Muñoz Aguilar, Raul Santiago
Total activity: 42
Doctoral courses
Automatización Avanzada y Robótica
Research group
REES - Renewable Electrical Energy Systems
Department
Department of Electrical Engineering
E-mail
raul.munoz-aguilarupc.edu
Contact details
UPC directory Open in new window
Scopus Author ID
35249291500 Open in new window

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1 to 42 of 42 results
  • A sensor-less sliding mode control scheme for a stand-alone wound rotor synchronous generator under unbalanced load conditions

     Muñoz Aguilar, Raul Santiago; Rodriguez Cortes, Pedro; Doria Cerezo, Arnau; Candela Garcia, Jose Ignacio; Luna Alloza, Alvaro
    International journal of electrical power and energy systems
    Date of publication: 2014-04-01
    Journal article

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    This paper presents a sliding mode control for a wound rotor synchronous machine acting as an isolated generator connected to an unbalanced load. In order to simplify the control methodology, the standard dq-model of the machine is connected to a balanced resistive load. A switching function is defined in order to fulfill the control objective. From the desired surface, the standard sliding methodology is applied to obtain a robust and very simple controller. Then, the actual measured voltage of the machines is acquired and treated trough a frequency locked loop algorithm in order to extract the positive sequence and control it to guarantee a good definition of the park transformation. A phase locked loop algorithm is also used to avoid speed sensors. Numerical simulations and experimental results validate the control law and show good performance and a fast response to load and reference changes

  • Thermal and efficiency analysis of five-level multilevel-clamped multilevel converter considering grid codes

     Ke, Ma; Muñoz Aguilar, Raul Santiago; Rodriguez Cortes, Pedro; Blaabjerg, Frede
    IEEE transactions on industry applications
    Date of publication: 2014-02
    Journal article

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    In this paper, a five-level multilevel-clamped multilevel converter (5L-MLC2) topology is analyzed based on a typical grid integration application for renewable energy system. The loss and thermal distributions of the power devices in different switching legs are investigated and illustrated under rated condition. Afterward, a loss and efficiency evaluation method is proposed and applied which takes into account various injected reactive power ranges regulated by the grid codes. It is concluded that the loss and thermal distributions of the 5L-MLC2 multilevel topology are unequal between the clamping switching legs and the main switching legs; it also shows a good and consistent efficiency characteristic under different output power ranges when complying with the grid codes.

  • Direct synchronous-asynchronous conversion system for hybrid electrical vehicle applications. An energy-based modeling approach

     Muñoz Aguilar, Raul Santiago; Doria Cerezo, Arnau; Puleston, Paul Federico
    International journal of electrical power and energy systems
    Date of publication: 2013-05-01
    Journal article

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    This paper presents a proposal for a series hybrid electric vehicle propulsion system. This new configuration is based on a wound-rotor synchronous generator (WRSM) and a doubly-fed induction machine (DFIM). The energy-based model of the whole system is obtained taking advantage of the capabilities of the port-based modeling techniques. From the dq port-controlled Hamiltonian description of the WRSM and DFIM, the Hamiltonian model of the proposed Direct Synchronous-Asynchronous Conversion System (DiSAC) is developed. Subsequently, the bond graph models of the DiSAC and associate systems are also provided. Numerical simulations are also presented in order to validate the proposed system.

    This paper presents a proposal for a series hybrid electric vehicle propulsion system. This new configuration is based on a wound-rotor synchronous generator (WRSM) and a doubly-fed induction machine (DFIM). The energy-based model of the whole system is obtained taking advantage of the capabilities of the port-based modeling techniques. From the dq port-controlled Hamiltonian description of the WRSM and DFIM, the Hamiltonian model of the proposed Direct Synchronous-Asynchronous Conversion System (DiSAC) is developed. Subsequently, the bond graph models of the DiSAC and associate systems are also provided. Numerical simulations are also presented in order to validate the proposed system

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    Thermal and efficiency analysis of five-level multi-level clamped multilevel converter considering grid codes  Open access

     Ma, Ke; Muñoz Aguilar, Raul Santiago; Rodriguez Cortes, Pedro; Blaabjerg, Frede
    IEEE transactions on industry applications
    Date of publication: 2013-06-05
    Journal article

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    In this paper a five-level Multi-Clamped Multilevel Converter (5L-MLC2) topology is analyzed based on a typical grid integration application for renewable energy system. The loss and thermal distribution of the power devices in different switching legs are investigated and illustrated under rated condition. Afterwards, a loss and efficiency evaluation method is proposed and applied which take into account various injected reactive power ranges regulated by the grid codes. It is concluded that the loss and thermal distribution of 5L-MLC2 multilevel topology is unequal between the clamping switching legs and the main switching legs, it also shows a good and consistent efficiency characteristic under different output power ranges when complying with the grid codes.

