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Power electronic devices are non-linear loads that create harmonic
distortion and can be susceptible to voltage dips if not adequately
protected. The most common economically damaging power quality
problem encountered involves the use of variable-speed drives.
THREE-PHASE ac-dc conversion of electric power is widely employed
in adjustable-speeds drive (ASDs)), uninterruptible power supplies
(UPSs), HVDC systems, and utility interfaces with non conventional
energy sources such as solar photovoltaic systems (PVs),
etc.Traditionally, ac-dc converters, which are also known as
rectifiers, are developed using diodes and thyristors to provide
uncontrolled and controlled unidirectional and bidirectional dc
power. They have the problems of poor power quality. This book is
an endeavour towards analyzing the different multi-pulse converters
in solving the power quality problem in a three-phase converter
system.
Isolated power systems are commonly found in rural and remote areas
of the world. These systems represent the alternative to grid
connection, where interconnection to a large grid is not viable due
to high cost and/or geographical obstacles. Furthermore, power
systems such as those onboard of ships, in oil exploration areas
and remote mining districts are characterized by limited generating
capacity, supplying loads which can consist of significant amount
of motor drives and power converters. The use of series
compensators (SCs) in improving voltage quality of isolated power
systems is to be considered.A control strategy for the SC is to be
developed to regulate power flow. This is achieved through phase
adjustment of load terminal voltage.Through a phase adjustment
technique, we can show that the voltage quality across the
terminals of the protected load can be controlled.
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