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  • Statistical study of resonance in AC traction systems equipped with Steinmetz circuit

     Monjo Mur, Lluis; Sainz Sapera, Luis; Rull Duran, Joan
    Electric power systems research
    Date of publication: 2013-10
    Journal article

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    tAC traction systems can be 25 kV/50 Hz single-phase, non-linear, time-varying loads of random naturecausing unbalance and distortion of the supply voltages. To reduce voltage unbalance, thyristor controlledreactances are usually delta-connected with traction systems. This setup, called Steinmetz circuit, canadapt reactance values to traction load fluctuations in order to balance consumed currents. To avoidvoltage distortion problems due to harmonic currents injected by traction loads, resonances betweenthe Steinmetz and supply system reactances ¿observed¿ from the traction system must be analyzed. Thispaper characterizes stochastic behavior of these resonances, which is caused by random variations intraction power consumption. The study used simulations of an AC traction system with intercity servicesand measurements of a French railway traction substation.

    AC traction systems can be 25 kV/50 Hz single-phase, non-linear, time-varying loads of random naturecausing unbalance and distortion of the supply voltages. To reduce voltage unbalance, thyristor controlledreactances are usually delta-connected with traction systems. This setup, called Steinmetz circuit, canadapt reactance values to traction load fluctuations in order to balance consumed currents. To avoidvoltage distortion problems due to harmonic currents injected by traction loads, resonances betweenthe Steinmetz and supply system reactances “observed” from the traction system must be analyzed. Thispaper characterizes stochastic behavior of these resonances, which is caused by random variations intraction power consumption. The study used simulations of an AC traction system with intercity servicesand measurements of a French railway traction substation.

  • Model of discharge lamps with saturated magnetic ballast and non-square arc voltage

     Molina, Julio; Sainz Sapera, Luis; Monjo Mur, Lluis
    Electric power systems research
    Date of publication: 2013-11-01
    Journal article

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    Harmonic modeling of high intensity discharge lamps with magnetic ballast has been extensively studied because they are energy-efficient lighting devices commonly used in industrial and public installations, and can be an important source of harmonics. This kind of modeling usually considers the linear saturation curve of the magnetic ballast and represents the arc voltage by a square waveform. However, both assumptions can be far from describing actual lamp behavior, affecting the accuracy of the model. This paper proposes a novel characterization of high intensity discharge lamps considering both the nonlinear behavior of the magnetic ballast and the non-square waveform of the arc voltage. The accuracy of the new model is validated with experimental measurements and compared to that of the traditional models.

  • Theoretical study of the steinmetz circuit design

     Monjo Mur, Lluis; Sainz Sapera, Luis; Riera Galceran, Sara; Bergas Jane, Joan Gabriel
    Electric power components and systems
    Date of publication: 2013-01-11
    Journal article

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  • Neutral conductor current in three-phase networks with compact fluorescent lamps

     Cunill Sola, Jordi; Sainz Sapera, Luis; Mesas García, Juan José
    Electric power systems research
    Date of publication: 2013-10
    Journal article

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    In this paper, expressions of the neutral conductor current in three-phase networks with compact fluorescent lamps (CFLs) are obtained from a CFL ¿black-box¿ model proposed in the literature. These expressions allow studying and performing a sensitivity analysis of the impact of CFLs on neutral current. The influence of CFL model parameters, as well as supply voltage unbalance, number of CFLs per phase and different types of CFLs per phase, on the neutral current is also investigated. The obtained results are validated with measurements and PSCAD/EMTDC simulations

  • Model of discharge lamps with magnetic ballast

     Molina, Julio; Sainz Sapera, Luis; Mesas García, Juan José; Bergas Jane, Joan Gabriel
    Electric power systems research
    Date of publication: 2013-02
    Journal article

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    Magnetic ballast discharge lamp modeling has been extensively studied because these lamps can be an important source of harmonics. Discharge lamp models usually represent the arc voltage by a square waveform. However, this waveform can be far from actual arc voltages, which affects the accuracy of the lamp models. This paper investigates the actual arc voltage behavior of discharge lamps from laboratory measurements and proposes a novel characterization of these voltages to reformulate the conventional models. The accuracy of the new model is validated with experimental measurements.

