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  • Reduction of Output Common Mode Voltage Using a Novel SVM Implementation in Matrix Converters for Improved Motor Lifetime

     Espina, Jordi; Ortega, Carlos; De Lilo, Liliana; Empringham, Lee; Balcells Sendra, Josep; Arias Pujol, Antoni
    IEEE transactions on industrial electronics
    Date of publication: 2014-11-01
    Journal article

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    This paper presents the study of an alternative space vector modulation (SVM) implementation for matrix converters (MCs), which reduces the output common mode (CM) voltage. The strategy is based on replacing the MC zero vectors with rotating ones. In doing this, the CM voltage (CMV) can be reduced, which, in turn, reduces the CM leakage current. By reducing the CM current, which flows inside the motor through the bearings and windings, the induction motor (IM) deterioration can be slowed down. This paper describes the SVM pattern and analyzes the CMV and the leakage current paths. Simulation and experimental results based on an MC-IM drive are provided to corroborate the presented approach.

    This paper presents the study of an alternative Space Vector Modulation (SVM) implementation for Matrix Converters (MC) which reduces the output Common Mode (CM) voltage. The strategy is based on replacing the MC zero vectors by the rotating ones. In doing this, the CM voltage can be reduced which in-turn reduces the CM leakage current. By reducing the CM current, which flows inside the motor through the bearings and windings, the Induction Motor (IM) deterioration can be slowed down. The paper describes the SVM pattern and analyses the CM voltage and the leakage current paths. Simulation and experimental results based on a MC-IM drive are provided to corroborate the presented approach.

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    Wavelet-based approach to evaluation of signal integrity  Open access

     Bialasiewicz, Jan T.; Gonzalez Diez, David; Balcells Sendra, Josep; Gago Barrio, Javier
    IEEE transactions on industrial electronics
    Date of publication: 2013-10-07
    Journal article

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    In this paper, we present a new approach to evaluation of signal integrity that is based on signal energy density as a function of time and frequency, represented by its wavelet scalogram. Using signal integrity ratio and cumulative energy ratio, we illustrate signal integrity analysis with simulated examples, followed by the demonstration of their usefulness through analysis of experimental data of a real audio amplifier. These figures of merit represent the extent to which the integrity of a signal is diminished by the electromagnetic interference effects and/or nonlinear processes.

    In this paper, we present a new approach to evaluation of signal integrity that is based on signal energy density as a function of time and frequency, represented by its wavelet scalogram. Using signal integrity ratio and cumulative energy ratio, we illustrate signal integrity analysis with simulated examples, followed by the demonstration of their usefulness through analysis of experimental data of a real audio amplifier. These figures of merit represent the extent to which the integrity of a signal is diminished by the electromagnetic interference effects and/or nonlinear processes.

    Postprint (author’s final draft)

  • Effect of driver to gate coupling circuits on EMI produced by SiC MOSFETS

     Balcells Sendra, Josep; Bogonez Franco, Francisco
    International Symposium on Electromagnetic Compatibility
    Presentation's date: 2013-09-03
    Presentation of work at congresses

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    This work presents a study of the influence of different gate driver circuits on the switching behavior and EMI produced by SiC MOSFET devices used in a boost converter. The paper includes several simulations of switching behavior using different VGS voltage levels and different passive RCD (Resistance Capacitor Diode) circuits to interface the driver to the SiC MOS gate and several tests of conducted and radiated EMI for each one of the interface circuits. The paper also includes a comparison of both aspects (switching and EMI) when using different gate voltage levels. The study reveals that gate voltage has little impact on switching behavior and therefore on conducted and radiated EMI, while gate RCD coupling circuits have a noticeable impact. The EMI reduction, when using the adequate driver-gate circuit may be in the order of 10 dB at certain frequencies in the conducted band and up to 20 dB for certain frequencies in the radiated band.

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    Reduction of electromagnetic interference susceptibility in small-signal analog circuits using complementary split-ring resonators  Open access

     Perez Robles, Daniel; Gil Galí, Ignacio; Gago Barrio, Javier; Fernández García, Raúl; Balcells Sendra, Josep; Gonzalez Diez, David; Berbel Artal, Nestor; Mon Gonzalez, Juan
    IEEE TRANSACTIONS ON COMPONENTS, PACKAGING AND MANUFACTURING TECHNOLOGY
    Date of publication: 2012-02-10
    Journal article

