Graphic summary
  • Show / hide key
  • Information


Scientific and technological production
  •  

1 to 50 of 230 results
  • On Performance Advances of Flying Capacitor Multilevel Converter Topologies

     Amer Mohammad Yusuf Mohammad Ghias
    The University of New South Wales
    Theses

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

    The main focus of this thesis is to develop advanced modulation and voltage balancing methods for multilevel converter topologies, able to achieve stiff capacitor voltage regulation and reduce switching power losses of the converters. The study is focused on multilevel converter topologies based on flying capacitors (FCs), such as the multilevel flying capacitor converter (FCC) and the stacked multicell converter. Two modulation strategies are investigated; phase-shifted PWM and phase-disposition PWM, and improved voltage balancing methods have been developed and incorporated to these modulation techniques. The analysis of the converter is conducted in terms of switching frequency reduction, power losses, total harmonic distortion, and capacitor voltage ripples. This thesis also addresses the initial charging of FCs in grid-connected applications. A novel method for precharging the capacitors in the multilevel FCC is presented. The method can charge the capacitors in a controlled way besides producing low voltage and current stress to the power devices and the passive components. The method is simple and can be implemented and can be applied to FCCs with any number of levels. All the methods proposed in this thesis have been tested by simulation and experimental tests.

  • SiC modular multilevel converters: sub-module voltage ripple analysis and efficiency estimations

     Perez Basante, Angel; Pou Felix, Josep; Ceballos Recio, Salvador; Gil De Muro, Asier; Pujana, Ainhoa; Ibañez, Pedro
    International Exhibition & Conference for Power Electronics Intelligent Motion Power Quality
    p. 1418-1425
    Presentation's date: 2014-05
    Presentation of work at congresses

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

    Two important technical challenges associated with the Modular Multilevel Converter (MMC) are the reduction of the voltage ripple of the Sub-Module (SM) capacitors and the reduction of the converter losses. This paper conducts a study focused on these two topics. Firstly, the effect of a circulating current with a predefined second harmonic on the SM voltage ripple is assessed. Secondly, an efficiency study for two different MMCs, one with silicon (Si) and the other with silicon carbide (SiC) devices is carried out. Results suggest that a SiC MMC converter with a circulating current including a second harmonic represent a good solution since it achieves a reduction of the SM capacitors together with a high efficiency operation.

  • Comparison of phase-shifted and level-shifted PWM in the modular multilevel converter

     Darus, Rosheila; Konstantinou, Georgios; Pou Felix, Josep; Ceballos Recio, Salvador; Agelidis, Vassilios
    International Power Electronics Conference
    p. 3764-3770
    DOI: 10.1109/IPEC.2014.6870039
    Presentation's date: 2014-05-18
    Presentation of work at congresses

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

    This paper reports a comparison study of different carrier-based PWM techniques applied to the modular multilevel converter. Phase-disposition PWM (PD-PWM) and phase-shifted pulse-width modulation (PS-PWM) with non-interleaving and interleaving are considered in this study. In PS-PWM, two cases are evaluated. In the first case, the particular SMs that have to be activated/deactivated are defined by a voltage balancing algorithm, which is the same one implemented in PD-PWM. In addition, an algorithm to restrict the number of switching SMs is also implemented to reduce the switching frequency of the power devices. In the other case of PS-PWM, each sub-module (SM) has a carrier signal associated to it and capacitor voltage balance is achieved by individual control of its capacitor voltage. The circulating current is controlled to be a dc component in all the cases. Simulation and experimental results are presented to evaluate the quality of the line-to-line output voltages and SM capacitor voltage ripples for the different cases under study. © 2014 IEEE.

  • Varying and unequal carrier frequency PWM techniques for modular multilevel converters

     Konstantinou, Georgios; Darus, Rosheila; Pou Felix, Josep; Ceballos Recio, Salvador; Agelidis, Vassilios
    International Power Electronics Conference
    p. 3758-3763
    DOI: 10.1109/IPEC.2014.6870038
    Presentation's date: 2014-05
    Presentation of work at congresses

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

    Carrier-based pulse-width modulation (PWM) strategies are commonly applied to modular multilevel converters (MMC). This paper proposes a modified PWM technique with unequal and varying carrier frequencies between consecutive levels. The variation between two consecutive carriers is calculated in order to maintain a constant average switching frequency regardless of modulation index and number of levels in the output. The proposed method effectively shifts the major harmonic content of output waveforms to higher frequencies at the cost of a slight increase in low order harmonics. Details on the derivation of the carrier frequencies as well as simulation and experimental results of the proposed method demonstrate the viability of the method as an alternative modulation technique for the MMC.

  • A modified voltage balancing sorting algorithm for the modular multilevel converter: Evaluation for staircase and phase-disposition PWM

     Darus, Rosheila; Pou Felix, Josep; Konstantinou, Georgios; Ceballos Recio, Salvador; Agelidis, Vassilios
    IEEE Applied Power Electronics Conference and Exposition
    p. 255-260
    DOI: 10.1109/APEC.2014.6803318
    Presentation's date: 2014-03
    Presentation of work at congresses

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

    This paper introduces a low complexity implementation of the voltage balancing sorting algorithm to reduce the switching frequency of the power devices in modular multilevel converters (MMCs). Two modulation techniques are evaluated; staircase modulation and phase-disposition pulse-width modulation (PD-PWM) under the conventional and the proposed algorithm. Using a circulating current controller in an MMC with 12 sub-modules per arm, PD-PWM yields better results compared to the staircase modulation technique. The test condition for this comparison is such that the power devices operate at a similar switching frequency and produce similar amplitudes to the capacitor voltage ripples in both modulation techniques. The results are verified through extensive simulations and experimentally using a phase-leg MMC laboratory prototype.