  • Parameter estimation procedures for compact fluorescent lamps with electronic ballasts

     Sainz Sapera, Luis; Cunill Sola, Jordi; Mesas García, Juan José
    Electric power systems research
    Date of publication: 2013-02
    Journal article

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  • Determination of the induction machine Parameters from Starting Transient Measurements  Open access

     Kojooyan Jafari, Hengameh
    Defense's date: 2013-07-26
    Universitat Politècnica de Catalunya
    Theses

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    This Thesis study the parameters estimation of the induction machine with the single-cage and doublecage models, using the stator currents, voltages and mechanical speed from a starting transient. The dynamic equations of the induction machine are expressed in the synchronous reference frame because in this reference the values of the direct and quadrature currents have a slower variation than those in the other reference frames. This reference frame is important to facilitate the data filtering. The proposed method for the single-cage parameters estimation introduces an approximation of the rotor flux using the stator currents and voltages. It has been demonstrated in the thesis that this approximation improves the accuracy of the calculated parameters significantly. Two different methods to calculate the parameters have been developed. The first is based on the linear least-square method and the second on the resolving of a nonlinear system of equations. A detailed error study of the parameters and predicted behavior have been made in the thesis. An interesting result of the error study is that it is very important that the speed of the points be used in the calculations. It is very important to use the points with the maximum torque speed and points near the synchronous speed. The thesis presents the two first methods developed for parameters estimation of the induction machine with double-cage model using data from a starting transient. The other methods known in the literature use steady state data. Both methods use data from the point of maximum torque to the synchronous speed to calculate the parameters of a single-cage model, because the torque- and current-speed curves of this single-cage fit very well with the torque- and current-speed curves of the double-cage. Later, the first method uses a point with a speed near to zero speed and a point in the synchronous speed and other single-cage is calculated. With these two singlecages the impedances of three points are calculated and they are used to estimate the six parameters of the double-cage model solving a nonlinear system of equations. The second method, called instantaneous power method, uses the fact that the averaged transient torque has similar values to the steady-state torque in the mechanical transient region. Then, several impedance values are calculated for points with different speeds in this region, where the effects of the double-cage are more important. Finally, with impedance values in the synchronous speed and the maximum torque speed obtained with the regression method and impedance values obtained with the instantaneous power method, a set of non linear equations are defined. Their solution is the estimated parameters of the induction machine double-cage model.

  • Aportacions a la modelització de la màquina d'inducció de gàbia d'esquirol  Open access

     Monjo Mur, Lluis
    Defense's date: 2013-07-25
    Universitat Politècnica de Catalunya
    Theses

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    En aquesta tesi es tracten en profunditat diversos aspectes sobre la modelització de la màquina d’inducció de gàbia d’esquirol. En el primer capítol, a partir dels paràmetres i de les característiques elèctriques i mecàniques pels fabricants d’aerogeneradors de velocitat fixa, s’analitza la bondat dels models lineals clàssics de la literatura: el model de simple gàbia i el model de doble gàbia. Els resultats de l’estudi permeten concloure que, el model de doble gàbia és més flexible i permet ajustar completament tots els requeriments. Aquests resultats teòrics, són validats en diferents motors de baixa potència. En el segon capítol s’analitza el comportament no lineal de la màquina degut a l’efecte de la saturació magnètica. L’assaig de diferents motors amb diferents nivells de saturació, mostra experimentalment que les corbes de parelllliscament i corrent-lliscament es veuen afectades pel grau de saturació de la màquina. Per modelitzar analíticament la saturació es proposa una funció que ajusta les mesures experimentals. Com a solució òptima es proposa la utilització del model de doble gàbia en el què la reactància de dispersió de l’estator és no lineal. En el tercer capítol, s’analitza el comportament de la màquina en la zona de fre i es presenten mesures experimentals que mostren que es deformen el alguns motors les corbes de parell-lliscament en aquesta zona de treball. Aquest efecte pot ser explicat per la presència d’harmònics de camp, motiu pel que els models lineals no són capaços de reproduir-lo. En aquest capítol s’analitza la presència d’aquests harmònics de camp i s’utilitza un esquema equivalent que ajusta de manera satisfactòria els resultats obtinguts al laboratori. Finalment en el quart capítol, s’analitzen els efectes dels sots de tensió en els aerogeneradors de velocitat fixa. S’estudia l’efecte del model de la màquina i de la debilitat o no de la xarxa a la què roman connectada la màquina quan aquesta es veu sotmesa a un sot de tensió. Es proposa alguns indicadors per avaluar l’estabilitat de la màquina en aquestes condicions.

