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  • Voltage support control strategies for static synchronous compensators under unbalanced voltage sags

     Castilla Fernandez, Miguel; Miret Tomas, Jaume; Camacho Santiago, Antonio; Matas Alcala, Jose; Garcia de Vicuña Muñoz de la Nava, Jose Luis
    IEEE transactions on industrial electronics
    Date of publication: 2014
    Journal article

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    Static synchronous compensators have been broadly employed for the provision of electrical ac network services, which include voltage regulation, network balance, and stability improvement. Several studies of such compensators have also been conducted to improve the ac network operation during unbalanced voltage sags. This paper presents a complete control scheme intended for synchronous compensators operating under these abnormal network conditions. In particular, this control scheme introduces two contributions: a novel reactive current reference generator and a new voltage support control loop. The current reference generator has as a main feature the capacity to supply the required reactive current even when the voltage drops in amplitude during the voltage sag. Thus, a safe system operation is easily guaranteed by fixing the limit required current to the maximum rated current. The voltage control loop is able to implement several control strategies by setting two voltage set points. In this paper, three voltage support control strategies are proposed, and their advantages and limitations are discussed in detail. The two theoretical contributions of this paper have been validated by experimental results. Certainly, the topic of voltage support is open for further research, and the control scheme proposed in this paper can be viewed as an interesting configuration to devise other control strategies in future works.

    Static synchronous compensators have been broadly employed for the provision of electrical ac network services, which include voltage regulation, network balance, and stability improvement. Several studies of such compensators have also been conducted to improve the ac network operation during unbal- anced voltage sags. This paper presents a complete control scheme intended for synchronous compensators operating under these abnormal network conditions. In particular, this control scheme introduces two contributions: a novel reactive current reference generator and a new voltage support control loop. The current reference generator has as a main feature the capacity to supply the required reactive current even when the voltage drops in amplitude during the voltage sag. Thus, a safe system operation is easily guaranteed by fixing the limit required current to the maximum rated current. The voltage control loop is able to imple- ment several control strategies by setting two voltage set points. In this paper, three voltage support control strategies are proposed, and their advantages and limitations are discussed in detail. The two theoretical contributions of this paper have been validated by experimental results. Certainly, the topic of voltage support is open for further research, and the control scheme proposed in this paper can be viewed as an interesting configuration to devise other control strategies in future works.

  • Control scheme with voltage support capability for distributed generation inverters under voltage sags

     Miret Tomas, Jaume; Camacho Santiago, Antonio; Castilla Fernandez, Miguel; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Matas Alcala, Jose
    IEEE transactions on power electronics
    Date of publication: 2013-05
    Journal article

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    Voltage sags are one of the main problems in transmission and distribution grids with high penetration of distributed generation. This paper proposes a voltage support control scheme for grid-connected power sources under voltage sags. The control is based on the injection of reactive current with a variable ratio between positive and negative sequences. The controller determines, also, the amount of reactive power needed to restore the dropped voltage magnitudes to new reference values confined within the continuous operation limits required in grid codes. These reference values are chosen in order to guarantee low current injection when fulfilling the voltage support objective. Selected experimental results are reported in order to validate the effectiveness of the proposed control.

  • An adaptive prefiltering method to improve the speed/accuracy tradeoff of voltage sequence detection methods under adverse grid conditions

     Matas Alcala, Jose; Castilla Fernandez, Miguel; Miret Tomas, Jaume; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Guzman Sola, Ramon
    IEEE transactions on industrial electronics
    Date of publication: 2013-07-23
    Journal article

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    This paper deals with the improvement of the transient response and harmonic, subharmonic, and dc-offset voltage rejection capability of a grid voltage sequence detection scheme based on a second-order generalized integrator (SOGI). To perform that, the SOGI structure is first analyzed in deep, emphasizing both its tradeoff limits between settling time and harmonic attenuation and the sensitivity to grid subharmonics and dc-offset voltage. Then, a study of the effect of grid voltage harmonics and subharmonics in SOGI and in the SOGI-FLL and MSOGI-FLL structures is introduced. Hence, to overcome these problems, a new structure based on the use of the SOGI filter as prefilter for the previous structures is proposed to achieve a faster time response and higher harmonic rejection. This structure is used in a sequence detection scheme for the detection of the grid voltage components in the aß-frame and it is applied in a three-phase PV system. Experimental and comparative results are shown to validate this proposal

    This paper deals with the improvement of the transient response and harmonic, subharmonic, and dc-offset voltage rejection capability of a grid voltage sequence detection scheme based on a second-order generalized integrator (SOGI). To perform that, the SOGI structure is first analyzed in deep, emphasizing both its tradeoff limits between settling time and harmonic attenuation and the sensitivity to grid subharmonics and dc-offset voltage. Then, a study of the effect of grid voltage harmonics and subharmonics in SOGI and in the SOGI-FLL and MSOGI-FLL structures is introduced. Hence, to overcome these problems, a new structure based on the use of the SOGI filter as prefilter for the previous structures is proposed to achieve a faster time response and higher harmonic rejection. This structure is used in a sequence detection scheme for the detection of the grid voltage components in the αβ-frame and it is applied in a three-phase PV system. Experimental and comparative results are shown to validate this proposal.

