TITLE:
Indirect Output Voltage Control in Negative Output Elementary Super Lift Luo Converter Using PIC plus FLC in Discontinuous Conduction Mode
AUTHORS:
S. Muthukaruppasamy, A. Abudhahir
KEYWORDS:
Negative Output Elementary Super Lift Luo Converter (NOESLLC), Discontinuous Conduction Mode (DCM), Fuzzy Logic Controller (FLC), Proportional-Integral Con-troller (PIC)
JOURNAL NAME:
Circuits and Systems,
Vol.7 No.11,
September
13,
2016
ABSTRACT: In this paper, the design of a proportional integral controller (PIC)
plus fuzzy logic controller (FLC) for the negative output elementary super lift
Luo converter (NOESLLC) operated in discontinuous conduction mode (DCM) is
presented. In spite of the many benefits viz.
the high voltage transfer gain, the high efficiency, and the reduced inductor
current and the capacitor voltage ripples, it natured with non-minimum phase.
This characteristic makes the control of NOESLLC cumbersome. Any attempt of
direct controlling the output voltage may erupt to instability. To overcome
this problem, indirect regulation of the output voltage based on the two-loop
controller is devised. The savvy in the inductor current control improves the
dynamic response of the output voltage. The FLC is designed for the outer
(voltage) loop while the inner (current) loop is controlled by the PIC. For the
developed ?19.6 V NOESLLC, the dynamic performances for different perturbations (line,
load and component variations) are obtained for PIC plus FLC and compared with
PIC plus PIC. The study of two cases is performed at various operating regions
by developing the MATLAB/Simulink model.