    This Thesis analyzes some aspects of the modelisation of the squirrel-cage induction machine. The first step analyzed is, from parameters and conditions given from a manufacturer of fixed-speed induction generators, the Thesis studies the classic linear models in the literature: the single- and double-cage induction machine models. The study results confirm that the double-cage model is able to fit all the requirements. Results of the theoretical study are also validated with experimental measurements obtained from several test in different motors. Secondly, the non-linear behavior of the induction machine due to the magnetic saturation has been treated. From experimental measurements, it could be demonstrated that the torque- and current-slip curves are affected by the saturation. In order to model this phenomenon, a magnetic saturation function is presented and its goodness is validated with the experimental data. To fit the torque- and current-slip curves, a steady-state equivalent circuit with a non-linear leakage stator reactance is presented as the best solution. The following step is to analyze the behavior of the induction machine in the braking regime. Measurements in these conditions are made, and they show how torque-slip curves are deformed with and high increase of the torque. This behavior cannot be reproduced by the single- and the double-cage model. One explanation of this phenomenon is the presence of space harmonics. In this chapter, space harmonics are presented and a justification of the equivalent chain single-cage circuit is made. With this steady-state equivalent circuit it is possible to estimate parameters that can fit the measurements made in laboratory. Finally, the Thesis analyzes the effects of the voltage sags in fixed-speed wind turbines which are based in squirrelcage induction machines. For this task, the effects of the modelisation of the induction machine and the weakness of the grid are studied. In this point, some indicators are presented to evaluate the stability of the machine in these conditions.

  • Electrotecnia. Problemas de examen resueltos

     Pedra Duran, Joaquin; Corcoles Lopez, Felipe; Sainz Sapera, Luis
    Date of publication: 2013-09
    Book

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  • Study of the Steinmetz circuit influence on AC traction system resonance

     Sainz Sapera, Luis; Monjo Mur, Lluis; Riera, Sara; Pedra Duran, Joaquin
    IEEE transactions on power delivery
    Date of publication: 2012-10-01
    Journal article

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    Traction systems are single-phase, nonlinear loads, which can unbalance and pollute supply voltages. To reduce voltage unbalance, reactances are usually connected in delta configuration with traction systems. This setup is called the Steinmetz circuit. Parallel and series resonances can occur between the Steinmetz capacitor and system inductors, increasing voltage distortion. Thus, it is important to analyze the parallel resonance “observed” from the traction system to avoid harmonic problems due to its injected harmonic currents. This paper studies this resonance analytically and presents simple expressions to locate it. Experimental measurements are also provided to validate the obtained analytical results. These expressions are also used to analyze resonance in several power systems in the literature.

  • Harmonic interaction influence due to current source shunt filters in networks supplying nonlinear loads

     Sainz Sapera, Luis; Balcells Sendra, Josep
    IEEE transactions on power delivery
    Date of publication: 2012
    Journal article

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  • Review of magnetic ballast discharge lamp models

     Molina, Julio; Mesas García, Juan José; Sainz Sapera, Luis
    IASTED European Conference on Power and Energy Systems
    Presentation's date: 2011-06-22
    Presentation of work at congresses

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  • Currents' physical components (CPC) concept in wind farm harmonic current studies

     Sainz Sapera, Luis; Cunill Sola, Jordi
    International Conference on Renewable Energies and Power Quality
    Presentation's date: 2011-04-13
    Presentation of work at congresses

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    Experimental measurements about harmonic current mitigation of electric vehicle battery chargers  Open access

     Sainz Sapera, Luis; Balcells Sendra, Josep
    International Conference on Renewable Energies and Power Quality
    Presentation's date: 2011-04-13
    Presentation of work at congresses

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    The expected high penetration of battery chargers for electric vehicles (EV) in electric networks is foreseen as a potential problem for power quality. Battery chargers are nonlinear devices that inject harmonic currents and pollute network voltages. Thus, their harmonic emissions must be analyzed and reduced by harmonic mitigation techniques to avoid future problems. This paper analyzes and reports some real case measurements of harmonics injected by single- and three-phase battery chargers and their attenuation using line choke inductances.