  • IEEE Power Electronics Society Paper Award

     Rodriguez Cortes, Pedro; Luna Alloza, Alvaro; Muñoz Aguilar, Raul Santiago; Etxeberria Otadui, Ion; Teodorescu, Remus; Blaabjerg, Frede
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  • IEEE Power Electronics Society Prize Letter Award

     Rodriguez Cortes, Pedro; Dias Bellar, Maria; Muñoz Aguilar, Raul Santiago; Busquets Monge, Sergio
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    Control of a Stand-Alone Wound Rotor Synchronous Generator: Two Sliding Mode Approaches via Regulation of the d-Voltage Component  Open access

     Doria Cerezo, Arnau; Utkin, Vadim; Muñoz Aguilar, Raul Santiago; Fossas Colet, Enric
    IEEE transactions on control systems technology
    Date of publication: 2012-05
    Journal article

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    In this brief two sliding mode control alternatives to regulate the stator voltage amplitude for a stand alone wound rotor synchronous generator are presented. Both controllers use the stator voltage -component error in the sliding surface. In a first case an outer proportional-integral (PI) loop controller is added to provide the proper d-voltage component reference. The second approach consists in extending the dynamic system to include the integral term as state variable and to modify the former sliding surface by adding this new state. Finally, both simulations and experimental results validates the proposed algorithms

  • A stationary reference frame grid synchronization system for three-phase grid-connected power converters under adverse grid conditions

     Rodriguez Cortes, Pedro; Luna Alloza, Alvaro; Muñoz Aguilar, Raul Santiago; Etxebarría, Ion; Teodorescu, Remus; Blaabjerg, Frede
    IEEE transactions on power electronics
    Date of publication: 2012-01
    Journal article

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    Grid synchronization algorithms are of great importance in the control of grid-connected power converters, as fast and accurate detection of the grid voltage parameters is crucial in order to implement stable control strategies under generic grid conditions. This paper presents a new grid synchronization method for three-phase three-wire networks, namely dual second-order generalized integrator (SOGI) frequency-locked loop. The method is based on two adaptive filters, implemented by using a SOGI on the stationary αβ reference frame, and it is able to perform an excellent estimation of the instantaneous symmetrical components of the grid voltage under unbalanced and distorted grid conditions. This paper analyzes the performance of the proposed synchronization method including different design issues. Moreover, the behavior of the method for synchronizing with highly unbalanced grid is proven by means of simulation and experimental results, demonstrating its excellent performance.

  • Multilevel-clamped multilevel converters (MLC2)

     Rodriguez Cortes, Pedro; D. Bellar, maria; Muñoz Aguilar, Raul Santiago; Busquets Monge, Sergio; Blaabjerg, Frede
    IEEE transactions on power electronics
    Date of publication: 2012-03
    Journal article

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    This letter introduces a new series of multilevel (ML) converters based on the ML clamping concept. By applying this technique, a ML clamping unit (MCU) conveys additional levels for synthesizing the output waveforms of a diode-clampedML dc– ac power converter. The basic building block of the ML clamping scheme is the ML clamping cell, which is composed of a pair of dc sources associated with one single-pole/triple-throw type of switch arrangement. The number of series-connected ML-clamping cells will set the number of levels of the synthesized waveform. By depending on the MCU arrangements, different converter configurations can be derived, namely, the common clamping and the modular types. Both approaches can be accomplished by employing classical three-level neutral-point-clamped (NPC) technology. Thus, the overall structure of the resultant converter is kept simple, wherein the number of parts count can be reduced, when compared with conventional NPC counterparts. In this letter, emphasis is given on the common clamping converter configuration. The attractiveness of the proposed ML concept is evidenced by conducting a comparative cost analysis. Experimental results are presented as a practicality proof of the proposed ML power converter.

