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1 to 50 of 92 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

  • Harmonic compensation analysis in offshore wind power plants using hybrid filters

     Hasan, Khurshid N Md; Kalle, Rauma; Luna Alloza, Alvaro; Candela Garcia, Jose Ignacio; Rodriguez Cortes, Pedro
    IEEE transactions on industry applications
    Date of publication: 2014-05-16
    Journal article

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    The harmful effects of harmonics are an important issue in wind power plants (WPPs), especially in offshore applications. In offshore WPPs, the wind turbines are linked to the network through high-power converters that produce harmonics at relative low frequencies. Moreover, in the network of a WPP, the propagation of noncharacteristic harmonics and the effect of resonance contribute as well in boosting the harmonic distortion. In this paper, a solution for compensating the harmonics in a WPP by means of using hybrid filters is proposed. In this paper, not only the filtering solution is tested, but also a method for finding the best place where to connect the filter, based on a modal analysis or a harmonic modal resonance analysis, is implemented. The proposed solution has been tested by considering the model of a real 400-MW offshore WPP as the study case. As it will be shown, the hybrid filter is capable of damping the resonances in the plant, while the analysis conducted permits us to optimize its location in the plant

  • Analysis on capability of harmonic damping using active filter acting as resistive harmonic impedance

     Hasan, Khurshid N Md; Luna Alloza, Alvaro; Candela Garcia, Jose Ignacio; Rodriguez Cortes, Pedro
    IEEE Annual International Energy Conversion Congress and Exhibition for the Asia/Pacific
    Presentation's date: 2013-09
    Presentation of work at congresses

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    This paper presents the analysis of shunt active filter (SAF) in harmonic damping. SAF with voltage-based detection control act as an active damping and able to attenuate harmonic propagation throughout the power distribution network. The active filter is implemented on two different power line networks to assess its practicality in different network configuration. The first network is 220-V distribution power line and the second network is the reduced equivalent WPP network of 150-kV, 444.4-MVA. Assessment on the best place for active filter implementation is supported by using harmonic resonance mode analysis method.

    This paper presents the analysis of shunt active filter (SAF) in harmonic damping. SAF with voltage-based detection control act as an active damping and able to attenuate harmonic propagation throughout the power distribution network. The active filter is implemented on two different power line networks to assess its practicality in different network configuration. The first network is 220-V distribution power line and the second network is the reduced equivalent WPP network of 150-kV, 444.4-MVA. Assessment on the best place for active filter implementation is supported by using harmonic resonance mode analysis method.

  • Analysis of ferroresonance effects in distribution networks with distributed source units

     Monadi, Mehdi; Luna Alloza, Alvaro; Candela Garcia, Jose Ignacio; Rocabert Delgado, Joan; Fayezizadeh, Mostafa; Rodriguez Cortes, Pedro
    Annual Conference of the IEEE Industrial Electronics Society
    Presentation's date: 2013-11-13
    Presentation of work at congresses

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    The connection of Distributed Generation (DG) units to existing networks may give rise to harmful effects on the network and the DG units itself. Therefore, due to increasing penetration of DG units, it is important to consider these effects in order to avoid some of harmful events. Ferroresonance is one of these destructive phenomena. Over voltages due to this phenomena can damage devices which are connected to the network. In DG systems, due to the use of capacitor banks which are used for VAR compensation, grid connection filters, etc. ferroresonance may appear. Also, special operations like islanding, may lead these systems to ferroresonance. In traditional systems ferroresonance normally appear after there is an unbalance in the system. Nevertheless, for networks with significant penetration of DG units, the situation that gives rise to ferroresonance may be different from traditional systems and they can happen without any unbalancing occurrence. In this paper a distribution system integrating wind (WT) and photovoltaic (PV) power systems has been evaluated in order to analyze the performance of ferroresonance in such systems. Finally, the most appropriate techniques to prevent its appearance, and the associated over voltages, have been studied and implemented using PSCAD/EMTDC.