  • On the square arc voltage waveform model in magnetic discharge lamp studies

     Molina, Julio; Sainz Sapera, Luis; Mesas García, Juan José
    International Conference on Power Engineering, Energy and Electrical Drives
    Presentation's date: 2011-05-11
    Presentation of work at congresses

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    The current number of magnetic and electronic ballast discharge lamps in power distribution systems is increasing because they perform better than incandescent lamps. This paper studies the magnetic discharge lamp modeling. In particular, the arc voltage waveform is analyzed and the limitations of the square waveform model are revealed from experimental measurements.

  • Experimental measurements of fluorescent lamp harmonic current emissions and their impact on neutral current

     Cunill Sola, Jordi; Mesas García, Juan José; Sainz Sapera, Luis
    IASTED European Conference on Power and Energy Systems
    Presentation's date: 2011-06-22
    Presentation of work at congresses

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    On electric vehicle battery charger modeling  Open access

     Sainz Sapera, Luis; Mesas García, Juan José; Balcells Sendra, Josep
    EA4EPQ International Conference on Renewable Energies and Power Quality
    Presentation's date: 2011-04-13
    Presentation of work at congresses

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    The increase of electric vehicle (EV) battery chargers connected to electric networks could lead to future harmonic problems in power systems. These loads are nonlinear devices that inject harmonic currents and pollute network voltages. Thus, battery charger modeling must be studied in detail to determine their harmonic emissions and prevent future problems. This paper investigates EV battery charger behavior, analyzes its equivalent circuit and reports a model for each conduction mode of the circuit. Experimental measurements and PSpice numerical simulations support the study.

  • Low-watt compact fluorescent lamps with electronic ballasts

     Cunill Sola, Jordi; Mesas García, Juan José; Sainz Sapera, Luis
    International Conference on Power Engineering, Energy and Electrical Drives
    Presentation's date: 2011-05-11
    Presentation of work at congresses

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  • Deterministic and stochastic assessment of the harmonic currents consumed by discharge lamps

     Mesas García, Juan José; Sainz Sapera, Luis; Ferrer Biosca, Alberto
    Electric power systems research
    Date of publication: 2011-01
    Journal article

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  • Influence of Steinmetz circuit capacitor degradation on series resonance of networks

     Sainz Sapera, Luis; Caro Huertas, Manuel; Caro, Eduardo
    European transactions on electrical power
    Date of publication: 2011-07
    Journal article

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  • Caracterización experimental y análisis estadístico de conjuntos de dispositivos no lineales en instalaciones eléctricas

     Martin Cañadas, Maria Elena; Mesas García, Juan José; Cunill Sola, Jordi; Clua Ruiz, Jordi; Sainz Sapera, Luis
    Participation in a competitive project

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  • Parameter estimation procedure for models of single-phase uncontrolled rectifiers

     Mesas García, Juan José; Sainz Sapera, Luis; Molina, Julio
    IEEE transactions on power delivery
    Date of publication: 2011-07
    Journal article

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  • Stochastic assessment of distribution system resonance frequencies with capacitors or shunt filters

     Mesas García, Juan José; Sainz Sapera, Luis
    Electric power systems research
    Date of publication: 2011-01
    Journal article

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  • Estudio y caracterización de cargas no lineales  Open access  awarded activity

     Mesas García, Juan José
    Defense's date: 2010-01-27
    Department of Electrical Engineering, Universitat Politècnica de Catalunya
    Theses

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    As a continuation of the work done by the QSE (Electrical Supply Quality) research group at the UPC (Polytechnic University of Catalonia) on non-linear load modelling to determine harmonic distortion in electrical power systems, this thesis consists of the carrying out of a series of studies of the most usual non-linear loads in the said systems (single-phase and three-phase rectifiers with capacitive filter, three-phase 6-pulse rectifiers and discharge lamps), basically aiming to characterize their behaviour and assess their influence on electrical power systems. The thesis was prepared in cooperation with the GNOM (Group of Numerical Optimization and Modelling) research group at the UPC in order to be able to analyse the numerical problem raised by the system of non-linear equations which characterizes each of the non-linear loads, as well as being able to approach optimization issues with some certainty of success. In summary, the aims of this thesis are as follows: -To analyse modelling of the most usual four non-linear loads in electrical power systems in order to incorporate the invariant concept in a justified way and establish ranges of values for the said invariants depending on their usual operating conditions. -To exploit the possibilities offered by invariants and, on the basis of the ranges of values obtained for each of them, to proceed to characterize the deterministic behaviour of the non-linear loads which are the object of the study and also to analyse the phenomena of harmonic cancellation and interaction. -To describe and study experimentally, also on the basis of invariants, the fundamental and harmonic currents (magnitude and angle) consumed by the non-linear loads considered in this thesis, whether by obtaining experimental models (databases) validated both experimentally and numerically, by validating the studied analytical models experimentally or by fitting the parameters of any of the previous models (parameter estimation) on the basis of experimental acquisitions. -To study the neutral conductor current in three-phase systems to which single-phase non-linear loads are connected (in particular, single-phase rectifiers with capacitive filter), by using invariants and validating the results of this experimentally.

