A new interleaved three phase single-stage pfcac–dc converter with flying capacitor

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IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT
A NEW INTERLEAVED THREE-PHASE SINGLE-STAGE PFC AC–DC CONVERTER
WITH FLYING CAPACITOR
By
A
PROJECT REPORT
Submitted to the Department of electronics & communication Engineering in the
FACULTY OF ENGINEERING & TECHNOLOGY
In partial fulfillment of the requirements for the award of the degree
Of
MASTER OF TECHNOLOGY
IN
ELECTRONICS & COMMUNICATION ENGINEERING
APRIL 2016

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CERTIFICATE
Certified that this project report titled “A NEW INTERLEAVED THREE-PHASE SINGLE-
STAGE PFC AC–DC CONVERTER WITH FLYING CAPACITOR” is the bonafide work
of Mr. _____________Who carried out the research under my supervision Certified further, that
to the best of my knowledge the work reported herein does not form part of any other project
report or dissertation on the basis of which a degree or award was conferred on an earlier
occasion on this or any other candidate.
Signature of the Guide Signature of the H.O.D
Name Name

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DECLARATION
I hereby declare that the project work entitled “A NEW INTERLEAVED THREE-PHASE
SINGLE-STAGE PFC AC–DC CONVERTER WITH FLYING CAPACITOR” Submitted
to BHARATHIDASAN UNIVERSITY in partial fulfillment of the requirement for the award of
the Degree of MASTER OF APPLIED ELECTRONICS is a record of original work done by me
the guidance of Prof.A.Vinayagam M.Sc., M.Phil., M.E., to the best of my knowledge, the
work reported here is not a part of any other thesis or work on the basis of which a degree or
award was conferred on an earlier occasion to me or any other candidate.
(Student Name)
(Reg.No)
Place:
Date:
ACKNOWLEDGEMENT

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I am extremely glad to present my project “A NEW INTERLEAVED THREE-PHASE
SINGLE-STAGE PFC AC–DC CONVERTER WITH FLYING CAPACITOR” which is a
part of my curriculum of third semester Master of Science in Computer science. I take this
opportunity to express my sincere gratitude to those who helped me in bringing out this project
work.
I would like to express my Director, Dr. K. ANANDAN, M.A.(Eco.), M.Ed., M.Phil.,(Edn.),
PGDCA., CGT., M.A.(Psy.) of who had given me an opportunity to undertake this project.
I am highly indebted to Co-Ordinator Prof. Muniappan Department of Physics and thank from
my deep heart for her valuable comments I received through my project.
I wish to express my deep sense of gratitude to my guide
Prof. A.Vinayagam M.Sc., M.Phil., M.E., for her immense help and encouragement for
successful completion of this project.
I also express my sincere thanks to the all the staff members of Computer science for their kind
advice.
And last, but not the least, I express my deep gratitude to my parents and friends for their
encouragement and support throughout the project.

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ABSTRACT:
Anew interleaved three-phasePFCac–dc single-stage multilevel is proposed in this paper.
The proposed converter can operate with reduced input current ripple and peak switch currents
due to its interleaved structure, a continuous output inductor current due to its three-level
structure, and improved light-load efficiency as some of its switches can be turned ON softly. In
the paper, the operation of the converter is explained, the steady-state characteristics of the new
converter are determined, and its design is discussed. The feasibility of the new converter is
confirmed with experimental results obtained from a prototype converter, and its efficiency is
compared to that of another multilevel converter of similar type

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INTRODUCTION:
PFC techniques can generally be classified as:
1) Passive methods that use inductors and capacitors to filter out low-frequency input
current harmonics to make the input current more sinusoidal. Although these converters
implemented with such PFC are simple and inexpensive, they are also heavy and bulky, and thus,
passive methods are used in a limited number of applications.
2) Two-stage converters that use a pre-regulator to make the input current sinusoidal and
to control the intermediate dc bus voltage along with a dc–dc converter to produce the desired
output voltage. Such converters, however, require two separate switch-mode converters so that
the cost, size, and complexity of the overall ac–dc converter are increased.
3) Single-stage power-factor-corrected (SSPFC) converters that have PFC and isolated
dc–dc conversion in a single power converter so that they are simpler and cheaper than two-stage
converters. Several single-phase and three-phase converters have been proposed in the literature,
with three-phase converters being preferred over single-phase converters for higher power
applications
A three-phase, single-stage three-level converter proposed in mitigates these drawbacks.
Although the converter proposed in that paper was an advance over previously proposed three-
phase single-stage converters, it still suffered from the need to have a discontinuous output
inductor current at lightload conditions to keep the dc bus capacitor voltage l ess than 450 V, and
it needed to operate with discontinuous input current, which resulted in high component current
stress and the need for significant input filtering due to the large amount of ripple.

