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This paper presents a new synchronous-reference-frame (SRF)-based control method to compensate power-quality (PQ) problems through a three-phase four-wire unified PQ conditioner (UPQC) under unbalanced and distorted load conditions. The proposed UPQC system can improve the power quality at the point of common coupling on power distribution systems under unbalanced and distorted load conditions. The simulation results based on Matlab/Simulink are discussed in detail to support the SRF-based control method presented in this paper. The proposed approach is also validated through experimental study with the UPQC hardware prototype. [ABSTRACT FROM AUTHOR]

This paper presents design and implementation of a new type of grid-based harmonic voltage source (HVS) that can be used in general power quality experimental studies and experimental active power filter applications in order to create voltage source harmonics and power quality problems. Their experimental results and feasibility of the proposed system were explained in detail. The proposed system has been tested in real time low voltage level in a 5 kW laboratory prototype. The proposed method has very easy mathematical calculations in order to create different types of voltage source based power quality problems (harmonics, unbalances, and voltage sag and swell etc.). [ABSTRACT FROM AUTHOR]

This paper presents a new control method to compensate source voltage and load current harmonics and improvement of power quality problems through a three-phase unified power quality conditioner (UPQC). The UPQC system consists of combined operation of series and shunt active power filters sharing a common DC link. Paralel Active Power Filter (PAF) used for current harmonics, unbalanced and neutral current compensation; Series Active Power Filter (SAF) used for compensation of source voltage harmonics, unbalanced voltage and sag and swell of source voltage. The performance of the proposed control system was analyzed using simulations with Matlab/Simulink program, and experimental results with the hardware prototype. The proposed UPQC control algorithm can improve the power quality at the point of common coupling (PCC) on power distribution system. [ABSTRACT FROM AUTHOR]