  • Control design for multiphase synchronous buck converters based on exact constant resistive output impedance

     Borrell Sanz, Angel; Castilla Fernandez, Miguel; Miret Tomas, Jaume; Matas Alcala, Jose; Garcia de Vicuña Muñoz de la Nava, Jose Luis
    IEEE transactions on industrial electronics
    Date of publication: 2013-11
    Journal article

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    This paper describes a control design methodology based on output impedance analysis for multiphase synchronous buck converters. This design leads to an optimal output voltage transient response. Two design alternatives are proposed. The first alternative uses an equivalent single-phase converter to design the control parameters. This approximation is valid as long as the deviations between the phases of the converter are within the usual tolerance limits. The second one achieves exact constant resistive output impedance regardless of the differences that exist between the phases. Simulation and experimental results are reported in order to validate the two design approaches.

    This paper describes a control design methodology based on output impedance analysis for multiphase synchronous buck converters. This design leads to an optimal output voltage transient response. Two design alternatives are proposed. The first alternative uses an equivalent single-phase converter to design the control parameters. This approximation is valid as long as the deviations between the phases of the converter are within the usual tolerance limits. The second one achieves exact constant resistive output impedance regardless of the differences that exist between the phases. Simulation and experimental results are reported in order to validate the two design approaches.

  • Active damping control for a three phase grid-connected inverter using sliding mode control

     Guzman Sola, Ramon; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Camacho Santiago, Antonio; Matas Alcala, Jose; Castilla Fernandez, Miguel; Miret Tomas, Jaume
    Annual Conference of the IEEE Industrial Electronics Society
    Presentation's date: 2013-11-12
    Presentation of work at congresses

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    This paper proposes a new active damping method based on virtual resistors for three-phase grid connected voltage source inverters (VSI) with LCL filter. The use of this filters is a standard solution to provide the proper attenuation to the sideband voltage harmonics of the modulation signal. However these grid filters can introduce an unstable dynamics if a passive or active damping is not properly introduced. The passive damping solution causes a decrease of the overall efficiency due to the associated losses and reduces the filter effectiveness but in contrast no more extra sensors are needed. Active damping methods are more efficient because they don't introduce losses but suffers from control and system complexity because in some cases a high number of sensors are needed. The proposed strategy employs a nonlinear sliding mode control (SMC) scheme in natural frame in combination with a Kalman filter to emulate a resistor in the LCL filter which damps the system actively without the use of extra sensors. Two current controllers are designed in order to control the active and reactive power independently and a voltage controller is designed to control the neutral point which is fixed with a third harmonic voltage in order to increase the control dynamic range.

  • Control strategies based on effective power factor for distributed generation power plants during unbalanced grid voltage

     Camacho Santiago, Antonio; Castilla Fernandez, Miguel; Miret Tomas, Jaume; Matas Alcala, Jose; Guzman Sola, Ramon; de Sousa Pérez, Óscar; Marti Colom, Pau; Garcia de Vicuña Muñoz de la Nava, Jose Luis
    Annual Conference of the IEEE Industrial Electronics Society
    Presentation's date: 2013-11-13
    Presentation of work at congresses

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    Unbalanced voltages in three-phase power systems is a common perturbation propagated along the grid. Distributed Generation plants have gained widespread attention due to their capability to improve power quality in a distributed manner, including voltage unbalance mitigation. A conventional control strategy to command power plants during balanced grid voltages, is the use of power factor to inject/absorb reactive power depending on grid conditions. Advanced control strategies during unbalanced grid voltages can be selected prioritizing positive or negative sequence active and reactive power. This selection determines the voltage support service and therefore can improve the voltage profile, i.e. phase-voltages can be properly supported and voltage imbalance simultaneously corrected. Based on the definition of effective power factor in IEEE 1459 Standard, the reactive power needed for any control strategy is obtained and the resulting effects are described.

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    Reduction of Current Harmonic Distortion in Three-Phase Grid-Connected Photovoltaic Inverters via Resonant Current Control  Open access

     Castilla Fernandez, Miguel; Miret Tomas, Jaume; Camacho Santiago, Antonio; Matas Alcala, Jose; Garcia de Vicuña Muñoz de la Nava, Jose Luis
    IEEE transactions on industrial electronics
    Date of publication: 2013-04
    Journal article

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    The resonant current control has been extensively employed to reduce the current harmonic distortion in a wide range of grid-connected distributed generation applications, including photovoltaic (PV) inverters, wind and water turbines, and fuel-cell inverters. However, the performance of these systems is deteriorated when the utility grid voltage experiences abnormal conditions such as voltage harmonics and imbalances. Several advanced control solutions have been recently introduced to cope with this problem but at the cost of a signi¿cant increase in the control computational load. This paper ¿rst analyzes the limitations of the standard resonant current control operating under abnormal grid conditions and then introduces a control scheme that improves the current harmonic distortion in such adverse conditions without increasing the computational load of the standard current control. This theoretical contribution is validated by means of selected experimental results from a three-phase PV inverter.

