Comparative Analysis of Asymmetrical Multilevel Inverter Topologies

Abstract: In this paper a comparative analysis of Asymmetrical 7-level inverter topologies suitable for photovoltaic system is offered. The analysis is done on the base of cost, components, control strategy and efficiency. Various topologies for comparative study are:(i) Conventional Asymmetrical Cascaded H-bridge topology-1(ii) H-bridge with AMLI topology-2 (iii) H-bridge with AMLI topology-3 and (iv) Boost AMLI topology-4.These topologies are used in medium as well as high voltage application. The comparative analysis investigated for the asymmetrical multilevel inverter topologies suitable for the photovoltaic system. The comparative analysis is verified via simulation study of each topology using MATLAB/ Simulink. Also the proposed topology is implemented in a prototype. The switching signals are generated using micro controller SST89E516RD.

Keywords: Multilevel Inverter (MLI), Photovoltaic (PV), cascaded H-bridge( CHB), Asymmetrical Multilevel Inverter (AMLI).