Open AccessThree‐phase four‐leg flying‐capacitor multi‐level inverter‐based active power filter for unbalanced current operation
Author(s) -
Zhang Li,
Waite Michael J.,
Chong Benjamin
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.2012.0317
Subject(s) - pulse width modulation , capacitor , inverter , redundancy (engineering) , harmonic , electronic engineering , computer science , three phase , control theory (sociology) , engineering , compensation (psychology) , electrical engineering , voltage , control (management) , physics , acoustics , artificial intelligence , psychology , psychoanalysis , operating system
This study describes a new application of flying capacitor multi‐level inverters whereby a three‐phase, four‐leg three‐level inverter is used for harmonic current cancellation and unbalanced current compensation in a four‐wire system. A direct three‐dimensional‐pulse‐width modulation (3D‐PWM) scheme is developed to deal with the increased state redundancy in the four‐leg flying capacitor multi‐level inverter. Test results show much superior performance in the four‐leg case, which may allow the use of smaller DC supply capacitors. A new modified dead–beat current control algorithm is proposed and combined successfully with the 3D‐PWM modulation technique in a hardware demonstrator of a complete active filter.