Open AccessDC link voltage balancing approach for cascaded H‐bridge active rectifier based on selective harmonic elimination‐pulse width modulation
Author(s) -
Moeini Amirhossein,
ImanEini Hossein,
Marzoughi Alinaghi
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.2014.0086
Subject(s) - rectifier (neural networks) , pulse width modulation , harmonic , h bridge , modulation (music) , voltage , control theory (sociology) , physics , electrical engineering , computer science , engineering , acoustics , control (management) , stochastic neural network , machine learning , artificial intelligence , recurrent neural network , artificial neural network
This study presents an improved voltage balancing strategy which can be employed on multilevel cascaded H‐bridge (CHB) rectifiers using low switching frequency. The proposed method balances the voltage of all DC links in a CHB rectifier to a predefined value, without increasing the number of switching transitions. The redundancy states which are available in the CHB rectifier to produce a voltage level are used to balance the DC links in each transition. Moreover, using the well‐known selective harmonic elimination‐pulse width modulation method, all current harmonic components up to 29th harmonic are eliminated in the three‐phase CHB rectifier, whereas the average switching frequency of each switch is limited to 150 Hz. The effectiveness and validity of the proposed strategy is verified by several simulations and experiments that are carried out on a 7‐level CHB rectifier.