Graphic summary
  • Show / hide key
  • Information


Scientific and technological production
  •  

1 to 50 of 134 results
  • Parameter estimation of wound-rotor induction motors from transient measurements

     Kojooyan, Hengameh; Monjo Mur, Lluis; Corcoles Lopez, Felipe; Pedra Duran, Joaquin
    IEEE transactions on energy conversion
    Date of publication: 2014-06
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    A new method for determination of the steady-state equivalent circuit parameters of wound-rotor induction motors using experimental data from starting transient measurements is presented. The algorithm data are the stator currents and voltages andmechanical speed. The algorithm uses the least-square method and motor dynamic equations in the synchronous reference frame. Moreover, an approximation of the rotor flux that improves the accuracy of the estimation method, as well as a detailed study of errors, is included. The estimation method is applied to starting transient measurement data of a 2 kW wound rotor induction motor, and the accuracy of the obtained parameters is verified by comparing steady-state torque- and current-slip curves calculated with the estimated parameters and those measured in the laboratory

    A new method for determination of the steady-state equivalent circuit parameters of wound-rotor induction motors using experimental data from starting transient measurements is presented. The algorithm data are the stator currents and voltages andmechanical speed. The algorithm uses the least-square method and motor dynamic equations in the synchronous reference frame. Moreover, an approximation of the rotor flux that improves the accuracy of the estimation method, as well as a detailed study of errors, is included. The estimation method is applied to starting transient measurement data of a 2 kW wound rotor induction motor, and the accuracy of the obtained parameters is verified by comparing steady-state torque- and current-slip curves calculated with the estimated parameters and those measured in the laboratory

  • Electrotecnia. Problemas de examen resueltos

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

     Share Reference managers Reference managers Open in new window

  • 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

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Esta Tesis estudia la estimación de parámetros de la máquina de inducción con el modelo de simple jaula y el modelo de doble jaula, usando las intensidades y tensiones del estator, y la velocidad mecánica de un transitorio de arranque. Las ecuaciones dinámicas de la máquina de inducción se han expresado en la referencia síncrona porque en esta referencia los valores de las intensidades directa y en cuadratura tienen una variación mas suave que en las otras referencias. Esto es importante para el filtrado de las medidas. El método propuesto para la estimación de parámetros de la simple jaula introduce una aproximación del flujo del rotor usando las intensidades y tensiones de estator. Se ha demostrado en la tesis que esta aproximación mejora la exactitud de los parámetros calculados de una forma significativa. Se han desarrollado dos métodos de cálculo de los parámetros distintos. El primero está basado en el método de mínimos cuadrados lineal y el segundo en la resolución de un sistema no lineal de ecuaciones. En la tesis se ha realizado un estudio detallado de los errores en los parámetros y el comportamiento de la máquina. Un resultado interesante del estudio de errores es que es muy importante la velocidad de los puntos usados en el cálculo. Es muy importante usar puntos con la velocidad en la zona de par máximo y puntos cerca de la velocidad de sincronismo. La tesis presenta los dos primeros métodos desarrollados para la estimación de los parámetros de la máquina de inducción con modelo de doble jaula usando datos de un transitorio de arranque. Los otros métodos conocidos en la literatura usan datos de régimen permanente. Ambos métodos usan datos desde el punto de par máximo hasta la velocidad síncrona para calcular los parámetros del modelo de simple jaula, porqué las curvas de par y corriente en función de la velocidad ajustan muy bien con las curvas del modelo de doble jaula. Además, el primer método usa un punto con una velocidad cerca de la velocidad cero que junto a un punto en la velocidad síncrona permite calcular los parámetros de otro modelo de simple jaula. Con estos dos modelos de simple jaula se calculan las impedancias de tres puntos y éstas son utilizadas para estimar los seis parámetros del modelo de doble jaula, resolviendo un sistema no lineal de ecuaciones. El segundo método, denominado método de la potencia instantánea, usa el hecho que en la región del transitorio mecánico el par transitorio promediado tiene un valor similar al par de régimen permanente. Entonces, los valores de varias impedancias son calculados para distintos puntos en esta región, donde los efectos de la doble jaula son más importantes. Finalmente, con los valores de impedancia en la velocidad síncrona y el punto de par máximo obtenidos con el método de regresión y los valores de impedancia obtenidos con el método de potencia instántanea, se define un conjunto de ecuaciones no lineales. La solución de éste son los parámetros estimados de la máquina de inducción con modelo de doble jaula.

