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EXTENDED BOOST ACTIVE-SWITCHED-CAPACITOR/ SWITCHED-INDUCTOR
QUASI-Z-SOURCE INVERTERS
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 “EXTENDED BOOST ACTIVE-SWITCHEDCAPACITOR/ SWITCHED-INDUCTOR QUASI-Z-SOURCE INVERTERS” 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 “EXTENDED BOOST ACTIVE-SWITCHEDCAPACITOR/ SWITCHED-INDUCTOR QUASI-Z-SOURCE INVERTERS” 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 “EXTENDED BOOST ACTIVE-SWITCHEDCAPACITOR/ SWITCHED-INDUCTOR QUASI-Z-SOURCE INVERTERS” 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:
This paper proposes a new topology named the active-switched-capacitor/switchedinductor quasi-Z-source inverter (ASC/SL-qZSI), which is based on a traditional qZSI topology.
Compared to other qZSI-based topologies under the same operating conditions, the proposed
ASC/SL-qZSI provides higher boost ability, requires fewer passive components such as
inductors and capacitors, and achieves lower voltage stress across the switching devices of
themain inverter. Another advantage of the topology is its expandability. If a higher boosting rate
is required, additional cells can easily be cascaded at the impedance network by adding one
inductor and three diodes. Both the simulation studies and the experimental results obtained from
a prototype built in the laboratory validate proper operation and performance of the proposed
ASC/SL-qZSI.
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INTRODUCTION:
In a traditional pulse width modulation (PWM) inverter, the obtainable ac output voltage
is limited to be less than the dc input voltage, and so, an additional dc–dc boost converter is
required to obtain the desired ac output voltage. In order to overcome the limitations of a
traditional inverter, a Z-source inverter (ZSI), in which the traditional dc link is replaced with the
Z-source network, is introduced.
The ZSI can boost the dc voltage by using the shoot-through state of the inverter bridge.
Thus, buck–boost capability is achieved with a single power conversion stage, which reduces
component count and improves the reliability. Some studies in ZSI have progressed with
modeling techniques, control methods, and modulation strategies. The ZSI has been applied to
electric vehicles and photovoltaic (PV) power generation systems due to its wide range of
obtainable voltage.
Recently, some advanced dc–dc conversion techniques combined with the qZSI/ZSI have
been proposed in order to increase the boosting ability. Both the C-switching structure with two
capacitors and two-three diodes, and the L-switching structurewith two inductors and two-three
diodes were proposed Four converter topologies categorized as continuous- or discontinuouscurrent diode-assisted boost, and continuous- or discontinuous-current capacitor-assisted boost
were proposed several types of switched-inductor impedance networks coupled to a ZSI or qZSI
were introduced.
To enhance the boosting ability, additional cells are cascaded at the generalized switchedinductor and switched-capacitor ZSI or nonisolated dc–dc converter. They provide a high boost
capacity and a simple structure in transformerless and cascaded structures.
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However, additional inductors and capacitors at the impedance network are required for
further raising the boost factor, and they increase the cost and size of the power converter.
Voltage-fed or current-fed switched inverter topologies for reducing the number of passive
components in the impedance network have been proposed. However, the boost factors of both
switched inverters are no higher than with traditional ZSI.
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EXISTING SYSTEM:
The Quasi-Z-Source inverter circuit differs from that of conventional Z Source Inverter in
LC impedance network interface between the source and inverter. A PV cell’s voltage varies
widely with temperature and irradiation, but the traditional voltage Source Inverter (VSI) cannot
deal with this wide range without overrating of the inverter, because the VSI is a buck converter
whose input dc voltage must be greater than the peak ac output voltage. Because of this, a
transformer and/or a dc/dc converter is usually used in PV applications, in order to cope with the
range of the PV voltage , reduce inverter ratings, and produce a desired voltage for the load or
connection to the utility. This leads to a higher component count and low efficiency, which
opposes the goal of cost reduction. The Z-Source Inverter (ZSI) has been reported suitable for
residential PV system because of the capability of voltage boost and inversion in a single stage.
Recently, four new topologies, the quasi-Z-Source Inverter (qZSI), have been derived from the
original ZSI
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PROPOSED SYSTEM:
In this paper, a new topology named an active-switched-capacitor/switched-inductor
qZSI (ASC/SL-qZSI) based on traditional qZSI topology is proposed. The proposed ASC/SLqZSI offers a low number of passive components such as capacitors and inductors in the
impedance network, high boost ability, and low voltage stress across the switching devices.
Additionally, it can be extended to have a very high boost capability by cascading additional
cells.
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ADVANTAGES:

Expandability.

The cost, size, and weight of the power converter can be reduced
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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:

PV or fuel-cell generation systems.
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CONCLUSION:
This paper proposed a new ASC/SL-qZSIs based on the qZSI
topology. In comparison to other topologies such as CA-qZSI,
DA-qZSI, and SL-qZSI, the proposed ASC/SL-qZSI provides a
higher boost factor over the whole range of shoot-through duty
ratio. Passive components, such as one inductor and one-three
capacitors in the impedance network, are reduced in number,
although one more switching device is needed. The summarized
value of inductances required at the proposed ASC/SL-qZSI is
slightly higher than those of both the CA-qZSI and SL-qZSI,
and the capacitance value for the proposed topology is much
lower than the summarized value of capacitances required at the
other three topologies.
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REFERENCES:
[1] F. Z. Peng, “Z-source inverter,” IEEE Trans. Ind. Appl., vol. 39, no. 2, pp. 504–510, Mar.
2003.
[2] J. B. Liu, J. G. Hu, and L. Y. Xu, “Dynamic modeling and analysis of Zsource converterderivation of ac small signal model and design-oriented analysis,” IEEE Trans. Power Electron.,
vol. 22, no. 5, pp. 1786–1796, Sep. 2007.
[3] Y. Tang, S. J. Xie, C. H. Zhang, and Z. G. Xu, “Improved Zsource inverter with reduced
capacitor voltage stress and soft-start capability,” IEEE Trans. Power Electron., vol. 24, no. 2,
pp. 409–415, Feb. 2009.
[4] Q. V. Tran, T. W. Chun, J. Y. Ahn, and H. H. Lee, “Algorithms for controlling both the dc
boost and ac output voltage of Z-source inverter,”
[5] B. Mirafzal, M. Saghaleini, and A. K. Kaviani, “An SVPWM-based switching pattern for
stand-alone and grid-connected three-phase singlestage boost inverters,” IEEE Trans. Power
Electron., vol. 26, no. 4, pp. 1102–1111, Apr. 2011.
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