The voltage vector formed by SVPWM can usually be divided into three sections:
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Linear region
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Zone I (focus more on phase and change amplitude)
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Zone II (focus more on amplitude and change phase)
My personal understanding of overmodulation is that when the reference voltage output by the controller exceeds the maximum voltage vector that the inverter can generate, the reference voltage needs to be adjusted manually.
Figure 1
Zone I
The reference voltage is between the maximum inscribed circle and the circumscribed circle. The extreme case is that the reference voltage track is the circumscribed circle. At this time, except for the 6 vertices of the regular hexagon, other positions cannot be synthesized normally.
In this interval, the priority of voltage phase is often higher than that of amplitude, so the time reference voltage is usually pulled directly to the intersection of the reference voltage and the regular hexagon, so the actual voltage trajectory is a regular hexagon.
At this time, the projection on the horizontal axis needs to be processed by FFT to extract the fundamental wave value. (I haven't calculated it here)
Zone II
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