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Simulink vector space alpha beta transformation

  1. Aug 29, 2015 #1

    Cdz

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    << Thread moved to the HH forums from the technical engineering forums, so no HH Template is shown >>

    The model:
    model.PNG
    reference generation subsystem.png
    The goal:
    1. Create a three phase voltage
    2. Do a alpha-beta transformation
    3. Do a Cartesian to Polar transformation
    4 Check the output angle
    The expected result:
    Since the space vector rotates counter-clock wise the angle should from 0 to 180o and drop to -180o(instantly!) and rise again and repeat.
    But the actual result is:
    result.PNG
    As you can see it does not reach 180 or -180 sometimes..I need your help.
     

    Attached Files:

    Last edited by a moderator: Aug 30, 2015
  2. jcsd
  3. Aug 30, 2015 #2

    Cdz

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    I changed three phase voltage generation part to a Three Phase Sine Generator and the angle output is as I expected.
    So the problem lies in three phase voltage generation.
    But i can not figure out how that is wrong. Help!
     
  4. Aug 31, 2015 #3

    Cdz

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    Problem solved. The problem is that the scope is running with too low a sample rate. I changed the sample rate from 0.01(default) to 0.00002 and the result is good.
     
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