Ultrasparse ac link converters

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IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT
ULTRASPARSE AC-LINK CONVERTERS
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 “ULTRASPARSE AC-LINK CONVERTERS ” 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 “ULTRASPARSE AC-LINK CONVERTERS”
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:

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ACKNOWLEDGEMENT
I am extremely glad to present my project “ULTRASPARSE AC-LINK CONVERTERS”
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:
Soft-switching ac-link universal power converters, also called partial resonant converters
and ac-link buck–boost converters, have received noticeable attention during the last few years.
In these converters, each of the inputs and outputs can be dc, single-phase ac, or multiphase ac;
therefore, they can be used for dc–dc, dc–ac, ac–dc, or ac–ac power conversion systems. The
soft-switching ac-link universal power converters are compact, reliable, and expected to offer
longer lifetime compared with the other types of converters. However, they require more
switches, which make the control process more involved. The sparse ac-link buck–boost
converters were proposed to partially solve this problem. The sparse configuration reduces the
number of switches from 24 to 20 in a three-phase ac–ac configuration. This paperproposes a
modified configuration, which further reduces the number of switches without changing the
principles of operation. This converter, which is named ultrasparse ac-link buck–boost converter,
reduces the number of switches from 24 to 16, in a three-phase ac-to-ac case, and from 20 to 10,
in a dc-to-threephase- ac configuration. The proposed converter is applicable to systems with
unidirectional flow of power, such as PV and wind power generation systems.

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INTRODUCTION:
Soft-switching ac-link universal power converter, also called partial resonant ac-link
converter and ac-link buck–boost converter, was introduced. Different applications of this
converter have been studied.
This converter has several advantages over the other types of converters. Being
universal, the input and output of this converter may be dc, ac, single-phase, or multiphase. This
converter is an extension of the dc–dc buck–boost converter. Therefore, unlike matrix
converters, it is capable of both stepping up and stepping down the voltage. It can also change
the frequency over a wide range.
By adding the complementary switches and by modifying the switching scheme, the link
inductor, which is the main energy storage element in this converter, can have ac instead of the
dc. This approach improves the performance of the converter and significantly increases the
utilization of the link inductor.
In this converter, the frequency of the link current and voltage is only limited by the
characteristics of the switches and the sampling time of the microcontroller. Therefore, the
frequency can be very high, which results in compact link and filter components. By placing a
small capacitor in parallel with the link inductor, the converter benefits from soft switching.

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EXISTING SYSTEM:
A schematic of the topology, in which the link is formed by a low reactive rating inductor
capacitor pair. All power transfer goes through the link inductor in a completely indirect means.
Each leg of the converter is made of 2 bidirectional switches, realized by anti-series
IGBT/diodes. As shown in this figure, six bidirectional switches interface a link inductor to the
output, while another 6 bi-directional switches interface the same link inductor to the input. The
converter transfers power entirely through the link inductor. Charging and discharging take place
alternately. The frequency of charge/discharge is called the link frequency and is typically much
higher than the input/output line frequency. The resulting input and output current pulses have to
be precisely modulated such that when filtered, they achieve unity power factor at the input
while meeting the output references. Normally, the instantaneous values of the input current
commands are in phase or are phase adjusted with respect to the input voltages so as to achieve
unity power factor

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PROPOSED SYSTEM:
Despite using unidirectional switches, the sparse ac-link buck–boost converter can
support bidirectional power flow. However, there are several applications that do not require
bidirectional flow of power. For these applications, the ultrasparse ac-link buck–boost converter
is proposed in this paper. This converter requires fewer switches than the sparse ac-link buck–
boost converter. Therefore, it is more reliable, more compact, less expensive, and less
complicated compared to the sparse and the conventional ac-link buck–boost converters.

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ADVANTAGES:
 Reduces conduction losses.
 Reduced number of switches.
 Zero-voltage turn on of the switches, soft turn off of the switches, alternating link current,
short resonating modes,

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BLOCK DIAGRAM:
INTERMEDIATECROSS OVER
SWITCHING CIRCUIT
INPUT AC
SUPPLY
BRIDGE
RECTIFIER
OUTPUT SIDE
BRIDGE
CONVERTER
FILTER
LOAD
FULL
BRIDGE
INVERTER
RESONANT
CIRCUIT
RECTIFIER
DRIVER CIRCUIT
PIC CONTROLLER WITH
BUFFER
5V DC
12V
DC

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

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APPLICATIONS:
 AC drives applications
 Wind energy applications

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CONCLUSION:
This paper has proposed a novel soft-switching ac-link universal power converter. The
proposed converter, named ultrasparse ac-link buck–boost converter, is a modification of the ac-
link buck–boost converter. In this converter, the number of switches is reduced from 24 in the
original ac–ac configuration to 16. This converter may be used in applications with
unidirectional flow of power, where the phase shift between the fundamental component of the
unfiltered load current and the voltage is less than 30◦ (displacement power factor higher than
0.87). Despite reducing the number of switches, the proposed converter has all the advantages of
the original converter, including zero-voltage turn on of the switches, soft turn off of the
switches, alternating link current, short resonating modes, and the possibility of having galvanic
isolation with the addition of a single-phase high-frequency transformer

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REFERENCES:
[1] W. C. Alexander, “Universal power converter,” U.S. Patent 2008/ 001 335 1A1, Jan. 17,
2008.
[2] M. Amirabadi, H. A. Toliyat, and W. C. Alexander, “Partial resonant AClink converter: A
highly reliable variable frequency drive,” in Proc. IEEE IECON, 2012, pp. 1946–1951.
[3] M. Amirabadi, A. Balakrishnan, H. A. Toliyat, and W. C. Alexander, “High frequencyAC-
link PVinverter,” IEEE Trans. Ind. Electron., vol. 61, no. 1, pp. 281–291, Jan. 2014.
[4] M. Amirabadi, H. A. Toliyat, andW. C. Alexander, “A multi-port AC-link PV inverter with
reduced size and weight for stand-alone application,” IEEE Trans. Ind. Appl., vol. 49, no. 5, pp.
2217–2228, Sep./Oct. 2013.
[5] M. Amirabadi, “Soft-switching high-frequency ac-link universal power converters with
galvanic isolation,” Ph.D. dissertation, Elect. Comput. Eng. Dept., Texas A&M Univ., College
Station, TX, USA, 2013

Ultrasparse ac link converters

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