  • Access to the full text
    Single-stage inverter-based grid-connected photovoltaic system with ride-through capability over different types of grid faults  Open access

     Mirhosseini, Mitra; Pou Felix, Josep; Agelidis, Vassilios
    Annual Conference of the IEEE Industrial Electronics Society
    p. 8008-8013
    DOI: 10.1109/IECON.2013.6700471
    Presentation's date: 2013-11
    Presentation of work at congresses

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

    In this paper the control of a single-stage grid-connected photovoltaic power plant (GCPPP) is developed to address the issue of inverter disconnection under various grid faults. There are three main reasons for inverter disconnection which are (i) excessive dc-link voltage, (ii) excessive ac currents and (iii) loss of grid-voltage synchronization. The control of the inverter incorporates reactive power support in the case of voltage sags based on grid code requirements to ride-through the faults and support the grid voltages. Accordingly, another requirement of the grid codes is to control the reactive current injection under unbalanced voltage sags so that the voltages in the non-faulty phases do not exceed the specified limitations. All these issues are discussed in this paper for a case study of 1-MVA GCPPP using MATLAB/Simulink. The results illustrate the capability of the developed GCPPP to ride-through different types of faults occurred on the grid side.

  • Improving capacitor voltage ripples and power losses of modular multilevel converters through discontinuous modulation

     Picas Prat, Ricard; Ceballos Recio, Salvador; Pou Felix, Josep; Zaragoza Bertomeu, Jordi; Konstantinou, Georgios; Agelidis, Vassilios
    Annual Conference of the IEEE Industrial Electronics Society
    p. 6233-6238
    DOI: 10.1109/IECON.2013.6700160
    Presentation's date: 2013-11
    Presentation of work at congresses

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

  • Interleaved selective harmonic elimination PWM for single-phase rectifiers in traction applications

     Konstantinou, Georgios; Agelidis, Vassilios; Pou Felix, Josep
    Annual Conference of the IEEE Industrial Electronics Society
    p. 930-935
    DOI: 10.1109/IECON.2013.6699258
    Presentation's date: 2013-11
    Presentation of work at congresses

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

    Interleaved four-quadrant, single-phase rectifiers are widely used in traction applications as part of an AC-DC-AC conversion system. This paper presents selective harmonic elimination pulse-width modulation (SHE-PWM) patterns for single-phase interleaved PWM rectifiers based on both H-bridges and full-bridge NPCs (H-NPCs). SHE-PWM waveforms are defined so that the low-order harmonics of the combined voltage and input currents on the primary of the supply transformer are eliminated. The formulation of the problem and the acquisition of solutions becomes more challenging as the number of levels in the voltage waveform increases. Solutions based on reduced eliminated harmonics are proposed in order to increase the number of solutions as well as their continuity. It is shown that the proposed formulation improves the available solution space with minimal effect to the output. The theoretical analysis are verified through simulation studies.

  • Access to the full text
    Optimum state voltage balancing method for stacked multicell converters  Open access

     Ghias, Amer M.Y.M; Pou Felix, Josep; Agelidis, Vassilios; Ciobotaru, Mihai
    Annual Conference of the IEEE Industrial Electronics Society
    p. 6293-6298
    DOI: 10.1109/IECON.2013.6700170
    Presentation's date: 2013-11
    Presentation of work at congresses

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

    This paper presents a voltage balancing method for stacked multicell converters based on phase disposition pulse-width modulation. This method is based on minimizing a cost function to determine the optimum redundant state for capacitor voltage balance for each particular voltage level. The robustness of the proposed voltage balancing method is verified against static and dynamic unbalanced load conditions. Furthermore, a significant reduction in the switching frequencies of the power devices is achieved by using sawtooth carriers instead of standard triangular carriers without affecting the voltage balancing capability.

  • Voltage balancing method using phase-shifted PWM for stacked multicell converters

     Ghias, Amer M.Y.M; Pou Felix, Josep; Agelidis, Vassilios; Ciobotaru, Mihai
    Annual Conference of the IEEE Industrial Electronics Society
    p. 6334-6339
    DOI: 10.1109/IECON.2013.6700177
    Presentation's date: 2013-11
    Presentation of work at congresses

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

    This paper proposes an active voltage balancing method for stacked multicell converters (SMC) using phase-shifted pulse-width modulation, which is easy to implement and extend to high number of levels. The proposed method balances the voltages of the capacitors by modifying the duty cycle of each switch of the SMC using a proportional controller. The crossed effect between capacitor currents and duty cycles is considered and is used for optimal capacitor voltage balance. The performance of the proposed voltage balancing method is verified by simulation for different operating conditions, such as unbalanced linear loads, non-linear loads and load transients.

  • The modular multilevel converter and other multilevel topologies

     Pou Felix, Josep; Zaragoza Bertomeu, Jordi
    Brazilian Power Electronics Conference
    Presentation's date: 2013-10-27
    Presentation of work at congresses

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

  • Voltage-source converters for HVDC systems

     Pou Felix, Josep; Ceballos Recio, Salvador; Konstantinou, Georgios; Zaragoza Bertomeu, Jordi
    Brazilian Power Electronics Conference
    Presentation's date: 2013-10-30
    Presentation of work at congresses

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

  • State-of-the-art in multilevel power electronics conversion. Tutorial on Advanced Multilevel Converter Systems

     Konstantinou, Georgios; Pou Felix, Josep; Agelidis, Vassilios
    Australasian Universities Power Engineering Conference
    Presentation's date: 2013-10-03
    Presentation of work at congresses

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

    Multilevel power electronics converters offer significant advantages over the two-level counterparts, particularly in high-power, high-voltage applications. This tutorial will provide an overview of the state-of-the-art for multilevel power electronics converters and focus on two major developments of the last years, hybrid multilevel converters (HMCs) and the modular multilevel converter (MMC).

  • Access to the full text
    Analysis of a voltage balancing technique with reduced switching transitions in a flying capacitor multilevel converter  Open access

     Ghias, Amer M.Y.M; Pou Felix, Josep; Agelidis, Vassilios; Ciobotaru, M.
    Australasian Universities Power Engineering Conference
    p. 1-6
    Presentation's date: 2013-09-29
    Presentation of work at congresses

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

    This paper reports the analysis of a voltage balancing technique based on optimal switching transitions for a flying capacitor (FC) multilevel converter using phase disposition pulse-width modulation. Since multiple switching transitions between two consecutive voltage levels may be available, such a redundancy is used to regulate the FC voltages at their desired levels. For the selection of the transitions, two techniques are studied and compared in terms of capacitor voltage ripples and switching frequencies. In the first technique, called optimum transition voltage balancing technique, the transitions between two consecutive voltage levels that produce high switching frequencies are avoided. On the other hand, all the transitions between consecutive levels are considered in the second technique. It is therefore called unrestricted voltage balancing technique. Study analyses are conducted by simulation considering all the possible modulation indices and load power factors.

