Lookup NU author(s): Dr Mingyao Ma,
Professor Xiangning He,
Dr Wenping Cao,
Dr Xueguan Song,
Dr Bing Ji
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© The Institution of Engineering and Technology 2015.This study describes an optimised modulation strategy based on switching state sequences for the hybridclamped 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.
Author(s): Ma M, He X, Cao W, Song X, Ji B
Publication type: Article
Publication status: Published
Journal: IET Power Electronics
Online publication date: 06/07/2015
Acceptance date: 28/12/2014
ISSN (print): 1755-4535
ISSN (electronic): 1755-4543
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