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  • Contribution of type-2 wind turbines to sub-synchronous resonance damping

     de Prada Gil, Mikel; Mancilla David, Fernando; Domínguez García, José Luis; Muljadi, Eduard B.; Singh, Mohit B.; Gomis Bellmunt, Oriol; Sumper, Andreas
    International journal of electrical power and energy systems
    Date of publication: 2014-02
    Journal article

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    The rapidly increasing level in wind power penetration is leading to a modification of power system dynamics. Transmission system operators are concerned about this, and are requiring wind farms to comply with some grid codes. For this reason, it is important to determine the grid support capabilities of wind farms, in order to fulfill all current and future requirements. The aim of this paper is to demonstrate that partial-variable speed wind turbines (WT) employing a wound rotor induction generator equipped with an controllable external resistor (so-called Type-2 WTs) are capable to damp Sub-Synchronous Resonance (SSR) occurring on close synchronous generators, when they are connected through a series compensated transmission lines to the main grid. The IEEE first benchmark model (IEEE-FBM) for SSR studies is adopted as test case and modified with an aggregated Type-2 WPP model connected to the system. A damping control algorithm based on adjusting the average value of the external rotor resistance via the control its chopper's duty cycle is presented and implemented using PSCAD/EMTDC software. Detailed computer simulations suggest effective contribution of Type-2 WT to damp SSR affecting synchronous generators. © 2013 Elsevier Ltd. All rights reserved.

  • Active power estimation of photovoltaic generators for distribution network planning based on correlation models

     Ramón Marín, Miquel; Sumper, Andreas; Villafafila Robles, Roberto; Bergas Jane, Joan Gabriel
    03605442
    Date of publication: 2014-01-01
    Journal article

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    For the last years, PV (photovoltaic) generation has been having an important impact on LV (low voltage) and MV (medium voltage) grids in Spain, due to the increasing number of installations. As power monitoring of the generation is in most cases not required, utilities are forced to make assumptions on PV power generation in order to perform network planning studies for both peak demand and contingency analysis. These assumptions increase errors committed during the analysis, as the number of PV installations increases. This paper presents a methodology for estimating PV active power generation values for planning purposes in MV and LV power systems, from historic generation data, based on the development of correlation models. This methodology is applied to three different examples, using predictors based on real registered data. The methodology was also applied in a typical grid study and it's error was determined. (C) 2013 Elsevier Ltd. All rights reserved.

  • Flicker mitigation by reactive power control in wind farm with doubly fed induction generators

     Girbau Llistuella, Francesc; Sumper, Andreas; Díaz González, Francisco; Galceran Arellano, Samuel
    International journal of electrical power and energy systems
    Date of publication: 2014-02
    Journal article

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    This paper presents a novel wind farm control with the purpose to mitigate the flicker emission of doubly fed induction generators. The presented control strategy is implemented in a wind farm connected to a distribution grid with consumers. The control system is composed by two controllers in cascade, the wind farm control and the local wind turbine controller. The wind farm control adapts itself to the consumptions of the distribution network and generates the minimal reactive power which allows smoothing the fast variations of wind power output. In this sense, the wind farm control facilitates the integration of wind farm into weak power grids by exchanging reactive power with network. Moreover, the wind farm controller has to be stable, fast and robust and the wind farm dispatch function has to guarantees that the local wind turbine controller can exchange the reactive power set point with network. This controller has been developed with the simulation tool DigSilent PowerFactory v14.1. © 2013 Elsevier Ltd. All rights reserved.

  • Experimental Validation of Optimal Real-time Energy Management System for Microgrids.

     Marzband, Mousa
    Defense's date: 2014-01-20
    Universitat Politècnica de Catalunya
    Theses