    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

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    En aquesta tesi es tracten en profunditat diversos aspectes sobre la modelització de la màquina d¿inducció de gàbiad¿esquirol.En el primer capítol, a partir dels paràmetres i de les característiques elèctriques i mecàniques pels fabricantsd¿aerogeneradors de velocitat fixa, s¿analitza la bondat dels models lineals clàssics de la literatura: el model desimple gàbia i el model de doble gàbia. Els resultats de l¿estudi permeten concloure que, el model de doble gàbia ésmés flexible i permet ajustar completament tots els requeriments. Aquests resultats teòrics, són validats en diferentsmotors 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 parelllliscamenti corrent-lliscament es veuen afectades pel grau de saturació de la màquina. Per modelitzar analíticamentla saturació es proposa una funció que ajusta les mesures experimentals. Com a solució òptima es proposa lautilització 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 experimentalsque mostren que es deformen el alguns motors les corbes de parell-lliscament en aquesta zona de treball. Aquestefecte pot ser explicat per la presència d¿harmònics de camp, motiu pel que els models lineals no són capaços dereproduir-lo. En aquest capítol s¿analitza la presència d¿aquests harmònics de camp i s¿utilitza un esquemaequivalent 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 màquinaquan aquesta es veu sotmesa a un sot de tensió. Es proposa alguns indicadors per avaluar l¿estabilitat de la màquinaen aquestes condicions.

    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.

  • Behaviour of the doubly fed induction generator exposed to unsymmetrical voltage sags

     Rolan Blanco, Alejandro; Corcoles Lopez, Felipe; Pedra Duran, Joaquin
    IET electric power applications
    Date of publication: 2012-09
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Saturation effects on torque- and current¿slip curves of squirrel-cage induction motors

     Monjo Mur, Lluis; Corcoles Lopez, Felipe; Pedra Duran, Joaquin
    IEEE transactions on energy conversion
    Date of publication: 2012-12-24
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper measures and analyzes the saturation effects on torque- and current–slip curves of three squirrel-cage induction motors.Motor saturation is illustrated by three sets of measurements: I) torque and current for each slip measured at three voltage levels; II) short-circuit impedance measured at different current levels; and III) no-load impedance measured at different voltage levels. In test I, torque and current measured at reduced voltage are prorated to full voltage for comparison purposes. A double-cage model is used to model the motors, and the nonlinearity of their reactances is examined. In order to evaluate the individual weight of every nonlinear reactance on the observed saturated behavior, we try to fit the measurements considering that only one reactance of the double-cage model is nonlinear. Good agreement is obtained only when the stator leakage reactance is considered nonlinear. On the contrary, when magnetizing or remaining leakage reactances are considered nonlinear, they predict machine behaviors inconsistent with measurements. In otherwords, the saturation of the stator leakage reactance is the main contributor to torque and current behavior, while the saturation of the remaining reactances has a negligible influence. Consequently, when all voltage levels are considered, the squirrel-cage induction motors can be accurately modeled (with reasonable accuracy) with a double-cage modelwhere only the stator leakage reactance is considered nonlinear. When only a constant voltage level is considered, the paper also proves that a linear double-cage model (all reactances are linear) accurately predicts machine behavior at such voltage level.

  • 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

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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.

  • On fixed-speed WT generator modeling for rotor speed stability studies

     Pedra Duran, Joaquin; Corcoles Lopez, Felipe; Monjo Mur, Lluis; Bogarra Rodriguez, Santiago; Rolan Blanco, Alejandro
    IEEE transactions on power systems
    Date of publication: 2012-01-20
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper analyzes fixed-speed induction generator modeling oriented to rotor speed stability studies. The single- and double-cage models are compared. The effects of symmetrical voltage sags on generator behavior are studied in detail. The rotor speed stability of the turbine is also examined and rotor speed recovery time is proposed as an indicator of system stability. Significant differences in the results obtained for both models were found, e.g., the double-cage model shows better speed and voltage stability. For some generator designs, the single-cage model can lead to erroneous stability predictions because manufacturer data of such designs can only be fulfilled with a double-cage model. The use of the latter to simulate fixed-speed wind turbines with this type of designs is therefore strongly recommended. The simulations were carried out using PSpice and PSCAD/EMTDC.

