Abstract
A new single phase nine level inverter with a Phase Disposition (PD) Pulse Width Modulated (PWM) control scheme is presented. The topology is self-voltage balanced across the series-connected capacitors. The inverter is capable of producing nine levels of output voltage levels (Vdc, 3Vdc/4, 2Vdc/4, Vdc/4, 0, −Vdc/4, −2Vdc/4, −3Vdc/4, −Vdc/4) from the dc supply voltage. For this, the proposed multilevel inverter needs a single dc voltage source with a series connection of four capacitors, three diodes, five active switches for synthesizing output voltage levels, and an H-bridge cell. The proposed approach helps in reducing the number of independent dc voltage sources. Also the harmonic content in the output voltage is very less when compared with conventional topologies.
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