Abstract:
A new three-phase topology for low- and medium-voltage systems with fewer components is proposed in this research. Three bidirectional and twelve unidirectional switches produce four-level voltages without flying capacitors or clamping diodes, saving size, cost, and losses.
Removing flying capacitors and clamping diodes simplifies control algorithms and improves reliability, efficiency, and longevity. A modified low-frequency modulation (LFM) scheme is applied on the proposed topology to generate a four-step staircase voltage.
Level-shifted pulse width modulation (LSPWM) reduces filter size and increases output voltage controllability. This work balances DC-link capacitor voltages using a voltage balancing management method.
The proposed topology is evaluated numerically and experimentally using an in-house test setup. Power loss distribution in switches and conversion efficiency of the suggested circuit are analyzed, and a comparison research highlights its essential aspects.
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