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    Low-frequency analog and digital electronic circuits are susceptible to electromagnetic interference in the radiofrequency (RF) range. This disturbance is produced when the coupled RF signal is rectified by the nonlinear behavior of the semiconductors used in the small-signal analog input stage of the electronic system. Circuits based on operational amplifiers are usually employed for such input stages. These circuits present an amplitude modulation demodulation produced by the nonlinearity of internal transistors. Such a phenomenon generates demodulated signals in the low-frequency range. In this paper, this effect is suppressed by combining the conventional printed circuit board layout with complementary split-ring resonators (CSRRs). CSRRs are constitutive elements for the synthesis of metamaterials with negative effective permittivity, which are mainly excited to the host line by means of electric coupling. Electromagnetic simulations and experimental results show an effective rejection of the undesired RF demodulation effect with no extra cost in terms of the device area or manufacturing process.

  • 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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  • EMI reduction by means of switching frequency modulation with variable delay in power supplies

     Mon Gonzalez, Juan; Gago Barrio, Javier; Gonzalez Diez, David; Balcells Sendra, Josep; Fernández García, Raúl; Gil Galí, Ignacio; Bogonez Franco, Francisco
    International journal of electronics
    Date of publication: 2012-01
    Journal article

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  • Estudio e implementación de nuevas técnicas de modulación para la reducción de perturbaciones EMI en convertidores matriciales  Open access

     Espina Masramon, Jorge
    Defense's date: 2012-11-07
    Department of Electronic Engineering, Universitat Politècnica de Catalunya
    Theses

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    El procesamiento de la energía mediante convertidores electrónicos conmutados ha tomado una relevancia notable durante la última década, y presumiblemente será uno de los campos de la ingeniería con mayor proyección industrial en el futuro. La evolución continua en el campo de la electrónica de potencia ha hecho posible la fabricación de convertidores conmutados cada vez más compactos, capaces de manejar valores de tensión y corriente mayores, conmutando a frecuencias más elevadas. Estas mejoras provocan, a su vez, la generación de perturbaciones electromagnéticas (EMI) fuera del rango permitido por la legislación vigente. Por otro lado, el diseño convertidores con nuevas topologías y una legislación cada vez más restrictiva en cuanto a emisiones EMI se refiere, hace imprescindible la elaboración de nuevas herramientas capaces de analizar los efectos que de las EMI generadas se puedan derivar. Uno de los convertidores de potencia emergentes y que actualmente está adquiriendo especial relevancia es el Convertidor Matricial (MC). El auge del interés por esta topología durante los últimos años ha sido motivado gracias a prestaciones como la conversión directa AC/AC, su gran densidad de potencia y la ausencia de grandes componentes reactivos para el almacenaje de energía. El trabajo que se presenta en este documento trata de dar cobertura al estudio y la reducción de las EMI generadas por los MC. Esta tesis doctoral se ha dividido en dos líneas de investigación: Estudio de las perturbaciones EMI producidas por los MC y prevención de efectos adversos producidos por dichas EMI. La primera línea de investigación ha tenido como objetivo principal el estudio de las EMIs generadas por los MC de topología directa. En dicho estudio se ha desarrollado un modelo EMI para poder predecir las perturbaciones conducidas generadas por dichos convertidores. Uno de los objetivos principales de dicho modelo es proporcionar aproximaciones suficientemente válidas en un tiempo reducido. La estrategia utilizada ha sido el cálculo de las perturbaciones conducidas clasificando estas en modo común (CM) y modo diferencial (DM). El método utilizado se basa en la extracción de circuitos de impedancias equivalentes que proporcionen una representación fidedigna de la generación y propagación de las perturbaciones sin necesidad de complejos sistemas de cálculo. La segunda línea de investigación ha tenido como objetivo reducir el número de descargas eléctricas que se producen en los cojinetes del motor, las cuales son una de las causas principales de la reducción de su vida útil. Estas descargas son debidas a los niveles de la tensión en modo común (CMV) y sus rápidas variaciones en el tiempo (dv/dt). Para reducir los niveles de la CMV se ha desarrollado una modulación basada en la tradicional Space Vector Modulation (SVM) donde se remplazan los vectores cero, utilizados convencionalmente, por vectores rotativos. Este intercambio de vectores ha demostrado que permite reducir de manera significativa la amplitud del CMV y con ello reducir la probabilidad en la aparición de descargas eléctricas en los cojinetes. Además, en el estudio se analiza la utilización de vectores activos de diferentes amplitudes con el objetivo de mejorar la modulación presentada cuando se utilizan índices de modulación pequeños.

