Simulink: Sine wave generation. Configuration problem.
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Hi, While using Simulink, I simply connect a 'sine wave generator' (picked from Simulink>>Sources) to the scope and set the frequency at 100*pi rad/s.
However, on running the simulation, I get a randomly increasing waveform and not a sinusoidal signal of above freq. However, if I set a frequcny such as 1 rad/s, a perfect sine wave is obtained.
I think I must choose a 'continuous' scale to run it and right now maybe a 'discrete scale' is chosen with large step size. May someone suggest a possible remedy?
Thanks.
1 个评论
yassine amine
2018-3-24
exempel: tried with time=10s , Amplitude=200 , Frequency=100*pi , sample time=0.00001 it gives you a better result
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Guy Rouleau
2011-2-6
1 个投票
By default, the Simulink solver chooses the time steps using:
dt = (t_stop-t_start)/50
With the default parameters, it gives 50 Hz, or a period of 0.02. this is why you do not see the 100rad/s sine way proprerly... Nyquist criteria and aliasing!
I made the following blog post exactly on this topic:
http://blogs.mathworks.com/seth/2009/07/14/refining-the-output-of-a-simulation/
4 个评论
ANUBHAV SINHA
2011-2-7
Guy Rouleau
2011-2-7
Is that a real question? You are using SimPowerSystems and the block you are talking about is the POWERGUI block!
Make yourself a gift and please read the Getting Started section of the SimPowerSystems documentation:
http://www.mathworks.com/help/toolbox/physmod/powersys/ug/f10-1368.html
Giovanni
2014-6-2
Thank you!!! It helped a lot! :)))))
ARYA VIJAYAN
2015-4-23
Thank you...you helped me..!!
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