Open AccessCoexistence of fast‐scale and slow‐scale instability in ĆUK power factor correction AC–DC pre‐regulators under non‐linear current‐mode control
Author(s) -
ParvathyShankar Deivasundari,
Govindarajan Uma,
Mallapu Gopinath Umamaheswari,
Anbukumar Kavitha
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.2012.0156
Subject(s) - control theory (sociology) , converters , bifurcation , instability , power factor , power (physics) , scale (ratio) , distortion (music) , period doubling bifurcation , stability (learning theory) , computer science , physics , mathematics , mechanics , control (management) , nonlinear system , telecommunications , bandwidth (computing) , quantum mechanics , artificial intelligence , amplifier , machine learning
Power factor correction (PFC) converters using conventional control strategies have been reported tremendously as exhibiting slow‐ and fast‐scale bifurcations. This study investigates the fast‐scale and slow‐scale instabilities in a PFC ĆUK converter under non‐linear carrier (NLC) control, which is proved advantageous compared with other conventional control strategies. It is found that the fundamental periodic orbit loses its stability via period‐doubling bifurcation and later bifurcates to chaos. Bifurcation studies of NLC controlled higher‐order converters have not been reported so far in literature. Computer simulations as well as experimental investigations are performed to study the qualitative behaviour of the system under variations of different parameters. It is found that both the fast‐ and slow‐scale instabilities may cause distortion in the line current and degrade the supply power factor. The results offer useful information of parameter space for the design and operation of the converter in the desired fundamental stable regime.