    Postprint (author’s final draft)

  • Access to the full text
    Positive- and negative-sequence control of grid-connected photovoltaic systems under unbalanced voltage conditions  Open access

     Mirhosseini, Mitra; Pou Felix, Josep; Karanayil, Baburaj; Agelidis, Vassilios
    Australasian Universities Power Engineering Conference
    p. 1-6
    Presentation's date: 2013-09-30
    Presentation of work at congresses

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

    This paper discusses the control of the positive- and negative-sequence components of a large-scale grid-connected photovoltaic system (GCPS) under unbalanced voltage sag conditions in the grid. Some issues regarding stability and dynamic performance of the system occur when applying PI controllers in the current control loops. The reason is the delay that the filtering method imposes when extracting the current/voltage sequences. Because of such a delay, the dynamic response of the system becomes slower compared with the case when no filtering technique is needed. Furthermore, there is a strong restriction on choosing suitable parameters for the current/voltage loop controllers without compromising system stability. All these issues are discussed in this paper on a 1-MVA GCPV system using MATLAB/Simulink software.

    Postprint (author’s final draft)

  • Current improvement of a grid-connected photovoltaic system under unbalanced voltage conditions

     Mirhosseini, Mitra; Pou Felix, Josep; Agelidis, Vassilios
    IEEE Annual International Energy Conversion Congress and Exhibition for the Asia/Pacific
    p. 66-72
    DOI: 10.1109/ECCE-Asia.2013.6579075
    Presentation's date: 2013-06
    Presentation of work at congresses

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

    This paper discusses the performance of a large-scale grid-connected photovoltaic system (GCPS) under unbalanced voltage sag conditions in the grid. By applying the droop control to address the low-voltage-ride-through (LVRT) capability, the output currents are no longer sinusoidal due to the oscillations produced in the current references. To deal with this problem a moving average filter (MAF) technique is proposed. Beside this application, there are other advantages of applying the MAF which are described in this paper. Selected simulation results using MATLAB/Simulink for a 1-MVA GCPS confirm the effectiveness of the proposed method.

    This paper discusses the performance of a large-scale grid-connected photovoltaic system (GCPS) under unbalanced voltage sag conditions in the grid. By applying the droop control to address the low-voltage-ride-through (LVRT) capability, the output currents are no longer sinusoidal due to the oscillations produced in the current references. To deal with this problem a moving average filter (MAF) technique is proposed. Beside this application, there are other advantages of applying the MAF which are described in this paper. Selected simulation results using MATLAB/Simulink for a 1-MV A GCPS confirm the effectiveness of the proposed method.

  • PWM algorithm with adaptive offset for three-level multi-phase neutral-point-clamped converters

     López, Iraide; Ceballos Recio, Salvador; Andreu, Jon; Kortabarria, Iñigo; Pou Felix, Josep
    Annual Conference of the IEEE Industrial Electronics Society
    p. 1185-1190
    DOI: 10.1109/IECON.2013.6699301
    Presentation of work at congresses

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

    This paper proposes a PWM based modulation strategy particularly useful for three-level multi-phase Neutral-Point-Clamped Converters. It achieves similar results to those obtained with the space vector modulation but allowing a very fast and simple implementation in a digital controller. The proposed algorithm is able to maintain the neutral-point voltage under control by the addition of a zero-sequence voltage component to the modulation signals. A simple and efficient methodology to calculate the most appropriate zero-sequence component is described. In addition the modulation strategy is completely general, regardless the number of phases of the converter, and therefore it is easy extendible to n-phase converters.

  • ESTRATEGIAS CONTROL GENERADORS OFFSHORE Y CONVERTIDORES MULTINIVEL CONECTADOS RED ELECTRICA SISTEMAS TRANSMISION HVDC

     Jaen Fernandez, Carlos; Arias Pujol, Antoni; Zaragoza Bertomeu, Jordi; Capella Frau, Gabriel Jose; Jarauta Bragulat, Eusebio; Hervada Sala, Carme; Buenestado Caballero, Pablo; Pou Felix, Josep
    Competitive project

     Share

  • Estrategias de control de generadores offshore y convertidores multinivel conectados a la red eléctrica en sistemas de transmisión de HVDC

     Pou Felix, Josep; Zaragoza Bertomeu, Jordi; Jaen Fernandez, Carlos; Arias Pujol, Antoni; Hervada Sala, Carme; Jarauta Bragulat, Eusebio; Buenestado Caballero, Pablo; Capella Frau, Gabriel Jose
    Competitive project

     Share

  • Access to the full text
    Voltage balancing method for a seven-level stacked multicell converter using minimum-switching transitions  Open access

     Ghias, Amer M.Y.M; Pou Felix, Josep; Agelidis, Vassilios; Ciobotaru, Mihai
    Annual Conference of the IEEE Industrial Electronics Society
    p. 6328-6333
    DOI: 10.1109/IECON.2013.6700176
    Presentation of work at congresses

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

    This paper presents a voltage balancing method for stacked multicell converters based on phase disposition pulse-width modulation. This method is based on minimizing a cost function to determine the optimum redundant state for capacitor voltage balance for each particular voltage level. The robustness of the proposed voltage balancing method is verified against static and dynamic unbalanced load conditions. Furthermore, a significant reduction in the switching frequencies of the power devices is achieved by using sawtooth carriers instead of standard triangular carriers without affecting the voltage balancing capability.

  • Access to the full text
    Evaluation of DC-link decoupling using electrolytic or polypropylene film capacitors in three-phase grid-connected photovoltaic inverters  Open access

     Karanayil, Baburaj; Agelidis, Vassilios; Pou Felix, Josep
    IEEE International Conference on Industrial Electronics
    p. 6980-6986
    DOI: 10.1109/IECON.2013.6700290
    Presentation of work at congresses

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

    The life expectancy and long term reliability of grid-connected three-phase photovoltaic (PV) inverters can be increased by replacing the conventional electrolytic film capacitors by metallized polypropylene film capacitors. This paper presents a detailed evaluation of a three-phase gridconnected PV inverter performance when replacing the electrolytic capacitor with a minimum value of metallized polypropylene film capacitor-one. The minimum dc bus capacitance leads to larger voltage ripples. However, such ripples were found to be within acceptable limits to run the inverter satisfactorily. Simulation results are presented for a 15-kW gridconnected inverter at nominal voltage of 700V dc and experimental results are provided for a 3.0-kW system at a nominal voltage of 400V dc, built in the laboratory.