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The topology proposed in which is an interleaved three-phase single-stage converter that
has an interleaved structure; this structure is a very popular structure in power electrons
converters .
The topology also has an output current that is continuous for almost all load ranges, a dc
bus voltage that is less than 450 for all load conditions, and a superior input current harmonic
content.
In this paper, a new interleaved three-phase single-stage PFC ac–dc converter that uses
flying capacitor structure with standard phase-shift pulse width modulation (PWM) is presented
to improve efficiency of the converter particularly at light-load conditions.
The operation of the converter is explained, the steadystate characteristics of the new
converter are determined, and its design is discussed.

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EXISTING SYSTEM:
Traditional passive diode rectifier/LC filter input combination; the resulting converter
would be very bulky and heavy due to the size of the low-frequency inductors and capacitors.
The most common approach to PFC is to use two-stage power conversion schemes. These two-
stage schemes use a front-end ac–dc converter stage to perform ac–dc conversion with PFC with
the output of the front-end converter fed to a back-end dc–dc converter stage that produces the
desired isolated dc output voltage. Using two converter stages in this manner, however, increases
the cost, size, and complexity of the overall ac–dc converter, and this has led to the emergence of
single-stage power-factor-corrected converters. In order to reduce the cost, size, and complexity
associated with two-stage ac–dc power conversion and PFC, researchers have tried to propose
single-stage converters that integrate the functions of PFC and isolated dc–dc conversion in a
single power converter.

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PROPOSED SYSTEM:
The proposed converter can operate with reduced input current ripple and peak switch
currents due to its interleaved structure, a continuous output inductor current due to its three-
level structure, and improved light-load efficiency as some of its switches can be turned ON
softly. In the paper, the operation of the converter is explained, the steady-state characteristics of
the new converter are determined.

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ADVANTAGES:
 Better efficiency, especially under light-load

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BLOCK DIAGRAM:

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TOOLS AND SOFTWARE USED:
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation

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APPLICATIONS:
 LED lighting applications
 DC drives

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CONCLUSION:
Anewinterleaved three-phase, three-level, SSPFC ac–dc converter using standard phase-
shift PWMwas presented in this paper. In this paper, the operation of the converter was
explained, and its feasibility was confirmed with experimental results obtained from a prototype
converter. The efficiency of the new converter was compared to that of another converter of the
same type. It was shown that the proposed converter has a better efficiency, especially under
light-load conditions, and it was explained that this is because energy from the output inductor
can always be used to ensure that the very top and the very bottom switches can be turned ON
with ZVS, due to a discharge path that is introduced by its flying capacitor.

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REFERENCES:
[1] Limits for Harmonic Current Emission (Equipment Input Current>16A per Phase), IEC1000-
3-2, 1995.
[2] J. M. Kwon, W. Y. Choi, and B. H. Kwon, “Single-stage quasi-resonant flyback converter for
a cost-effective PDP sustain power module,” IEEE Trans. Ind. Electron., vol. 58, no. 6, pp.
2372–2377, Jun. 2011.
[3] H. S. Ribeiro and B. V. Borges, “New optimized full-bridge single-stage ac/dc converters,”
IEEE Trans. Ind. Electron., vol. 58, no. 6, pp. 2397– 2409, Jun. 2011.
[4] N. Golbon and G. Moschopoulos, “A low-power ac-dc single-stage converter with reduced
dc bus voltage variation,” IEEE Trans. Power Electron., vol. 27, no. 8, pp. 3714–3724, Jan.
2012.
[5] H. M. Suraywanshi, M. R. Ramteke, K. L. Thakre, and V. B. Borghate, “Unity-power-factor
operation of three phase ac-dc soft switched converter based on boost active clamp topology in
modular approaches

A new interleaved three phase single-stage pfcac–dc converter with flying capacitor

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A new interleaved three phase single-stage pfcac–dc converter with flying capacitor