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Why space vector has overmodulation

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savage67

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Hi friends.

Is there any one who can explain that why over-modulation occurs in space modulation technique?.

i think, it is possible to acquire the resultant vector by summing the two adjacent so why over modulation????

Regards
 

Hello

In simple lines, the overmodulation is for the extra power (voltage) delivered to the output. Considering the 3phase-3line case, the triplen harmonics will be null, so over-modulating the waveforms with different techniques will give an extra bang for the buck at no cost seen from the load side, while also having smaller ripple on the DC storage device (where they're needed). It is deliberately so.

Vlad
 

How define you overmodulation in this case? For space vector maxim modulation index is about 86.6% one of highest in various PWM generation methods.
 

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