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Three-phase four-wire Buck-Boost Modular Converter with Active Power Filter Functionality

F. Barrero-González, M.I. Milanés-Montero, Eva González-Romera, C. Roncero-Clemente, J. Gutiérrez-Escalona, and E. Romero-Cadaval

Department of Electrical, Electronic and Automatic Engineering,
Escuela de Ingenierías Industriales, Universidad de Extremadura,
Badajoz (Spain)

2026-02-15

This study enhances the buck-boost modularconverter topology, also known as the Y-voltage source inverter, by implementing a control strategy that simultaneously manages active power injection into the grid while functioning as a shunt active power filter. Each phase-module operates as an independent buck-boost dc-dc converter, allowing the converter to accommodate wide variations in photovoltaic (PV) voltage. The control strategy is derived from instantaneous id-iq power theory and employs a dead-beat-type current control, which is developed and validated. Simulation tests confirm the converter's efficiency as an Active Power Filter (APF) under unbalanced and distorted grid voltage conditions.

Key words: Four-wire converters, Hybrid microgrid, Three-phase dc–ac converter, Universal converter, Active power filter.

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