Cascaded H-Bridge Inverter with Minimum Switches Using Hybrid Modulation Technique
|Preethi M.P1, Dr.K.Sebasthirani2
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The power extracted from renewable energy resources has some limitations that are occurred due to the weather changes and scarcity of sources. The power demand and scarcity can be minimized by improving the power extracting methods. Multilevel inverter requires several number of dc sources for synthesizing the ac output voltage waveform. Therefore a new method of multilevel inverter with reduced number of switches has been designed that uses hybrid modulation technique where it is the combination of Fundamental Frequency Pulse Width Modulation (FPWM) and Multi Sinusoidal Pulse Width Modulation MSPWM for each inverter cell operation that is processed by sequential switching pulse which reduces the power loss and conduction loss. This proposed designed with reduced number of switches, the conduction and switching losses gets decreased, which leads to increase the efficiency of the inverter. The size and power consumption in the driving circuits can also be minimized. This structure minimizes the Total Harmonic Distortion (THD) of the output voltage waveforms.