Ammar Natsheh Thesis.pdf (8.61 MB)
Analysis, simulation and control of chaotic behaviour and power electronic converters
thesis
posted on 2010-01-05, 10:10 authored by Ammar Nimer NatshehThe thesis describes theoretical and experimental studies on the chaotic behaviour of a
peak current-mode controlled boost converter, a parallel two-module peak current-mode
controlled DC-DC boost converter, and a peak current-mode controlled power factor
correction (PFC) boost converter. The research concentrates on converters which do not
have voltage control loops, since the main interest is in the intrinsic mechanism of
chaotic behaviour.
These converters produce sub-harmonics of the clock frequency at certain values of the
reference current I[ref] and input voltage V[in], and may behave in a chaotic manner,
whereby the frequency spectrum of the inductor becomes continuous. Non-linear maps
for each of the converters are derived using discrete time modelling and numerical
iteration of the maps produce bifurcation diagrams which indicate the presence of subharmonics
and chaotic operation. In order to check the validity of the analysis,
MATLAB/SIMULINK models for the converters are developed.
A comparison is made between waveforms obtained from experimental converters, with
those produced by the MATLAB/SIMULINK models of the converters. The
experimental and theoretical results are also compared with the bifurcation points
predicted by the bifurcation diagrams. The simulated waveforms show excellent
agreement, with both the experimental waveforms and the transitions predicted by the
bifurcation diagrams.
The thesis presents the first application of a delayed feedback control scheme for
eliminating chaotic behaviour in both the DC-DC boost converter and the PFC boost
converter. Experimental results and FORTRAN simulations show the effectiveness and
robustness of the scheme. FORTRAN simulations are found to be in close agreement
with experimental results and the bifurcation diagrams.
A theoretical comparison is made between the above converters controlled using delayed
feedback control and the popular slope compensation method. It is shown that delayed feedback control is a simpler scheme and has a better performance than that for slope
compensation.
History
School
- Mechanical, Electrical and Manufacturing Engineering
Publisher
© A.N. Natsheh 2008Publication date
2008Notes
A doctoral thesis submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.EThOS Persistent ID
uk.bl.ethos.515578Language
- en