Abstract
Multilevel inverters have more prominent features than 2-level inverter due to various advantages like voltage quality, low EMI etc. The semi cross switched multilevel converter topology need less number of semiconductor switches compared to cascaded H-bridge multilevel inverter, and can be implemented to any number of voltage levels. The operating modes of 7-level semi cross switched multi level inverter are discussed. Three phase seven level inverter fed induction motor is implemented in MATLAB/SIMULINK.
Highlights
A day’s multilevel inverters grab the attention of researchers due to the various advantages like quality output waveform, low EMI, low THD and are suitable for low and medium voltage industrial applications
The main topologies of cascade H bridge is symmetrical with equal voltage sources and asymmetrical with unequal DC sources
The problem with asymmetrical topologies is that some switches have to process through main part of voltage so some high voltage switches are required
Summary
A day’s multilevel inverters grab the attention of researchers due to the various advantages like quality output waveform, low EMI, low THD and are suitable for low and medium voltage industrial applications. Many multi-level inverter topologies are proposed and popular among them are the neutral point clamped [2], [3], flying capacitor [4], and cascaded H-bridge [5] structures, neutral point clamped and Flying capacitor multilevel inverters require complex circuitry with the increase in number of levels. The main topologies of cascade H bridge is symmetrical with equal voltage sources and asymmetrical with unequal DC sources. The cascaded H-bridge(CHB) inverters are more interested due to the greater demand of medium-voltage high-power inverters.
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