FFT analysis through powergui block is showing empty in signal options.

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ANIMESH UPADHYAY 2019-7-19

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评论： Shyju 2024-4-5，3:40

Hi all,

I have to obtain the fft bar plot of the 5 level stepped sinusoidal wave which is the output of the 5 level cascaded multilevel inverter. I have changed the scope settings also to loggin>struct with time. I have tried changing the powergui to discrete as well with different time steps. Still i am not able to view anything in the FFT bar plot. Can anyone suggest any remedy for it or is there any setting problem in my MATLAB. I'm using MATLAB 2019 version.

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parvathy ss 2024-2-28

thank you

Shyju 2024-4-5，3:40

Thank you Sachu

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回答（4 个）

SALAH alatai 2021-5-31

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Go to model configuration parameters in "Data Import/Export" Section, you will find the option "Single simulation output" has been selected. remove the tick on single simulation output".

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Hari Babu 2022-7-10

Thanks alot. this helped me alot.

Yola Warnita 2022-7-14

what about matlab 2022a?, i can't bring up the fundamentals on fft analysis

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mohammad ebrahimy 2021-3-15

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the Answer is in the comments of post 👆

in case you didn't see it

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Eng. 2023-10-14

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In response to Mr. Salah's correct solution, I attach his solution steps with pictures. Thank you Mr. Sala

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Sri harshitha 2024-1-24

Thanks a lot

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Kaashyap Pappu 2019-7-26

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Hi,

Given that I have been unable to reproduce this issue, a possible workaround I have identified would be to connect the output of the “PS-Simulink Converter” to the “Scope”, check “Log Data to workspace” under the Logging tab and select “Save format” as an Array.

Run the model, and the logged data would appear as an array with 2 columns. Using the “fft” function and “bar” function, calculate the Fourier transform on the second column of the logged variable and obtain the bar plot. If the variable name is ScopedData, the second column can be accessed using ScopedData(:,2).

Use the “abs” function to obtain the magnitude of FFT. Note that "fft" returns a 2-sided spectrum.