Paper Title
Improvement Of Power Quality By Using Unified Power Quality Conditioner
Abstract
The term power quality is most important
aspect in any power delivery system. The main
causes of poor power quality are supply voltage
variations i.e. voltage sag/swell, harmonics in load
current and poor power factor. In order to deal with
this problem, UPQC is the most effective power
device preferred to address the power quality
problems. This paper deals with Unified Power
Quality Conditioner (UPQC) which is the
combination of series and shunt active power filter to
compensate simultaneously load current harmonics,
supply voltage fluctuations and to improve power
factor. In other words, the UPQC has the capability of
improving power quality at the point of common
coupling in power distribution system. This paper
presents, a simplified synchronous reference frame
(SRF) or d-q theory based control method applied to
series active filter and instantaneous reactive power
or p-q theory based control techniques applied to
shunt active filter to compensate power quality (PQ)
problems by using UPQC. The performance of UPQC
is evaluated by using MATLAB/SIMULINK
software.
Index Terms-Active power filter (APF), harmonics,
power quality (PQ), synchronous reference frame
(SRF), unified power quality conditioner (UPQC).