  • Estudio del efecto de los huecos de tensión en el generador de inducción doblemente alimentado  Open access

     Rolan Blanco, Alejandro
    Defense's date: 2012-02-17
    Department of Electrical Engineering, Universitat Politècnica de Catalunya
    Theses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    The aim of this doctoral thesis is to analyse the dynamic behaviour of the doubly-fed induction generator exposed to voltage sags. This electrical machine is mainly used in variable-speed wind turbines. Due to the noticeable increase in recent years in grid integration of wind turbine energy systems, the transmission system operators have developed the grid codes, which are the technical specifications that wind turbines have to achieve when a fault occurs. Faults are the most common causes that originate voltage sags. Therefore, the first step to ensure electricity supply continuity as well as to improve power quality when this kind of faults occur is to analyse the dynamic behaviour of the generator exposed to voltage sags. The stator of the doubly-fed induction generator is directly connected to the grid, whereas its rotor is connected by means of a power converter. The converter consists of a rectifier or rotor-side converter and an inverter or grid-side converter, which are linked by a DC bus. It is assumed that the rotor-side converter keeps constant the rotor current in the synchronous reference frame during the entire event. This hypothesis allows the electrical transient to be solved analytically. The voltage limit of the rotor-side converter is also taken into account in order to determine the situations where the rotor current can be controlled. This doctoral thesis is structured as follows. Firstly, the mathematical model of voltage sags is given. Secondly, both dynamic and steady-state models of the doubly-fed induction machine are obtained. Thirdly, the steady-state behaviour of the doubly-fed induction generator is analysed for different generated powers and it is studied, by means of an analytical approach, its electrical transient when exposed to voltage sags. The analytical results are validated by numerical integration of the system of equations with a MATLAB ode solver and by means of the PSpice circuit simulator. It is also carried out an exhaustive study of the effect that voltage sags cause on the doubly-fed induction generator, considering all the typologies (symmetrical and unsymmetrical voltage sags) and varying their parameters (duration and depth). Moreover, the fault-clearing process is taken into account, which has a strong influence on the voltage that the rotor-side converter requires to control the rotor current. The terms abrupt sag and discrete sag stand for voltage sags whose voltage recovery is produced instantaneously or in different steps, respectively. Finally, by means of an analytical study, which is validated by the simulation of different loads exposed to voltage sags, a grouping of voltage sags whose voltage recovery is produced in different steps is proposed. It is observed that from the fourteen discrete voltage sag types in the literature, it is enough to consider only five types. This is a significant advantage, as the number of simulations or laboratory tests carried out on an electrical device exposed to voltage sags is reduced.