  • TECCIT12-1-0009-10 - Pla de transferencia tecnologica pttu de la Univeristat Politècnica de Catalunya

     Rodriguez Cortes, Pedro; Luna Alloza, Alvaro; Hermoso Costa, Juan Ramon; Candela Garcia, Jose Ignacio; Rocabert Delgado, Joan; Muñoz Aguilar, Raul Santiago; Herrera Arias, Lidia
    Participation in a competitive project

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  • PREMIO EXTRAORDINARIO DE DOCTORADO UPC 2012

     Muñoz Aguilar, Raul Santiago
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  • Efficiency analysis of DCM-232 three-phase PV topology

     Muñoz Aguilar, Raul Santiago; Rodriguez Cortes, Pedro; Vazquez, Gerardo; Candela Garcia, Jose Ignacio; Aldabas Rubira, Emiliano
    Annual Conference of the IEEE Industrial Electronics Society
    Presentation's date: 2012-10-27
    Presentation of work at congresses

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    In this paper the losses of the DCM-232 topology for a particular modulation strategy has been analyzed. This modulation has as particular that no common mode currents are presented. Some simulation and experimental results are given in order to prove the good behavior of the topology regarding common mode voltage (CMV), the converter efficiency and the THD

  • Thermal and efficiency analysis of five-level multi-level clamped multilevel converter considering grid codes

     Ma, Ke; Muñoz Aguilar, Raul Santiago; Rodriguez Cortes, Pedro; Blaabjerg, Frede
    IEEE Energy Conversion Congress and Exposition
    Presentation's date: 2012-09-17
    Presentation of work at congresses

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    In this paper a five-level Multi-Clamped Multilevel Converter (5L-MLC2) topology is analyzed based on a typical grid integration application for renewable energy generation system. The loss and thermal distribution of the power devices in different switching legs are investigated and illustrated under rated operation. Afterwards, a loss and efficiency evaluation method is proposed and applied which takes into account various reactive power operation boundaries regulated by the grid codes. It is concluded that the 5L-MLC2 multilevel topology shows a good and consistent efficiency characteristic under different output active powers when complying with the active/reactive power operation range regulated by e.g. the German grid codes

  • Sliding mode control of a stand-alone wound rotor synchronous generator

     Muñoz Aguilar, Raul Santiago; Doria Cerezo, Arnau; Fossas Colet, Enric; Cardoner Parpal, Rafael
    IEEE transactions on industrial electronics
    Date of publication: 2011-10
    Journal article

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    This paper presents a sliding mode control for a wound rotor synchronous machine acting as an isolated generator. The standard dq model of the machine is connected to a resistive load. A switching function is defined in order to fulfill control objectives, and the ideal sliding dynamics is proved to be stable. From the desired surface, the standard sliding methodology is applied to obtain a robust and very simple controller. Numerical simulations and experimental results validate the control law and show good performance and a fast response to load and reference changes.

  • Two applications of sliding mode control in energy generation and power electronics

     Biel Sole, Domingo; Doria Cerezo, Arnau; Fossas Colet, Enric; Muñoz Aguilar, Raul Santiago; Ramos Lara, Rafael Ramon
    Date of publication: 2011-09-07
    Book chapter

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  • Overview of power processing structures for embedding energy storage in PV power converters

     Citro, Costantino; Luna Alloza, Alvaro; Rocabert Delgado, Joan; Muñoz Aguilar, Raul Santiago; Candela Garcia, Jose Ignacio; Rodriguez Cortes, Pedro
    IEEE International Conference on Industrial Electronics
    Presentation's date: 2011-11-07
    Presentation of work at congresses

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    The level of penetration of grid-connected photovoltaic (PV) systems has grown very quickly in recent years. Nonetheless, network stresses related to the recurrent voltage and frequency oscillations caused by their irregular power production could be a limiting factor on the future expansion of these applications. With the capability of storing and releasing electrical energy on demand, Energy Storage Devices (ESDs) may play a key role in finding an effective solution to overcome these kinds of problems. The aim of this paper is to provide a description of the state-of-the-art power conversion systems used to combine ESDs and grid-connected PV plants. The work has been edited after an accurate analysis of the current scientific literature, focusing particular attention on medium-high-power PV applications utilizing batteries and/or supercapacitors. A detailed analysis on advantages, disadvantages and range of application is provided for each of the reported conversion systems.

  • Symmetrical ripple constant common mode voltage modulation strategy for DCM-232 three- phase PV topology

     Rodriguez Cortes, Pedro; Muñoz Aguilar, Raul Santiago; Vázquez, Gerardo; Candela Garcia, Jose Ignacio; Aldabas Rubira, Emiliano; Etxeberria Otadui, Ion
    IEEE International Conference on Industrial Electronics
    Presentation's date: 2011-11-07
    Presentation of work at congresses

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    In this paper a modulation strategy for the DCM-232 power converter is proposed. This modulation has as particular a symmetrical ripple and that no common mode currents are presented. Some simulation and experimental results are given in order to prove the good behavior of the topology regarding common mode voltage (CMV).