    The resonant current control has been extensively employed to reduce the current harmonic distortion in a wide range of grid-connected distributed generation applications, including photovoltaic (PV) inverters, wind and water turbines, and fuel-cell inverters. However, the performance of these systems is deteriorated when the utility grid voltage experiences abnormal conditions such as voltage harmonics and imbalances. Several advanced control solutions have been recently introduced to cope with this problem but at the cost of a significant increase in the control computational load. This paper first analyzes the limitations of the standard resonant current control operating under abnormal grid conditions and then introduces a control scheme that improves the current harmonic distortion in such adverse conditions without increasing the computational load of the standard current control. This theoretical contribution is validated by means of selected experimental results from a three-phase PV inverter

  • CONTROL COOPERATIVO PARA LA GESTION OPTIMA DE LA ENERGIA EN MICRORREDES ELECTRICAS

     Garcia de Vicuña Muñoz de la Nava, Jose Luis; Matas Alcala, Jose; Guerrero Zapata, Josep Maria; Miret Tomas, Jaume; Font Mateu, Josep; Cruz Vaquer, Juan; Guzman Sola, Ramon; Camacho Santiago, Antonio; Ortega García, Carlos; Borrell Sanz, Angel; pellitero rodriguez, carlos; Castilla Fernandez, Miguel
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  • Coordinated reactive power control for static synchronous compensators under unbalanced voltage sags

     Castilla Fernandez, Miguel; Miret Tomas, Jaume; Camacho Santiago, Antonio; Matas Alcala, Jose; Alarcon Gallo, Eduardo; Garcia de Vicuña Muñoz de la Nava, Jose Luis
    IEEE International Symposium on Industrial Electronics
    Presentation's date: 2012
    Presentation of work at congresses

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    Unbalanced voltage sags strongly deteriorate the performance of power converters and electrical machines connected to the distribution network. In particular, a reduction of the power quality is noticed in these equipments, which is caused by a ripple in the output power and an increase of the current harmonic distortion. Several solutions based on reactive power compensation have been introduced to cope with this problem. Among them, static synchronous compensators have confirmed the superior performance due to the possibility of using all rated power exclusively to voltage support. This paper presents a simple reactive power control algorithm for static synchronous compensators operating under unbalanced voltage sags. The main feature of the proposed algorithm is that it allows a fine adjustment of the amount of reactive power injected by the positive- and negative-sequence components. Thus the control algorithm provides voltage support at the output of the static synchronous compensator. Specifically the proposed control conveniently corrects both the positive- and negative-sequence voltage. Selected simulation results are provided to validate the proposal.

  • Reactive power control for voltage support during type C voltage-sags

     Camacho Santiago, Antonio; Castilla Fernandez, Miguel; Miret Tomas, Jaume; Matas Alcala, Jose; Alarcon Cot, Eduardo Jose; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Marti Colom, Pau
    Annual Conference of the IEEE Industrial Electronics Society
    Presentation's date: 2012-10-27
    Presentation of work at congresses

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  • Fast grid synchronization technique based on a multiple cascaded general integrator scheme for distributed generation inverters

     Matas Alcala, Jose; Castilla Fernandez, Miguel; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Miret Tomas, Jaume; Alarcon Gallo, Eduardo; Camacho Santiago, Antonio
    IEEE International Symposium on Industrial Electronics
    Presentation's date: 2012
    Presentation of work at congresses

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    This paper proposes a new structure for grid synchronization based on generalized integrators (GI) that lead to fast detection of positive and negative components of the grid voltage. The GI are used as a band pass filter (GI-BPF) mainly to provide in-phase and quadrature components of grid voltage. The proposed structure consists in the cascaded connection of multiple GI-BPF to achieve a faster time response than a single GI-BPF but with the same bandwidth characteristics. This structure is used with a frequency locked loop and a positive sequence detector to operate under unbalanced voltage sags. Simulations and experimental results of a photovoltaic power system injecting power to the grid in the stationary reference frame are shown to validate this proposal. Comparisons between this proposal and one that uses a single GI-BPF in the sequence detector are provided. The results show that the proposed cascaded GI-BPF achieves a considerably time response reduction in the sequence grid detection under a fault with the same quality-filter characteristics.

  • Decoupled sliding mode control for three-phase LCL VSI operating at fixed switching frequency

     Alarcon Gallo, Eduardo; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Castilla Fernandez, Miguel; Miret Tomas, Jaume; Matas Alcala, Jose; Camacho Santiago, Antonio
    IEEE International Symposium on Industrial Electronics
    Presentation's date: 2012
    Presentation of work at congresses

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  • CONTROLADOR DE HISTÉRESIS DE BAJO COSTE PARA CONVERTIDOR BUCK SÍNCRONO MULTIFASE  Open access

     Borrell Sanz, Ángel
    Defense's date: 2012-07-12
    Department of Electronic Engineering, Universitat Politècnica de Catalunya
    Theses

