3Multilevel inverter topologies

Recently, the multilevel inverter technology has emerged as a very important alternative in the area of medium-voltage, high-power applications. As the name indicates, multilevel inverters can produce more than two levels at its output phases. Multilevel inverters also provide benefits such as improved output voltage spectrum. Multilevel inverters offer many benefits for higher-power applications. In particular, these include the ability to synthesize voltage waveform with lower harmonic content than two-level inverters and operation at higher dc voltages using series-connected semiconductor switches. Multilevel inverters with neutral point-clamped (NPC) or diode-clamped technology were introduced in 1980. In the ...

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