Abstract
In this paper, two different converter topologies for a basic new switched capacitor diode converter with a reduced number of power electronics components, suitable for grid connected photovoltaic applications were proposed. The two different structures of switched diode multilevel converter proposed were: (i) cascaded switched diode and (ii) cascaded switched diode with doubling circuit. The switched-diode multilevel converter was compared with other recent converters. In addition, a new dc offset nearest level modulation technique was proposed. This proposed dc offset technique offers low voltage total harmonic distortion (THD) and high RMS output voltage. The proposed modulation technique was compared with conventional nearest level modulation (NLM) and modified NLM control techniques. The performance of the proposed dc offset modulation technique was implemented using a FPGA Spartan 3E controller and tested with a novel switched capacitor-diode multilevel converter. However, to prove the authenticity of the switched-diode multilevel converter and modulation technique, a laboratory-based prototype model for 7-level and 13-level converters was developed.
Highlights
The multilevel converter is a promising power electronic converter for DC–AC high-power applications because it offers low electromagnetic interference (EMI), low dv/dt stress, and high efficiency
Several multilevel converters were recently proposed for are reduced number of dc sources and switches [4,5,6,7,8]. Another switched diode topology is presented in Reference [4], which requires single DC source and series connected DC-link capacitors to generate the maximum number of output voltage levels
In order to increase the output voltage level, the cascaded connection is recommended
Summary
The multilevel converter is a promising power electronic converter for DC–AC high-power applications because it offers low electromagnetic interference (EMI), low dv/dt stress, and high efficiency. Several multilevel converters were recently proposed for are reduced number of dc sources and switches [4,5,6,7,8] Another switched diode topology is presented in Reference [4], which requires single DC source and series connected DC-link capacitors to generate the maximum number of output voltage levels. These topologies have high blocking voltage stresses across the full bridge converter switches. In order to increase the number of output voltage level, a cascaded connection of basic unit with and without half-bridge converter are presented and a comparison of the proposed multilevel converter with other recent topologies is made.
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