Increasing the Range of Modulation Indices with the Polarities of Cells and Switching Constraint Reliefs for the Selective Harmonic Elimination Pulse Width Modulation Technique

Mohammad Najjar; Hossein Iman-Eini; Amirhossein Moeini

Increasing the Range of Modulation Indices with the Polarities of Cells and Switching Constraint Reliefs for the Selective Harmonic Elimination Pulse Width Modulation Technique

Mohammad Najjar

Hossein Iman-Eini

Amirhossein Moeini

Vol. 17, No. 4, pp. 933-941, Jul. 2017

10.6113/JPE.2019.17.4.933

Cascaded H-bridge

Multilevel converter

Particle Swarm Optimization

Selective harmonic elimination

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Abstract

In this paper an improved low frequency selective harmonic elimination-PWM (SHE-PWM) technique for Cascaded H-bridge (CHB) converters is proposed. The proposed method is able to eliminate low order harmonics from the output voltage of the converter for a wide range of modulation indices. To solve SHE-PWM equations, especially for low modulation indices, a modified method is used which employs either the positive or negative voltage polarities of H-bridge cells to increase the freedom degrees of each cell. Freedom degrees of the switching angles are also used to increase the range of available solutions for non-linear SHE equations. The proposed SHE methods can successfully eliminate up to 25th harmonic from a 7-level output voltage by using just nine switching transitions or a 150 Hz switching frequency. To confirm the validity of the proposed method, simulation and experimental results have been presented.

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Cite this article

[IEEE Style]

M. Najjar, H. Iman-Eini, A. Moeini, "Increasing the Range of Modulation Indices with the Polarities of Cells and Switching Constraint Reliefs for the Selective Harmonic Elimination Pulse Width Modulation Technique," Journal of Power Electronics, vol. 17, no. 4, pp. 933-941, 2017. DOI: 10.6113/JPE.2019.17.4.933.

[ACM Style]

Mohammad Najjar, Hossein Iman-Eini, and Amirhossein Moeini. 2017. Increasing the Range of Modulation Indices with the Polarities of Cells and Switching Constraint Reliefs for the Selective Harmonic Elimination Pulse Width Modulation Technique. Journal of Power Electronics, 17, 4, (2017), 933-941. DOI: 10.6113/JPE.2019.17.4.933.