  • Modeling and control of multi modular converters using optimal LQR controller with integral action

     Rakhshani, Elyas; Mir Cantarellas, Antonio; Remón, D.; Rodriguez Cortes, Pedro; Candela Garcia, Jose Ignacio
    IEEE Energy Conversion Congress and Exposition
    Presentation's date: 2013-09
    Presentation of work at congresses

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    A new application of LQR controller with the ability of reference tracking for a multi modular converter with several cells is proposed. First, the mathematical model for the grid connected MMC is presented and then, the small signal state space model is obtained. MMC is a very complex MIMO system with several state variables and global control for this system is very important issue. Optimal advanced controller based on linear quadratic regulator with integral action is a very good candidate for controlling the AC signals and energy balancing in multi cells MMC system. The performance and validity of obtained model and designed linear controller are evaluated with non-linear model of MMC in SimPower System toolbox/Matlab. Simulation results are verified the excellent performance of the proposed approach in the transient and steady state operational conditions.

    A new application of LQR controller with the ability of reference tracking for a multi modular converter with several cells is proposed. First, the mathematical model for the grid connected MMC is presented and then, the small signal state space model is obtained. MMC is a very complex MIMO system with several state variables and global control for this system is very important issue. Optimal advanced controller based on linear quadratic regulator with integral action is a very good candidate for controlling the AC signals and energy balancing in multi cells MMC system. The performance and validity of obtained model and designed linear controller are evaluated with non-linear model of MMC in SimPower System toolbox/Matlab. Simulation results are verified the excellent performance of the proposed approach in the transient and steady state operational conditions.

  • Adaptive droop for primary control in MTDC networks with energy storage

     Gavriluta, Catalin; Candela Garcia, Jose Ignacio; Luna Alloza, Alvaro; Rocabert Delgado, Joan; Rodriguez Cortes, Pedro
    European Conference on Power Electronics and Applications
    Presentation's date: 2013-09-06
    Presentation of work at congresses

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    Multi-terminal DC (MTDC) systems are drawing a lot of interest lately in applications related to distributed generation, especially in those that integrate wind or PV systems together with energy storage. This paper proposes an improved strategy for the primary control of MTDC integrating energy storage (ES) units. The concept is based on the combination of a droop control method and dc-bus signaling in order to provide a generic approach to be used as basis for a hierarchical control structure in a multi-point DC-bus system. The proposed method considers the State of Charge (SoC) of the energy storage system at the primary control level, yielding a surface characteristic for a droop control that depends both on the SoC and the dc bus voltage. Finally, a method for designing and tuning the system is proposed and analyzed theoretically and through simulations and experiments on a 10kVA system with energy storage.

    Multi-terminal DC (MTDC) systems are drawing a lot of interest lately in applications related to distributed generation, especially in those that integrate wind or PV systems together with energy storage. This paper proposes an improved strategy for the primary control of MTDC integrating energy storage (ES) units. The concept is based on the combination of a droop control method and dc-bus signaling in order to provide a generic approach to be used as basis for a hierarchical control structure in a multi-point DC-bus system. The proposed method considers the State of Charge (SoC) of the energy storage system at the primary control level, yielding a surface characteristic for a droop control that depends both on the SoC and the dc bus voltage. Finally, a method for designing and tuning the system is proposed and analyzed theoretically and through simulations and experiments on a 10kVA system with energy storage.

  • A hierarchical control structure for multi-terminal VSC-based HVDC grids with GVD characteristics

     Rouzbehi, Kumars; Miranian, Arash; Candela Garcia, Jose Ignacio; Luna Alloza, Alvaro; Rodriguez Cortes, Pedro
    IEEE International Conference on Renewable Energy Research and Applications
    Presentation's date: 2013-10-20
    Presentation of work at congresses

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    This paper presents a hierarchical control structure for Multi terminal HVDC grids. The hierarchical control structure is inspired by the three-layer control structure of largescale AC power systems and it is divided into primary, secondary and tertiary control. This structure permits to create an easy interaction between power dispatch and the lower controllers. Moreover, a generalized voltage droop (GVD) characteristic is also proposed which facilitates control issues inside the Multi terminal HVDC grids. In the proposed control structure, the coefficients of the GVD characteristics are set based on the solution of a DC power flow algorithm, executed in the secondary control level.

