Open AccessOptimised phase disposition pulse‐width modulation strategy for hybrid‐clamped multilevel inverters using switching state sequences
Author(s) -
Ma Mingyao,
He Xiangning,
Cao Wenping,
Song Xueguan,
Ji Bing
Publication year - 2015
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2014.0748
Subject(s) - pulse width modulation , modulation (music) , pulse (music) , phase (matter) , state (computer science) , electronic engineering , control theory (sociology) , materials science , computer science , voltage , physics , engineering , electrical engineering , acoustics , algorithm , control (management) , quantum mechanics , artificial intelligence
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.