Seven Level Hybrid Cascaded H-Bridge Multilevel Inverter
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IJERTV9IS010067
Seven Level Hybrid Cascaded H-Bridge Multilevel Inverter
Jithin Kumar , Arun Xavier , Gec Sreekrishnapuram
The poor quality of voltage and current of a PWM inverter fed induction machine is due to the presence of har- monics and hence there is significant level of energy losses. The Multilevel inverter is used to reduce the harmonics. The inverters with a large number of steps can generate high quality voltage waveforms.A cascaded H- bridge multilevel inverter that can be implemented using only a single dc power source and capacitors. Standard cascaded multilevel inverters require n dc sources for 2n
1 levels. Without requiring transformers, the scheme proposed here allows the use of a single dc power source with the remaining n-1 dc sources being capacitors .which is referred to as hybrid cascaded H-bridge multilevel inverter. HCMLI using only a single dc source for each phase is promising for high- power Motor drive applications, as it significantly decreases the number of required dc power supplies, provides high-quality output power due to its high number of output levels, and results in high conversion efficiency and low thermal stress as it uses a fundamental frequency switching scheme. The number of switches can also be reduced from the previous topologies by using this method. .