  • Control of PV generation systems using the synchronous power controller

     Rodriguez Cortes, Pedro; Candela Garcia, Jose Ignacio; Luna Alloza, Alvaro
    IEEE Energy Conversion Congress and Exposition
    Presentation's date: 2013-09
    Presentation of work at congresses

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    The high penetration of distributed generation, as PV or wind power, has forced the Transmission System Operators (TSOs) to set restrictive requirements for the operation of such systems. As it can be extracted from the forthcoming grid codes drafts, the future distributed generation systems will be requested to have the equivalent performance of a synchronous generator, which is seen from the TSOs as the only solution if a massive integration of renewable in the electrical network should be achieved. In this paper a method for controlling PV grid connected power converters as a synchronous generator, namely Synchronous Power Controller (SPC), is presented. As a difference with previous works this method permits to take advantage of emulating the synchronous behavior meanwhile it is able to get rid of its drawbacks. The main concept of the SPC, as well as some simulation and experimental results will be shown in this paper considering a PV power plant as a study case.

    The high penetration of distributed generation, as PV or wind power, has forced the Transmission System Operators (TSOs) to set restrictive requirements for the operation of such systems. As it can be extracted from the forthcoming grid codes drafts, the future distributed generation systems will be requested to have the equivalent performance of a synchronous generator, which is seen from the TSOs as the only solution if a massive integration of renewable in the electrical network should be achieved. In this paper a method for controlling PV grid connected power converters as a synchronous generator, namely Synchronous Power Controller (SPC), is presented. As a difference with previous works this method permits to take advantage of emulating the synchronous behavior meanwhile it is able to get rid of its drawbacks. The main concept of the SPC, as well as some simulation and experimental results will be shown in this paper considering a PV power plant as a study case.

  • Comprehensive analogy between conventional AC grids and DC grids characteristics

     Rouzbehi, Kumars; Gavriluta, Catalin; Candela Garcia, Jose Ignacio; Luna Alloza, Alvaro; Rodriguez Cortes, Pedro
    Annual Conference of the IEEE Industrial Electronics Society
    Presentation's date: 2013-11-13
    Presentation of work at congresses

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    The high penetration of renewable energy resources, such as wind and photovoltaic, as well as the development of power electronics devices play an important role in the development of DC grids. However, the evolution of DC-systems from point-to-point connections to `Multi-terminal¿ DC (MTDC) networks is not so straight forward. At the current moment there is a large gap in the literature concerning the dynamics, control and operation of MTDC networks. On the other hand, conventional AC networks have been studied exhaustively in the past decades providing for a rich inspiration source. In this paper we are going to establish a comprehensive analogy between the characteristics of conventional AC grids and the emerging DC grids. The key similarities and differences between the two types of grids are identified in an attempt to better understand the characteristics and behavior of DC grids. In the end, the extent to which concepts like planning for operation and control of AC grids can be conveniently extrapolated to DC grids is evaluated.

    The high penetration of renewable energy resources, such as wind and photovoltaic, as well as the development of power electronics devices play an important role in the development of DC grids. However, the evolution of DC-systems from point-to-point connections to ‘Multi-terminal’ DC (MTDC) networks is not so straight forward. At the current moment there is a large gap in the literature concerning the dynamics, control and operation of MTDC networks. On the other hand, conventional AC networks have been studied exhaustively in the past decades providing for a rich inspiration source. In this paper we are going to establish a comprehensive analogy between the characteristics of conventional AC grids and the emerging DC grids. The key similarities and differences between the two types of grids are identified in an attempt to better understand the characteristics and behavior of DC grids. In the end, the extent to which concepts like planning for operation and control of AC grids can be conveniently extrapolated to DC grids is evaluated.

  • Control of grid-connected power converters based on a virtual admittance control loop

     Rodriguez Cortes, Pedro; Candela Garcia, Jose Ignacio; Citro, Costantino; Rocabert Delgado, Joan; Luna Alloza, Alvaro
    European Conference on Power Electronics and Applications
    Presentation's date: 2013-09-06
    Presentation of work at congresses

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    The connection of electronic power converters to the electrical network is increasing mainly due to massive integration of renewable energy systems. However, the electrical dynamic performance of these converters does not match the behavior of the network, which is mainly formed by generation facilities based on big synchronous generation systems. Depending on the desired electrical operation mode different control structures can be implemented in the converters in order to get adapted with the grid conditions. However, changing between different control structures and operation is not an optimal solution, as the resulting system results complex and is not highly robust. As an alternative, this paper presents a new control technique for grid connected power converters based on the concept of virtual admittance. The proposed control permits to emulate the electrical performance of generation facilities based on classical synchronous generators with a power converter, with no need of implementing different control structures, giving rise to a system that provides a friendly and robust operation with the network.