    Como continuación de los trabajos realizados por el grupo de investigación QSE (Calidad del Suministro Eléctrico) de la UPC (Universidad Politécnica de Cataluña) sobre modelización de cargas no lineales para la determinación de la distorsión armónica en los sistemas eléctricos de potencia, se ha realizado como tesis una serie de estudios sobre las cargas no lineales más habituales en dichos sistemas (rectificadores monofásicos y trifásicos con filtro capacitivo, rectificadores trifásicos de 6 pulsos y lámparas de descarga) encaminados básicamente a la caracterización de su comportamiento y al análisis de su influencia en los sistemas eléctricos de potencia. La tesis se ha desarrollado en colaboración con el grupo de investigación GNOM (Grupo de Optimización Numérica y Modelización) de la UPC para poder analizar el problema numérico planteado por el sistema de ecuaciones no lineales que caracteriza cada una de las cargas no lineales, así como poder abordar con garantías problemas de optimización. Resumidamente, los objetivos de esta tesis son: -Analizar la modelización de las cuatro cargas no lineales más habituales en los sistemas eléctricos de potencia con el objetivo de introducir de forma justificada el concepto de invariante y establecer rangos de valores para dichos invariantes de acuerdo a sus condiciones habituales de funcionamiento. -Aprovechar las posibilidades que ofrecen los invariantes y, a partir de los rangos de valores obtenidos para cada uno de ellos, proceder a caracterizar el comportamiento determinístico de las cargas no lineales objeto de estudio y también a analizar los fenómenos de la cancelación y la interacción armónica. -Caracterizar y estudiar experimentalmente, también a partir de los invariantes, las intensidades fundamental y armónicas (módulo y ángulo) que consumen las cargas no lineales consideradas en esta tesis, ya sea mediante la obtención de modelos experimentales (bases de datos) validados tanto experimental como numéricamente, la validación experimental de los modelos analíticos estudiados o bien el ajuste de los parámetros de cualquiera de los anteriores modelos (estimación de parámetros) a partir de adquisiciones experimentales. -Estudiar la intensidad del neutro en sistemas trifásicos en los que hay conectadas cargas no lineales monofásicas (en particular, rectificadores monofásicos con filtro capacitivo), utilizando los invariantes y validando experimentalmente los resultados que se obtengan.

  • Estudio del circuito simetrizador Steinmetz en sistemas con polución armónica  Open access

     Caro Huertas, Manuel
    Defense's date: 2010-01-27
    Department of Electrical Engineering, Universitat Politècnica de Catalunya
    Theses

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    The main bulk of electric power systems use a three¿phase configuration with an alternating current flow. Pursuing the optimal performance of these networks and avoiding possible technical problems, it is preferred balanced operating conditions, i.e., the currents of all phases have the same magnitude and form a direct sequence with a phase of 120º. However, if several single¿phase loads (such as high speed traction systems) are present in these systems, the operating condition turns unbalanced, provoking an asymmetric voltage supply. This undesirable working condition can be avoided by the use of two reactances connected with the single-phase load using a triangle configuration, in such a way that the total current consumption turns out to be balanced. This approach is commonly known as Steinmetz circuit or symmetrizing circuit. Due to the reactances of the symmetrizing circuit, the connection of the circuit in an electric network changes the system frequency response, appearing new resonances of several types and presenting impedance values too small or too large. Moreover, the quantity of nonlinear loads (i.e., loads with consume nonsinusoidal currents, such as arc furnaces, power electronics devices like high-speed rail systems...) is increasing nowadays. The harmonic current injection by these charges may interact with the resonances caused by the Steinmetz circuit, resulting in a large harmonic distortion in voltage. The aim of this doctoral thesis is to analyze the presence of several types of resonances in order to avoid this problem. It is used a simplified scheme of a network in which the single¿phase load and the symmetrized circuit are connected. This system also encloses nonlinear loads that generate harmonic currents. This set is analyzed from the viewpoint of nonlinear loads and of the network for parallel and series resonance frequencies location, respectively. By obtaining these resonant frequencies and knowing the harmonic injection of nonlinear loads, the trouble of voltage supply distortion can be anticipated and avoided.