    The energy processing using power converters has taken a remarkable importance in the last decade, and in the future it might become one of the engineering fields with greater projection. The continuous evolution in the field of power electronics has made possible to manufacture more compact switched converters, capable of managing higher voltage and currents levels switching at higher frequency. These improvements, however, lead to the generation of electromagnetic perturbations (EMI) which fail the electromagnetic regulations. On the other hand, the converter design using new layout topologies and a regulation law that is becoming more restrictive about EMI emissions makes essential to develop new tools capable to analyze the effects of the EMI generated. One of the emerging power converters which is currently acquiring special relevance is the matrix converter (MC). The rise of interest on this topology in recent years has been determined by different aspects, such as direct AC/AC conversion, its high power density and the absence of large reactive components for energy storage. The work presented in this document tries to cover the study and the reduction of EMI generated by the MC. This Phd thesis has divided in two research lines: The study of the EMI produced by MC and the prevention of the adverse effects produced by EMI. The first research line has mainly focused on the study of EMI generated by MC of direct topology. In this study, a model to predict the conducted EMI has been developed. One of the main objectives of this model is to deliver good approximation results in short time. The strategy used has been the conducted perturbation calculation using the classification of the EMI as common mode (CM) and differential mode (DM). The method used is based on extraction of the equivalent impedance circuit. This equivalent circuit provides a true representation of the generation and propagation of EMI without the need of complex mathematical methods. The second research line has mainly focused on the reduction of electric discharges which is produced inside of the motor bearings, which are the main cause of motor life time reduction. These electrical discharges are produced by the common mode voltage (CMV) levels and its fast time transitions (dv/dt). In order to reduce those levels, a new modulation based on the traditional Space Vector modulation (SVM) has been developed replacing the zero vectors, normally used, for the rotating ones. This vector exchange has shown a significant reduction of the CMV amplitude, and therefore the probability of electrical discharge appearing inside the motor drops considerably. Furthermore, the study analyzes the use of the active vectors with smaller amplitude to improve the modulation when small modulation index is used.

  • Contribución a técnicas de modelado y reducción de EMI en sistemas multiconvertidor  Open access

     Mon Gonzalez, Juan
    Defense's date: 2012-11-05
    Department of Electronic Engineering, Universitat Politècnica de Catalunya
    Theses

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    This Thesis has been developed in the research group TIEG (Terrassa Industrial Electronics Group). It is focused on the reduction of conducted electromagnetic interferences (EMI) generated by switched power converters. Particularly, it deals with multiphase buck converters. In such kind of systems interleaving is commonly and widely used because of advantages it reports. Among these advantages, it should be mentioned the reduction of the output voltage ripple and conducted disturbances as well. However, interleaving can be combined with other techniques in order to improve the electromagnetic compatibility (EMC) performance. These methods can be classified as filtering or suppression techniques. Filtering methods prevent interferences from propagating through mains, power lines, data lines, etc. Suppression methods directly suppress the noise source. The modulation of the switching pattern of the converter is one of such techniques. These suppression techniques are complementary to the conventional filtering techniques based in passive elements. The aim of this Thesis is to determine the optimum combination of both techniques (interleaving and modulation) in order to achieve the best attenuation of conducted disturbances. The influence of several modulation parameters on the attenuation will be investigated and the undesired side effects produced by these new techniques will be evaluated as well. In order to fulfil this goal, several modulation strategies were considered. Particularly, the switching frequency modulation (SFM), pulse position modulation (PPM) and pulse width modulation (PWM) have been investigated. Finally, three modulation techniques based on the frequency modulation of the switching pattern have been proposed. These techniques are the Constant Delay Tm with switching Frequency Modulation (CDFM-Tm), Constant Delay Tc with switching Frequency Modulation (CDFM-Tc) and Variable Delay with switching Frequency Modulation (VDFM). The experimental validation of these 3 techniques has been conducted on a 4 phases buck converter operated in hard switching regime.

