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Energies 2017, 10(9), 1327; doi:10.3390/en10091327

An Improved Modulation Strategy Combining Phase Shifted PWM and Phase Disposition PWM for Cascaded H-Bridge Inverters

College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
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Received: 10 July 2017 / Revised: 23 August 2017 / Accepted: 30 August 2017 / Published: 2 September 2017
(This article belongs to the Special Issue Advanced Control Techniques for Power Converters)
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Abstract

Abstract: Multilevel modulation strategy is an important factor affecting the output performance of multilevel converters. In this paper, the relationship between phase-shifted pulse width modulation (PWM) and phase disposition PWM is analyzed, and then an improved hybrid modulation strategy is proposed for cascaded H-bridge. In addition, the implementation method of multilevel discontinuous modulation for an improved modulation strategy is described. The new modulation strategy is optimized to increase the DC link voltage utilization and further improvement in output harmonics by the injection of a common voltage into the reference. Simulation and experiment verify the effectiveness of the proposed modulation strategy. View Full-Text
Keywords: cascaded H-bridge inverter; pulse width modulation; power conversion harmonics cascaded H-bridge inverter; pulse width modulation; power conversion harmonics
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Xiao, M.; Xu, Q.; Ouyang, H. An Improved Modulation Strategy Combining Phase Shifted PWM and Phase Disposition PWM for Cascaded H-Bridge Inverters. Energies 2017, 10, 1327.

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