Now showing items 1-19 of 19

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

    Darus, Rosheila; Pou Félix, Josep; Konstantinou, Georgios; Ceballos Recio, Salvador; Agelidis, Vassilios (2014)
    Conference report
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    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 ...
  • A three-phase frequency-adaptive phase-locked loop for independent single-phase operation 

    Mirhosseini, Mitra; Pou Félix, Josep; Agelidis, Vassilios; Robles Sestafe, Eider; Ceballos Recio, Salvador (2014-12-01)
    Article
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    This letter proposes a phase-locked loop (PLL) able to operate as an independent single-phase PLL in the context of three-phase systems. Its key advantage is that the extracted information allows the independent control ...
  • Active redundant submodule configuration in modular multilevel converters 

    Konstantinou, Georgios; Pou Félix, Josep; Ceballos Recio, Salvador; Agelidis, Vassilios (2013-09)
    Article
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    The modular multilevel converter (MMC) is based on the cascaded connection of identical submodules (SMs) enabling additional redundancies. This paper proposes the configuration of the MMC topology with redundant SMs and ...
  • Analysis of voltage balancing limits in modular multilevel converters 

    Ceballos Recio, Salvador; Pou Félix, Josep; Choi, Sanghun; Saeedifard, Maryam; Agelidis, Vassilios (IEEE, 2011)
    Conference report
    Open Access
    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 ...
  • Capacitor voltage balance limits in a multilevel-converter-based energy storage system 

    Burusteta, Sendoa; Pou Félix, Josep; Ceballos Recio, Salvador; Marino, Iker; Alzola, José Ángel (2011)
    Conference report
    Open Access
    This paper studies an energy storage system based on a three-level DC-DC converter and a gridconnected neutral-point-clamped inverter. The main advantages of this multilevel power conversion system are highlighted and ...
  • Circulating current control and evaluation of carrier dispositions in modular multilevel converters 

    Darus, Rosheila; Pou Félix, Josep; Konstantinou, Georgios; Ceballos Recio, Salvador; Agelidis, Vassilios (2013)
    Conference report
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    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 ...
  • Comparison of phase-shifted and level-shifted PWM in the modular multilevel converter 

    Darus, Rosheila; Konstantinou, Georgios; Pou Félix, Josep; Ceballos Recio, Salvador; Agelidis, Vassilios (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Conference report
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    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 ...
  • Control strategy to balance operation of parallel connected legs of modular multilevel converters 

    Pou Félix, Josep; Ceballos Recio, Salvador; Konstantinou, Georgios; Capellá Frau, Gabriel José; Agelidis, Vassilios (2013)
    Conference report
    Open Access
    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 ...
  • Efficiency optimization in low inertia wells turbine-oscillating water column devices 

    Ceballos Recio, Salvador; Rea, Judy; López, Iraide; Pou Félix, Josep; Robles Sestafe, Eider; Osullivan, Dara (2013-09)
    Article
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    The Wells turbine is a bidirectional air turbine which operates efficiently over a restricted range of air flow. The optimization of its efficiency requires control of rotational velocity in order to maintain the ratio ...
  • Grid sequence detector based on a stationary reference frame 

    Robles Sestafe, Eider; Pou Félix, Josep; Ceballos Recio, Salvador; Gabiola, Igor; Santos, Maider (2010-06)
    Article
    Open Access
    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 ...
  • Minimization of the capacitor voltage fluctuations of a modular multilevel converter by circulating current control 

    Picas Prat, Ricard; Pou Félix, Josep; Ceballos Recio, Salvador; Agelidis, Vassilios; Saeedifard, Maryam (2012)
    Conference report
    Open Access
    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 ...
  • Optimal injection of harmonics in circulating currents of modular multilevel converters for capacitor voltage ripple minimization 

    Picas Prat, Ricard; Pou Félix, Josep; Ceballos Recio, Salvador; Zaragoza Bertomeu, Jordi; Konstantinou, Georgios; Agelidis, Vassilios (2013)
    Conference report
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    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 ...
  • Parallel-connected legs in a grid-tied inverter system for distributed generation 

    Capellá Frau, Gabriel José; Pou Félix, Josep; Zaragoza Bertomeu, Jordi; Ceballos Recio, Salvador; Gabiola, Igor; Robles Sestafe, Eider (2011)
    Conference lecture
    Open Access
    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 ...
  • PWM algorithm with adaptive offset for three-level multi-phase neutral-point-clamped converters 

    López, Iraide; Ceballos Recio, Salvador; Andreu, Jon; Kortabarria, Iñigo; Pou Félix, Josep (2013)
    Conference report
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    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 ...
  • SiC modular multilevel converters: sub-module voltage ripple analysis and efficiency estimations 

    Perez Basante, Angel; Pou Félix, Josep; Ceballos Recio, Salvador; Gil De Muro, Asier; Pujana, Ainhoa; Ibañez, Pedro (2014)
    Conference report
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    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 ...
  • Study and experimental verification of control tuning strategies in a variable speed wind energy conversion system 

    Zaragoza Bertomeu, Jordi; Pou Félix, Josep; Arias Pujol, Antoni; Spiteri, Cyril; Robles Sestafe, Eider; Ceballos Recio, Salvador (2011-05)
    Article
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    This paper analyzes and compares different control tuning strategies for a variable speed wind energy conversion system (WECS) based on a permanent-magnet synchronous generator (PMSG). The aerodynamics of the wind turbine ...
  • Survey on fault operation on multilevel inverters 

    Lezana, Pablo; Pou Félix, Josep; Meynard, Thierry A.; Rodríguez, José; Ceballos Recio, Salvador; Richardeau, Frédéric (2010-07-01)
    Article
    Open Access
    This paper is related to faults that can appear in multilevel (ML) inverters, which have a high number of components. This is a subject of increasing importance in high-power inverters. First, methods to identify a fault ...
  • Variable-Frequency Grid-Sequence Detector Based on a Quasi-Ideal Low-Pass Filter Stage and a Phase-Locked Loop 

    Robles Sestafe, Eider; Ceballos Recio, Salvador; Pou Félix, Josep; Martin, Jose Luis; Zaragoza Bertomeu, Jordi; Ibáñez, P. (2010-09)
    Article
    Open Access
    This paper proposes a filtered-sequence phase-locked loop (FSPLL) structure for detection of the positive sequence in three-phase systems. The structure includes the use of the Park transformation and moving average ...
  • Varying and unequal carrier frequency PWM techniques for modular multilevel converters 

    Konstantinou, Georgios; Darus, Rosheila; Pou Félix, Josep; Ceballos Recio, Salvador; Agelidis, Vassilios (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Conference report
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    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 ...