A new DC/AC inverter with ability of supplying two AC loads, independently, based on flying-capacitor topology is proposed. Flying capacitor enables the converter to have three-level output voltages which results in high-quality output waveforms. Comparing to conventional flying capacitor inverter (FCI) for supplying two loads, the new inverter has lower numbers of semiconductor switches and flying capacitors, up to 25 and 50%, respectively. Comparing to recent works, proposed inverter provides better trade-off between number of components and independent control of loads. Three-phase topology of the proposed inverter consists of three parallel single-phase modules. The inverter can operate in both constant and variable output frequencies. A switched model along with an effective control strategy based on Karnauph Map is also derived for the proposed inverter. High performance of the inverter is verified with both simulation and experimental results. The proposed inverter can mostly be used in applications, such as motor drive, UPS systems, hybrid electric vehicles, and photovoltaic (PV) systems.
A new inverter topology for single-phase photovoltaic (PV) systems is proposed in this study. The proposed inverter offers a four-level voltage in its output terminals. This feature results in easier filtering in comparison with other conventional two-level or three-level inverters. In addition, the proposed four-level inverter (PFLI) has a transformer-less topology, which decreases the size, weight, and cost of the entire system and increases the overall efficiency of the system. Although the inverter is transformer-less, it produces a negligible leakage ground current (LGC), which makes this inverter suitable for PV grid-connected applications. The performance of the proposed inverter is compared with that of a four-level neutral point clamped inverter (FLNPCI). Theoretical analysis and computer simulations verify that the PFLI topology is superior to FLNPCI in terms of efficiency and suitability for use in PV transformer-less systems.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.