    El objetivo principal de la presente tesis doctoral es analizar el comportamiento dinámico del generador de inducción doblemente alimentado sometido a huecos de tensión. La aplicación por excelencia de esta máquina eléctrica se encuentra en los aerogeneradores de velocidad variable. Debido al considerable aumento en los últimos años de la integración a la red eléctrica de los sistemas eólicos de generación de energía eléctrica, los operadores del sistema de distintos países han creado los códigos de red, en los cuales se especifican las características de funcionamiento que deben cumplir los aerogeneradores cuando se produce una falta en la red. Las faltas son las causas más comunes que provocan huecos de tensión. Por tanto, el primer paso para garantizar una continuidad del suministro y unos determinados niveles de calidad de la energía eléctrica cuando se originan este tipo de perturbaciones es analizar el comportamiento dinámico del generador sometido a huecos de tensión. El generador de inducción doblemente alimentado se caracteriza por tener tanto el estator como el rotor conectados a la red eléctrica, el estator directamente y el rotor por medio de un convertidor electrónico. El convertidor está constituido por un rectificador o convertidor del lado de rotor y por un inversor o convertidor del lado de red, unidos mediante un bus de continua. Se considera que el convertidor del lado de rotor permite mantener constante la corriente del rotor en referencia sincronismo durante todo el evento. Esta hipótesis permite resolver analíticamente el transitorio eléctrico de la máquina. También se tiene en consideración el límite de tensión de dicho convertidor con el fin de determinar las situaciones en las que se puede controlar la corriente del rotor. La presente tesis doctoral se estructura de la siguiente manera. En primer lugar, se modelizan los huecos de tensión. En segundo lugar, se obtiene el modelo dinámico y el de régimen permanente de la máquina de inducción doblemente alimentada. En tercer lugar, se analiza el comportamiento de régimen permanente del generador de inducción doblemente alimentado para distintas potencias generadas y se estudia analíticamente el transitorio eléctrico del mismo cuando se somete a los distintos huecos de tensión. Los resultados analíticos se validan por medio de la integración numérica del sistema de ecuaciones mediante MATLAB y también utilizando el programa de simulación de circuitos PSpice. Por último, se realiza un estudio exhaustivo del efecto de los huecos de tensión sobre el generador de inducción doblemente alimentado, considerando todas las tipologías de huecos (simétricos y asimétricos) y la variación de sus parámetros (duración y profundidad). Además, se tiene en cuenta la influencia de la recuperación de la tensión, lo cual repercute notablemente en la tensión requerida por el convertidor para controlar la corriente del rotor. Los términos hueco abrupto y hueco discreto hacen referencia a un hueco de tensión cuya recuperación se produce de forma instantánea o por etapas, respectivamente Finalmente, por medio de un estudio analítico, validado por la simulación de distintas cargas sometidas a huecos de tensión, se propone un agrupamiento de los huecos con recuperación por etapas. Se observa que de las catorce tipologías de huecos discretos de la literatura, tan sólo es necesario estudiar cinco de ellas. Esto supone una notable ventaja, ya que se reduce considerablemente el número de simulaciones o de ensayos de laboratorio de un dispositivo eléctrico sobre el cual se desean estudiar los efectos de los huecos de tensión.

  • Study of reduced-order models of squirrel-cage induction motors

     Martin Cañadas, Maria Elena; de la Hoz Casas, Jordi; Monjo Mur, Lluis; Pedra Duran, Joaquin
    Electric power components and systems
    Date of publication: 2011-10-07
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Doubly fed induction generator subject to symmetrical voltage sags

     Rolan Blanco, Alejandro; Corcoles Lopez, Felipe; Pedra Duran, Joaquin
    IEEE transactions on energy conversion
    Date of publication: 2011-12
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Discrete fault-clearing instant influence on the simulation of voltage-source-inverter-fed adjustable-speed drives subjected to voltage sags

     Corcoles Lopez, Felipe; Bogarra Rodriguez, Santiago; Pedra Duran, Joaquin; Luna Alloza, Alvaro
    IET electric power applications
    Date of publication: 2011-05
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This study analyses the influence of modelling sags with discrete fault-clearing instants on the behaviour of adjustablespeed drives (ASDs) subjected to sags caused by faults. The effects are compared with those of sags modelled with simultaneous fault clearance in all faulted phases (i.e. abrupt fault clearance; the most common approach to voltage sag modelling). In many cases, abrupt fault clearance is far more severe than discrete fault clearance. Thus, if an ASD rides through a more severe case of an abrupt fault clearance test, it will likely ride through a discrete fault clearance sag. As current protocols for testing the immunity of ASDs to voltage sags only consider abrupt fault clearance, it is not necessary to consider the more complicated discrete fault clearance in equipment sag-testing methodology if more severe abrupt clearance sags are properly chosen and tested.