    Esta tesis se ha desarrollado dentro de una de las líneas de investigación del Grupo de Electrónica Industrial de Terrassa (TIEG). Concretamente, se centra en el área de la reducción de las interferencias electromagnéticas conducidas (EMI), generadas por los convertidores de potencia. Dentro de este campo, se estudia el caso particular de los convertidores buck multifase. En este tipo de sistemas es común el uso de la técnica de interleaving que conlleva una serie de beneficios entre los que destaca la reducción del rizado de la tensión de salida y de las interferencias generadas. No obstante, es posible combinarla con otras técnicas para mejorar los resultados obtenidos desde el punto de vista de la compatibilidad electromagnética (EMC). En la actualidad existen diversos métodos para la reducción de las interferencias conducidas en convertidores de potencia que se pueden aplicar conjuntamente con la técnica de interleaving. Estos métodos se pueden clasificar como métodos de filtrado o supresión. Los primeros actúan evitando que las interferencias generadas se propaguen a través de las líneas de alimentación, datos, etc. Mientras que los segundos actúan directamente sobre las fuentes de ruido, reduciendo en origen las perturbaciones. Dentro de los métodos de supresión se encuentran las técnicas basadas en la modulación de la señal de control del convertidor. Estas técnicas de supresión son alternativas o complementarias a las técnicas de filtrado convencionales, basadas en elementos pasivos. El objetivo de la tesis es determinar la combinación óptima de estas dos técnicas (interleaving y modulación) en relación a la atenuación de las perturbaciones conducidas, cuantificando el efecto de diferentes parámetros de modulación sobre ésta. Por otro lado, también se desea evaluar los efectos no deseados producidos por estas nuevas técnicas. Para lograr este objetivo, se han evaluado diferentes estrategias de modulación que se pueden aplicar sobre la señal de control de los convertidores de potencia. En concreto, se han estudiado la modulación en frecuencia (SFM), la modulación de la posición del pulso (PPM) y la modulación por ancho de pulso (PWM). Por último, se han desarrollado tres técnicas de modulación basadas en la modulación en frecuencia de la señal de control, Constant Delay Tm with switching Frequency Modulation (CDFM-Tm), Constant Delay Tc with switching Frequency Modulation (CDFM-Tc) y Variable Delay with switching Frequency Modulation (VDFM). La validación experimental de las técnicas desarrolladas se ha llevado a cabo sobre un convertidor buck de 4 fases, operando en conmutación forzada.

  • CARACTERIZACION Y MEJORA COMPATIBILIDAD ELECTROMAGNETICA ENTRE CONVERTIDORES CONMUTADOS Y SISTEMAS DE COMUNICACION PLC

     Balcells Sendra, Josep; Gago Barrio, Javier; Lamich Arocas, Manuel; Mon Gonzalez, Juan; Perez Robles, Daniel; Gonzalez Diez, David
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  • Hybrid modulator for power converters in parallel topology

     Mon Gonzalez, Juan; Gonzalez Diez, David; Balcells Sendra, Josep; Gago Barrio, Javier; Bogonez Franco, Francisco
    International Power Electronics and Motion Control Conference
    Presentation's date: 2012-09-04
    Presentation of work at congresses

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  • EMI comparison between Si and SiC technology in a boost converter

     Bogonez Franco, Francisco; Balcells Sendra, Josep
    International Symposium on Electromagnetic Compatibility
    Presentation's date: 2012-09-18
    Presentation of work at congresses

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  • Validation of EMI model for matrix converters

     Espina Masramon, Jorge; Balcells Sendra, Josep; Arias Pujol, Antoni; Ortega García, Carlos; Gonzalez Diez, David; Gago Barrio, Javier
    International Symposium on Electromagnetic Compatibility
    Presentation's date: 2012-09-18
    Presentation of work at congresses

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    This paper is focused on the validation of a previously presented method to obtain conducted EMI in direct matrix converters (MC). Such model is based on a frequency domain equivalent circuit, which is applied to two different prototypes of MC in order to validate such method. This paper starts with a review of the EMI method and follows obtaining the equivalent circuit. The experimental part consists of a comparison between EMI simulation results and measured EMI in two different MC. Finally, the paper includes a discussion on the method generalisation.

  • Interleaving and switching pattern modulation to conducted EMI reduction

     Mon Gonzalez, Juan; Gonzalez Diez, David; Gago Barrio, Javier; Balcells Sendra, Josep; Bogonez Franco, Francisco
    Colloque International et Exposition sur la Compatibilité Electromagnétique
    Presentation's date: 2012-06-26
    Presentation of work at congresses

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    Hard-less common mode active EMI filter  Open access

     Perez Robles, Daniel; Gonzalez Diez, David; Mon Gonzalez, Juan; Balcells Sendra, Josep; Gil Galí, Ignacio; Gago Barrio, Javier; Bogonez Franco, Francisco
    Colloque International et Exposition sur la Compatibilité Electromagnétique
    Presentation's date: 2012-06-26
    Presentation of work at congresses

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    Active EMI filters appear as an alternative to classical EMI filters based on passive components. Active EMI filters can provide more compact, cheaper and lighter solutions than passive approach. In this paper we present a theoretical analysis of the 4 possible configurations. Expressions of the transfer function and insertion losses considering impedances of mains and source of noise are presented. The voltage-current topology is identified as the more convenient solution. Finally, preliminary experimental results of a prototype capable to provide attenuation up to 100MHz are shown.