    The connection of electronic power converters to the electrical network is increasing mainly due to massive integration of renewable energy systems. However, the electrical dynamic performance of these converters does not match the behavior of the network, which is mainly formed by generation facilities based on big synchronous generation systems. Depending on the desired electrical operation mode different control structures can be implemented in the converters in order to get adapted with the grid conditions. However, changing between different control structures and operation is not an optimal solution, as the resulting system results complex and is not highly robust. As an alternative, this paper presents a new control technique for grid connected power converters based on the concept of virtual admittance. The proposed control permits to emulate the electrical performance of generation facilities based on classical synchronous generators with a power converter, with no need of implementing different control structures, giving rise to a system that provides a friendly and robust operation with the network.

  • Grid harmonic detection and system resonances indentification in wave power plant applications

     Nisak, Khairul; Mir Cantarellas, Antonio; Luna Alloza, Alvaro; Candela Garcia, Jose Ignacio; Rodriguez Cortes, Pedro
    Annual Conference of the IEEE Industrial Electronics Society
    Presentation's date: 2013-11-13
    Presentation of work at congresses

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    There is a growing interest in electrical grid connection of single unit Wave Energy Converters (WECs), as well as the multiple units based Wave Power Plant (WPP) applications. Due to the increasing integration of high power converters in WPP, additional concerns on the harmonic current mitigation of WEC device arise which requires the grid filter installation. Furthermore, the identification and appropriate mitigation of additional harmonics at the WPP level is needed, as any inductances and capacitors of the WPP can interact with the resonant frequency of the entire system and lead to detrimental effects on equipment. The present paper focuses on the potential harmonic studies of a realistic proposed WPP layout, in which the system resonances are identified by performing the frequency scan and modal analysis (HRMA) methods. The later technique has the ability of determining the participation factor of each bus, finding in this way the nodes in the system that have more influence on the obtained results. In this way, the most suitable nodes in which additional filtering solutions should be implemented can be identified.

  • Decentralized control of MTDC networks with energy storage and distributed generation

     Gavriluta, Catalin; Candela Garcia, Jose Ignacio; Citro, Costantino; Luna Alloza, Alvaro; Rodriguez Cortes, Pedro
    IEEE Annual International Energy Conversion Congress and Exhibition for the Asia/Pacific
    Presentation's date: 2013-09-15
    Presentation of work at congresses

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    Multi-terminal dc (MTDC) networks are drawing a lot of interest lately in applications related to distributed generation, especially in those that integrate energy storage. Several approaches for controlling the operation of such systems have been proposed in the literature; however the existing structures can be significantly enhanced. This paper proposes an improved primary control layer, based on droop and dc-bus signaling to serve as a base framework for implementing a hierarchical control structure in a MTDC system. As it will be further discussed in this work, five operating bands as well as various droop characteristics for different elements connected to the dc-bus were defined. For the energy storage the state of charge (SoC) was taken into account at the primary control level and it was included in the droop characteristic, creating a two variables droop surface. The proposed control strategy was validated through simulation and experimental results obtained from a case study that involves a micro dc network composed of a PV generator, a lead-acid battery and one connection point to the ac grid. © 2013 IEEE.

    Multi-terminal dc (MTDC) networks are drawing a lot of interest lately in applications related to distributed generation, especially in those that integrate energy storage. Several approaches for controlling the operation of such systems have been proposed in the literature; however the existing structures can be significantly enhanced. This paper proposes an improved primary control layer, based on droop and dc-bus signaling to serve as a base framework for implementing a hierarchical control structure in a MTDC system. As it will be further discussed in this work, five operating bands as well as various droop characteristics for different elements connected to the dc-bus were defined. For the energy storage the state of charge (SoC) was taken into account at the primary control level and it was included in the droop characteristic, creating a two variables droop surface. The proposed control strategy was validated through simulation and experimental results obtained from a case study that involves a micro dc network composed of a PV generator, a lead-acid battery and one connection point to the ac grid. © 2013 IEEE.