  • ESTUDIO DEL IMPACTO DE LOS HUECOS DE TENSIÓN EN LA ESTABILIDAD DE LOS GENERADORES EÓLICOS

     Reus Pinilla, Jordi; Bogarra Rodriguez, Santiago; Monjo Mur, Lluis; Martin Cañadas, Maria Elena; Bargalló Perpiñà, Ramon; Suelves Joanxich, Francisco Jose; Pedra Duran, Joaquin
    Participation in a competitive project

     Share

  • 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

     Share Reference managers Reference managers Open in new window

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

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

     Share Reference managers Reference managers Open in new window

  • 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

     Share Reference managers Reference managers Open in new window

  • Saturation model for squirrel-cage induction motors

     Pedra Duran, Joaquin; Candela Garcia, Jose Ignacio; Barrera, A
    Electric power systems research
    Date of publication: 2009-07
    Journal article

     Share Reference managers Reference managers Open in new window

  • Parameter estimation of a transformer with saturation using inrush measurements

     Bogarra Rodriguez, Santiago; Font Piera, Antonio; Candela Garcia, Jose Ignacio; Pedra Duran, Joaquin
    Electric power systems research
    Date of publication: 2009-02
    Journal article

     Share Reference managers Reference managers Open in new window

  • Reconeixement Grup de Recerca Consolidat AGAUR 2009-2013

     Mesas García, Juan José; Sainz Sapera, Luis; Pedra Duran, Joaquin; Corcoles Lopez, Felipe; Salichs Vivancos, Miguel; Bargalló Perpiñà, Ramon; Martin Cañadas, Maria Elena; Cunill Sola, Jordi
    Award or recognition

     Share

  • 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

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • 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

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • On the determination of induction motor parameters from manufacturer data for electromagnetic transient programs

     Pedra Duran, Joaquin
    IEEE transactions on power systems
    Date of publication: 2008-11
    Journal article

     Share Reference managers Reference managers Open in new window

  • Aportación al modelado del motor trifásico de inducción con consideración de la saturación y el efecto de doble jaula

     Martin Cañadas, Maria Elena
    Defense's date: 2007-06-11
    Department of Electrical Engineering, Universitat Politècnica de Catalunya
    Theses

     Share Reference managers Reference managers Open in new window

  • 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

     Share Reference managers Reference managers Open in new window

  • 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

     Share Reference managers Reference managers Open in new window

  • 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

     Share Reference managers Reference managers Open in new window

  • 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

    View View Open in new window  Share Reference managers Reference managers Open in new window

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

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

     Share Reference managers Reference managers Open in new window

  • Parameter estimation of squirrel-cage induction motors without torque measurements

     Pedra Duran, Joaquin; Sainz Sapera, Luis
    IEE proceedings-Electric power applications
    Date of publication: 2006-03
    Journal article

     Share Reference managers Reference managers Open in new window

  • Study of the electric system harmonic response in the presence of the Steinmetz circuit

     Caro Silanes, Montserrat; Sainz Sapera, Luis; Pedra Duran, Joaquin
    Electric power systems research
    Date of publication: 2006-08
    Journal article

     Share Reference managers Reference managers Open in new window

  • Estimation of typical squirrel-cage induction motor parameters for dynamic performance simulation

     Pedra Duran, Joaquin
    IEE proceedings-Generation transmission and distribution
    Date of publication: 2006-03
    Journal article

     Share Reference managers Reference managers Open in new window

  • 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

     Share Reference managers Reference managers Open in new window

  • Study of neutral conductor current in three-phase networks with single-phase converters

     Sainz Sapera, Luis; Pedra Duran, Joaquin; Mesas García, Juan José
    IEEE transactions on power delivery
    Date of publication: 2006-07
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Comparative study of voltage sag effects on complete and reduced-order, single and double-cage models of induction motor

     Martin Cañadas, Maria Elena; Pedra Duran, Joaquin; Llaverias Sanmarti, Juan; Bargalló Perpiñà, Ramon
    XVII International Conference on Electrical Machines
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Steinmetz circuit influence on the electric system harmonic response

     Sainz Sapera, Luis; Pedra Duran, Joaquin; Caro Silanes, Montserrat
    IEEE transactions on power delivery
    Date of publication: 2005-04
    Journal article

     Share Reference managers Reference managers Open in new window

  • Capacitor and shunt filter influence in the electric system harmonic response

     Sainz Sapera, Luis; Pedra Duran, Joaquin; Herraiz, S
    IEEE transactions on power delivery
    Date of publication: 2005-04
    Journal article

     Share Reference managers Reference managers Open in new window

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

     Pedra Duran, Joaquin; Corcoles Lopez, Felipe; Suelves Joanxich, Francisco Jose
    IEEE transactions on power delivery
    Date of publication: 2005-01
    Journal article