  • Constant common mode voltage modulation strategy for the FB10 power converter

     Rodriguez Cortes, Pedro; Muñoz Aguilar, Raul Santiago; Vázquez, Gerardo; Candela Garcia, Jose Ignacio; Teodorescu, Remus
    IEEE Energy Conversion Congress and Exposition
    Presentation's date: 2011-09-17
    Presentation of work at congresses

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    In this paper a modulation strategy based on the classical space vector modulation is applied to the FB10 converter, a new converter topology for PV applications. Firstly, the FB10 converter is presented and the natural modulation is computed. Secondly, the simulation and experimental results are shown. Finally, the conclusions are stated.

    Postprint (author’s final draft)

  • Sensor-less sliding mode control of a stand-alone wound rotor synchronous generator with unbalanced load

     Muñoz Aguilar, Raul Santiago; Rodriguez Cortes, Pedro; Doria Cerezo, Arnau; Candela Garcia, Jose Ignacio; Luna Alloza, Alvaro
    IEEE International Conference on Industrial Electronics
    Presentation's date: 2011-11-07
    Presentation of work at congresses

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    This paper presents a Sliding Mode Control for a wound rotor synchronous machine acting as an isolated generator connected to an unbalanced load. In order to simplify the control methodology, the standard dq-model of the machine is connected to a balanced resistive load. A switching function is defined in order to fulfill the control objective. From the desired surface, the standard sliding methodology is applied to obtain a robust and very simple controller. Then, the actual measured voltage of the machines is acquired and treated trough a frequency locked loop algorithm in order to extract the positive sequence and control it to guarantee a good definition of the park transformation. A phase locked loop algorithm is also used to avoid speed sensors. Numerical simulations a validate the control law and show good performance and a fast response to load and reference changes.

  • Voltage feed-forward performance in stationary reference frame controllers for wind power applications

     Ma, Lin; Luna Alloza, Alvaro; Rocabert Delgado, Joan; Muñoz Aguilar, Raul Santiago; Corcoles Lopez, Felipe; Rodriguez Cortes, Pedro
    International Conference on Power Engineering, Energy and Electrical Drives
    Presentation's date: 2011-05-11
    Presentation of work at congresses

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  • Virtual-vector-based space vector pulse width modulation of the DC-AC multilevel-clamped multilevel converter (MLC2)

     Rodriguez Cortes, Pedro; Muñoz Aguilar, Raul Santiago; Busquets Monge, Sergio; D. Bellar, maria; Blaabjerg, Frede
    IEEE Energy Conversion Congress and Exposition
    Presentation's date: 2011-09-17
    Presentation of work at congresses

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    This work presents the development of the space vector pulse width modulation (SVPWM) of a new multi-level converter topology. First, the proposed converter and its natural space vector diagram are presented. Secondly, a modified space vector diagram based on the virtual-vectors technique is shown. Simulation results by using a space vector approach are presented. Special emphasis is given on the total harmonic distortion (THD) by making a comparison with those of the classical NPC topologies.

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    The ideal sliding dynamics of a stand alone synchronous generator  Open access

     Doria Cerezo, Arnau; Fossas Colet, Enric; Muñoz Aguilar, Raul Santiago
    European Nonlinear Dynamics Conference
    Presentation's date: 2011-07-24
    Presentation of work at congresses

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    The closes loop dynamics of a sliding-mode controlled stand alone synchronous generator with a resistive load is stuided in this paper. The resulting dynamics is piecewise continous, robust in front of parameter and load variations and performs a good regulacions of the output variable. In the ideal case we can find limit cycles tha may remain when actuators saturation effects are considered. Along the paper, numerical simulations and experimental results illustrate the complexity of the encountered behavior.