    The life expectancy and long term reliability of grid-connected three-phase photovoltaic (PV) inverters can be increased by replacing the conventional electrolytic film capacitors by metallized polypropylene film capacitors. This paper presents a detailed evaluation of a three-phase grid-connected PV inverter performance when replacing the electrolytic capacitor with a minimum value of metallized polypropylene film capacitor-one. The minimum dc bus capacitance leads to larger voltage ripples. However, such ripples were found to be within acceptable limits to run the inverter satisfactorily. Simulation results are presented for a 15-kW grid-connected inverter at nominal voltage of 700V dc and experimental results are provided for a 3.0-kW system at a nominal voltage of 400V dc, built in the laboratory.

  • Optimal injection of harmonics in circulating currents of modular multilevel converters for capacitor voltage ripple minimization

     Picas Prat, Ricard; Pou Felix, Josep; Ceballos Recio, Salvador; Zaragoza Bertomeu, Jordi; Konstantinou, Georgios; Agelidis, Vassilios
    IEEE Annual International Energy Conversion Congress and Exhibition for the Asia/Pacific
    p. 318-324
    DOI: 10.1109/ECCE-Asia.2013.6579115
    Presentation of work at congresses

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

    This paper proposes an algorithm to calculate the optimal amplitude and phase of the harmonic current components that can be injected in the circulating currents of a modular multilevel converter (MMC) to minimize the capacitor voltage fluctuations. An optimal second harmonic component and an optimal set of second and fourth harmonic components are proposed. Simulation results are obtained in MATLAB/Simulink environment to study the effectiveness of the calculated optimal currents. Selected experimental results have been obtained from an MMC laboratory prototype, testing the effects of the circulating currents. The reported results demonstrate the effectiveness of using a fourth harmonic component in the circulating current, which improves the effect of the second harmonic on reducing the capacitor voltage fluctuations.

    This paper proposes an algorithm to calculate the optimal amplitude and phase of the harmonic current components that can be injected in the circulating currents of a modular multilevel converter (MMC) to minimize the capacitor voltage fluctuations. An optimal second harmonic component and an optimal set of second and fourth harmonic components are proposed. Simulation results are obtained in MATLAB/Simulink environment to study the effectiveness of the calculated optimal currents. Selected experimental results have been obtained from an MMC laboratory prototype, testing the effects of the circulating currents. The reported results demonstrate the effectiveness of using a fourth harmonic component in the circulating current, which improves the effect of the second harmonic on reducing the capacitor voltage fluctuations.

  • Circulating current control and evaluation of carrier dispositions in modular multilevel converters

     Darus, Rosheila; Pou Felix, Josep; Konstantinou, Georgios; Ceballos Recio, Salvador; Agelidis, Vassilios
    IEEE Annual International Energy Conversion Congress and Exhibition for the Asia/Pacific
    p. 332-338
    DOI: 10.1109/ECCE-Asia.2013.6579117
    Presentation of work at congresses

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

    This paper presents two control techniques to minimize the circulating currents of the modular multilevel converter. The control techniques reduce the amplitude of each capacitor voltage ripple. Multicarrier level-shifted pulse-width-modulation is applied and the performance of interleaving and non-interleaving the carrier waveforms between the upper and the lower arms is reported. The total harmonic distortion of the output common voltage and rms value of the arms currents are benchmarked against the case when such techniques are not employed. The techniques have been verified by simulation using MATLAB/Simulink and PLECS Blockset software. Experimental results from a low power phase-leg prototype built with five sub-modules per arm are also provided.

  • Access to the full text
    Control strategy to balance operation of parallel connected legs of modular multilevel converters  Open access

     Pou Felix, Josep; Ceballos Recio, Salvador; Konstantinou, Georgios; Capella Frau, Gabriel Jose; Agelidis, Vassilios
    IEEE International Symposium on Industrial Electronics
    p. 1-7
    DOI: 10.1109/ISIE.2013.6563685
    Presentation of work at congresses

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

    Connecting legs of modular multilevel converters (MMCs) in parallel can assist an MMC-based high-voltage direct current (HVDC) to increase its current ratings and hence overall power handling capability. Consequently, each phase of the MMC would be integrated by several legs or sets of upper and lower arms (ULAs). This paper proposes a current control strategy for each ULA in order to ensure balanced current sharing among them. In addition, each ULA has its own circulating current control that follows a reference obtained from the instantaneous magnitudes of the output current and the modulation signal. All the proposed control actuations do not distort the phase output voltage of the MMC which follows the reference voltage. The performance of the proposed control strategies is evaluated by simulation studies in the PLECS Blockset under MATLAB/Simulink software platform.

    Postprint (author’s final draft)

  • Voltage balancing method for the multilevel flying capacitor converter using phase-shifted PWM

     Ghias, Amer M.Y.M; Pou Felix, Josep; Ciobotaru, M.; Agelidis, Vassilios
    IEEE International Conference on Power and Energy
    p. 274-279
    DOI: 10.1109/PECon.2012.6450221
    Presentation's date: 2012-12
    Presentation of work at congresses

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

    n flying capacitor (FC) converters, phase-shifted pulse-width modulation (PS-PWM) provides natural voltage balancing. However, for a practical application, a more robust balancing mechanism of maintaining the FC voltages at the desired values is required. This paper proposes a new closed-loop voltage balancing method for multilevel FC converters using PS-PWM. The proposed method balances the voltages of the FCs by modifying the duty cycle of each switch of the FC converter using a proportional (P) controller. The crossed effect between FC currents and duty cycles is considered and is used for FC voltage balancing. The Simulation results verify that the proposed voltage balancing method is very robust to different operating conditions, such as load transients and non-linear loads.