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    The multiphase synchronous buck converter is universally used today for powering low voltage, high current and high slew-rate loads, such as CPUs and other high performance digital ICs. This converter demands control techniques with high dynamical response in order to face large and fast load transients. In this regard, hysteretic regulators represent an excellent option due to their immediate reaction, unlimited duty cycle and outstanding capacity for handling large signal regimes. The main contributions of much published work in the field of multiphase hysteretic controllers are current sharing and phase interleaving. However, the author is not aware of any studies describing a control scheme that integrates the main control functions for powering such demanding loads: output voltage regulation, adaptive voltage positioning, current sharing and phase interleaving. Nor is there a design methodology based on the closed-loop output impedance. This design would optimize the output voltage transient response and, in this way, the entire voltage tolerance window of the processor would be exploited. Thus, this research work presents a novel hysteretic controller for a multi-phase synchronous buck converter supplying low voltage, high current and high slew-rate loads along with a design methodology based on closed-loop output impedance analysis. The single-phase hysteretic controller is the start point for this research work. Several authors have extensively treated the single-phase hysteretic controller. In this regard, a review of a low-cost single-phase control scheme is carried out first. The main feature of this controller is the lack of current sensing and processing circuitry in order to accomplish the adaptive voltage regulation. Then, the influence of variations of the inductor and output capacitor and the control parameters on the output impedance is studied. This has allowed for establishing a correspondence between each of the control parameters and the output filter components. The review finishes by implementing a synchronization system to achieve fixed switching frequency in steady state while maintaining the instantaneous reaction and optimal output-voltage response during transients. At this point, a novel low-cost hysteretic controller for multiphase synchronous buck converters is presented. Two design alternatives for the controller are proposed. The first uses an equivalent single-phase converter to design the control parameters. This approximation is valid as long as the deviations between the phases of the converter are within the usual limits (+/- 15 %). The second does the same considering the exact model of the converter, achieving resistive output impedance regardless of the differences that exist between the phases. Simulation and experimental results are reported in order to validate the features of the novel control scheme. From a practical point of view, the lack of current sensing and processing circuitry in the controller allow for a simple and low-cost implementation of the adaptive voltage positioning and current sharing with outstanding performance. The injection of an external synchronization signal has been proved to be a simple alternative in order to implement fixed switching frequency and phase interleaving operation. Finally, the proposed controller achieves similar characteristics to the high performance controllers intended for powering low voltage, high current and fast transient loads, but with the additional advantage of simplicity and low-cost circuit implementation.

    Actualmente, el convertidor buck síncrono multifase es universalmente utilizado para la alimentación de cargas dinámicas de baja tensión y elevada corriente como CPUs y otros circuitos integrados digitales de altas prestaciones. Este convertidor exige de técnicas de control con alta respuesta dinámica para hacer frente a los grandes y rápidos transitorios de carga a los que es sometido. A este respecto, los reguladores de histéresis representan una excelente opción debido a su reacción inmediata, ciclo de trabajo ilimitado y excepcional capacidad para manejar régimen de gran señal. Las principales aportaciones de la mayor parte de trabajos publicados en el campo de los controladores de histéresis multifase son distribución de corriente entre las fases y funcionamiento entrelazado. Sin embargo, el autor no tiene conocimiento de estudios que describan un esquema de control que integre las principales funciones de control para la alimentación de tales exigentes cargas: regulación de tensión de salida con posicionamiento adaptativo, distribución de corriente y funcionamiento entrelazado. Tampoco existe una metodología de diseño basada en la impedancia de salida de lazo cerrado. Este diseño optimiza la respuesta transitoria de la tensión de salida y, de este modo, se puede aprovechar toda la ventana de tolerancia del procesador. Por lo tanto, este trabajo de investigación presenta un novedoso controlador de histéresis para convertidor síncrono multifase destinado a alimentar cargas dinámicas de baja tensión y alta corriente, junto con una metodología de diseño basada en el análisis de la impedancia de salida de lazo cerrado. El controlador de la histéresis de una sola fase es el punto de partida de este trabajo de investigación. Varios autores han tratado ampliamente el controlador de histéresis de una sola fase. En este sentido, en primer lugar se lleva a cabo una revisión de un esquema de control de bajo coste de una sola fase. La característica principal de este controlador es la ausencia de circuitos de sensado y procesado de corriente para lograr la regulación de tensión adaptativa. El estudio de la influencia de las variaciones del inductor, condensador de salida y los parámetros de control y los componentes del filtro de salida. La revisión termina implementando un sistema de sincronización para lograr frecuencia fija de comunicación en estado estacionario, que mantiene la reacción instantánea y la respuesta transitoria óptima de la tensión de salida. Llegado a este punto, se presenta un controlador de histéresis de bajo coste para convertidores buck síncrono multifase. Se proponen dos alternativas de diseño para controlador. La primer a utiliza un equivalente de convertidor de una sola fase para diseñar los parámetros de control. Esta aproximación es válida siempre y cuando las desviaciones entre las fases del convertidor están dentro de los límites habituales (+/-15%). La segunda hace lo propio teniendo en cuenta el modelo exacto del convertidor, logrando impedancia de salida resistiva independientemente de las diferencias que existan entre las fases. Se presentan los resultados de simulación y experimentales con el fin de validar las características del esquema de control propuesto. Desde un punto de vista práctico, la ausencia de circuitos de sensado y procesado de corriente en el controlador permiten una implementación sencilla y de bajo coste para las funciones de regulación de tensión con posicionamiento adaptativo de reparto de corriente con buen rendimiento. La inyección de una señal de sincronización externa demuestra ser una alternativa simple a fin de obtener frecuencia fija de conmutación y funcionamiento entrelazado de las fases. Finalmente, el controlador propuesto alcanza características similares alos controladores destinados a la alimentación de cargas de baja tensión y alta dinámica con la ventaja adicional de la simplicidad y el bajo coste de implementación.

