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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Recent Submissions

  • Symmetrical and unsymmetrical voltage sag effects on the three-phase synchronous machine stability 

    Aguilar Galván, Daniel; Rolán Blanco, Alejandro; Vázquez, Gerardo; Córcoles López, Felipe; Rodríguez Cortés, Pedro (2009)
    Conference lecture
    Open Access
    This paper focuses on the effects of voltage sags, both symmetrical and unsymmetrical, on the three-phase Synchronous Machine (SM). Voltage sags on SM cause speed variations, current and torque peaks and hence may cause ...
  • Reduced-order models of squirrel-cage induction generators for fixed-speed wind turbines under unbalanced grid conditions 

    Rolán Blanco, Alejandro; Córcoles López, Felipe; Bogarra Rodríguez, Santiago; Monjo Mur, Lluís; Pedra Durán, Joaquim (2016-06)
    Article
    Open Access
    This paper develops a study of reduced-order models for squirrel-cage induction generators used in the fixed-speed wind turbines. The squirrel-cage of these generators must be modeled with a double-cage for accuracy purposes. ...
  • Doubly fed induction generator-based variable-speed wind turbine: proposal of a simplified model under a faulty grid with short-duration faults 

    Rolán Blanco, Alejandro; Pedra Durán, Joaquim (2019-08)
    Article
    Open Access
    The aim of this study is to provide a simplified model of a variable-speed wind turbine (VSWT) with the technology of a doubly-fed induction generator (DFIG) which operates under faulty grid conditions. A simplified model ...
  • Initialization of DFIG wind turbines with a phasor-based approach 

    Rolán Blanco, Alejandro; Pedra Durán, Joaquim (2019-03)
    Article
    Open Access
    The objective of this paper is to propose a simple approach to solve the steady state of a wind turbine (WT) equipped with a doubly-fed induction generator (DFIG) which can be used to initialize dynamic studies of the ...
  • Experimental study of the corona performance of aged sand-cast substation connectors 

    Riba Ruiz, Jordi-Roger; Bogarra Rodríguez, Santiago; Gómez Pau, Álvaro; Moreno Eguilaz, Juan Manuel (2020-06-01)
    Article
    Open Access
    Substation connectors, like many other high-voltage products, are tested once manufactured. However, the corona behavior of aged specimens can differ from that exhibited by newer ones, thus generating detrimental technical ...
  • Voltage sag influence on controlled three-phase grid-connected inverters according to the Spanish grid code 

    Bakkar, Mostafa; Bogarra Rodríguez, Santiago; Rolán Blanco, Alejandro; Córcoles López, Felipe; Saura Perisé, Jaime (2020-02-03)
    Article
    Open Access
    To ensure the safe operation of the grid, there are some requirements to be taken into consideration to connect power converters. During abnormal conditions – e.g. during voltage sags –, the control of the converters is a ...
  • Modelling VSCs connected to weak grids 

    Orellana Montaño, Luis Carlos; Prieto Araujo, Eduardo; Sainz Sapera, Luis; Cheah Mañé, Marc; Gomis Bellmunt, Oriol (2019)
    Conference report
    Restricted access - publisher's policy
    This paper addresses the oscillatory stability phenomena studied in the literature and reported by network operators in grid-connected VSC systems. Negative interactions have been observed at different frequencies in these ...
  • Arc tracking control in insulation systems for aeronautic applications: challenges, opportunities, and research needs 

    Riba Ruiz, Jordi-Roger; Gómez Pau, Álvaro; Moreno Eguilaz, Juan Manuel; Bogarra Rodríguez, Santiago (Multidisciplinary Digital Publishing Institute (MDPI), 2020-03-16)
    Article
    Open Access
    Next generation aircrafts will use more electrical power to reduce weight, fuel consumption, system complexity and greenhouse gas emissions. However, new failure modes and challenges arise related to the required voltage ...
  • An improved harmonic load flow formulation 

    Rashid, Asim; Mesas García, Juan José; Sainz Sapera, Luis (Taylor & Francis, 2019-10-21)
    Article
    Restricted access - publisher's policy
    The paper contributes an improved harmonic load flow formulation with fewer convergence problems but the same accurate results as traditional formulations. The proposed formulation approaches the harmonic load flow problem ...
  • Assessment of subsynchronous oscillations in AC grid-connected VSC systems with type-4 wind turbines 

    Sainz Sapera, Luis; Monjo Mur, Lluís; Cheah Mañé, Marc; Liang, Jun (2019-12-09)
    Article
    Open Access
    Converters are the key for increasing the development of renewable energy generation but their dynamic interaction with the grid has an important impact on stability. Oscillatory instabilities in different grid-connected ...
  • Admittance study of grid-connected VSCs for harmonic oscillatory instabilities 

    Sainz Sapera, Luis; Monjo, Luis; Cheah Mañé, Marc; Liang, Jun; Gomis Bellmunt, Oriol; Prieto Araujo, Eduardo (2019-09-17)
    Article
    Open Access
    Voltage source converters (VSCs) can reduce damping of grid-connected VSC systems at harmonic resonances, leading to system instability. The conductance of the VSC admittance can be shaped selecting appropriate VSC parameter ...
  • Advanced quiz development for students’ self-learning in power generation, transmission and distribution 

    Bogarra Rodríguez, Santiago; Corbalán Fuertes, Montserrat; Plaza, Inmaculada (SAGE PUBLICATIONS INC, 2019)
    Article
    Open Access
    Students’ learning can be improved by using online quizzes with a valuable feedback, especially in large groups, making it very interesting for engineering subjects which are based on mathematics. This paper presents the ...

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