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Those who have some familiarity with the operational characteristics of the M2LC will know that it is not perform well when operated at low frequency. In fact without modification to the carrier that generates the multilevel PWM references, it is not possible to control DC current using this converter.

This paper proposes the addition of a special resonance mode to allow the converter to transfer power at low frequency or DC conditions.

M2LC Operating in Resonance Mode

The document has been updated to Rev. C to fix some small problems relative to the simulation described in section Resonance Operation at Intermediate Levels. Here, excessive turn-on losses in the simulated switches caused higher then normal discharging of the link capacitors. Also changes have been made to add a missing credit and to release all information in this document to the public domain.

A paper has been added to gain some insight into the operation of a 3-phase M2LC in resonance mode, under more realistic conditions where impedance is present in both the plus and minus bus connections.

HighPerformanceM2LCResonanceMode_BusAnalysis

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