Optimised phase disposition pulse-width modulation strategy for hybrid-clamped multilevel inverters using switching state sequences

Ma, Mingyao, He, Xiangning, Cao, Wenping, Song, Xueguan and Ji, Bing (2015). Optimised phase disposition pulse-width modulation strategy for hybrid-clamped multilevel inverters using switching state sequences. IET Power Electronics, 8 (7), pp. 1095-1103.

Abstract

This study describes an optimised modulation strategy based on switching state sequences for the hybrid-clamped multilevel converter. Two key control variables defined as 'phase shift angle' and 'switching state change' for a five-level hybrid-clamped inverter are proposed to improve all switches' operation, and by changing their values, different control methods can be obtained for modulation optimisation purposes. Two example methods can solve the voltage imbalance problem of the dc-link capacitors and furthermore avoid two switches' simultaneous switching transitions and improve the inverter's performance as compared with the traditional phase disposition pulse-width modulation strategy. A 6 kW prototype inverter is developed and a range of simulation and experiments are carried out for validation. It is found that simulation and experimental results are in a good agreement and the proposed modulation strategy is verified in terms of low-order harmonic reduction.

Publication DOI: https://doi.org/10.1049/iet-pel.2014.0748
Divisions: Engineering & Applied Sciences
Additional Information: © 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Published Date: 2015-07-31
Authors: Ma, Mingyao
He, Xiangning
Cao, Wenping ( 0000-0002-8133-3020)
Song, Xueguan
Ji, Bing

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