A Single-Phase Doubly-Excited DC-AC Buck-Boost Converter Suitable for Feeding AC Loads from PV Systems

摘要

This paper presents a new topology for converting a DC voltage to an AC one. The proposed converter is excited from two separate DC supplies so the term "Doubly-Excited". The most important features of the proposed converter are the output voltage (AC Voltage) is lower or higher than the input one (DC Voltage), controllable voltage and frequency, and the output voltage and current are approximately sinusoidal which means low harmonics content. Also, the paper presents the simulation of the proposed converter in different modes of operation under control to show the effectiveness of the proposed control.