  • An overview of harmonic analysis and resonances of large wind power plant

     Rauma, Kalle; Rodriguez Cortes, Pedro; Candela Garcia, Jose Ignacio; Muñoz Aguilar, Raul Santiago; Luna Alloza, Alvaro; Nisak, Khairul
    IEEE International Conference on Industrial Electronics
    Presentation's date: 2011-11-07
    Presentation of work at congresses

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    This paper presented an overview of harmonic analysis and resonance in large wind power plant. The harmonic related problem becomes a concern as the growing numbers of nonlinear load and the increased possibility of harmonic resonances occurrence. In WPP, several conditions may contribute to the resonance phenomenon that will amplify the effect of the harmonic frequency. General overview of international standards and grid codes and basic modeling of WPP for harmonic analysis is also presented. Furthermore, an overview of the harmonic analysis methods are reviewed with emphasize given on the harmonic resonance analysis. A simple three-bus system example is evaluated applying three resonance analysis methods.

  • DC Time-Multiplexed Power Converter and its modulation technique (DCM-xyz)

     Rodriguez Cortes, Pedro; Muñoz Aguilar, Raul Santiago; Aldabas Rubira, Emiliano; Vázquez, Gerardo
    Date of request: 2011-09-12
    Invention patent

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  • Multilevel-clamped Multilevel Converters (MLC2)

     Rodriguez Cortes, Pedro; D. Bellar, maria; Muñoz Aguilar, Raul Santiago; Busquets Monge, Sergio
    Date of request: 2011-09-12
    Invention patent

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  • Control of power converters in distributed generation applications under grid fault conditions

     Rodriguez Cortes, Pedro; Luna Alloza, Alvaro; Muñoz Aguilar, Raul Santiago; Corcoles Lopez, Felipe; Teodorescu, Remus; Blaabjerg, Frede
    IEEE Energy Conversion Congress and Exposition
    Presentation's date: 2011-09-17
    Presentation of work at congresses

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    The operation of distributed power generation systems under grid fault conditions is a key issue for the massive integration of renewable energy systems. Several studies have been conducted to improve the response of such distributed generation systems under voltage dips. In spite of being less severe, unbalanced fault cause a great number of disconnections, as it may produce the injection of unbalanced currents that can easily conduct to the tripping of the converter. In this paper a current control strategy for power converters able to deal with these grid conditions, without exceeding the current ratings of the converter is introduced. Moreover, a novel flexible algorithm has been proposed in order to regulate easily the injection of positive and negative currents for general purpose applications.

  • DCM-232 converter: a PV transformerless three-phase inverter

     Rodriguez Cortes, Pedro; Muñoz Aguilar, Raul Santiago; Vázquez, Gerardo; Candela Garcia, Jose Ignacio; Aldabas Rubira, Emiliano; Etxeberria Otadui, Ion
    IEEE International Conference on Industrial Electronics
    Presentation's date: 2011-11-07
    Presentation of work at congresses

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    Nowadays transformerless PV converters are widely used in the energy conversion stage of a PV plant, because their good characteristics regarding efficiency, size, cost and weight. The main problem in transformerless PV systems is the common mode voltage variations that can generate leakage ground currents (LGC) through the parasitic capacitance formed between the PV panels and ground. These LGC are a risk for the users in a PV system therefore they should be avoided. The LGC has a clear origin on the pulse width modulation (PWM) strategy and the converter structure. In this paper a three-phase inverter with constant common mode voltage (CMV) is proposed. Simulation results are also provided.

  • Sensorless control of PMSG¿based wind energy conversion systems using a FLL¿based synchronization technique

     Aguilar, Daniel; Candela Garcia, Jose Ignacio; Muñoz Aguilar, Raul Santiago; Luna Alloza, Alvaro; Rodriguez Cortes, Pedro
    IEEE International Conference on Industrial Electronics
    Presentation's date: 2011-11-07
    Presentation of work at congresses

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  • Multilevel-clamped multilevel converters (MLC2) ¿ an alternative approach for multilevel power conversion

     Rodriguez Cortes, Pedro; D. Bellar, maria; Muñoz Aguilar, Raul Santiago; Rocabert Delgado, Joan; Luna Alloza, Alvaro
    IEEE International Conference on Industrial Electronics
    Presentation's date: 2011-11-07
    Presentation of work at congresses

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    In this paper a new multilevel power conversion concept is proposed, whereby an additional auxiliary circuit composed of multilevel clamping cells is applied to a main DCAC converter. The resultant structure, the multilevel-clamped multilevel converter, or simply multilevel-clamped converter (MLC2), has the number of levels increased, while keeping circuitry simple, wherein the number of parts count can be reduced, when compared with classical NPC counterparts. Hence, the well established three-level neutral-point-clamped (NPC) technology can be applied, which has been the preferred choice in medium-voltage (MV) high power industry for several industrial products. A description of the proposed concept is provided, on which different topologies are derived. Moreover, a cost comparison analysis is shown to illustrate their attractiveness. Simulation and experimental results based on the space vector pulse width modulation (SVPWM) are shown, in order to illustrate the operation and effectiveness of the new multilevel method.