  • Common mode EMI model for a direct matrix converter

     Espina Masramon, Jorge; Balcells Sendra, Josep; Arias Pujol, Antoni; Ortega, Carlos
    IEEE transactions on industrial electronics
    Date of publication: 2011-11
    Journal article

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    This paper presents an electromagnetic interference (EMI) model to evaluate the conducted common mode (CM) disturbances produced by matrix converters (MCs). The model is based on obtaining a high frequency (HF) equivalent circuit with HF sources representing the switching devices. The circuit resolution in the frequency domain allows the calculation of any EMI parameter with very low computational burden and avoids convergence problems, which are common in time domain methods. The original contribution lies in the source model implementation and placement. The simulation and experimental results for CM leakage currents validate the EMI model.

  • Analysis and characterization of coupled transmission lines loaded with complementary spiral resonators

     Gil Galí, Ignacio; Fernández García, Raúl; Balcells Sendra, Josep
    IET microwaves antennas and propagation
    Date of publication: 2011-02-21
    Journal article

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  • EMI modeling method of AC-AC power converters

     Espina Masramon, Jorge; Balcells Sendra, Josep; Arias Pujol, Antoni; Ortega, Carlos
    IEICE electronics express
    Date of publication: 2011-01-10
    Journal article

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  • Eficiencia en el Uso de la Energía Eléctrica

     Balcells Sendra, Josep; Autonell, Jordi; Barra, Vicente; Brossa, Joan; Fornieles, Francesc; Garcia, Bernat; Ros, Joan; Serra, Jordi
    Date of publication: 2011-01
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  • Q-00009

     Balcells Sendra, Josep
    Participation in a competitive project

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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.

  • IEEE transactions on industrial electronics (1963)

     Balcells Sendra, Josep
    Collaboration in journals

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  • Common mode model of matrix converter

     Espina Masramon, Jorge; Balcells Sendra, Josep; Ortega Garcia, Carlos; Arias Pujol, Antoni; de Lillo, Liliana; Empringham, Lee
    Compatibilty and Power Electronics
    Presentation's date: 2011-06-01
    Presentation of work at congresses

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    This paper deals with the validation of an EMI model to predict electromagnetic interferences (EMI) produced by direct AC/AC matrix converters (MC). The method is based on obtaining a high frequency equivalent circuit, using a combined time and frequency domain approach based on: “EMI source identification→ propagation path impedance→ derived disturbance”. The advantages of the proposed procedure are the computational time reduction and the lack of convergence problems, which may arise when using pure time domain procedures. The paper is focused on the prediction of common mode (CM) EMI of a matrix converter. The simulation results of this case will permit the calculation of currents which leak through the ground connections.

  • SVC model for voltage control of a microgrid

     Bogonez Franco, Francisco; Balcells Sendra, Josep; Junyent, Oriol; Jordà, Josep
    IEEE International Symposium on Industrial Electronics
    Presentation's date: 2011-06-28
    Presentation of work at congresses

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    Low power renewable sources, connected to low voltage micro-grids, are becoming more and more common. Since there is a high degree of uncertainty on the availability of such sources, this causes problems of stability and makes difficult to guarantee the power quality (PQ) in all the points of the grid. Such kind of problems, are well known in medium voltage (MV) networks, where the proposed solutions to fix the stability and PQ problems are based on the control of reactive power flow in the grid. The equipment to perform such control function ranges from the simple capacitor banks driven by electro-mechanical contactors, through the Static Var Compensators (SVC) based on the combination of Thyristor Switched Capacitors (TSC) and Thyristor Controlled Reactors (TCR) or SVC combined with Active Power Filters (APF). This paper describes the design and implementation of a low power SVC prototype model, sizeable to higher power levels. It has been designed to compensate variations of the line voltage of a microgrid in a range of ±2%. The prototype can compensate 3kVAr capacitive and 1 kVAr inductive and is able to operate in a grid with a rated voltage of 400 V, phase to phase.

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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.

