Performance Improvement of AC-DC Power Factor Correction Converters For Distributed Power System

By: Matada , MaheshContributor(s): Panda, Anup Kumar [Supervisor] | Department of Elecrical EngineeringMaterial type: TextTextLanguage: English Publisher: 2011Description: 203 pSubject(s): Engineering and Technology | Electrical Engineering | Power TransformersOnline resources: Click here to access online Dissertation note: Thesis (Ph.D)- National Institute of Technology, Rourkela Summary: In present situation, the increase in the utilizati on of computers, laptops, uninterruptable power supplies, telecom and bio-med ical equipments has become uncontrollable as its growth is rising exponentiall y. Hence, increase in functionality of such equipments leads to the higher power consumption an d low power density which provided a large market to distributed power systems (DPS). Th e development of these DPS posed challenges to power engineers for an efficient powe r delivery with stringent regulating standards; this is the motivation and driving force of this research work. The objective is to minimize the switching losses of front-end converte rs employed in DPS, with the primary aim of achieving nearly unity power factor operatio n of converters. Single-phase and three-phase rectifiers are increas ingly used in the field of alternating current – direct current (AC-DC) power converters a s front-end converters in DPS. For power factor correction (PFC) stage, conventional s ingle-phase AC-DC PFC boost converter is the most suitable topology because of its inhere nt advantages. These PFC boost converters exhibit poor dynamic regulation of output voltage o wing to low pass filter in the voltage feedback loop. Research effort has been made to mi tigate this problem of AC-DC PFC boost converters. An extended pulse width modulation swi tching technique has been investigated and proposed especially for single-phase and three- phase AC-DC PFC boost converters to improve the dynamic response of output voltage duri ng transient periods. Current trends demand the miniaturization of front- end converters in DPS. One of the several methods to achieve the same is operation of PFC converter at higher switching frequency; this in turn increases the switching los ses of a PFC converter. Suitable soft switching techniques are generally employed to mini mize these switching losses. Also these techniques alleviate the semiconductor switches of PFC converters from extra voltage and/or current stresses. In this research work, two types of zero voltage transition (ZVT) techniques x in PFC boost converters for medium as well as for h igh power converters are proposed: (1) Boost converter with passive auxiliary circuit and (2) Boost converter with active auxiliary circuit. These PFC converters are designed to oper ate for 400 V, 100 kHz, 500 W and/or 1500 W specifications. The operation principles an d a detailed steady-state analysis of each ZVT based AC-DC PFC boost converters are described and presented. The proposed converters are more reliable and achieve high effic iency with low total harmonic distortion. Besides improving circuit topology and efficiency, effort is made to achieve power expandability and higher power density for the fron t-end converters in DPS by modular approach. In addition, this approach also provides higher reliability, easier thermal management, and maintainability. The proposed converters presented in this research work are well defined by their mathematical modeling and its modes of operations. The prototypes of all the proposed converters are developed in the Power Electronics a nd Drives laboratory, National Institute of Technology, Rourkela. Their feasibility are verifi ed and confirmed by simulation and experimental results.
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Thesis (Ph.D/M.Tech R) Thesis (Ph.D/M.Tech R) BP Central Library
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Thesis (Ph.D)- National Institute of Technology, Rourkela

In present situation, the increase in the utilizati
on of computers, laptops,
uninterruptable power supplies, telecom and bio-med
ical equipments has become
uncontrollable as its growth is rising exponentiall
y. Hence, increase in functionality of such
equipments leads to the higher power consumption an
d low power density which provided a
large market to distributed power systems (DPS). Th
e development of these DPS posed
challenges to power engineers for an efficient powe
r delivery with stringent regulating
standards; this is the motivation and driving force
of this research work. The objective is to
minimize the switching losses of front-end converte
rs employed in DPS, with the primary
aim of achieving nearly unity power factor operatio
n of converters.
Single-phase and three-phase rectifiers are increas
ingly used in the field of alternating
current – direct current (AC-DC) power converters a
s front-end converters in DPS. For
power factor correction (PFC) stage, conventional s
ingle-phase AC-DC PFC boost converter
is the most suitable topology because of its inhere
nt advantages. These PFC boost converters
exhibit poor dynamic regulation of output voltage o
wing to low pass filter in the voltage
feedback loop. Research effort has been made to mi
tigate this problem of AC-DC PFC boost
converters. An extended pulse width modulation swi
tching technique has been investigated
and proposed especially for single-phase and three-
phase AC-DC PFC boost converters to
improve the dynamic response of output voltage duri
ng transient periods.
Current trends demand the miniaturization of front-
end converters in DPS. One of the
several methods to achieve the same is operation of
PFC converter at higher switching
frequency; this in turn increases the switching los
ses of a PFC converter. Suitable soft
switching techniques are generally employed to mini
mize these switching losses. Also these
techniques alleviate the semiconductor switches of
PFC converters from extra voltage and/or
current stresses. In this research work, two types
of zero voltage transition (ZVT) techniques
x
in PFC boost converters for medium as well as for h
igh power converters are proposed: (1)
Boost converter with passive auxiliary circuit and
(2) Boost converter with active auxiliary
circuit. These PFC converters are designed to oper
ate for 400 V, 100 kHz, 500 W and/or
1500 W specifications. The operation principles an
d a detailed steady-state analysis of each
ZVT based AC-DC PFC boost converters are described
and presented. The proposed
converters are more reliable and achieve high effic
iency with low total harmonic distortion.
Besides improving circuit topology and efficiency,
effort is made to achieve power
expandability and higher power density for the fron
t-end converters in DPS by modular
approach. In addition, this approach also provides
higher reliability, easier thermal
management, and maintainability.
The proposed converters presented in this research
work are well defined by their
mathematical modeling and its modes of operations.
The prototypes of all the proposed
converters are developed in the Power Electronics a
nd Drives laboratory, National Institute of
Technology, Rourkela. Their feasibility are verifi
ed and confirmed by simulation and
experimental results.

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