179 degrees)
deg = zeros(1,179);
rms = zeros(1,179);
for ii = 1:179

   % Save firing angle
   deg(ii) = ii;

   % First, generate the waveform to analyze.
   waveform = zeros(1,180);
   for jj = 1:180
      waveform(jj) = ac_phase_controller(jj*pi/180,ii);
   end

   if ii == 45
      waveform45 = waveform;
   elseif ii == 90
      waveform90 = waveform;
   end

   % Now calculate the rms voltage of the waveform
   temp = sum(waveform.^2);
   rms(ii) = sqrt(temp/180);

end

% Plot rms voltage of the load as a function of firing angle
figure(1)
plot(deg,rms,'Linewidth',2.0);
title('\bfLoad voltage vs. firing angle');
xlabel('\bfFiring angle (deg)');
ylabel('\bfRMS voltage (V)');
grid on;

figure(2)
rad = (1:180)*pi/180;
plot(rad,waveform45,'Linewidth',2.0);
title('\bfLoad voltage for a 45