Design and analysis of a novel quasi Z Source based asymmetric multilevel inverter for PV applications

Deepa Sankar, C A Babu


A novel Quasi Z source based Asymmetric Multilevel Inverter for Photovoltaic application is proposed in this paper. It consists of an Impedance source-based dc-dc converter and Asymmetric Multilevel Inverter (AMLI). Quasi Z source network can buck or boost the input DC voltage eliminating separate DC-DC boost converter. Multilevel Inverter topology with reduced number of switches and DC sources provides high quality output voltage with large number of levels at the output. The magnitude of the input DC voltage sources of the inverter is based on an algorithm. The system ensures high voltage gain, lower switching stress, reduced gate drive circuitry, high reliability and improved harmonic profile. Low THD values ensures reduced filter size and hence cost. The theoretical concepts and parameter design of the proposed converter are illustrated in detail. The performance analysis of the proposed topology is verified using Matlab/Simulink environment.

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