  • Control scheme for photovoltaic three-phase inverters to minimize peak currents during unbalanced grid-voltage sags

     Miret Tomas, Jaume; Castilla Fernandez, Miguel; Camacho Santiago, Antonio; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Matas Alcala, Jose
    IEEE transactions on power electronics
    Date of publication: 2012
    Journal article

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    Nowadays, the majority of the photovoltaic (PV) power sources are connected to the public grid. One of the main connection problems occurs when voltage sags appear in the grid due to short circuits, lightning, etc. International standards regulate the grid connection of PV systems, forcing the source to remain connected during short-time grid-voltage faults. As a consequence, during the voltage sag, the source should operate with increasing converter currents to maintain the injection of the generated power. This abnormal operation may result in nondesired system disconnections due to overcurrents. This paper proposes a controller for a PV three-phase inverter that ensuresminimum peak values in the grid-injected currents, as compared with conventional controllers. From the system analysis, a design method is presented in order to set the parameters of the control scheme. Selected experimental results are reported in order to validate the effectiveness of the proposed control.

  • Hierarchical Control of Droop-Controlled AC and DC Microgrids¿A General Approach Toward Standardization

     Guerrero Zapata, Josep Maria; Vasquez Quintero, Juan Carlos; Matas Alcala, Jose; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Castilla Fernandez, Miguel
    IEEE transactions on industrial electronics
    Date of publication: 2011-01
    Journal article

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  • Simple low-cost hysteretic controller for multiphase synchronous buck converters

     Borrell, Angel; Castilla Fernandez, Miguel; Miret Tomas, Jaume; Matas Alcala, Jose; Garcia de Vicuña Muñoz de la Nava, Jose Luis
    IEEE transactions on industrial electronics
    Date of publication: 2011-06
    Journal article

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    This paper presents a novel hysteretic controller for a multiphase synchronous buck converter supplying low voltage, high current, and high slew-rate loads. The control scheme implements the main control functions for powering such demanding loads, including output-voltage regulation, adaptive voltage positioning, current sharing, and phase interleaving. This paper also describes a control-design methodology based on outputimpedance analysis. This design leads to optimal output-voltage transient response with a simple and low-cost control implementation. Simulation and experimental results are reported in order to validate the features of the novel control scheme.

  • Sliding-mode input¿output linearization controller for the DC/DC ZVS CLL-T resonant converter

     Sosa Avendaño, Jorge Luis; Castilla Fernandez, Miguel; Miret Tomas, Jaume; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Moreno, Luz Stella
    IEEE transactions on industrial electronics
    Date of publication: 2011-10-24
    Journal article

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  • Direct Rotor Current-Mode Control Improves the Transient Response of Doubly Fed Induction Generator-Based Wind Turbines

     Castilla Fernandez, Miguel; Miret Tomas, Jaume; Matas Alcala, Jose; Borrell, Angel; Garcia de Vicuña Muñoz de la Nava, Jose Luis
    IEEE transactions on energy conversion
    Date of publication: 2010-09
    Journal article

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  • Virtual Impedance Loop for Droop-Controlled Single-Phase Parallel Inverters Using a Second-Order General-Integrator Scheme

     Matas Alcala, Jose; Castilla Fernandez, Miguel; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Miret Tomas, Jaume; Vasquez Quintero, Juan Carlos
    IEEE transactions on power electronics
    Date of publication: 2010-12
    Journal article

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  • Grid-fault control scheme for three-phase photovoltaic inverters with adjustable power quality characteristics

     Castilla Fernandez, Miguel; Miret Tomas, Jaume; Sosa Avendaño, Jorge Luis; Matas Alcala, Jose; Garcia de Vicuña Muñoz de la Nava, Jose Luis
    IEEE transactions on power electronics
    Date of publication: 2010-12-23
    Journal article

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  • SISTEMA DE SUPERVISIÓN Y CONTROL PARA MICRORREDES INTELIGENTES

     Matas Alcala, Jose; Font Mateu, Josep; Castilla Fernandez, Miguel; Vasquez Quintero, Juan Carlos; Miret Tomas, Jaume; Guerrero Zapata, Josep Maria; Garcia de Vicuña Muñoz de la Nava, Jose Luis
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  • Hierarchical Control of Intelligent Microgrids

