Multilevel modulation strategy is an important factor affecting the output performance of\nmultilevel converters. In this paper, the relationship between phase-shifted pulse width modulation\n(PWM) and phase disposition PWM is analyzed, and then an improved hybrid modulation strategy is\nproposed for cascaded H-bridge. In addition, the implementation method of multilevel discontinuous\nmodulation for an improved modulation strategy is described. The new modulation strategy is\noptimized to increase the DC link voltage utilization and further improvement in output harmonics\nby the injection of a common voltage into the reference. Simulation and experiment verify the\neffectiveness of the proposed modulation strategy.
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