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    Actualmente, producción, la fiabilidad, calidad de la energía, la eficiencia y la penetración de las energías renovables son algunos de los temas más importantes en el análisis de sistemas de potencia. Por este motivo, la necesidad de obtener una potencia óptima y las políticas de despacho económicos se requieren al mismo tiempo. Un gran interés para la extracción de un rendimiento minimizando precio óptimo del mercado de compensación (MCP) para los consumidores y el mejor uso de las fuentes renovables de energía está en aumento en los últimos años. A causa de balance de energía entre las fluctuaciones en la demanda de carga y de carácter no gestionable por fuentes renovables, para implementar un sistema de gestión de energía (EMS) tiene gran interés dentro Microgrid (MG). La aparición de nuevas tecnologías como el almacenamiento de energía (ES) ha provocado un aumento en el esfuerzo para presentar métodos nuevos o modificados de optimización de la gestión del sistema eléctrico. La predicción de las fuentes de energía renovables sólo puede predecirse con precisión con una pequeña anticipación. Por lo tanto, para aumentar la eficiencia del algoritmo de optimización presentado a gran escala, nuevos métodos deben ser propuestos en esta dirección, en especial en la programación a corto plazo. Se necesitan métodos de optimización de gran alcance para ser aplicado y lograr el máximo rendimiento, aumentar el despacho económico, así como la adquisición de las mejores prestaciones de estos sistemas. De acuerdo con los casos antes mencionados, la gestión de energía en tiempo real dentro de MG es un agente necesario para los operadores para garantizar un funcionamiento óptimo y seguro del sistema. La propuesta EMS debería ser capaz de programar la generación MG con la información mínima compartido enviado por unidades de generación. Para llegar a esta capacidad, esta tesis presenta una arquitectura operacional para la operación en tiempo real (RTO) de una MG que opera en ambos modos en isla y conectados a la red. La arquitectura presentada es flexible y se podría utilizar para diferentes configuraciones de MG también en diferentes escenarios. Una fórmula general se presenta también para la estimación de la estrategia de funcionamiento óptimo, plan de optimización de costes y la reducción de la electricidad consumida combinado con respuesta de la demanda (DR). El problema propuesto se formula en combinación como un problema de optimización con restricciones no lineales para reducir al mínimo el costo relacionado con las fuentes de generación y la carga de respuesta, así como la reducción de MCP. Se formula como un problema de optimización no lineal que tiene la igualdad y limitaciones no igualdad. Varios métodos de optimización como la programación lineal mixta, fuente de pivote, la competencia imperialista, colmena artificial, enjambre de partículas, colonia de hormigas, algoritmos de búsqueda gravitacionales son utilizados para lograr objetivos específicos. El objetivo principal de esta tesis es el de validar experimentalmente el diseño de un sistema de gestión de energía en tiempo real para los MGs en ambos modos de funcionamiento adecuado para diferentes tamaños y tipos de recursos de generación y dispositivos de almacenamiento con estructura de plug- and-play. Como resultado, este sistema es capaz de adaptarse a los cambios en la generación y activos de almacenamiento, en tiempo real, y la entrega de órdenes de operación óptimas para los activos de forma rápida, el uso de un mercado local de energía (LEM) estructura basada en una sola cara o de doble cara subasta. El estudio está dirigido a exponer la operación óptima de micro- fuentes a, así como para disminuir el costo de producción de electricidad por día y por hora en tiempo real por delante de programación. Validación de resultados experimentales muestran la eficacia para un funcionamiento óptimo con el mínimo coste y capacidad plug- and-play en un MG.

  • Distribution system reconfiguration using genetic algorithm based on connected graphs

     Tomoiaga, Bodgan; Chindris, Mircea; Sumper, Andreas; Villafafila Robles, Roberto; Sudria Andreu, Antoni
    Electric power systems research
    Date of publication: 2013-11
    Journal article

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    The reconfiguration of a power distribution system, by exchanging the functional links between its elements, represents one of the most important procedures to improve the performance in the operation of a distribution system. The optimization through reconfiguration (or optimal reconfiguration) of a power distribution system is not a new problem but still represents a difficult one and is specified in some strategies for smart grids. The paper addresses this problem as a single objective one, where, as main criterion, active power losses have been chosen. There is no unique acceptance regarding which approach (based on heuristics, meta-heuristics, genetic algorithms, etc.) is the most proper to use in order to solve this problem. The most important thing is how the specific knowledge of the problem domain is used and modeled in the implementation. Moreover, the indices which can quantify the quality of a reconfiguration method consist in runtime and the obtained solution and these indices can be confirmed only by experimental results. In order to solve the problem (to search and find the optimal solution) an original genetic algorithm based on connected graphs is proposed. Comparative tests performed on some test systems demonstrated the accuracy and the promptness of the proposed algorithm. AbbreviationsPactive power lossesVinodes voltagesI ijelectric current through a branch ijijbinary variable representing the status of a tie line (0 - open, 1 - closed)nthe number of electric system nodespthe number of connected componentsXthe set of power system nodesEthe set of power system lines (branches).

  • Experimental validation of a real time energy management system for microgrids in islanded mode using a local day-ahead electricity market and MINLP

     Marzband, Mousa; Sumper, Andreas; Domínguez García, José Luis; Gumara Ferret, Ramon
    Energy conversion and management
    Date of publication: 2013-12
    Journal article

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    Energy management systems (EMS) are vital supervisory control tools used to optimally operate and schedule Microgrids (MG). In this paper, an EMS algorithm based on mixed-integer nonlinear programming (MINLP) is presented for MG in islanding mode considering different scenarios. A local energy market (LEM) is also proposed with in this EMS to obtain the cheapest price, maximizing the utilization of distributed energy resources. The proposed energy management is based on LEM and allows scheduling the MG generation with minimum information shared sent by generation units. Load demand management is carried out by demand response concept to improve reliability and efficiency as well as to reduce the total cost of energy (COE). Simulations are performed with real data to test the performance and accuracy of the proposed algorithm. The proposed algorithm is experimentally tested to evaluate processing speed as well as to validate the results obtained from the simulation setup on a real MG Testbed. The results of the EMS-MINLP based on LEM are compared with a conventional EMS based on LEM. Simulation and experimental results show the effectiveness of the proposed algorithm which provides a reduction of 15% in COE, in comparison with conventional EMS. © 2013 Elsevier Ltd. All rights reserved.