  • 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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  • Harmonic resonances damping using hybrid filter for WPP

     Nisak, Khairul; Rauma, Kalle; Luna Alloza, Alvaro; Candela Garcia, Jose Ignacio; Rodriguez Cortes, Pedro
    Annual Conference of the IEEE Industrial Electronics Society
    Presentation's date: 2012-10-25
    Presentation of work at congresses

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    Harmonic distortion is one of important factor to consider in power system network. In a big network such as wind power plant (WPP), careful analysis and mitigation steps is essential. Many aspects including resonances created from interactions between inductive and capacitive elements must be considered. Passive filter or tuned filters are common solution for mitigating harmonics by creating path for specific harmonic but many times it created a resonance issue. By implementing hybrid filter, an active filter connected in series with shunt passive filter, it enhances the ability of damping the resonant. The concept is adapted from previous research works and in this paper it is implemented on a WPP network. This paper presents a study on harmonic resonances in a WPP, particularly on parallel resonance. The damping of resonance by using common passive filter and an alternative hybrid filter is proved through simulation in PSCAD-EMTDC software. An aggregated WPP model of 400 MW with 40 wind turbines of 10 MW each are used as a study case

  • Study on harmonic resonances and damping in wind power plant

     Md. Hasan, Khairul Nisak; Rauma, Kalle; Luna Alloza, Alvaro; Candela Garcia, Jose Ignacio; Rodriguez Cortes, Pedro
    International Conference on Intelligent & Advanced Systems
    Presentation's date: 2012-06-12
    Presentation of work at congresses

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    Harmonic resonance is among imperative aspect need to be analyzed in a wind power plant (WPP). It becomes complex since it involves a large network with high operating power. This paper presents a study on harmonic resonances in a WPP, particularly on parallel resonance. Important factors including length of cable, number of operating wind turbine and usage of output grid-side filter are analyzed. The damping of resonance by using common passive filter and an alternative hybrid filter is also explored. An aggregated WPP model of 400 MW with 40 wind turbines of 10 MW each are used as a study case

  • Harmonic resonance damping in Wind Power Plant

     Nisak, Khairul; Rauma, Kalle; Luna Alloza, Alvaro; Candela Garcia, Jose Ignacio; Rodriguez Cortes, Pedro
    IEEE Energy Conversion Congress and Exposition
    Presentation's date: 2012-09-15
    Presentation of work at congresses

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    Harmonic is one of main concern in Wind Power Plant (WPP) as growing usage of power electronic converter is observed. Besides the injection of harmonic by individual wind turbine (WT) as source of harmonic, its propagation in network and problem of resonance is also an issue. By implementing passive filter for harmonic mitigation, additional resonance peak is observed due to its interaction with system side impedance. This paper explores the solution for harmonic mitigation with capability of damping resonance in WPP. An aggregated model of 400-MW WPP network is analyzed in correlating resonance and amplification. A passive filter and hybrid filter is designed to mitigate harmonic accordingly. It is shown that hybrid filter able to provide damping capability and improve the performance

  • Advanced structures for grid synchronization of power converters in distributed generation applications

     Luna Alloza, Alvaro; Rocabert Delgado, Joan; Candela Garcia, Jose Ignacio; Rodriguez Cortes, Pedro; Teodorescu, Remus; Blaabjerg, Frede
    IEEE Energy Conversion Congress and Exposition
    Presentation's date: 2012-09-15
    Presentation of work at congresses

