FACTOR CORRECTION CONVERTERS FOR DISTRIBUTED POWER SYSTEM by MATADA MAHESH

FACTOR CORRECTION CONVERTERS FOR
DISTRIBUTED POWER SYSTEM

MATADA MAHESH
Dissertation submitted in partial fulfillment of the requirements for the
degree ofDoctor of Philosophy In Electrical Engineering
Under the supervision of
Prof. Anup Kumar Panda
Department of Electrical Engineering
National Institute of Technology, Rourkela
October 2011
ABSTRACT
In present situation, the increase in the utilization of computers, laptops,
uninterruptable power supplies, telecom and bio-medical equipments has become
uncontrollable as its growth is rising exponentially. Hence, increase in functionality of such
equipments leads to the higher power consumption and low power density which provided a
large market to distributed power systems (DPS). The development of these DPS posed
challenges to power engineers for an efficient power 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 converters employed in DPS, with the primary
aim of achieving nearly unity power factor operation of converters.
Single-phase and three-phase rectifiers are increasingly used in the field of alternating
current – direct current (AC-DC) power converters as front-end converters in DPS. For
power factor correction (PFC) stage, conventional single-phase AC-DC PFC boost converter
is the most suitable topology because of its inherent advantages. These PFC boost converters
exhibit poor dynamic regulation of output voltage owing to low pass filter in the voltage
feedback loop. Research effort has been made to mitigate this problem of AC-DC PFC boost
converters. An extended pulse width modulation switching 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 during transient periods.
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