  • Access to the full text
    Voltage balancing scheme for the multilevel flying capacitor converter using phase-shifted PWM  Open access

     Ghias, Amer M.Y.M; Pou Felix, Josep; Ciobotaru, M.; Agelidis, Vassilios
    IEEE International Conference on Power and Energy
    p. 1-6
    DOI: 10.1109/IECON.2012.6389568
    Presentation's date: 2012-12
    Presentation of work at congresses

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

    In flying capacitor (FC) converters, phase-shifted pulse-width modulation (PS-PWM) provides natural voltage balancing. However, for a practical application, a more robust balancing mechanism of maintaining the FC voltages at the desired values is required. This paper proposes a new closed-loop voltage balancing method for multilevel FC converters using PS-PWM. The proposed method balances the voltages of the FCs by modifying the duty cycle of each switch of the FC converter using a proportional (P) controller. The crossed effect between FC currents and duty cycles is considered and is used for FC voltage balancing. The Simulation results verify that the proposed voltage balancing method is very robust to different operating conditions, such as load transients and non-linear loads.

    Postprint (author’s final draft)

  • Access to the full text
    Voltage balancing strategy for a five-level flying capacitor converter using phase disposition PWM with sawtooth-shaped arriers  Open access

     Ghias, Amer M.Y.M; Pou Felix, Josep; Ciobotaru, M.; Agelidis, Vassilios
    IEEE International Conference on Industrial Electronics
    p. 1-6
    Presentation's date: 2012-10
    Presentation of work at congresses

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

    The flying capacitor (FC) multilevel converter has attracted a great deal of interest in the recent years because of its easier extension to a higher number of levels (n>;3), as compared to its counterpart, the diode-clamped converter (DCC). The main focus of this paper is to develop a voltage balancing scheme of FCs for a five-level FC converter based on phase disposition pulse-width modulation (PD-PWM). Since there are multiple states that produce the same output voltage at the leg of the converter, such a redundancy is used to regulate the FC voltages at their desired levels. The selection of the optimal states is performed by minimizing a cost function. A drawback observed when using standard symmetrical triangular carriers for the PD-PWM, is the additional switching events that are produced due to transitions within the same voltage level. Nevertheless, this fact can be avoided by using sawtooth carrier waveforms instead. Simulation results verify the robustness of the proposed voltage balancing scheme against static and dynamic load conditions. Moreover, using sawtooth carriers a significant reduction of the switching frequency is achieved as compared to the use of standard triangle carriers while maintaining the FC voltage balanced.

    Postprint (author’s final draft)

  • Access to the full text
    Voltage balancing of a five-level flying capacitor converter using optimum switching transitions  Open access

     Ghias, Amer M.Y.M; Pou Felix, Josep; Ciobotaru, M.; Agelidis, Vassilios
    IEEE International Conference on Industrial Electronics
    p. 1-6
    Presentation's date: 2012-10
    Presentation of work at congresses

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

    The flying capacitor (FC) multilevel converter requires a capacitor voltage balancing mechanism for proper operation. This paper proposes a voltage balancing scheme for a five-level FC converter based on phase disposition pulse-width modulation (PD-PWM) using transitions that produce the minimum number of switching events. This strategy will be called optimal-transition voltage balancing (OTVB) scheme. Since multiple optimum switching transitions between two consecutive voltage levels may be available, such a redundancy is used to regulate the FC voltages at their desired levels. Those transitions that produce more switching events are avoided. The rest of transitions are evaluated by means of a cost function and the one that produces the minimum value is selected. Simulation results show a significant reduction of the average switching frequency as compared to the use of the optimal-state voltage balancing (OSVB) scheme, while maintaining the balance of the FC voltages. Moreover, the proposed PD-PWM voltage balancing strategy is robust to static and dynamic load conditions.

    Postprint (author’s final draft)

  • Access to the full text
    Minimization of the capacitor voltage fluctuations of a modular multilevel converter by circulating current control  Open access

     Picas Prat, Ricard; Pou Felix, Josep; Ceballos Recio, Salvador; Agelidis, Vassilios; Saeedifard, Maryam
    IEEE International Conference on Industrial Electronics
    p. 1-7
    Presentation's date: 2012-10
    Presentation of work at congresses

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

    The modular multilevel converter (MMC) is one of the most potential converter topologies for medium/high power/voltage applications. One of the main technical challenges of an MMC is to eliminate/minimize the circulating currents within the legs. Circulating currents, if not properly controlled, increase the amplitude of capacitor voltage variations, rating values of the converter components and converter losses. This paper proposes a closed-loop circulating current control strategy for an MMC to specifically minimize the amplitude of capacitor voltage variations. The proposed strategy is based on adding an offset signal to the modulating signal of each arm. To minimize the amplitude of the capacitor voltage oscillations, an optimal circulating current component is determined and used as a reference signal for the current control of each MMC leg. Performance of the proposed control strategy is evaluated based on simulation studies in the MATLAB/Simulink environment. The reported study results demonstrate effectiveness of the proposed strategy to reduce the amplitude of the capacitor voltage oscillations.

  • Solid State Transformer Based on the Flying Capacitor Multilevel Converter for Intelligent Power Management

     Ghias, Amer M.Y.M; Ciobotaru, M.; Agelidis, Vassilios; Pou Felix, Josep
    IEEE PES Power Systems Conference and Exposition
    p. 1-7
    DOI: 10.1109/PowerAfrica.2012.6498659
    Presentation's date: 2012-07
    Presentation of work at congresses

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

    Future grids will consist of large scale of integration of both renewable and other distributed energy sources. Therefore, advanced power electronics converters for critical loads will be needed in order to enhance power quality, and to ensure proper and secure operation of future grids. These power converters must be able to provide intelligent power management as well as ancillary services. This paper proposes a solid state transformer (SST) which consists of medium frequency transformer and three-level flying capacitor (FC) topology for intelligent power management. It is tested under various grid events such as voltage excursions, phase jumps and frequency variations. Moreover, it is tested against load disturbances such as load transients and non-linear loads. The SST enhances power quality compatibility and provides good isolation of perturbances between the grid and the loads. The SST is also able to deliver ride through capabilities, which can isolate short term disturbances from the grid to the loads and vice-versa. The Power quality enhancement features are validated under various source and load conditions using computer simulation.

