An Improved Module Power Balance Modulation Method for 9-Level Cascaded Multilevel Inverters

Résumé fourni par la source

Although the traditional Phase Disposition (PD) carrier modulation strategy applied to Cascaded H-Bridge (CHB) multilevel inverters offers optimal output voltage harmonic characteristics, it suffers from unbalanced output power among the cascaded units. To address this issue, a novel carrier-adjusted power-balancing modulation strategy is proposed. Targeting a four-unit CHB inverter, this strategy reconstructs new carrier adjustment cycles by modifying the vertical arrangement of standard carriers based on the traditional PD modulation. Detailed derivations are provided for the output voltage expressions and the amplitudes of the fundamental components of all cascaded units across the full modulation ratio range. Analysis from the perspective of fundamental component amplitudes demonstrates that this method achieves power balancing control within one output cycle. Finally, simulations and experiments verify the correctness and feasibility of the proposed control method.

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