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    The Transmission System Operators are specially concerned about the Low Voltage Ride Through requirements of distributed generation power plants. Solutions based on the installation of STATCOMs and DVRs, as well as on advanced control functionalities for the existing power converters have contributed to enhance their response under faulty and distorted scenarios, and hence to fulfill these requirements. In order to achieve satisfactory results it is necessary to count on accurate and fast grid voltage synchronization algorithms, which are able to work under unbalanced and distorted conditions. This paper analyzes and compares the synchronization capability of three advanced synchronization systems: the Decoupled Double Synchronous Reference Frame-Phase-Locked Loop, the Dual Second Order Generalized Integgrator- Phase-Locked Loop and the Three-Phase Enhanced Phase-Locked Loop, designed to work under such conditions. Its response will be analyzed with respect the synchronization needs that can be extracted from the standards

  • 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

  • Access to the full text
    Multi-resonant frequency-locked loop for grid synchronization of power converters under distorted grid conditions  Open access

     Rodriguez Cortes, Pedro; Luna Alloza, Alvaro; Candela Garcia, Jose Ignacio; Mujal Rosas, Ramon Maria; Teodorescu, Remus; Blaabjerg, Frede
    IEEE transactions on industrial electronics
    Date of publication: 2011-01
    Journal article

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    This paper presents a new multiresonant frequencyadaptive synchronization method for grid-connected power converters that allows estimating not only the positive- and negative-sequence components of the power signal at the fundamental frequency but also other sequence components at other harmonic frequencies. The proposed system is calledMSOGI-FLL since it is based on both a harmonic decoupling network consisting of multiple second-order generalized integrators (MSOGIs) and a frequency-locked loop (FLL), which makes the system frequency adaptive. In this paper, the MSOGI-FLL is analyzed for singleand three-phase applications, deducing some key expressions regarding its stability and tuning. Moreover, the performance of the MSOGI-FLL is evaluated by both simulations and experiments to show its capability for detecting different harmonic components in a highly polluted grid scenario.

  • Intelligent connection agent for three-phase grid-connected microgrids

     Rocabert Delgado, Joan; Azevedo, Gustavo M.S.; Luna Alloza, Alvaro; Guerrero Zapata, Josep Maria; Candela Garcia, Jose Ignacio; Rodriguez Cortes, Pedro
    IEEE transactions on power electronics
    Date of publication: 2011
    Journal article

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  • Controlador de admitancia virtual de un convertidor estático de potencia

     Rodriguez Cortes, Pedro; Candela Garcia, Jose Ignacio; Rocabert Delgado, Joan; Teodorescu, Remus
    Date of request: 2011-02-28
    Invention patent

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    La presente invención se refiere a un controlador de admitancia virtual basado en convertidores estáticos de potencia, que comprende un lazo de control en cuya entrada se inyecta la diferencia de tensión existente entre una tensión interna virtual (e) y la tensión existente en el punto de la red al que está conectado (v) y esa diferencia de tensiones alimenta a un procesador de admitancia virtual (13) que es el encargado de determinar el valor de una corriente de referencia (i*) que comunica a una fuente de corriente (14) la cual se encarga de inyectar físicamente dicha corriente a la red (15).

  • Controlador de caracteristica electro-mecánica virtual de un convertidor estático de potencia

     Rodriguez Cortes, Pedro; Candela Garcia, Jose Ignacio; Rocabert Delgado, Joan; Teodorescu, Remus
    Date of request: 2011-02-28
    Invention patent

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    Controlador de la característica electromecánica virtual para un convertidor estático de potencia que comprende un PLC (23) ("power loop controller" o "controlador del lazo de potencia") el cual recibe a la entrada la diferencia de potencia (ΔP) existentes entre la potencia de entrada (Pin) (potencia entregada al convertidor por la fuente primaria) y la potencia entregada a la red (Pelec), y es capaz de modificar en línea los parámetros del coeficiente de inercia virtual y factor de amortiguamiento en función de la respuesta deseada y de las condiciones de la red para diferentes rangos de frecuencia.