  • Energy management of flywheel-based energy storage device for wind power smoothing

     Díaz González, Francisco; Sumper, Andreas; Gomis Bellmunt, Oriol; Bianchi, Fernando Daniel
    Applied energy
    Date of publication: 2013-10
    Journal article

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    Power fluctuations of wind generators may affect power quality especially in weak or isolated grids. This paper proposes an energy management strategy for a flywheel-based energy storage device. The aim of the flywheel is to smooth the net power flow injected to the grid by a variable speed wind turbine. The design of the energy management strategy is conducted through several phases. First, a definition and determination of the optimal operation of the storage device is carried out through the formulation and deterministic solution of an optimization problem in GAMS. Based on this solution, an online energy management algorithm is proposed to achieve a close to optimal operation of the flywheel. This algorithm determines the set points of the torque control of the flywheel electrical machine. The proposed methodology is illustrated by simulations.

  • The optimization of microgrids operation through a heuristic energy management algorithm

     Tomoiaga, Bogdan; Chindris, Mircea; Sumper, Andreas; Marzband, Mousa
    Advanced Engineering Forum
    Date of publication: 2013
    Journal article

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  • Monitoring power quality in microgrids based on disturbances propagation algorithms

     Miron, Anca; Chindris, Mircea; Sumper, Andreas
    Advanced Engineering Forum
    Date of publication: 2013-06
    Journal article

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  • Deep offshore wind farm planning and cost calculation tools

     Perez, German; Lopez Mendia, Joseba; Val, Laura; Sumper, Andreas; Schuon, Frieder; de Prada Gil, Mikel; Aragües, Monica; Lopes, Helder; Ergun, Hakan; van Hertem, Dirk
    European Wind Energy Association Conference
    Presentation of work at congresses

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    In planning the installation and operation of wind turbines in the offshore environment, finding new technological solutions is a key element for the economic success of offshore wind projects and represents a completely new challenge compared to their onshore counterpart. The tendency is that wind turbines will continue growing larger and more powerful and will be installed further away and in deeper waters, leading to more complex infrastructures and greater challenges. There¿s a proven experience in the planning and front end engineering of fixed offshore wind farms. Promoters and engineering companies have tools for the costs calculation and wind farm planning, that support the decision making process for the investment. In deep offshore wind farms, there¿s still a lack of this type of tools due to the development stage of the technology: only two full scale prototypes installed. These tools can help in the optimization of the wind farm and costs reduction.

  • Type-2 wind turbine with additional sub-synchronous resonance damping

     de Prada Gil, Mikel; Domínguez García, José Luis; Mancilla David, Fernando; Muljadi, Eduard B.; Singh, Mohit B.; Gomis Bellmunt, Oriol; Sumper, Andreas
    IEEE Green Technologies Conference
    Presentation's date: 2013-04
    Presentation of work at congresses

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    Wind turbines (WTs) employing a wound rotor induction generator with adjustable external resistors are known as Type-2 WTs. This WT topology is available in USA since 2001. This WT is regulated by controlling its pitch angle and its external rotor resistor to operate as a variable slip WT. The slip range can reach up to 10% above synchronous speed. This paper demonstrates that with a proper control, Type-2 WTs are capable to damp out sub synchronous resonance (SSR) oscillations commonly found in series-compensated transmission lines. The size of wind power plant (WPP) has increased over the years and some WPP exceeds 500 MW. They can be treated as energy sources which can regulate the power delivered to the grid. In order to analyze the capability of Type-2 WPPs to damp power system oscillations, the IEEE first benchmark model for SSR studies is modified with an aggregated Type-2 WPP model connected to the system. An additional control loop is implemented to modulate the effective rotor resistance so that SSR oscillations can be damped. The models are implemented and simulated using PSCAD/EMTDC software platform.