    Future grids will consist of large scale of integration of both renewable and other distributed energy sources. Therefore, advanced power electronics converters for critical loads will be needed in order to enhance power quality, and to ensure proper and secure operation of future grids. These power converters must be able to provide intelligent power management as well as ancillary services. This paper proposes a solid state transformer (SST) which consists of medium frequency transformer and threelevel flying capacitor (FC) topology for intelligent power management. It is tested under various grid events such as voltage excursions, phase jumps and frequency variations. Moreover, it is tested against load disturbances such as load transients and nonlinear loads. The SST enhances power quality compatibility and provides good isolation of perturbances between the grid and the loads. The SST is also able to deliver ride through capabilities, which can isolate short term disturbances from the grid to the loads and vice-versa. The Power quality enhancement features are validated under various source and load conditions using computer simulation.

  • Estudi de viabilitat d'implentació d'energies renovables a través de microxarxes en els pobles del Pirineu (RURALGRID)

     Hervada Sala, Carme; Arias Pujol, Antoni; Jaen Fernandez, Carlos; Capella Frau, Gabriel Jose; Zaragoza Bertomeu, Jordi; Pou Felix, Josep
    Competitive project

     Share

  • Performance evaluation of a five-level flying capacitor converter with reduced DC bus capacitance under two different modulation schemes

     Ghias, Amer M.Y.M; Pou Felix, Josep; Ciobotaru, M.; Agelidis, Vassilios
    IEEE International Symposium on Power Electronics for Distributed Generation Systems
    p. 857-864
    DOI: 10.1109/PEDG.2012.6254101
    Presentation's date: 2012
    Presentation of work at congresses

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

    In flying capacitor (FC) converters, phase-shifted pulse-width modulation (PS-PWM) provides natural voltage balancing. However, for a practical application, a more robust balancing mechanism of maintaining the FC voltages at the desired values is required. This paper proposes a new closed-loop voltage balancing method for multilevel FC converters using PSPWM. The proposed method balances the voltages of the FCs by modifying the duty cycle of each switch of the FC converter using a proportional (P) controller. The crossed effect between FC currents and duty cycles is considered and is used for FC voltage balancing. The Simulation results verify that the proposed voltage balancing method is very robust to different operating conditions, such as load transients and non-linear loads.

  • Dynamic behaviour of a back-to-back five-level flying capacitor converter with reduced DC bus capacitance

     Ghias, Amer M.Y.M; Ciobotaru, M.; Agelidis, Vassilios; Pou Felix, Josep
    IEEE Energy Conversion Congress and Exposition
    p. 1741-1746
    DOI: 10.1109/IPEMC.2012.6259099
    Presentation's date: 2012
    Presentation of work at congresses

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

    Due to extensive research, advanced voltage source converter (VSC) such as multilevel and multi-module have been proposed for high power applications. These advanced VSCs must provide secure as well as, intelligent power management operation for the future electricity network under various grid events. The focus of this paper is to evaluate the dynamic performance of a back-to-back five-level flying capacitor (FC) converter system with reduced DC bus capacitance under different grid voltage disturbances. The system uses a classical synchronous reference frame control technique for active/reactive power control and DC voltage regulation, and is tested in terms of general grid events such as power flow reversal, voltage amplitude excursions, phase jumps and frequency variations using MATLAB/Simulink and PLECS blockset. The simulation results show that the back-to-back FC converter with reduced DC bus capacitance performs well during the mentioned grid events.

  • Access to the full text
    Analysis of voltage balancing limits in modular multilevel converters  Open access

     Ceballos Recio, Salvador; Pou Felix, Josep; Choi, Sanghun; Saeedifard, Maryam; Agelidis, Vassilios
    Annual Conference of the IEEE Industrial Electronics Society
    p. 4397-4402
    Presentation's date: 2011-11-08
    Presentation of work at congresses

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

    The modular multilevel converter (MMC) is one of the most promising converter topologies for high-voltage applications, especially for high-voltage direct-current (HVDC) transmission systems. One of the most challenging issues associated with the MMC is the capacitor voltage variations, which if not properly controlled, result in large circulating currents flowing through the converter legs. This paper develops a mathematical model to formulate and analyze capacitor voltage variations and the circulating currents within the MMC legs. Based on the developed model, the limits to the capacitor voltage balancing task are derived and graphically presented. A set of simulation results conducted in MATLAB/Simulink environment are presented to verify the accuracy of the mathematical analysis.

  • MODULATION STRATEGIES FOR THE NEUTRAL-POINT-CLAMPED CONVERTER AND CONTROL OF A WIND TURBINE SYSTEM  Open access

     Zaragoza Bertomeu, Jordi
    Department of Electronic Engineering, Universitat Politècnica de Catalunya
    Theses

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

    Els convertidors multinivell són topologies de convertidors d’electrònica de potència que poden generar tres o més nivells de voltatge en cadascuna de les fases de sortida. Com a resultat, els voltatges i corrents generats per aquestes topologies presenten una distorsió harmònica baixa. Hi ha diferents configuracions de convertidors multinivell, les quals es basen en connectar dispositius de potència o convertidors en sèrie. El resultat d’aquestes connexions permet obtenir voltatges alts, tant en la part de corrent continu com en la de corrent altern del convertidor. A més, cada dispositiu sols ha de suportar una fracció del voltatge total del bus de corrent continu. Per aquestes raons, els convertidors multinivell són generalment utilitzats en aplicacions d’alta potència. El convertidor de tres nivells amb connexió a punt neutre (neutral-point-clamped) és el més utilitzat. La recerca d’aquesta tesis doctoral està focalitzada en aquesta topologia de convertidor, i el principal objectiu és l’aportació de noves tècniques de modulació. Aquestes tenen en compte diferents aspectes: la velocitat computacional dels algorismes, l’equilibrat de les tensions dels condensadors del bus de contínua, les pèrdues de commutació i les oscil·lacions de baixa freqüència en el punt neutre del convertidor. Totes les estratègies de modulació proposades en aquesta tesis són modulacions d’amplada de polses basades en portadora. En la primera modulació que es presenta, s’injecta un senyal comú (seqüència zero) a totes les moduladores, que es basa en els patrons de la modulació vectorial que utilitza tres vectors dels més propers al de referència (nearest-three-vector modulation). S’estudien i es comparen els resultats d’aquesta modulació amb la seva homòloga, basada en perspectiva vectorial. Una segona proposta és l’anomenada modulació d’amplada de polses de doble senyal (double-signal pulse-width modulation). Aquesta modulació és capaç d’eliminar completament les oscil·lacions de voltatge en el punt neutre del convertidor. No obstant això, es produeix un increment de les pèrdues de commutació en els dispositius de potència i, a més, no hi ha un equilibrat natural de les tensions en els condensadors del bus. Una última estratègia de modulació, anomenada modulació híbrida (hybrid pulse-width modulation), es basa en la combinació de la modulació sinusoïdal (sinusoidal pulse-width modulation) i la de doble senyal. Aquesta presenta una solució de compromís entre reduir les pèrdues de commutació, en detriment d’un augment de l’amplitud de les oscil·lacions de voltatge en el punt neutre. Una segona part d’aquesta tesis es centra en les aplicacions a generació eòlica, ja que els convertidors multinivell estan començant a ser utilitzats en aquest camp. Això es produeix fonamentalment per l’augment continu de les dimensions de les turbines eòliques. En aquesta part de la recerca s’ha considerat la configuració de dos convertidors multinivell connectats a un mateix bus de contínua (back-to-back), tot i que els convertidors han estat estudiats independentment. Inicialment s’ha estudiat el convertidor que va connectat a la xarxa elèctrica i s’ha aplicat l’estratègia de control coneguda com a control orientat a tensió (voltage-oriented control). S’han utilitzat controladors estàndard (proporcional-integral), als quals s’ha afegit un control difús que supervisa i modifica els valors de les constants dels controladors. Aquest supervisor difús millora la dinàmica de la tensió del bus de contínua davant canvis de càrrega quan el convertidor treballa com a rectificador. Per una altra part, s’ha estudiat el control d’una turbina eòlica basada en un generador d’imants permanents. En aquest cas, s’ha aplicat l’estratègia de control coneguda com a control orientat a camp (field-oriented control). S’han avaluat i comparat els avantatges i inconvenients de diferents formes de sintonitzar els controladors.

