What is the difference between FFT analysis for Matlab and PSCAD?

Discussion in 'Homework Help' started by Soo Chin Chong, Aug 24, 2016.

  1. Soo Chin Chong

    Thread Starter New Member

    Aug 24, 2016
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    0
    I using Matlab and PSCAD for design active power filter. However, the simulation results for both software is same but the THD value from FFT is different. For PSCAD I getting 3.45% THD but for Matlab is about 10%. May I know why these conditions happen??
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,014
    3,234
    You'd have to look at what equations they use to calculate the FFT to determine the difference.
     
  3. WBahn

    Moderator

    Mar 31, 2012
    17,747
    4,796
    Another possibility: Are you sure that the simulation results are the same? Exactly the same? Or do they just look close enough visually and it's just a matter of not being able to distinguish the difference between those two levels of distortion?
     
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