Full Wave Thyristor Rectifier for loop problem

Question

Mark Dawson 2021-1-23

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/724613-full-wave-thyristor-rectifier-for-loop-problem

移动：Sabin 2023-1-7

Heyo, Im trying to simulate a full wave rectifier where a thyristor is used in lieu of a diode, however simulink will be inusfficient later on.

I have the first iteraion of the output waveform looking as expected, however, any subsequent itteration end up oscilating between the expected values and zero, and I'm not quite sure why. If i increase the reolution, I obtain a slightly more reasobanble overall profile, however it does not eliminate the problem. I believe i am overlooking something in my for loop, but any help is appreciated:

%Power Supply Charechteristics
V_p = sqrt(2)*230;                       %Peak Supply Voltage (V)             
f = 50;                                  %Supply Voltage Linear Frequency (Hz)
omega = 2*pi*f;                          %Supply Voltage Angular Frequency (Rad/s)
%Rectifier Circuit Parameters
V_b = 0.7;                               %Forward Conduction Voltage Bias (V)
alpha = 15;                              %Thyristor Firing Angle (degrees)
alpha_r = alpha*pi/180;                  %Thyristor Firing Angle (Rad)
%Simulation Parameters
n = 2;                                      %Desired Number of iterations
res = 100;                                  %Desired Data Resolution
t = [0:(1/(f/n))/res:(n/f)-(1/(f/n))/res];  %timebase (s)
%Thyristor Firing Times
t_0(1)=0;
t_0([2:1:n+1])=([1:1:n]/f);
alpha_t=t_0+(1/f)*(alpha_r/(2*pi));
%%%%%%%%%%%%%%%Output Data%%%%%%%%%%%%%%%
%Supply Power Signals
V_s = V_p*sin(omega*t);              %Supply Voltage (V)
  
for ii = [1:(length(t))/n]
for i=[1:n]
if t(i*ii) >=alpha_t(i) 
V_o(i*ii)  = abs(V_s(i*ii)-2*V_b);                 %Ouput Voltage (V)
elseif t(i*ii) >t_0(i)
V_o(i*ii)  = 0;                                               %Ouput Voltage (V)
end;end;end

During the course i think i know what I am doing wrong. I think I am overwriting data with an outer and inner loop, however, i can't think how to achieve the function otherwise :/

*Update

for ii = [1:(length(t))/n]
if t(ii) >=alpha_t(1) 
V_o(ii)  = abs(V_s(ii)-2*V_b);                 %Ouput Voltage (V)
elseif t(ii) >t_0(1)
V_o(ii)  = 0;                                                   %Ouput Voltage (V)
end;end

Works as expected, in theory, i could just keep duplicating the data for n itterations, however, if i use a distored signal, as opposed to a clean sinusoid, this would cease to be adequate.

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Answer 1

Mark Dawson 2021-1-23

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/724613-full-wave-thyristor-rectifier-for-loop-problem#answer_1143692

移动：Sabin 2023-1-7

在 MATLAB Online 中打开

Ive Figured it out haha

for i = [1:n]
for ii = [1+((i-1)*length(t)/n):(i)*length(t)/n]
if t(ii) <alpha_t([i]) &t(ii) >= t_0([i]) 
V_o(ii)  = 0;              
else
V_o(ii)  = abs(V_s(ii)-2*V_b);
end;end;end