     Vasquez Quintero, Juan Carlos; Guerrero Zapata, Josep Maria; Miret Tomas, Jaume; Castilla Fernandez, Miguel; Garcia de Vicuña Muñoz de la Nava, Jose Luis
    IEEE industrial electronics magazine
    Date of publication: 2010-12-10
    Journal article

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  • Modeling and Performance Analysis of the DC/DC Series¿Parallel Resonant Converter Operating With Discrete Self-Sustained Phase-Shift Modulation Technique

     Sosa Avendaño, Jorge Luis; Castilla Fernandez, Miguel; Miret Tomas, Jaume; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Matas Alcala, Jose
    IEEE transactions on industrial electronics
    Date of publication: 2009-03
    Journal article

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  • A Comparative Study of Sliding-Mode Control Schemes for Quantum Series Resonant Inverters

     Castilla Fernandez, Miguel; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Matas Alcala, Jose; Miret Tomas, Jaume; Vasquez Quintero, Juan Carlos
    IEEE transactions on industrial electronics
    Date of publication: 2009-09
    Journal article

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    This paper presents a comparative study of sliding-mode control schemes for quantum series resonant inverters. The single-input and two-input resonant systems considered in this study are designed with identical specifications. The control performance is evaluated in aspects such as load transient response, sensitivity to disturbances, and efficiency. Other aspects such as control complexity and cost are also considered. Simulation and experimental results are reported in order to validate the theoretical predictions. Essentially, the study demonstrates the following: 1) The load transient response of the proposed two-input system is insensitive to load variations; 2) the single-input system exhibits higher efficiency, particularly at light load conditions, and 3) both control schemes have similar complexity and cost. © 2009 IEEE.

  • Sliding-Mode Control for a Single-Phase AC/AC Quantum Resonant Converter

     Garcia de Vicuña Muñoz de la Nava, Jose Luis; Castilla Fernandez, Miguel; Miret Tomas, Jaume; Matas Alcala, Jose; Guerrero Zapata, Josep Maria
    IEEE transactions on industrial electronics
    Date of publication: 2009-09
    Journal article

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  • Design of hysteretic regulators for low voltage and high-current applications

     Cruz Vaquer, Juan; Castilla Fernandez, Miguel; Miret Tomas, Jaume; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Guerrero Zapata, Josep Maria
    International journal of industrial electronics and drives
    Date of publication: 2009-07
    Journal article

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    Design of an analog quasi-steady-state nonlinear current-mode controller for single-phase active power filter  Open access

     Miret Tomas, Jaume; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Castilla Fernandez, Miguel; Matas Alcala, Jose; Guerrero Zapata, Josep Maria
    IEEE transactions on industrial electronics
    Date of publication: 2009-12
    Journal article

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    The injection of sinusoidal current to an electrical grid is nowadays possible with the use of active power filters (APFs).With quasi-steady-state (QSS) nonlinear controllers, these power filters provide low grid-current-harmonic content with simple-control analog implementation. This paper focuses on the design of a QSS nonlinear controller for a single-phase APF. A complete analysis based on the sliding-mode-control theory is given. From the analysis, a set of control-design guidelines is presented to select the gains and parameters of the control scheme. Selected experimental results are reported to validate the theoretical design procedure.

  • Control Strategy for Flexible Microgrid Based on Parallel Line-Interactive UPS Systems

     Guerrero Zapata, Josep Maria; Vasquez Quintero, Juan Carlos; Matas Alcala, Jose; Castilla Fernandez, Miguel; Garcia de Vicuña Muñoz de la Nava, Jose Luis
    IEEE transactions on industrial electronics
    Date of publication: 2009-03
    Journal article

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    In this paper, the control strategy for a flexible microgrid is presented. The microgrid presented here consists of several line-interactive uninterruptible power supply (UPS) systems connected in parallel. The control technique is based on the droop method to avoid critical communications among UPS units. Thus, a flexible microgrid is obtained to operate in either grid-connected or islanded mode. A small-signal analysis is presented in order to analyze the system stability, which gives rules to design the main control parameters. Simulation and experimental results are presented, showing the feasibility of the proposed controller. © 2009 IEEE.

  • Decentralized control techniques applied to electric power distributed generation in microgrids  Open access

     Vasquez Quintero, Juan Carlos
    Defense's date: 2009-12-04
    Institute of Industrial and Control Engineering (IOC), Universitat Politècnica de Catalunya
    Theses

