Parformance — Based comparision of UPQC compensating signal generation algorithms under disstorted supply and non linear load conditions

Abstract

The recent growth in the use of power electronic converters which are considered as nonlinear loads have problems of drawing non sinusoidal current and reactive power from source which in turn pollutes the power quality. This paper presents the power quality problems and methods for its correction. Two control strategies (p i q instantaneous power theory and d i q synchronous reference frame theory) have been used to extract reference currents for active power filters (APF), to solve power quality problems, have been evaluated and their performances are compared under distorted supply and nonlinear load conditions. These theories are used to implement the control algorithm of a Unified Power Quality Conditioner (UPQC) which compensates the harmonic current, harmonic voltage and load unbalance. This paper implements the three phase shunt and series active power filters to compensate current and voltage harmonics. The evaluation of UPQC performance is validated using MATLAB/Simulink showing the comparisons for above two algorithms, and is proved as the efficient way to address power quality issues.