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    Control proposals for the operation of power converters in wind power systems  Open access

     Luna Alloza, Alvaro; Aguilar, Daniel; Muñoz Aguilar, Raul Santiago; Corcoles Lopez, Felipe; Rodriguez Cortes, Pedro
    International Conference on Power Engineering, Energy and Electrical Drives
    Presentation's date: 2011-05-11
    Presentation of work at congresses

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    The wind turbines based on Doubly Fed Induction Generators (DFIG) represent almost the 60% of the installed windpower worldwide. Nowadays most of the existing algorithms, used for regulating the production of active and reactive power in such systems, are based on control techniques that use rotational reference frames theories, where the dq0 is maybe the most popular. Despite of its good operation under balanced conditions its behaviour depends on a good phase synchronization, otherwise the different transformations cannot be performed with enough guarantees. Of course this kind of response is becomming insuficient, as far as the windpower penetration is increasing. This paper will present a new control topology for DFIG, that are connected using back to back inverters, that is able to behave better in case of faulty grids. Besides some proposals for improving the operation of the DFIG will be presented as well. The aim of that part is to extend the possibilities that the back to back inverters are able to offer to the generator system by means of including new functionalities, as the active filtering capability or the reduction of the flicker emission that will be later discussed.

  • Propulsor híbrido para vehículo urbano liviano

     Muñoz Aguilar, Raul Santiago; Roqueiro, Nestor; Griño Cubero, Roberto; Fossas Colet, Enric; Doria Cerezo, Arnau; Batlle Arnau, Carles; Riera Colomer, Jordi; Olm Miras, Josep Maria; Pagano, Daniel Juan; Valencia da Luz, Mauricio; Oliveira, Amir; Nicolazzi, Lauro; de Souza Vieira, Rodrigo; Gaudenzi Faria, Marcelo; de Lima, Sigmar; de Souza Campos, David
    Participation in a competitive project

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    Two sliding mode control approaches for the stator voltage amplitude regulation of a stand-alone WRSM  Open access

     Doria Cerezo, Arnau; Utkin, Vadim; Muñoz Aguilar, Raul Santiago; Fossas Colet, Enric
    International Workshop on Variable Structure Systems
    Presentation's date: 2010-06-28
    Presentation of work at congresses

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    In this paper two sliding mode control alternatives to regulate the stator voltage amplitude for a stand alone wound rotor synchronous generator are presented. Both controllers use the stator voltage d-component error in the sliding surface. In a first case an outer PI loop controller is added to provide the proper d-voltage component reference. The second approach consists in extending the dynamic system to include the integral term as state variable and to modify the former sliding surface by adding this new state. Finally, simulations results are done in order to validate the proposed algorithms.

  • Best Presentation in Session Award at the 2010 American Control Conference (2010 ACC ThA)

     Muñoz Aguilar, Raul Santiago; Doria Cerezo, Arnau; Fossas Colet, Enric
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  • Sliding Mode Control of the Stand Alone Wound Rotor Synchronous Generator  Open access  awarded activity

     Muñoz Aguilar, Raul Santiago
    Defense's date: 2010-07-19
    Institute of Industrial and Control Engineering (IOC), Universitat Politècnica de Catalunya
    Theses