  • Immunity of power line communications (PLC) in disturbed networks

     Vallbe, Bernat; Balcells Sendra, Josep; Bogonez Franco, Francisco; Mata Diaz, Jorge; Gago Barrio, Javier
    IEEE International Symposium on Industrial Electronics
    Presentation's date: 2011-06-28
    Presentation of work at congresses

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  • Review of anti-windup strategies for PI speed controllers in field oriented control of permanent magnet synchronous machines

     Espina Masramon, Jorge; Arias Pujol, Antoni; Balcells Sendra, Josep; Ortega García, Carlos
    Przeglad elektrotechniczny
    Date of publication: 2010-10
    Journal article

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    The work presented in this paper addresses the unwanted windup phenomenon reviewing and comparing different PI anti-windup strategies employed in speed control of electric drives. The tuning process of PI controllers is usually carried out considering the system as linear and therefore disregarding its physical limits such as maximum current and voltage. To safeguard the system’s integrity, the PI output is normally limited eventually causing the windup phenomenon characterized by long periods of overshoots which may even result in instability. Firstly, this paper models and tunes the current and speed PI controllers with the root locus method for Field Oriented Control of a Permanent Magnet Synchronous Machines. Secondly, it is shown the mentioned unwanted Windup phenomenon in the speed loop. Finally, the Anti-Windup strategies are simulated and their behavior are compared when driving a Permanent Magnet Synchronous Machine with Field Oriented Control. Finally, some experimental results obtained from a PMSM Matrix Converter-fed set up have been carried out. These results corroborate the mathematical study and simulations presented all over this paper.

  • Improved Waveform Quality in the Direct Torque Control of Matrix-Converter-Fed PMSM Drives

     Ortega, Carlos; Arias Pujol, Antoni; Caruana, Cedric; Balcells Sendra, Josep; Asher, Greg J.
    IEEE transactions on industrial electronics
    Date of publication: 2010-06
    Journal article

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    Multiband EMI filter based on metamaterials  Open access

     Gil Galí, Ignacio; Fernández García, Raúl; Gago Barrio, Javier; Balcells Sendra, Josep
    IEICE electronics express
    Date of publication: 2010-05-10
    Journal article

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    A novel compact multiband microstrip EMI filter based on metamaterials is presented. The filter is implemented by means of split-rings resonators and complementary spiral sub-wavelength resonators, conveniently coupled to the victim transmission line. The suitable combination of these resonators allows us to design several stop-band frequency responses located at 900MHz (RFID UHF), 1.8GHz (GSM) and 2.4GHz (ISM) with a significant rejection level. A 3-stages/5-stages rejection band filter has been designed and fabricated in a PCB. The experimental results show a significant rejection level in agreement with the electromagnetic simulations.

  • Space Vector Modulation strategy to reduce the Common Mode perturbations in Matrix Converters

     Espina Masramon, Jorge; Ortega Garcia, Carlos; Arias Pujol, Antoni; Balcells Sendra, Josep
    IEICE electronics express
    Date of publication: 2010-02-25
    Journal article

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  • EMI Reduction in Parallel Multiconverter Topology Using Interleaving and Frequency Modulation Techniques

     Mon Gonzalez, Juan; Gago Barrio, Javier; Gonzalez Diez, David; Balcells Sendra, Josep; Fernández García, Raúl; Gil Galí, Ignacio; Bogonez Franco, Francisco
    Przeglad elektrotechniczny
    Date of publication: 2010-10
    Journal article

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  • Modeling conducted EMI of matrix converters

     Espina Masramon, Jorge; Balcells Sendra, Josep; Arias Pujol, Antoni; Berbel Artal, Nestor; Ortega Garcia, Carlos
    European Symposium on Electromagnetic Compatibility
    Presentation's date: 2010-09-13
    Presentation of work at congresses

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    Impact of plug-in electric vehicles on the supply grid  Open access

     Balcells Sendra, Josep; García, Josep
    IEEE Vehicle Power and Propulsion Conference
    Presentation's date: 2010-09-01
    Presentation of work at congresses

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    This paper presents a case study describing the impact of charging process of plug in hybrid vehicles (PHEV) and all electrical vehicles (EV) on the supply grid. The paper shows the distortion produced in the grid by the simultaneous charge of a large fleet of vehicles and the corrective actions taken to guarantee the Electromagnetic Compatibility with other loads in the same grid. The goal of the investigation was to establish a design guide for parking facilities.

