QSE - Qualitat del Subministrament Elèctric
El grup de recerca estudia la qualitat en el subministrament elèctric, és a dir, les desviacions de la tensió i/o el corrent de la seva situació ideal amb forma d'ona sinusoïdal de magnitud i freqüència concretes. Bàsicament, s'estudien tres tipus de pertorbacions en la qualitat de subministrament elèctric: la distorsió harmònica, els sots de tensió, i els desequilibris trifàsics. El grup també ha desenvolupat una valuosa tasca, amb reconeixement de la comunitat científica, en l'estimació dels paràmetres de les màquines elèctriques.
Així mateix, el grup està treballant en l'actualitat en:
(1) l'estabilitat i la protecció de xarxes de MT amb generació distribuïda,
(2) xarxes en corrent continu (HVDC y MVDC),
(3) l'efecte de la integració de les energies renovables en l'estabilitat de la xarxa i en el seu sistema de proteccions.
The group studies power quality, i.e. the deviations of voltage and/or current from the ideal situation of a sine wave that is constant in magnitude and frequency. Basically, three types of power quality disturbances are studied: harmonic distortion, voltage sags and three-phase unbalance. Harmonic distortion is produced when voltage and current waveforms are non-sinusoidal but periodic, due to the presence of nonlinear loads in electrical power systems. Voltage sags are short-duration reductions in rms voltage caused by short-circuits in the system. Three-phase unbalance is produced when the three-phase voltages and currents are not symmetrical and/or balanced due to the presence of unbalanced loads in electrical power systems.
The group studies power quality, i.e. the deviations of voltage and/or current from the ideal situation of a sine wave that is constant in magnitude and frequency. Basically, three types of power quality disturbances are studied: harmonic distortion, voltage sags and three-phase unbalance. Harmonic distortion is produced when voltage and current waveforms are non-sinusoidal but periodic, due to the presence of nonlinear loads in electrical power systems. Voltage sags are short-duration reductions in rms voltage caused by short-circuits in the system. Three-phase unbalance is produced when the three-phase voltages and currents are not symmetrical and/or balanced due to the presence of unbalanced loads in electrical power systems.
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Articles de revista [78]
Recent Submissions
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An appropriate index to assess the global cancellation level of the harmonic currents consumed by a set of single-phase uncontrolled rectifiers and a set of fluorescent lamps
(2022-06-13)
Article
Open AccessAn in-depth study of harmonic current reduction in European commercial buildings due to the harmonic cancellation effect when a set of single-phase uncontrolled rectifiers and a set of fluorescent lamps are connected at ... -
Artificial intelligence-based protection for smart grids
(2022-07-05)
Article
Open AccessLately, adequate protection strategies need to be developed when Microgrids (MGs) are connected to smart grids to prevent undesirable tripping. Conventional relay settings need to be adapted to changes in Distributed ... -
Methodology for obtaining simplified models for the long-term energy management of renewable assets under a high degree of uncertainty
(Elsevier, 2022-11)
Article
Open AccessThis paper addresses the attainment of a methodology aimed at obtaining simplified models embedding the regulatory constraints imposed by the country-specific remuneration mechanisms in the energy management system of long ... -
State-space model of qZSI based PMSG-WPGSs for transient dynamic studies
(2021-09)
Conference lecture
Restricted access - publisher's policyThe use of permanent magnet synchronous generators (PMSGs) with full-scale back-to-back converters is rising as a common option in wind power generation systems (WPGSs). An efficient grid integration of PMSG-WPGSs is ... -
New methodology to calculate DC voltage signature in n-phases TRUs under supply voltage sags
(Institute of Electrical and Electronics Engineers (IEEE), 2022-02-28)
Article
Open AccessA new methodology based on the shadow projection has been developed to study any multipulse rectifier's dynamic behavior under balanced and unbalanced conditions. The proposed methodology calculates the DC average voltage ... -
Three-port small signal admittance-based model of VSCs for studies of multi-Terminal HVDC hybrid AC/DC yransmission grids
(2021-01-01)
Article
Open AccessMulti-terminal high voltage direct current (HVDC) systems, together with AC transmission systems and voltage source converters (VSCs), form hybrid AC/DC grids with complex dynamic and transient interactions. VSCs ... -
Integration of Distributed Energy Resources to Unbalanced Grids under Voltage Sags with Grid Code Compliance
(2022-01-01)
Article
Restricted access - publisher's policyThe aim of this paper is to analyze the situations in which distributed power generation systems (DPGSs) based on renewable energy sources (RESs) can be controlled when operating under voltage sags. Analytical models for ... -
Frequency domain stability assessment of photovoltaic power generation systems with quasi-z-source inverters
(2021-09-01)
Article
Open AccessPhotovoltaic power generation systems are one of the main renewable power sources, and quasi-Z-source inverters are becoming powerful devices to integrate these systems in AC grids. However, stability issues due to the ... -
Stability assessment for multi-infeed grid-connected VSCs modeled in the admittance matrix form
(2021-09-01)
Article
Open AccessThe increasing use of power electronics converters to integrate renewable energy sources has been a subject of concern due to the resonance oscillatory phenomena caused by their interaction with poorly damped AC networks. ... -
State-space model of quasi-z-source inverter-PV systems for transient dynamics studies and network stability assessment
(2021-07-09)
Article
Open AccessPhotovoltaic (PV) power systems are increasingly being used as renewable power generation sources. Quasi-Z-source inverters (qZSI) are a recent, high-potential technology that can be used to integrate PV power systems into ... -
Quasi-z-source inverter-based photovoltaic power system modeling for grid stability studies
(2021-01-19)
Article
Open AccessQuasi-Z-source inverters (qZSIs) are becoming a powerful power conversion technology in photovoltaic (PV) power systems because they allow energy power conversion in a single stage operation. However, they can cause system ... -
Average value of the DC-link output voltage in multi-phase uncontrolled bridge rectifiers under supply voltage balance and unbalance conditions
(2021-12-01)
Article
Open AccessAverage value of the DC-link output voltage is a variable of interest in multi-phase uncontrolled bridge rectifiers. The aim of this paper is to present a new, effort-saving procedure capable of providing an accurate value ...
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