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[SOLVED] Bipolar Switching Scheme on a Multilevel inverter

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Shinnster

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Hello!
I tried to simulate a multilevel inverter (7 lvls)
on MATLAB Simulink using Bipolar switching (PWM) - Cascaded h-bridge inverters (3 of them).

if I tried to simulate with just 1, I do get the result as shown in the link below on page 233:
http://www.ijareeie.com/upload/october/3_Design and Implementation.pdf

(P.S: Link's a free journal?)

For multi-level I used phase shifted carrier PWM approach of 180/n.

I do manage to get a fairly decent result but the problem was at or near 0 point of Sine wave, it fluctuates between Vdc and -Vdc so the waveform looks awkward. Any suggestion to reduce this?

Thanks :] Unipolar was more straightforward and worked well using the same approach.

:bang:
 

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