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Need help with an inverter (Matlab)?

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abdulwahed

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any prof. in Matlab

salam
how are you ?
i am graduate student in AAST in EGYPT. i build three phase inverter by using IGBT devices and using PWM operation to get the output of the inverter by using Simulink in Matlab.

my problem, that is must be no even harmonics exist in the output waveform, just only odd harmonics and so on... but when i scope in the output i note that not symmetrical waveform (pulses), there is shift in the output.... i dont why..

i used the blocks in the toolboxes ,,, also there is the same result ... please sir help me to solve this problem...

this is the data.. fund. freq=50Hz, carrier freq.=49950Hz, modulation index (ma=0.4), Vdc=400v.

please help me .. i wait..

eng. abdulwahed
 

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