Article
Variable-Angle Phase-Shifted PWM for Multilevel Three-Cell Cascaded H-bridge Converters
Author/s | Márquez Alcaide, Abraham
![]() ![]() ![]() ![]() ![]() ![]() León Galván, José Ignacio ![]() ![]() ![]() ![]() ![]() ![]() ![]() Vázquez Pérez, Sergio ![]() ![]() ![]() ![]() ![]() ![]() ![]() Portillo Guisado, Ramón Carlos ![]() ![]() ![]() ![]() ![]() ![]() ![]() García Franquelo, Leopoldo ![]() ![]() ![]() ![]() ![]() ![]() ![]() Freire Macías, Emilio ![]() ![]() ![]() ![]() ![]() ![]() ![]() Kouro, Samir |
Department | Universidad de Sevilla. Departamento de Ingeniería Electrónica Universidad de Sevilla. Departamento de Matemática Aplicada II |
Publication Date | 2017 |
Deposit Date | 2020-01-24 |
Published in |
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Abstract | Multilevel cascaded H-bridge converters have become a mature technology for applications where high-power medium ac voltages are required. Normal operation of multilevel cascaded H-bridge converters assumes that all power ... Multilevel cascaded H-bridge converters have become a mature technology for applications where high-power medium ac voltages are required. Normal operation of multilevel cascaded H-bridge converters assumes that all power cells have the same dc voltage, and each power cell generates the same voltage averaged over a sampling period using a conventional phase-shifted pulse width modulation (PWM) technique. However, this modulation method does not achieve good results under unbalanced operation per H-bridge in the power converter, which may happen in grid-connected applications such as photovoltaic or battery energy storage systems. In the paper, a simplified mathematical analysis of the phase-shifted PWM technique is presented. In addition, a modification of this conventional modulation method using variable shift angles between the power cells is introduced. This modification leads to the elimination of harmonic distortion of low-order harmonics due to the switching (triangular carrier frequency and its multiples) even under unbalanced operational conditions. The analysis is particularized for a three-cell cascaded H-bridge converter, and experimental results are presented to demonstrate the good performance of the proposed modulation method. |
Citation | Márquez Alcaide, A., León, J.I., Vázquez Pérez, S., Portillo Guisado, R.C., García Franquelo, L., Freire Macías, E. y Kouro, S. (2017). Variable-Angle Phase-Shifted PWM for Multilevel Three-Cell Cascaded H-bridge Converters. IEEE Transactions on Industrial Electronics, 64 (5), 3619-3628. |
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