Open AccessModified space vector modulation for fault‐tolerant operation of multilevel cascaded H‐bridge inverters
Author(s) -
Aleenejad Mohsen,
ImanEini Hossein,
Farhangi Shahrokh
Publication year - 2013
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.2012.0543
Subject(s) - h bridge , inverter , converters , downtime , space vector modulation , modulation (music) , control theory (sociology) , voltage , fault (geology) , power (physics) , fault tolerance , engineering , computer science , electronic engineering , topology (electrical circuits) , electrical engineering , reliability engineering , physics , control (management) , artificial intelligence , acoustics , quantum mechanics , seismology , geology
In this study, fault‐tolerant operation of multilevel cascaded H‐bridge (CHB) inverters is presented and a novel switching strategy based on space vector modulation is proposed. A faulty power switch in high power converters can lead to expensive downtime, loss of productivity and increased costs. Various power switch faults and their influence on space vector diagram of CHB inverters are investigated. In the event of a fault, the output voltage of inverter is reduced and redundant switching states are used to generate balanced line‐to‐line voltages. By adding some devices to the basic structure, CHB inverter will operate with maximum achievable output voltage. Simulation and experimental results are shown for a five‐level CHB inverter to validate the proposed modulation technique.