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    En esta Tesis ha sido analizado el control de la màquina sincrónica de rotor bobinado actuando en isla. Para esta configuración, la velocidad mecànica determina la frecuencia, y la tensión de rotor se utiliza para fijar la amplitud de la tensión de estator. Debido a que la constante de tiempo eléctrica es mucho más ràpida comparada con la constante de tiempo mecánica, la velocidad mecánica fue considerada constante y externamente regulada y la investigación se enfocó en la regulación de la amplitud de la tensión de estator.Cuatro diferentes controladores basados en técnicas de modos deslizantes fueron diseñados en el marco de referencia dq. Las leyes de control obtenidas regulan la amplitud de la tensión de estator independientemte del valor de la carga. Adicionalmente, sólo las medidas de tensión y posición del rotor (para calcular la transformada dq) son necesarias. La estabilidad de los puntos de equilibrio obtenidos fueron probados al menos utilizando anàlisis de pequeña señal.Se realizó la validación por simulación y experimental de cada controlador en diferentes escenarios. Los resultados obtenidos validan los diseños y muestran las principales ventajas y desventajas de el sistema en lazo cerrado.El capítulo 2 cubre los problemas de modelado de la màquina sincrónica de rotor bobinado. Partiendo de las ecuaciones trifásicas generales, y utilizando la transformada de Park, se encontraron el modelo en dq del generador sincrónico de rotor bobinado (WRSG) en isla, alimentando tanto carga resistiva como inductiva. Los puntos de equilibrio del sistema obtenido fueron analizados y calculados, luego se definió el objetivo de control. Finalmente, se obtuvieron modelos lineales aproximados y sus respectivas funciones de transferencia.Los controladores PI son los más usados en la industria porque ofrecen buen desempeño y son sencillos de implementar. En el capítulo 3, se obtuvieron las reglas de sintonización para el controlador PI, y se analizaron estos resultados con el objetivo de proponer nuevos controladores que mejoraran el desempeño de la clásica aproximación PI.El esquema de control en modos deslizantes para la WRSG conectada a una carga resistiva fue diseñado en el capítulo 4. Éste, también incluye un completo análisis de estabilidad del sistema en lazo cerrado. El capítulo 5 presenta dos diseños basados en modos deslizantes para regular la amplitud de la tensión de estator para el WRSG actuando en isla. Ambos diseños usan la componente d de la tensión de estator en la función de conmutación. El primer caso es un control anidado, donde un lazo externo PI es añadido para proveer la referencia de la componente d de la tensión. En la segunda aproximación un término integral es añadido a la superficie de conmutación.El caso de alimentar una carga inductiva es estudiado en el capítulo 6. El controlador requiere una extensión dinámica debido a que la amplitud de la tensión de estator es una salida de grado relativo cero. Como resultado, un controlador robusto, que no depende de los parámetros de la máquina ni de los valores de carga es obtenido. En el capítulo 7 los resultados de simulación y experimentales para los controladores diseñados para el WRSG actuando en isla son presentados. En primer lugar, una descripción completa del banco es presentada. Esta incluye detalles de la etapa de adquisición de datos y de la DSP utilizada. En segundo lugar, se hace la descripción del procedimiento de simulación. Luego, las simulaciones y experimentos, que contienen diferentes escenarios, con cambios de referencia y variaciones de carga para cada controlador son presentados.

    The control of the stand-alone the wound rotor synchronous generator has been analyzed in this dissertation. For this islanded configuration, the mechanical speed determines the frequency, and the rotor voltage is used to set the stator voltage amplitude. Due to the electrical time constant is so fast compared with the mechanical time constants, the mechanical speed was considered constant and externally regulated and the research was focused on the stator voltage amplitude regulation.Four different controllers based on sliding mode control techniques were designed in the dq reference frame. The obtained control laws regulate the stator voltage amplitude irrespectively of the load value. Furthermore, only voltage and rotor position measures (to compute the dq transformation), are required. The stability of the obtained equilibrium points was proved at least using small-signal analysis. Simulation and experimental validation of each controller containing several scenarios were carried out. The obtained results validate the designs and show the main advantages and disadvantages of each closed loop system. Chapter 2 covers the modeling issues of the wound rotor synchronous machine. From the general three-phase dynamical equations, and using the Park transformation, the dq-model of the stand-alone wound rotor synchronous generator feeding both a resistive and an inductive load are obtained. Equilibrium points of the obtained systems are analyzed and, after defining the control objective, the desired equilibrium points are computed.Finally, linear approximated models are obtained and their transfer functions are also presented.PI controllers are the most used in the industry because they offers good performance and are easily implementables. In Chapter 3 we obtain the tuning rule for the PI controller, and we analyze these results in order to propose new controllers which improve the classic PI approach.The sliding mode control scheme for the WRSG connected to a resistive load is designed in Chapter 4. It also includes a complete stability analysis of the closed loop system. Chapter 5 presents two sliding mode designs to regulate the stator voltage amplitude for a stand-alone wound rotor synchronous generator. Both use the stator voltage d-component error in the switching function. The first case is a nested controller, where an outer PI loop is added to provide the proper d-voltage component reference. In the second approach an integral term is added to the switching function. The case of feeding an inductive load is studied in Chapter 6. The controller introduces a dynamic extension because the stator voltage amplitude is a zero relative degree output. As result, a robust controller, which neither depends on the machine parameters nor on the load values, is obtained. In Chapter 7 the simulation and the experimental results of the designed controllers for the stand-alone wound rotor synchronous generator are presented. Firstly, a complete description of the bench is provided. It also includes details of the data acquisition stage and the used DSP card. Secondly, the description of the simulation procedure is commented. Then, the simulation and experiments which contains several scenarios, with reference change and load variations evaluated for each controller are presented.

