Open AccessControl algorithms based on the active and non‐active currents for a UPQC without series transformers
Author(s) -
Correa Monteiro Luis Fernando,
Aredes Mauricio,
Pinto Jose Gabriel,
Exposto Bruno Fernandes,
Afonso Joao Luiz
Publication year - 2016
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.2015.0642
Subject(s) - transformer , voltage , ac power , electronic engineering , control theory (sociology) , engineering , transient (computer programming) , algorithm , harmonic , digital signal processing , computer science , electrical engineering , control (management) , artificial intelligence , physics , quantum mechanics , operating system
This study presents control algorithms for a new unified power quality conditioner (UPQC) without the series transformers that are frequently used to make the insertion of the series converter of the UPQC between the power supply and the load. The behaviour of the proposed UPQC is evaluated in presence of voltage imbalances, as well as under non‐sinusoidal voltage‐and current conditions. The presented algorithms derive from the concepts involving the active and non‐active currents, together with a phase‐locked‐loop circuit. Based on these real‐time algorithms, and considering the proposed hardware topology, the UPQC is able to compensate the harmonic components of the voltages and currents, correct the power factor, and keep the load voltages regulated, all of this in a dynamic way, responding instantaneously to changes in the loads or in the electrical power system. The control algorithms were distributed in a two‐DSP digital control architecture, without any communication between them. Consequently, can be increased the sampling frequency of the acquired voltages and currents and improve the UPQC performance. Furthermore, some constraints of the proposed UPQC are evidenced, particularly when the main voltages are imbalanced. Simulation and experimental results are presented to verify the UPQC performance under transient and steady state conditions.