     Share Reference managers Reference managers Open in new window

  • Symmetrical and unsymmetrical voltaje sag effects on three-phase transformers

     Pedra Duran, Joaquin; Sainz Sapera, Luis; Corcoles Lopez, Felipe; Guasch, L
    IEEE transactions on power delivery
    Date of publication: 2005-04
    Journal article

     Share Reference managers Reference managers Open in new window

  • A unified and simple model for uncontrolled rectifiers

     Herraiz, S; Sainz Sapera, Luis; Corcoles Lopez, Felipe; Pedra Duran, Joaquin
    Electric power systems research
    Date of publication: 2005-06
    Journal article

     Share Reference managers Reference managers Open in new window

  • Study of Aggregate Models for Squirrel-Cage Induction Motors

     Pedra Duran, Joaquin; Sainz Sapera, Luis; Corcoles Lopez, Felipe
    IEEE transactions on power systems
    Date of publication: 2005-08
    Journal article

     Share Reference managers Reference managers Open in new window

  • Study of electric system harmonic response

     Sainz Sapera, Luis; Caro Silanes, Montserrat; Pedra Duran, Joaquin
    IEEE transactions on power delivery
    Date of publication: 2004-04
    Journal article

     Share Reference managers Reference managers Open in new window

  • Harmonic non-linear transformer modeling

     Pedra Duran, Joaquin; Corcoles Lopez, Felipe; Sainz Sapera, Luis
    IEEE transactions on power delivery
    Date of publication: 2004-04
    Journal article

     Share Reference managers Reference managers Open in new window

  • Estimation of induction motor double-cage model parameters from manufacturer data

     Pedra Duran, Joaquin; Corcoles Lopez, Felipe
    IEEE transactions on energy conversion
    Date of publication: 2004-06
    Journal article

     Share Reference managers Reference managers Open in new window

  • Pspice computer model of a non-linear three-phase three-legged transformer

     Pedra Duran, Joaquin; Sainz Sapera, Luis; Corcoles Lopez, Felipe; Salichs Vivancos, Miguel
    IEEE transactions on power delivery
    Date of publication: 2004-01
    Journal article

     Share Reference managers Reference managers Open in new window

  • Effects of symmetrical and unsymmetrical voltaje sags on induction machines

     Guasch, L; Corcoles Lopez, Felipe; Pedra Duran, Joaquin
    IEEE transactions on power delivery
    Date of publication: 2004-04
    Journal article

     Share Reference managers Reference managers Open in new window

  • Effects of symmetrical voltaje sags on three-phase three-legged transformers

     Guasch, L; Corcoles Lopez, Felipe; Pedra Duran, Joaquin; Sainz Sapera, Luis
    IEEE transactions on power delivery
    Date of publication: 2004-04
    Journal article

     Share Reference managers Reference managers Open in new window

  • Estudio de los efectos de los huecos de tensión simétricos y asimétricos en los componentes eléctricos

     Pedra Duran, Joaquin; Corcoles Lopez, Felipe; Suelves Joanxich, Francisco Jose; Salichs Vivancos, Miguel; Reus Pinilla, Jordi; Bargalló Perpiñà, Ramon; Martin Cañadas, Maria Elena
    Participation in a competitive project

     Share

  • Study of voltage sag effects on three-phase transformers

     Sainz Sapera, Luis; Corcoles Lopez, Felipe; Pedra Duran, Joaquin; Guasch, L; Herraiz Jaramillo, Sergio
    11th IEEE International Conference on Harmonics and Quality of Power
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Transformadores

     Corcoles Lopez, Felipe; Pedra Duran, Joaquin; Salichs Vivancos, Miguel
    Date of publication: 2004-09-30
    Book

     Share Reference managers Reference managers Open in new window

  • Behaviour of Single-Phase Full-Wave Rectifier

     Herraiz Jaramillo, Sergio; Sainz Sapera, Luis; Pedra Duran, Joaquin
    European transactions on electrical power
    Date of publication: 2003-05
    Journal article

     Share Reference managers Reference managers Open in new window