Reduction of DC Capacitor Size in Three-Phase Input/Single-Phase Output Power Cells of Multi-Cell Converters through Resonant and Predictive Control: A Characterization of Its Impact on the Operating Region

Roberto O. Ramírez, Carlos R. Baier (), Felipe Villarroel, Eduardo Espinosa, Mauricio Arevalo and Jose R. Espinoza
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Roberto O. Ramírez: Electrical Engineering Deparment, University of Talca, Curicó 3340000, Chile
Carlos R. Baier: Electrical Engineering Deparment, University of Talca, Curicó 3340000, Chile
Felipe Villarroel: Department of Electrical Engineering, Universidad de Concepción, Concepción 4070386, Chile
Eduardo Espinosa: Department of Electrical Engineering, Faculty of Engineering, Universidad Católica de la Santísima Concepción, Concepción 4090541, Chile
Mauricio Arevalo: Energy Conversion Master Program, Faculty of Engineering, University of Talca, Curicó 3340000, Chile
Jose R. Espinoza: Department of Electrical Engineering, Universidad de Concepción, Concepción 4070386, Chile

Mathematics, 2023, vol. 11, issue 14, 1-19

Abstract: Cascaded H-bridge drives require using a significant-size capacitor on each cell to deal with the oscillatory power generated by the H-bridge inverter in the DC-link. This results in a bulky cell with reduced reliability due to the circulating second harmonic current through the DC-link capacitors. In this article, a control strategy based on a finite control set model predictive control and a proportional-resonant controller is proposed to compensate for the oscillatory power required by the H-bridge inverter through the cell’s input rectifier. With the proposed strategy, a DC-link second harmonic free operation is achieved, allowing for the possibility of reducing the capacitor size and, in consequence, the cell dimensions. The feasibility of the proposed control scheme is verified by experimental results in one cell of a cascade H-bridge inverter achieving an operation with a capacitance 141 times smaller than required by conventional control approaches for the same voltage ripple.

Keywords: predictive control; FCS-MPC; resonant control; MLI (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2023
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