9、Pulse Width Modulation and DC/AC Three - Phase Inverters Analysis

Pulse Width Modulation and DC/AC Three - Phase Inverters Analysis

1. Pulse Width Modulation Methods

1.1 Plotting Logic

The following code snippet is used for plotting related to pulse width modulation:

hold on 
%ploting Von 
if (VC > VT) %Vo is decided depending on VC > VT and 
    % value assigned in Vo_new 
    Vo_old = Vo_new; 
    Vo_new = Vdc; 
else 
    Vo_old = Vo_new; 
    Vo_new = - Vdc; 
end 
plot (k, - 500 + Vo_new, 'b'); 
%Van is plotted in blue ('b') with offset of - 500 
hold on 
if(Vo_new ~= Vo_old)   
    %The points of discontinuity in Van are found out 
    for j  =  - 500 - Vdc:30:VTMax  
        %dotted lines plotted 
        plot (k,j); 
        hold on 
    end 
    for j  =  - 500