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This paper proposes a switched-capacitor multilevel
inverter for high frequency AC power distribution systems. The proposed
topology produces a staircase waveform with higher number of output levels
employing fewer components compared to several existing switched capacitor
multilevel inverters in the literature. This topology is beneficial where
asymmetric DC voltage sources are available e.g. incase of renewable energy
farms based AC microgrids and modern electric vehicles. Utilizing the available
DC sources as inputs for a single inverter solves the major problem of
connecting several inverters in parallel. Additionally, the need to stack
voltage sources, like batteries or super-capacitors, in series which demand charge
equalization algorithms, are eliminated as the voltage sources employed share a
common ground. The inverter inherently solves the problem of capacitor voltage balancing
as each capacitor is charged to the value equal to one of input voltage every
cycle. State analysis, losses and the selection of capacitance are examined.
Simulation and experimental results at different distribution frequencies, power
levels and output harmonic content are provided to demonstrate the feasibility
of the proposed multilevel inverter topology.
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