  • Controlador de potencia síncrona de un sistema de generación basado en convertidores estáticos de poténcia

     Rodriguez Cortes, Pedro; Candela Garcia, Jose Ignacio; Rocabert Delgado, Joan; Teodorescu, Remus
    Date of request: 2011-02-28
    Invention patent

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  • Single-phase active power filter based on a feedbacked VSI with unipolar voltage switching

     Rodriguez Cortes, Pedro; Candela Garcia, Jose Ignacio; Horta Bernus, Ricard
    Portuguese-Spanish Conference on Electrical Engineering
    Presentation's date: 2011-07-01
    Presentation of work at congresses

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  • Connection and disconnection transients for micro-grids under unbalance load condition

     Rocabert Delgado, Joan; Azevedo, Gustavo M.S.; Candela Garcia, Jose Ignacio; Blaabjerg, Frede; Rodriguez Cortes, Pedro
    European Conference on Power Electronics and Applications
    Presentation's date: 2011-08-01
    Presentation of work at congresses

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    The recent grid integration of Distributed Energy Resources (DER) possibility the formation of intentional islands in the case of a grid fault conditions. For such island formation is required an active agent capable of governing the micro-grid connection state in a safe mode, especially in connection and disconnection transients. This paper focuses on the design of a method oriented to carry out a stable intentional disconnection, and later re-connection, of local grids from the main distribution grid in an intentional way; also under unbalance load condition. Seamless transfer between grid-connected and isolated mode has been achieved in an alpha-beta stationary reference frame with a frequency based synchronization control loop. Simulation and experimental results are provided to verify the proper performance of the proposed solution.

    Postprint (author’s final draft)

  • 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.

  • 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.

  • 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.

  • A three-phase hybrid filter for medium voltage applications using an H-bridge

     Candela Garcia, Jose Ignacio; Rodriguez Cortes, Pedro; Nisak, Khairul; Rauma, Kalle; Hermoso Costa, Juan Ramon; Etxeberria, Ion
    European Conference on Power Electronics and Applications
    Presentation's date: 2011-08-30
    Presentation of work at congresses

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    This paper presents a new solution for filtering current harmonics in three-phase thee-wire medium voltage networks. The hybrid filter topology presented in this paper is characterized by the use of an HBridge instead of the usual thee-phase inverter. This H-bridge is directly connected in series with a passive filter tuned around sixth harmonic. This paper provides a theoretical explanation on voltage control of Hbridge in three-phase systems. The good performance of this new topology as well as the proposed controller will be evaluated by means of simulations.

  • 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).

  • 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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  • FILTRO INTELIGENTE DE POTENCIA PARA SISTEMAS EÓLICOS

     Rocabert Delgado, Joan; Luna Alloza, Alvaro; Hermoso Costa, Juan Ramon; Aldabas Rubira, Emiliano; Candela Garcia, Jose Ignacio; Bogarra Rodriguez, Santiago; Rodriguez Cortes, Pedro
    Participation in a competitive project

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  • Intelligent Connection Agent for Three-Phase Grid-Connected Microgrids

     Rocabert Delgado, Joan
    Defense's date: 2010-09-16
    Department of Electrical Engineering, Universitat Politècnica de Catalunya
    Theses

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  • Intelligent control agent for transient to an island grid

     Rocabert Delgado, Joan; Azevedo, Gustavo; Vázquez Guzman, Gerardo; Candela Garcia, Jose Ignacio; Rodriguez Cortes, Pedro; Guerrero Zapata, Josep Maria
    IEEE International Symposium on Industrial Electronics
    Presentation's date: 2010-07-07
    Presentation of work at congresses

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  • Microgrid connection management based on an intelligent connection agent

     Rocabert Delgado, Joan; Azevedo, Gustavo; Candela Garcia, Jose Ignacio; Teodorescu, Remus; Rodriguez Cortes, Pedro; Etxeberria Otadui, Ion
    IEEE International Conference on Industrial Electronics
    Presentation's date: 2010-11-07
    Presentation of work at congresses

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  • Four-branch star neutral current hybrid power filter and var compensator

     Rodriguez Cortes, Pedro; Candela Garcia, Jose Ignacio; Luna Alloza, Alvaro; Teodorescu, Remus; Blaabjerg, Frede; Rocabert Delgado, Joan
    IEEE Energy Conversion Congress and Exposition
    Presentation's date: 2010-09-12
    Presentation of work at congresses

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  • Aportaciones al filtrado híbrido paralelo en redes trifásicas de cutaro hilos

     Candela Garcia, Jose Ignacio
    Defense's date: 2009-09-08
    Department of Electrical Engineering, Universitat Politècnica de Catalunya
    Theses

