Extendable multicell improved L-Z-source inverter

Abstract

This paper proposes an improved L-Z-source inverter (L-ZSI), which is derived from L-ZSI with addition of two switching devices, one diode and one capacitor. The improved LZSI gives higher boost ability at low shoot-through duty region compared to the L-ZSI and overcome the limitations of L-ZSI. Another advantage of the proposed inverter is its expandability as same as L-ZSI. To achieve higher boosting rate further at low shoot-through region, additional cells (three diodes and one inductor) can easily cascaded at the switched-inductor cell. A 100 W laboratory prototype is developed to validate the performance of the proposed inverter simulations are shown to verify the expandability of proposed inverter.