PV Cell based Single Stage Step-Up or Step-Down DC–AC Converter

Abstract

Single stage Buck/Boost inverter is an converter which performs two actions in a single stage. It boosts the DC voltage and invert to AC in a single stage. In Conventional two stage converter there will be two stages. The first stage will be a boost or buck boost DC-AC converter which is meant for conditioning and leveling the DC voltage approximately to invert to AC voltage required. The second stage will be an inverter, to invert the DC output obtained from first stage to AC voltage. This paper presents a new step-up/step-down DC-AC converter which is having application where an instantaneous voltage higher or lower than input DC voltage is required. It consists of one switching cell including two switches, two diodes, one inductor, and one capacitor on each inverter leg. . Validating the theoretical analysis, a prototype was designed, built, and tested for an output rated power of 1 kW, a dc input voltage of 96Vdc , and output voltage of 110 V rms. Furthermore, the fundamental output frequency was established at 60 Hz and the switching frequency at 20 kHz. Computer simulation by MATLAB/ SIMULINK has been used to support the developed concept.
Keywords: DC–AC converter; switching cell; Switched Capacitor circuit; Switched Capacitor