Optimal Design of a Flyback Microinverter Operating under Discontinuous-Boundary Conduction Mode (DBCM)

Georgios Christidis, Anastasios Nanakos and Emmanuel Tatakis
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Georgios Christidis: Laboratory of Electromechanical Energy Conversion, Department of Electrical and Computer Engineering, University of Patras, 26504 Patras, Greece
Anastasios Nanakos: Laboratory of Electromechanical Energy Conversion, Department of Electrical and Computer Engineering, University of Patras, 26504 Patras, Greece
Emmanuel Tatakis: Laboratory of Electromechanical Energy Conversion, Department of Electrical and Computer Engineering, University of Patras, 26504 Patras, Greece

Energies, 2021, vol. 14, issue 22, 1-17

Abstract: The flyback converter has been widely used in Photovoltaic microinverters, operating either in Discontinuous, Boundary, or Continuous Conduction Mode (DCM, BCM, CCM). The recently proposed hybrid DBCM operation inherits the merits of both DCM and BCM. In this work, the necessary analytical equations describing the converter operation for any given condition under DBCM are derived, and are needed due to the hybrid nature of the modulation strategy during each sinusoidal wave. Based on this analysis, a design optimization sequence used to maximize the weighted efficiency of the inverter under DBCM is then applied. The design procedure is based on a power loss analysis for each converter component and focuses on the appropriate selection of the converter parameters. To achieve this, accurate, fully parameterized loss models of the converter components are implemented. The power loss analysis is then validated by applying the optimization methodology to build an experimental prototype operating in DBCM.

Keywords: power electronics; renewable energy sources; DC-AC converters; energy efficiency; design methodology; photovoltaic power systems (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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