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Generalized Cascaded Symmetric and Level Doubling Multilevel Converter Topology with Reduced THD for Photovoltaic Applications

SRM Institute of Science and Technology, Kattankulathur 603203, India
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Electronics 2019, 8(2), 161; https://doi.org/10.3390/electronics8020161
Received: 1 October 2018 / Revised: 31 December 2018 / Accepted: 11 January 2019 / Published: 1 February 2019
(This article belongs to the Special Issue Applications of Power Electronics)
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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. View Full-Text
Keywords: multilevel inverter; cascaded topology; voltage doubling; switched capacitor; nearest level modulation (NLM); total harmonic distortion (THD) multilevel inverter; cascaded topology; voltage doubling; switched capacitor; nearest level modulation (NLM); total harmonic distortion (THD)
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D, K.; K, V.; M, J.S. Generalized Cascaded Symmetric and Level Doubling Multilevel Converter Topology with Reduced THD for Photovoltaic Applications. Electronics 2019, 8, 161.

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