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    Deterministic and stochastic study of wind farm harmonic currents  Open access

     Sainz Sapera, Luis; Mesas García, Juan José; Teodorescu, Remus; Rodriguez Cortes, Pedro
    IEEE transactions on energy conversion
    Date of publication: 2010-12
    Journal article

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    Wind farm harmonic emissions are a well-known power quality problem, but little data based on actual wind farm measurements are available in literature. In this paper, harmonic emissions of an 18MWwind farm are investigated using extensive measurements, and the deterministic and stochastic characterization of wind farm harmonic currents is analyzed. Specific issues addressed in the paper include the harmonic variation with the wind farm operating point and the random characteristics of their magnitude and phase angle.

  • Deterministic and stochastic study of the three-phase non-linear load behavior

     Ferrer Biosca, Alberto; Mesas García, Juan José; Sainz Sapera, Luis
    Date of publication: 2009
    Book chapter

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    The paper examines the deterministic and stochastic behavior of three-phase uncontrolled rectifiers and three-phase 6-pulse rectifiers from extensive simulations performed by a MATLAB customized program. The study is based on non-linear load invariants and analyzes the harmonic current magnitudes and phase angles of these loads. Invariants are the minimum number of parameters characterizing non-linear loads univocally. Two practical laboratory examples are presented to illustrate the numerical study.

  • Discharge lamp harmonic interaction study by Monte Carlo simulation and experimental measurements

     Ferrer Biosca, Alberto; Mesas García, Juan José; Sainz Sapera, Luis
    Date of publication: 2009
    Book chapter

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  • Estimation of single-phase uncontrolled recitifier parameters

     Mesas García, Juan José; Sainz Sapera, Luis; Ferrer Biosca, Alberto
    IASTED International Conference on Power and Energy Systems
    Presentation of work at congresses

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  • Tecnología eléctrica. 2a. edición

     Boix Aragonès, Oriol; Sainz Sapera, Luis; Corcoles Lopez, Felipe; Suelves Joanxich, Francisco Jose
    Date of publication: 2009-09-14
    Book

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  • Deterministic and stochastic study of the three-phase non-linear load behavior

     Mesas García, Juan José; Sainz Sapera, Luis; Ferrer Biosca, Alberto
    IEEE International Conference on Power Engineering, Energy and Electrical Drives
    Presentation's date: 2009
    Presentation of work at congresses

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    The paper examines the deterministic and stochastic behavior of three-phase uncontrolled rectifiers and three-phase 6-pulse rectifiers from extensive simulations performed by a MATLAB customized program. The study is based on non-linear load invariants and analyzes the harmonic current magnitudes and phase angles of these loads. Invariants are the minimum number of parameters characterizing non-linear loads univocally. Two practical laboratory examples are presented to illustrate the numerical study.

  • Discharge lamp harmonic interaction study by Monte Carlo simulation and experimental measurements

     Mesas García, Juan José; Sainz Sapera, Luis; Ferrer Biosca, Alberto
    IEEE International Conference on Power Engineering, Energy and Electrical Drives
    Presentation's date: 2009
    Presentation of work at congresses

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    The growing presence of discharge lamps in power distribution systems has increased the harmonic distortion in these systems. The paper studies the magnetic ballast discharge lamp modelization with and without harmonic interaction. The supply harmonic voltage influence on lamp behavior is analyzed by Monte Carlo simulation. The results are validated with experimental measurements.