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    Distributed generation of electric energy has become part of the current electric power system. In this context a new scenario is arising in which small energy sources make up a new supply system: The microgrid.The most recent research projects show the technical difficulty of controlling the operation of microgrids, because they are complex systems in which several subsystems interact: energy sources, power electronic converters, energy storage systems, local, linear and non-linear loads and of course, the main grid. In next years, the electric grid will evolve from the current very centralized model toward a more distributed one. At the present time the generation, consumption and storage points are very far away one from each other. Under these circumstances, relatively frequent failures of the electric supply and important losses take place in the transport and distribution of energy, so that it can be stated that the efficiency of the supply system is low.In another context, electric companies are aiming at an electric grid, formed in a certain proportion by distributed generators, where the consumption points are near the generation points, avoiding high losses in the transmission lines and reducing the rate of shortcomings. Summing up, it is pursued the generation of small quantities of electric power by the users (this concept is called microgeneration in the origin), considering them not only as electric power consumers but also as responsible for the generation, becoming this way an integral part of the grid.In this context it is necessary to develop a new concept of flexible grid, i.e., with reconfiguration capability for operation with or without connection to the mains. The future microgrids should incorporate supervision and control systems that allow the efficient management of various kinds of energy generators, such as photovoltaic panels, energy storage systems, and local loads. Hence, we are dealing with intelligent flexible Microgrids capable of import and export power from/to the grid reconfiguring its operation modes and making decisions in real time.The researching lineas that have been introduced in this thesis are focused on the innovation in this kind of systems, the integration of several renewable energy sources, the quality of the power supply, security issues, and the system behavior during faults.In order to carry out some solutions related within these characteristics, the main goal of this thesis is the application on new control stretegies and a power management analysis of a microgrid. Thus, thanks to the emerging of renewable energy, is possible to give an alternative to the decoupling of generation units connected to the utility grid.Likewise, a work methodology has been analyzed and developed based on the modeling, control parameters design, and power management control starting from a single voltage source inverter to a number of interconnected DG units forming flexible Microgrids. In addition, all the mencioned topics have been studied giving new system performances, viability and safe functioning, thanks to the small-signal analysis and introducing control loop design algorithms, improving the import/export of electric power and operating both grid connected mode and an island.This thesis has presented an analysis, simulation and experimental results focusing on modeling, control, and analysis of DG units, giving contributions according to the following steps:- Control-oriented modeling based on active and reactive power analysis- Control synthesis based on enhanced droop control technique.- Small-signal stability study to give guidelines for properly adjusting the control system parameters according to the desired dynamic responseThis methodology has been extended to microgrids by using hierarchical control applied to droop-controlled line interactive UPSs showing that:- Droop-controlled inverters can be used in islanded microgrids.- By using multilevel control systems the microgrid can operate in both grid-connected and islanded mode, in a concept called flexible microgrid.The proposed hierarchical control required for flexible Microgrids consisted of different control levels, as following:- Primary control is based on the droop method allowing the connection of different AC sources without any intercommunication.- Secondary control avoids the voltage and frequency deviation produced by the primary control. Only low bandwidth communications are needed to perform this control level. A synchronization loop can be added in this level to transfer from islanding to grid connected modes.- Tertiary control allows the import/export of active and reactive power to the grid.

  • CONTROL DE SISTEMES ELECTRICS D'ENERGIA RENOVABLE

     Aldabas Rubira, Emiliano; Luna Alloza, Alvaro; Matas Alcala, Jose; Rodriguez Cortes, Pedro; Font Mateu, Josep; Candela Garcia, Jose Ignacio; Rocabert Delgado, Joan; Castilla Fernandez, Miguel; Miret Tomas, Jaume; Guerrero Zapata, Josep Maria; Vasquez Quintero, Juan Carlos; Jornet Alvarez, Atanasi; Hermoso Costa, Juan Ramon; Bogarra Rodriguez, Santiago; Rolan Blanco, Alejandro; Garcia de Vicuña Muñoz de la Nava, Jose Luis
    Participation in a competitive project

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  • Control Design Guidelines for Single-Phase Grid-Connected Photovoltaic Inverters With Damped Resonant Harmonic Compensators

     Castilla Fernandez, Miguel; Miret Tomas, Jaume; Matas Alcala, Jose; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Guerrero Zapata, Josep Maria
    IEEE transactions on industrial electronics
    Date of publication: 2009-11
    Journal article

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  • Linear Current Control Scheme With Series Resonant Harmonic Compensator for Single-Phase Grid-Connected Photovoltaic Inverters

     Castilla Fernandez, Miguel; Miret Tomas, Jaume; Matas Alcala, Jose; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Guerrero Zapata, Josep Maria
    IEEE transactions on industrial electronics
    Date of publication: 2008-07
    Journal article

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  • Feedback linearization of direct-drive synchronous wind-turbines via a sliding mode approach

     Matas Alcala, Jose; Castilla Fernandez, Miguel; Guerrero Zapata, Josep Maria; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Miret Tomas, Jaume
    IEEE transactions on power electronics
    Date of publication: 2008-05
    Journal article

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  • Feedback linearization of a single-phase active power filter via sliding mode control

     Matas Alcala, Jose; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Miret Tomas, Jaume; Guerrero Zapata, Josep Maria; Castilla Fernandez, Miguel
    IEEE transactions on power electronics
    Date of publication: 2008-01
    Journal article

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  • Decentralized Control for Parallel Operation of Distributed Generation Inverters Using Resistive Output Impedance

     Guerrero Zapata, Josep Maria; Matas Alcala, Jose; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Castilla Fernandez, Miguel; Miret Tomas, Jaume
    IEEE transactions on industrial electronics
    Date of publication: 2007-04
    Journal article

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  • Designing VRM hysteretic controllers for optimal transient response

