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TitleControl algorithms based on the active and non-active currents for a UPQC without series transformers
Author(s)Correa Monteiro, Luis Fernando
Aredes, Mauricio
Pinto, J. G.
Exposto, Bruno
Afonso, João L.
Keywordselectric current control
power supply quality
power convertors
phase locked loops
power system harmonics
power factor correction
load regulation
voltage control
power system control
digital control
digital signal processing chips
nonactive current
active current
series transformer
unified power quality conditioner
series converter
power supply
voltage imbalance
nonsinusoidal voltage-and current condition
phase-locked-loop circuit
harmonic component compensation
power factor correction
load voltage regulation
electrical power system
DSP digital control architecture
Issue date27-Jul-2016
PublisherInstitution Engineering Technology (IET)
JournalIET Power Electronics
Abstract(s)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.
AccessOpen access
Appears in Collections:CAlg - Artigos em revistas internacionais / Papers in international journals

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