  • Deterministic and experimental study on three-phase 6-pulse rectifiers

     Mesas García, Juan José; Sainz Sapera, Luis; Ferrer Biosca, Alberto
    IASTED International Conference on Power and Energy Systems
    Presentation of work at congresses

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  • Three-phase transformer modeling for unbalanced conditions-Part II: General formulation

     Corcoles Lopez, Felipe; Sainz Sapera, Luis; Pedra Duran, Joaquin; Sánchez-Navarro, J; Salichs Vivancos, Miguel
    IET electric power applications
    Date of publication: 2009-01
    Journal article

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  • Modelling of squirrel-cage induction motors for electromagnetic transient programs

     Pedra Duran, Joaquin; Candela Garcia, Jose Ignacio; Sainz Sapera, Luis
    IET electric power applications
    Date of publication: 2009-03
    Journal article

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  • Analytical study of the series resonance in power systems with the Steinmetz circuit

     Sainz Sapera, Luis; Caro, M; Caro, E
    IEEE transactions on power delivery
    Date of publication: 2009-10
    Journal article

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  • Background voltage distortion influence on the power electric systems in the presence of the Steinmetz circuit

     Sainz Sapera, Luis; Pedra Duran, Joaquin; Caro, M
    Electric power systems research
    Date of publication: 2009-01
    Journal article

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  • Three-phase full-wave rectifier study with experimental measurements

     Sainz Sapera, Luis; Mesas García, Juan José; Ferrer Biosca, Alberto
    Electric power systems research
    Date of publication: 2009-04
    Journal article

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  • Deterministic and stochastic study of the single-phase non-linear load behavior

     Mesas García, Juan José; Sainz Sapera, Luis; Ferrer Biosca, Alberto
    IASTED International Conference on Power and Energy Systems
    Presentation of work at congresses

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  • Stochastic study of the harmonic response of electric systems with capacitors and shunt filters

     Sainz Sapera, Luis; Mesas García, Juan José
    IASTED International Conference on Power and Energy Systems
    Presentation of work at congresses

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  • Effects of balanced and unbalanced voltage sags on DC adjustable-speed drives

     Pedra Duran, Joaquin; Sainz Sapera, Luis; Corcoles Lopez, Felipe; Bergas Jane, Joan Gabriel; Blas Del Hoyo, Alfredo de
    Electric power systems research
    Date of publication: 2008-06
    Journal article

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  • Three-phase transformer modelling for unbalanced conditions, Part 1: core modelling and introductory examples

     Corcoles Lopez, Felipe; Sainz Sapera, Luis; Pedra Duran, Joaquin; Sanchez-Navarro, J; Salichs Vivancos, Miguel
    IET electric power applications
    Date of publication: 2008-03
    Journal article

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  • Characterization of non-linear load behavior

     Sainz Sapera, Luis; Mesas García, Juan José; Ferrer Biosca, Alberto
    Electric power systems research
    Date of publication: 2008-10
    Journal article

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  • Effects of symmetrical voltage sags on squirrel-cage induction motors

     Pedra Duran, Joaquin; Sainz Sapera, Luis; Corcoles Lopez, Felipe
    Electric power systems research
    Date of publication: 2007-10
    Journal article

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  • Effects of unsymmetrical voltage sags on squirrel-cage induction motors

     Pedra Duran, Joaquin; Corcoles Lopez, Felipe; Sainz Sapera, Luis
    IET generation, transmission and distribution
    Date of publication: 2007-07
    Journal article

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  • Theoretical calculation of inrush currents in three- and five-legged core transformers

     Sainz Sapera, Luis; Corcoles Lopez, Felipe; Pedra Duran, Joaquin; Guasch, L
    IEEE transactions on power delivery
    Date of publication: 2007-04
    Journal article

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  • Single-phase full-wave rectifier study with experimental measurements

     Sainz Sapera, Luis; Pedra Duran, Joaquin; Mesas García, Juan José
    Electric power systems research
    Date of publication: 2007-03
    Journal article

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  • Influence of the Steinmetz circuit capacitor failure on the electric system harmonic response

     Sainz Sapera, Luis; Pedra Duran, Joaquin; Caro, M
    IEEE transactions on power delivery
    Date of publication: 2007-04
    Journal article

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  • Estudio y caracterización de dispositivos no lineales y su interacción en instalaciones eléctricas industriales

     Sainz Sapera, Luis; Salichs Vivancos, Miguel; Cunill Sola, Jordi; Clua Ruiz, Jordi; Mesas García, Juan José
    Participation in a competitive project

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  • Harmonic modelling of induction motors

     Pedra Duran, Joaquin; Sainz Sapera, Luis; Corcoles Lopez, Felipe
    Electric power systems research
    Date of publication: 2006-07
    Journal article

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