     Castilla Fernandez, Miguel; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Guerrero Zapata, Josep Maria; Matas Alcala, Jose; Miret Tomas, Jaume
    IEEE transactions on industrial electronics
    Date of publication: 2007-06
    Journal article

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  • Simple low-cost hysteretic controller for single-phase synchronous buck converters

     Castilla Fernandez, Miguel; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Guerrero Zapata, Josep Maria; Miret Tomas, Jaume; Berbel Artal, Nestor
    IEEE transactions on power electronics
    Date of publication: 2007-07
    Journal article

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  • Dynamics analysis for the series-parallel resonant converter operating with SSPSM

     Sosa Avendaño, Jorge Luis; Castilla Fernandez, Miguel; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Matas Alcala, Jose; Miret Tomas, Jaume
    IEEE International Symposium on Industrial Electronics
    Presentation of work at congresses

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  • Uninterruptible power supply systems provide protection

     Guerrero Zapata, Josep Maria; Garcia de Vicuña Muñoz de la Nava, Jose Luis
    IEEE transactions on industrial electronics
    Date of publication: 2007-04
    Journal article

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  • Wireless-control strategy for parallel operation of distributed-generation inverters

     Guerrero Zapata, Josep Maria; Matas Alcala, Jose; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Castilla Fernandez, Miguel; Miret Tomas, Jaume
    IEEE transactions on industrial electronics
    Date of publication: 2006-10
    Journal article

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  • Droop control method for the parallel operation of online UPS systems using resistive output impedance

     Guerrero Zapata, Josep Maria; Berbel Artal, Nestor; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Matas Alcala, Jose; Miret Tomas, Jaume; Castilla Fernandez, Miguel
    Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
    Presentation of work at congresses

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  • Decentralized control for parallel operation of distributed generation inverters in microgrids using resistive output impedance

     Guerrero Zapata, Josep Maria; Berbel Artal, Nestor; Matas Alcala, Jose; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Miret Tomas, Jaume
    The 32nd Annual Conference of the IEEE Industrial Electronic Society
    Presentation of work at congresses

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  • Dynamic analysis and control design of the asymmetrical campled-mode dc-dc series resonant converter

     Sosa Avendaño, Jorge Luis; Castilla Fernandez, Miguel; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Matas Alcala, Jose; Miret Tomas, Jaume
    The 32nd Annual Conference of the IEEE Industrial Electronic Society
    Presentation of work at congresses

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  • TECNIQUES DE CONTROL NO LINIAL APLICADES A CONVERTIDORS CONNECTATS EN PARAL·LEL A UNA MICROXARXA (ENE2006-15521-C03-01)

     Garcia de Vicuña Muñoz de la Nava, Jose Luis; Castilla Fernandez, Miguel; Miret Tomas, Jaume
    Participation in a competitive project

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  • Analysis, design and practical evaluation of an input-output linearization controller for the CLL-T dc-dc resonant converter

     Sosa Avendaño, Jorge Luis; Castilla Fernandez, Miguel; Berbel Artal, Nestor; Guerrero Zapata, Josep Maria; Garcia de Vicuña Muñoz de la Nava, Jose Luis
    The 32nd Annual Conference of the IEEE Industrial Electronic Society
    Presentation of work at congresses

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  • Analysis, design and practical evaluation of an input-output linearization controller for the CLL-T dc-dc resonant converter

     Sosa Avendaño, Jorge Luis; Castilla Fernandez, Miguel; Berbel Artal, Nestor; Guerrero Zapata, Josep Maria; Garcia de Vicuña Muñoz de la Nava, Jose Luis
    The 32nd Annual Conference of the IEEE Industrial Electronic Society
    Presentation of work at congresses

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  • Output Impedance Design of Parallel-Connected UPS Inverters With Wireless Load-Sharing Control

     Guerrero Zapata, Josep Maria; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Matas Alcala, Jose; Castilla Fernandez, Miguel; Miret Tomas, Jaume
    IEEE transactions on industrial electronics
    Date of publication: 2005-08
    Journal article

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  • Design of voltage-mode hysteretic controllers for synchronous buck converters supplying microprocessor loads

     Castilla Fernandez, Miguel; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Guerrero Zapata, Josep Maria; Matas Alcala, Jose; Miret Tomas, Jaume
    IEE proceedings-Electric power applications
    Date of publication: 2005-09
    Journal article

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  • Half-bridge CLL resonant rectifier with quantum mode control

     Castilla Fernandez, Miguel; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Guerrero Zapata, Josep Maria; Miret Tomas, Jaume; Matas Alcala, Jose
    IEE proceedings-Electric power applications
    Date of publication: 2005-05
    Journal article

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  • Sliding-Mode Control of Quantum Series-Parallel Resonant Converters via Input¿Output Linearization

     Castilla Fernandez, Miguel; Garcia de Vicuña Muñoz de la Nava, Jose Luis; Guerrero Zapata, Josep Maria; Matas Alcala, Jose; Miret Tomas, Jaume
    IEEE transactions on industrial electronics
    Date of publication: 2005-04
    Journal article

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