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    A sliding mode control for a wound rotor synchronous generator with an isolated RL load  Open access  awarded activity

     Muñoz Aguilar, Raul Santiago; Doria Cerezo, Arnau; Fossas Colet, Enric
    American Control Conference
    Presentation's date: 2010-07-01
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    In this paper a sliding mode controller for the stator voltage amplitude of a stand-alone wound rotor synchronous generator is presented. The standard dq-model of the electrical machine connected to an isolated inductive load is obtained. Then, a control law is designed in the framework of sliding mode control. The controller introduces a dynamic extension so that the stator amplitude relative degree is one. Numerical simulations are also presented to validate the presented control law.

    Best Presentation in Session Award, Americal Control Conference 2010

  • Hierarchical Control in Microgrids for the Integration of Decentralized Electrical Generators and Energy Storage Systems

     Garcia de Vicuña Muñoz de la Nava, Jose Luis; Muñoz Aguilar, Raul Santiago; Rocabert Delgado, Joan; Vasquez Quintero, Juan Carlos; Miret Tomas, Jaume; González, J.; Miró, I.; Sandia, J.; González, R.; Abellán, A.; Martínez, J. A.; Carranza, O.; Benavent, J. M.; Garcerá, Gabriel; Figueres, Emilio; Abellán, Antonio; Pascual, Marcos; Castilla Fernandez, Miguel; Matas Alcala, Jose; Guerrero Zapata, Josep Maria
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  • 2º SIMPOSIO SOBRE INTEGRACION EN LA RED ELECTRICA DE ENERGIA EOLICA

     Rocabert Delgado, Joan; Hermoso Costa, Juan Ramon; Candela Garcia, Jose Ignacio; Aldabas Rubira, Emiliano; Luna Alloza, Alvaro; Muñoz Aguilar, Raul Santiago; Rodriguez Cortes, Pedro
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    Energy-based modelling and simulation of a series hybrid electric vehicle propulsion system  Open access

     Muñoz Aguilar, Raul Santiago; Doria Cerezo, Arnau; Puleston, Paul
    European Conference on Power Electronics and Applications
    Presentation's date: 2009-09-08
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    This paper presents an energy-based model of a series hybrid electric vehicle. The proposed propulsion system has a new configuration using a wound-rotor synchronous generator (WRSM) and a doublyfed induction machine (DFIM). From the classic dq dynamical equations of the WRSM and DFIM the port-controlled Hamiltonian models of each machine is described. One of the abilities of the port-based models is that the complete model is easy to obtain by means of interconnection rules. Following this, the Hamiltonian model of the whole system is obtained. Similarly, the bond graph approach allows to build a complex model by interconnecting several subsystems. This paper also contains bond graph models of the machines and the propulsion system. Numerical simulations are also presented in order to validate the proposed models.

    Postprint (author’s final draft)

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    Sliding mode control of an isolated wound rotor synchronous generator  Open access

     Doria Cerezo, Arnau; Fossas Colet, Enric; Muñoz Aguilar, Raul Santiago; Utkin, Vadim
    European Control Conference
    Presentation's date: 2009-08-23
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    Robust exact differentiation via sliding mode technique applied to a fixed-frequency quasi-sliding control algorithm  Open access

     Biel Sole, Domingo; Fossas Colet, Enric; Meza Benavides, Carlos; Muñoz Aguilar, Raul Santiago
    Date: 2008-01-08
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    This paper presents the design of a DC-AC power converter controller that bears the same benefits of a sliding mode controller but with the advantage of a fixed-frequency control signal. The controller is based on the imposition of zero averaged value of the sliding surface in each switching cycle. A keypoint of the presented controller is the calculation of the sliding surface’s derivative which in the present paper is obtained using an estimation algorithm introduced by Levant in 1998.

  • Automatización y Control de Equipos en los Laboratorios de Procesos Productivos de la Universidad Nacional de Colombia Sede Manizales

     Angulo García, Fabiola; Muñoz Aguilar, Raul Santiago; Londoño Carvajal, Adela; Marín, Jorge Eliécer; Mesa Rueda, Fabio Augusto
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