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    EMI model of an AC/AC power converter  Open access

     Espina Masramon, Jorge; Balcells Sendra, Josep; Arias Pujol, Antoni; Ortega, Carlos; Berbel Artal, Nestor
    IEEE Vehicle Power and Propulsion Conference
    Presentation's date: 2010
    Presentation of work at congresses

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    This paper deals with the validation of an EMI model to predict electromagnetic interferences (EMI) produced by power converters. A direct AC to AC matrix converter (MC) has been selected as experimental setup for the paper, but the modeling method can be applied to other converter topologies. The method is based on obtaining a high frequency equivalent circuit, using a combined time and frequency domain approach based on: “EMI source identification→ propagation path impedance→ derived disturbance”. The advantages of the proposed procedure are the computational time reduction and the lack of convergence problems, which may arise when using pure time domain procedures. The paper is focused on the prediction of common mode (CM) EMI of a matrix converter. The simulation results of this case will permit the calculation of currents which leak through the ground connections. Two different EMI sources are compared: one based on PWM waveforms obtained from MATLAB® model and a second one where these data are obtained experimentally from a MC prototype. This procedure allows the comparison of EMI spectra when using simulated waveforms or real source waveforms.

  • Minimization of Leading Current in a Three Phase Four Wires Shunt Hybrid Filter

     Lamich Arocas, Manuel; Balcells Sendra, Josep; Gago Barrio, Javier; Gonzalez Diez, David; Jaen Fernandez, Carlos; Castillo Martínez, Jose Luis
    Przeglad elektrotechniczny
    Date of publication: 2009
    Journal article

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    The main drawback of Shunt Hybrid Filters is the need of leading current injection. This paper describes a strategy to reduce the leading current in a three phase four wires LC coupled parallel hybrid filter for harmonics cancellation. Simulation and experimental results are given to show the behaviour of the system.

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    Modulation technique to reduce EMI in power multiconverters  Open access

     Mon Gonzalez, Juan; Gago Barrio, Javier; Gonzalez Diez, David; Balcells Sendra, Josep; Fernández García, Raúl; Bogonez Franco, Francisco; Gil Galí, Ignacio
    IEICE electronics express
    Date of publication: 2009-04-05
    Journal article

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    A new technique to reduce EMI in modular power multiconverters is described. The technique is based on a combination of switching frequency modulation and a variable delay between communication signals of the single converters. The proposed technique has been validated experimentally in a four converters parallel topology. A significant EMI reduction has been obtained with regard to conventional techniques.

  • Advanced Wide Band Gap Semiconductor Devices for Rational Use of Energy (RUE)

     Mon Gonzalez, Juan; Bogonez Franco, Francisco; Gonzalez Diez, David; Gago Barrio, Javier; Balcells Sendra, Josep
    Participation in a competitive project

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  • Contribution to conducted EMI reduction in multiconverter topology

     Mon Gonzalez, Juan; Gonzalez Diez, David; Gago Barrio, Javier; Balcells Sendra, Josep; Fernández García, Raúl; Gil Galí, Ignacio
    Annual Conference of the IEEE Industrial Electronics Society
    Presentation's date: 2009-11
    Presentation of work at congresses

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  • A new switching frequency modulation scheme for EMI reduction in multiconverter topology

     Mon Gonzalez, Juan; Gago Barrio, Javier; Gonzalez Diez, David; Balcells Sendra, Josep; Fernández García, Raúl; Gil Galí, Ignacio
    European Conference on Power Electronics and Applications
    Presentation's date: 2009-09
    Presentation of work at congresses

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  • Lead Current Reduction in a Three Phase Four Wires Shunt Hybrid Filter

     Lamich Arocas, Manuel; Balcells Sendra, Josep; Castillo Martínez, Jose Luis; Perez Robles, Daniel
    European Conference on Power Electronics and Applications
    Presentation's date: 2009
    Presentation of work at congresses

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    Speed anti-windup PI strategies review for field oriented control of permanent magnet synchronous machines servo drives with matrix converters  Open access

     Espina Masramon, Jorge; Arias Pujol, Antoni; Balcells Sendra, Josep; Ortega García, Carlos; Galceran Arellano, Samuel
    European Conference on Power Electronics and Applications
    Presentation's date: 2009
    Presentation of work at congresses

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    When facing real systems PI tuning, the plant is modeled disregarding its physical limitations. Consequently, the PI output may increase indefinitely its value; phenomenon called Windup. This paper presents a review and a comparison between different Anti-Windup PI strategies used in speed motion and position control for Matrix Converter PMSM servo drives.

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    Reduction of EMI by Combining Interleaving and Modulation Techniques in Multiconverter Topology  Open access

     Mon Gonzalez, Juan; Gago Barrio, Javier; Gonzalez Diez, David; Balcells Sendra, Josep; Fernández García, Raúl; Gil Galí, Ignacio
    Compatibility and Power Electronics
    Presentation of work at congresses

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    In this paper an evaluation of different modulations techniques that combine switching frequency modulation and interleaving is presented. The objective of these modulations is to cancel certain harmonics of EMI and to reduce the amplitude of the remaining harmonics. A four channel parallel buck converter has been used in order to evaluate the modulations proposed. According experimental results, significant reduction of EMI is possible by combining both techniques instead of using them separately.

