An Improved Phase-Shifted Carrier Pulse Width Modulation Based on the Artificial Bee Colony Algorithm for Cascaded H-Bridge Multilevel Inverters

Xinjian Cai; Zhenxing Wu; Quanfeng Li; Shuxiu Wang

An Improved Phase-Shifted Carrier Pulse Width Modulation Based on the Artificial Bee Colony Algorithm for Cascaded H-Bridge Multilevel Inverters

Vol. 16, No. 2, pp. 512-521, Mar. 2016

10.6113/JPE.2016.16.2.512

Artificial bee colony algorithm

Cascaded H-bridge multilevel (CHBML) inverter

Phase-shifted carrier pulse width modulation (PSCPWM)

Unequal dc voltages

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Abstract

Cascaded H-bridge multilevel (CHBML) inverters usually include a large number of isolated dc-voltage sources. Some faults in the dc-voltage sources result in unequal cell dc voltages. Unfortunately, the conventional phase-shifted carrier (PSC) PWM method that is widely used for CHBML inverters cannot eliminate low frequency sideband harmonics when the cell dc voltages are not equal. This paper analyzes the principle of sideband harmonic elimination, and proposes an improved PSCPWM that can eliminate low frequency sideband harmonics under the condition of unequal dc voltages. In order to calculate the carrier phases, it is necessary to solve transcendental equations for low frequency sideband harmonic elimination. Therefore, an approach based on the artificial bee colony (ABC) algorithm is presented in this paper. The proposed PSCPWM method enhances the reliability of CHBML inverters. The proposed PSCPWM is not limited to CHBML inverters. It can also be applied to other types of multilevel inverters. Simulation and experimental result obtained from a prototype CHBML inverter verify the theoretical analysis and the achievements made in this paper.

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Cite this article

[IEEE Style]

X. Cai, Z. Wu, Q. Li, S. Wang, "An Improved Phase-Shifted Carrier Pulse Width Modulation Based on the Artificial Bee Colony Algorithm for Cascaded H-Bridge Multilevel Inverters," Journal of Power Electronics, vol. 16, no. 2, pp. 512-521, 2016. DOI: 10.6113/JPE.2016.16.2.512.

[ACM Style]

Xinjian Cai, Zhenxing Wu, Quanfeng Li, and Shuxiu Wang. 2016. An Improved Phase-Shifted Carrier Pulse Width Modulation Based on the Artificial Bee Colony Algorithm for Cascaded H-Bridge Multilevel Inverters. Journal of Power Electronics, 16, 2, (2016), 512-521. DOI: 10.6113/JPE.2016.16.2.512.