    Multilevel converters are power electronic topologies that can generate three or more voltage levels in each output phase. As a result, the voltage and current waveforms generated have lower total harmonic distortion. Multilevel topologies are based on connecting power devices or converters in a series. Consequently, high voltages can be handled on the dc and ac sides of the converter, while each device stands only a fraction of the total dc-link voltage. For these reasons multilevel converters are generally applied to high-power applications. The three-level neutral-point-clamped converter is the most extensively used multilevel topology. This topology is the main focus of research in this dissertation. The main objective is to propose new modulation strategies that are able to meet a compromise solution while considering computational algorithm speed, voltage balance in the dc-link capacitors, switching losses and low frequency voltage oscillations at the neutral point. All the modulation strategies proposed here are based on carrier-based pulsewidth modulation. A new modulation strategy has been implemented using a proper zero-sequence signal injected into the modulation signals. The zero sequence is determined from a space-vector modulation standpoint, particularly the nearest-threevector modulation strategy. The proposed carrier-based technique is compared with its space-vector modulation counterpart. It shows some advantages, such as easier implementation and reduced switching events; however, it still produces oscillations in the neutral-point voltage for some operating conditions. A new modulation strategy able to completely remove such voltage oscillations is also presented. It is called double-signal pulse-width modulation. The main drawback of this strategy is that it increases the switching frequency of the power devices and has no natural capacitor voltage balance. Some balancing strategies are proposed in this dissertation for this specific modulation. Furthermore, a hybrid pulse-width modulation approach is presented which is able to combine sinusoidal pulse-width modulation with doublesignal pulse-width modulation; this represents a compromise solution between switching losses and neutral-point voltage oscillation amplitudes. The second part of this thesis is focused on wind generation applications. Multilevel converters are starting to be used in such a field nowadays, and are expected to be further applied in the near future as the sizes of wind turbines grow. Two back-toback-connected power converters are considered in this application, although they are analyzed independently. First of all, the control of the grid-connected converter is studied. A voltage-oriented control is used with standard proportional-integral controllers. The originality of the method is that a fuzzy supervisor is designed and included in the structure; the fuzzy supervisor is able to modify the proportionalintegral parameters online. It is shown how the control of the total dc-link voltage improves significantly under load changes when the converter is working as a rectifier. On the other hand, a control study is performed on the wind turbine side. The variable speed wind turbine is based on a permanent magnet synchronous generator. A field-oriented control strategy is applied. The controllers are evaluated and compared using different tuning strategies which highlight the advantages and drawbacks of each.

  • Capacitor voltage balance limits in a multilevel-converter-based energy storage system

     Burusteta, Sendoa; Pou Felix, Josep; Ceballos Recio, Salvador; Marino, Iker; Alzola, José Ángel
    European Conference on Power Electronics and Applications
    p. 1-9
    Presentation's date: 2011-08-30
    Presentation of work at congresses

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

  • An approach on how to use audiovisual resources at Engineering Higher Education

     Corbalán Fuertes, Montserrat; Aldabas Rubira, Emiliano; Pou Felix, Josep; Zaragoza Bertomeu, Jordi; Plaza García, Inmaculada
    Conferencia Internacional de Fomento e Innovación con Nuevas Tecnologías en la Docencia de la Ingeniería
    p. 361-364
    DOI: 10.1109/FINTDI.2011.5936411
    Presentation's date: 2011-05
    Presentation of work at congresses

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

  • Access to the full text
    Parallel-connected legs in a grid-tied inverter system for distributed generation  Open access

     Capella Frau, Gabriel Jose; Pou Felix, Josep; Zaragoza Bertomeu, Jordi; Ceballos Recio, Salvador; Gabiola Antxustegi, Igor; Robles Sestafe, Eider
    International Conference on Renewable Energies and Power Quality
    p. 1-6
    Presentation's date: 2011-04-13
    Presentation of work at congresses

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

    Grid-connected high-power inverters are often used in distributed generation and power quality systems. Those inverters have to handle high currents in order to achieve high power values without resorting to higher voltages. Connecting inverter legs in parallel is a proper way to achieve such high currents. Such parallel connection is made by means of inductors and achieving balanced currents among the legs becomes a critical issue. Circulating currents may produce additional losses and stress to the converter’s power devices. Therefore, they should be controlled and minimized. An efficient technique to achieve such balance is presented in this paper. The proposed strategy has been developed on a gridconnected three-phase system. Each phase of the inverter is made up of three legs in parallel. Besides, the control implemented in this work allows full regulation of the power factor. This way, any desired power factor value can be achieved in order to meet grid-connection requirements. Simulation and experimental results are shown in this paper.