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  • Access to the full text
    Current harmonics cancellation in three-phase four-wire systems by using a four-branch star filtering topology  Open access

     Rodriguez Cortes, Pedro; Candela Garcia, Jose Ignacio; Luna Alloza, Alvaro; Asiminoaei, Lucian; Teodorescu, Remus; Blaabjerg, Frede
    IEEE transactions on power electronics
    Date of publication: 2009-08
    Journal article

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    This paper presents a new solution for filtering current harmonics in three-phase four-wire networks. The original four-branch star (FBS) filter topology presented in this paper is characterized by a particular layout of single-phase inductances and capacitors, without using any transformer or special electromagnetic device. Via this layout, a power filter, with two different and simultaneous resonance frequencies and sequences, is achieved—one frequency for positive-/negative-sequence and another one for zero-sequence components.

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

     Luna Alloza, Alvaro; Hermoso Costa, Juan Ramon; Candela Garcia, Jose Ignacio; Rodriguez Cortes, Pedro
    Participation in a competitive project

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  • Técnicas Avanzadas de Control de Sistemas Fotovoltaicos de Generacion Distribuida para Favorecer su Integracion en la Red Electrica (ENE2008-06841-C02-01/ALT, sub-proyecto de ENE2008-06841-C02-00/ALT))

     Hermoso Costa, Juan Ramon; Rodriguez Cortes, Pedro; Candela Garcia, Jose Ignacio; Aldabas Rubira, Emiliano; Jornet Alvarez, Atanasi
    Participation in a competitive project

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  • CONTROL DE SISTEMES ELECTRICS D'ENERGIA RENOVABLE

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

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  • TÉCNICAS AVANZADAS DE CONTROL DE SISTEMAS FOTOVOLTAICOS DE GENERACIÓN DISTRIBUIDA PARA FAVORECER SU INTEGRACIÓN EN LA RED ELECTRICA

     Hermoso Costa, Juan Ramon; Jornet Alvarez, Atanasi; Bogarra Rodriguez, Santiago; Aldabas Rubira, Emiliano; Candela Garcia, Jose Ignacio; Rodriguez Cortes, Pedro
    Participation in a competitive project

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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
    Participation in a competitive project

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  • Parameter estimation of a transformer with saturation using inrush measurements

     Bogarra Rodriguez, Santiago; Font Piera, Antonio; Candela Garcia, Jose Ignacio; Pedra Duran, Joaquin
    Electric power systems research
    Date of publication: 2009-02
    Journal article

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  • Modelling of squirrel-cage induction motors for electromagnetic transient programs

     Pedra Duran, Joaquin; Candela Garcia, Jose Ignacio; Sainz Sapera, Luis
    IET electric power applications
    Date of publication: 2009-03
    Journal article

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  • Saturation model for squirrel-cage induction motors

     Pedra Duran, Joaquin; Candela Garcia, Jose Ignacio; Barrera, A
    Electric power systems research
    Date of publication: 2009-07
    Journal article

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  • Access to the full text
    Proposal of a resonant controller for a three phase four wire grid-connected shunt hybrid filter  Open access

     Candela Garcia, Jose Ignacio; Rodriguez Cortes, Pedro; Luna Alloza, Alvaro; Teodorescu, Remus; Blaabjerg, Frede
    IEEE Energy Conversion Congress and Exposition
    Presentation's date: 2009-09
    Presentation of work at congresses

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    This paper present a three-phase four wire hybrid filter able to perform a selective cancellation of harmonic currents based on resonant controllers. As it will be shown in this work, this kind of control permits to enhance the bandwidth of the filter controller, without hindering the stability of the system. In addition a new hybrid filter topology, that permits to cancel out the homopolar harmonics, is presented in this paper. The good performance of this new topology as well as the proposed controller will be evaluated by means of simulations and experimental results.

  • Grid Synchronization of Power Converters using Multiple Second Order Generalized Integrators

     Rodriguez Cortes, Pedro; Luna Alloza, Alvaro; Candela Garcia, Jose Ignacio; Teodorescu, Remus; Blaabjerg, F
    Annual Conference of the IEEE Industrial Electronics Society
    Presentation of work at congresses

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