  • Técnicas de reducción EMI en sistemas multiconvertidor con conexión en paralelo

     Mon Gonzalez, Juan; Gago Barrio, Javier; Gonzalez Diez, David; Balcells Sendra, Josep
    Jornades de Conferències d'Enginyeria Electrònica
    Presentation of work at congresses

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    Speed anti-windup PI strategies review field oriented control of permanent magnet synchronous machines  Open access

     Espina Masramon, Jorge; Arias Pujol, Antoni; Balcells Sendra, Josep; Ortega García, Carlos
    International Conference-Workshop on Compatibility and Power Electronics
    Presentation's date: 2009-05
    Presentation of work at congresses

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    The work presented in this paper addresses the unwanted windup phenomenon reviewing and comparing different PI anti-windup strategies employed in speed control of electric drives. The tuning process of PI controllers is usually carried out considering the system as linear and therefore disregarding its physical limits such as maximum current and voltage. To safeguard the system’s integrity, the PI output is normally limited eventually causing the windup phenomenon characterized by long periods of overshoots which may even result in instability. Firstly, this paper models and tunes the current and speed PI controllers with the root locus method for Field Oriented Control of a Permanent Magnet Synchronous Machines. Secondly, it is shown the mentioned unwanted Windup phenomenon in the speed loop. Finally, the Anti-Windup strategies are simulated and their behavior are compared when driving a Permanent Magnet Synchronous Machine with Field Oriented Control. Finally, some experimental results obtained from a PMSM Matrix Converter-fed set up have been carried out. These results corroborate the mathematical study and simulations presented all over this paper.

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    Common mode output waveform reduction for matrix converter drives  Open access

     Espina Masramon, Jorge; Arias Pujol, Antoni; Balcells Sendra, Josep; Ortega García, Carlos
    IEEE International Conference on Industrial Electronics
    Presentation's date: 2009-11
    Presentation of work at congresses

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    This paper presents an alternative Space Vector Modulation (SVM) implemented in Matrix Converters (MC) which improves and reduces the Common Mode (CM) voltage and current output waveforms. The strategy is based on replacing the MC zero vectors for the rotating ones, which reduces the CM voltage derivative and therefore the leakage CM current. By reducing this CM current, which might flow inside the motor through the bearings and windings, the Permanent Magnet Synchronous Machine (PMSM) deterioration might be slowed down. The paper describes the novel SVM pattern and analyses the CM voltage and its leakage current. Simulation results based on PMSM drive are provided to corroborate the whole idea.

  • Registro de la Calidad de Red: ¿Cómo compactar datos?

     Balcells Sendra, Josep
    Date of publication: 2008-10
    Book chapter

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  • Exploration of Application of Continuous Wavelet Transform to Power Quality Analysis

     Gonzalez Diez, David; Balcells Sendra, Josep; Bialasiewicz, J T
    14th International Symposium on Industrial Electronics
    Presentation of work at congresses

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  • Angle estimation for Sensorless Field Oriented Control with Matrix Converters and Surface Mount Permanent Magnet Synchronous Machines

     Arias Pujol, Antoni; Ortega, C; Pou Felix, Josep; Gonzalez Diez, David; Balcells Sendra, Josep
    39th IEEE Power Electronics Specialists Conference. PESC 2008
    Presentation of work at congresses

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  • Plataforma de prácticas para electrónica de potencia

     Daniel, Pérez Robles; Lamich Arocas, Manuel; Balcells Sendra, Josep; Berbel Artal, Nestor; Mon Gonzalez, Juan; Zaragoza Bertomeu, Jordi
    Seminario Anual de Automática, Electrónica Industrial e Instrumentación
    Presentation of work at congresses

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  • Combined application of interleaving and modulation techniques in multiconverter topology

     Mon Gonzalez, Juan; Gonzalez Diez, David; Gago Barrio, Javier; Balcells Sendra, Josep
    IEEE International Conference on Electronics, Circuits and Systems
    Presentation of work at congresses

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  • Control of a Three Phase Four Wires Shunt Hybrid Filter

     Lamich, M; Balcells Sendra, Josep; Gonzalez Diez, David; Gago Barrio, Javier
    14th International Symposium on Industrial Electronics
    Presentation of work at congresses

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