  • Free software tools in electronic design: a search and a preliminary selection

     Medrano Sánchez, Carlos; Plaza García, Inmaculada; Castro Gil, Manuel Alonso; García Sevilla, Francisco; Martínez Calero, J.D.; Pou Felix, Josep; Corbalán Fuertes, Montserrat
    IEEE MOS-AK/GSA ESSDERC/ESSCIRC Workshop
    Presentation's date: 2010-09-17
    Presentation of work at congresses

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

  • Grid connection and control of multipole synchronous wind turbines

     Robles Sestafe, Eider
    Department of Electrical Engineering, University of the Basque Country
    Theses

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

  • A review of electronic engineering design free software tools

     Medrano Sánchez, Carlos; Plaza García, Inmaculada; Castro Gil, Manuel Alonso; García Sevilla, Francisco; Martínez Calero, J.D.; Pou Felix, Josep; Corbalán Fuertes, Montserrat
    IEEE Education Engineering
    p. 1867-1871
    DOI: 10.1109/EDUCON.2010.5492430
    Presentation's date: 2010-04-16
    Presentation of work at congresses

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

    In this paper, we review electronic design free software tools. We have searched open source programs that help with several tasks of the electronic design flow: analog and digital simulation, schematic capture, printed circuit board design and hardware description language compilation and simulation. Using some rapid criteria for verifying their availability, we have selected some of them which are worth working with. This work intends to perform a deeper analysis of free software tools and select some of them to use in education or in professional electronic design.

  • Consecuencias de la integración de turbinas eólicas en la red de distribución y de transporte eléctricos

     Jaen Fernandez, Carlos; Arias Pujol, Antoni; Zaragoza Bertomeu, Jordi; Hervada Sala, Carme; Gonzalez Diez, David; Capella Frau, Gabriel Jose; Pou Felix, Josep
    Competitive project

     Share

  • Access to the full text
    Current balancing strategy in parallel-connected legs of power inverters  Open access

     Pou Felix, Josep; Zaragoza Bertomeu, Jordi; Capella Frau, Gabriel Jose; Gabiola Antxustegi, Igor; Ceballos Recio, Salvador; Robles Sestafe, Eider
    European Conference on Power Electronics and Applications
    p. 1-9
    Presentation's date: 2009-09-10
    Presentation of work at congresses

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

    The parallel connection of inverter legs is a way to increase the output currents and thus the converter rated power. The connection is made by inductors and a critical issue is to achieve balanced currents among the legs. Circulating currents produce additional losses and stress to the power devices of the converter. Therefore, they should be controlled and minimized. An efficient technique to achieve such a balance is presented in this paper. The proposed strategy does not include proportional-integral (PI) controllers and parameter tuning is not required. The exact control action to achieve current balance is straightforward calculated and applied. Simulation and experimental results are shown in this paper to verify efficiency of the proposed balancing method.

    Postprint (author’s final draft)

  • Access to the full text
    Grid sequence detector based on a stationary reference frame  Open access

     Robles Sestafe, Eider; Pou Felix, Josep; Ceballos Recio, Salvador; Gabiola Antxustegi, Igor; Santos, Maider
    European Conference on Power Electronics and Applications
    p. 1-10
    Presentation's date: 2009-09-09
    Presentation of work at congresses

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

    This paper proposes a new three-phase positive sequence detector. The scheme is based on a stationary reference frame and a Moving Average Filter (MAF) that guarantees the complete cancellation of harmonics and grid imbalances. The performance of the MAF is mathematically analyzed and a proper selection of the optimal filter’s window width is realized. The proposed detector operates in open loop and there is no PI controller to be tuned. Thus, the dynamic response and simplicity is improved compared to other solutions. Performance of the proposed detector is verified through simulation and experiment. It shows very good performance under extreme grid voltage conditions, allowing fast detection of the grid voltage positive sequence (within one grid voltage cycle).

  • On the use of sun trackers to improve maximum power point tracking controllers applied to photovoltaic systems

     Jaen Fernandez, Carlos; Pou Felix, Josep; Capella Frau, Gabriel Jose; Arias Pujol, Antoni; Lamich Arocas, Manuel
    Compatibilty and Power Electronics
    p. 1-6
    Presentation's date: 2009-05
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • PSE-370000-2009-23 (AVANZA)

     Zaragoza Bertomeu, Jordi; Arias Pujol, Antoni; Pou Felix, Josep
    Competitive project

     Share

  • PSE-370000-2009-22 (AVANZA)

     Zaragoza Bertomeu, Jordi; Jaen Fernandez, Carlos; Arias Pujol, Antoni; Pou Felix, Josep
    Competitive project

     Share

  • Model, design, analysis and state-of-the-art control from the blowing wind to the sinusoidal voltages and currents

     Jarauta Bragulat, Eusebio; Pou Felix, Josep; Pindado Rico, Rafael; Jaen Fernandez, Carlos; Arias Pujol, Antoni; Zaragoza Bertomeu, Jordi; Hervada Sala, Carme; Buenestado Caballero, Pablo; Ortega, C
    Date of publication: 2008-09
    Book chapter

     Share Reference managers Reference managers Open in new window

  • Plataforma de simulación modular de auto-aprendizaje de sistemas de generación eólica

     Pou Felix, Josep; Zaragoza Bertomeu, Jordi; Arias Pujol, Antoni; Robles Sestafe, Eider; Ceballos Recio, Salvador; Ibañez, Pedro; Jaen Fernandez, Carlos; Corbalán Fuertes, Montserrat; Pindado Rico, Rafael
    Congreso de Tecnologías Aplicadas a la Enseñanza de la Electrónica
    p. 1-9
    Presentation's date: 2008-07-04
    Presentation of work at congresses

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

  • Del reto al proyecto una nueva experiencia docente en el marco del Espacio Europeo de Educacion Superior

     Jaen Fernandez, Carlos; Hervada Sala, Carme; Lamich Arocas, Manuel; Corbalán Fuertes, Montserrat; Pou Felix, Josep; Arias Pujol, Antoni
    Congreso de Tecnologías Aplicadas a la Enseñanza de la Electrónica
    Presentation's date: 2008-07-02
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window