Open AccessPower quality improvement using a dual unified power quality conditioner/uninterruptible power supply in three‐phase four‐wire systems
Author(s) -
Modesto Rodrigo Augusto,
Oliveira da Silva Sérgio Augusto,
Júnior Azauri Albano
Publication year - 2015
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2014.0734
Subject(s) - uninterruptible power supply , converters , compensation (psychology) , power (physics) , electronic engineering , computer science , dual (grammatical number) , voltage , three phase , voltage source , control theory (sociology) , pulse width modulation , engineering , electrical engineering , control (management) , psychology , art , physics , literature , quantum mechanics , artificial intelligence , psychoanalysis
Using a dual compensation strategy, this study proposes the analysis and implementation of active power quality conditioners (PQCs), which are applied for power quality improvement in three‐phase four‐wire (3P4W) systems. By means of similar control strategy use, the topology employed to implement the PQCs can operate as unified PQC (UPQC), or, through some circuit modifications, as uninterruptible power supply (UPS) system. Considering 3P4W systems, the use of the dual compensation strategy into the PQCs comprised of two four‐leg (4‐Leg) converters is the main contribution of this study. Different from the conventional strategies, in the dual compensation strategy, the 4‐Leg converter connected in parallel with the load is controlled to operate as a sinusoidal voltage source, whereas the 4‐Leg converter connected in series between the grid and the load is controlled to operate as a sinusoidal current source. Both the voltage and current controllers are implemented into the synchronous rotating reference frame, and the converters use the three‐dimensional space vector modulation technique. Experimental tests, based on a digital signal processor, are performed in order to validate the theoretical development and to verify both static and dynamic performance of the PQC operating as UPQC, as well as UPS system.