Synchronous Generator transient response problem

[commelion]

Hi , Hope someone could offer me a solution to this piece of code, the code below shows a period in time of a synchronous generator transient response, My scaling is the problem as I am not getting 50 Hz 230 volts, your help would be appreciated..

My efforts so far are

% Transient Response of Generator


%clear all;
%close all;

%Highest known frequency component > 50 Hz

% set appropriate signal variables
fs = 150;
T = 1/fs;
N = 400;
n = 0:N-1;
t = n*T;
fax = (0:N/2) * (fs/N);

% Discrete signal
x = (D5(2000:5000));
subplot(211)

% Plot discrete signal
subplot (211);
plot (x);
title('Syn Generator Transient Window','FontSize',14);
xlabel('Samples', 'FontSize',12);
ylabel('Amplitude','FontSize', 12);

%Plot DFT
subplot(212)
X = abs(fft(x));
stem(fax,(2/N) * X(1:N/2+1));
title('DFT','FontSize',14);
xlabel('Frequency [Hz]','FontSize',12);
ylabel('Magnitude','FontSize',12);

 

[commelion]

Hi , Hope someone could offer me a solution to this piece of code, the code below shows a period in time of a synchronous generator transient response, My scaling is the problem as I am not getting 50 Hz 230 volts, your help would be appreciated..

My efforts so far are

% Transient Response of Generator%clear all;
%close all;

%Highest known frequency component > 50 Hz

% set appropriate signal variables
fs = 150;
T = 1/fs;
N = 400;
n = 0:N-1;
t = n*T;
fax = (0:N/2) * (fs/N);

% Discrete signal
x = (D5(2000:5000));
subplot(211)

% Plot discrete signal
subplot (211);
plot (x);
title('Syn Generator Transient Window','FontSize',14);
xlabel('Samples', 'FontSize',12);
ylabel('Amplitude','FontSize', 12);

%Plot DFT
subplot(212)
X = abs(fft(x));
stem(fax,(2/N) * X(1:N/2+1));
title('DFT','FontSize',14);
xlabel('Frequency [Hz]','FontSize',12);
ylabel('Magnitude','FontSize',12);

>> I have added the data file in exel format, it is 3000 samples long, this would be 1.5 seconds of a larger time set.

>>Just to note i am using the per unit (pu) system on my model, so this is why the time domain shows -1000 to 1000, all the time domain graphing is correct, its the fft that has me confused.com!Thanks in advance