  • Experimental evaluation of a real time energy management system for stand-alone microgrids in day-ahead markets

     Marzband, Mousa; Sumper, Andreas; Ruiz Álvarez, Albert; Domínguez García, José Luis; Tomoiaga, Bogdan
    Applied energy
    Date of publication: 2013-06-01
    Journal article

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    A Microgrid (MG) Energy Management System (EMS) is a vital supervisory control to make decisions regarding the best use of the electric power generation resources and storage devices within this MG. This paper presents an operational architecture for Real Time Operation (RTO) of an islanded MG. This architecture considers two different parts including Central Control Unit (CCU) and MG Testbed. CCU implements an EMS based on Local Energy Market (LEM) to control a MG. In order to reach this objective, this unit executes Day Ahead Scheduling (DAS) and Real Time Scheduling (RTS). Regarding DAS, a Modified Conventional EMS (MCEMS) based on LEM (MCEMS-LEM) algorithm has been proposed to find out hourly power set-points of Distributed Energy Resources (DERs) and customers. LEM is also presented in MCEMS-LEM to obtain the best purchasing price in Day-Ahead Market (DAM), as well as to maximize the utilization of existing DER. With regard to RTS, it must update and feedback the power set-points of DER by considering the results of DAS. The presented architecture is flexible and could be used for different configurations of MGs also in different scenarios. Simulations and experimental evaluations have been carried out using real data to test the performance and accuracy of the MG testbed. This paper aims to operate the MG in islanded mode, ensuring uninterruptable power supply services and reducing the global cost of generated power. Results demonstrate the effectiveness of the proposed algorithm and show a reduction in the generated power cost by almost 8.5%.

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    Pareto optimal reconfiguration of power distribution systems using a genetic algorithm based on NSGA-II  Open access

     Tomoiaga, Bogdan; Chindris, Mircea; Sumper, Andreas; Sudria Andreu, Antoni; Villafafila Robles, Roberto
    Energies
    Date of publication: 2013-03-06
    Journal article

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    Reconfiguration, by exchanging the functional links between the elements of the system, represents one of the most important measures which can improve the operational performance of a distribution system. The authors propose an original method, aiming at achieving such optimization through the reconfiguration of distribution systems taking into account various criteria in a flexible and robust approach. The novelty of the method consists in: the criteria for optimization are evaluated on active power distribution systems (containing distributed generators connected directly to the main distribution system and microgrids operated in grid-connected mode); the original formulation (Pareto optimality) of the optimization problem and an original genetic algorithm (based on NSGA-II) to solve the problem in a non-prohibitive execution time. The comparative tests performed on test systems have demonstrated the accuracy and promptness of the proposed algorithm.

    Reconfiguration, by exchanging the functional links between the elements of the system, represents one of the most important measures which can improve the operational performance of a distribution system. The authors propose an original method, aiming at achieving such optimization through the reconfiguration of distribution systems taking into account various criteria in a flexible and robust approach. The novelty of the method consists in: the criteria for optimization are evaluated on active power distribution systems (containing distributed generators connected directly to the main distribution system and microgrids operated in grid-connected mode); the original formulation (Pareto optimality) of the optimization problem and an original genetic algorithm (based on NSGA-II) to solve the problem in a non-prohibitive execution time. The comparative tests performed on test systems have demonstrated the accuracy and promptness of the proposed algorithm.

  • Modeling of second generation HTS cables for grid fault analysis applied to power system simulation

     Del-Rosario Calaf, Gerard; Lloberas Valls, Joaquim; Sumper, Andreas; Granados García, Xavier; Villafafila Robles, Roberto
    IEEE transactions on applied superconductivity
    Date of publication: 2013
    Journal article

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  • Economic cost analysis of stand-alone hybrid microgrids with minimum COE using HOMER

     Marzband, Mousa; Khaneh Zarrin, Reza; Sumper, Andreas; Baghramian, Alfred
    Majlesi Journal of Energy Management
    Date of publication: 2013
    Journal article

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  • Modeling, control and experimental validation of a flywheel-based energy storage device

     Díaz González, Francisco; Sumper, Andreas; Gomis Bellmunt, Oriol; Villafafila Robles, Roberto
    EPE journal
    Date of publication: 2013-06
    Journal article

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    This work deals with the modeling, control and experimental validation of a flywheel-based energy storage device. The system is based on a low-speed rotating disk mechanically coupled to a Permanent Magnet Synchronous Machine (PMSM). The electrical power is exchanged with the external grid by means of a set of back-to-back power converters. These power electronics control the speed of the machine, and thus the active power absorbed or injected by the device, and also regulate the reactive power at the point of common coupling with the external grid. Vector control techniques are used for designing the converter controllers: a field oriented vector control algorithm is implemented for governing the servomotor while an instantaneous power theory-based algorithm is used to manage the active and reactive currents flowing from the grid side converter. The control implementation in the experimental setup has been carried out by means of programming Digital Signal Processors (DSP's). The modeling and control system design has been validated after executing several experiments. Other characteristics such as the torque losses of the system as well as the system performance concerning energy rating, power rating and energy efficiency characteristics are determined experimentally.

  • Contributions of Flywheel Systems in Wind Power Plants

     Díaz González, Francisco
    Defense's date: 2013-09-30
    Universitat Politècnica de Catalunya
    Theses

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  • Cables and lines

     Pezzini, Paola; Sumper, Andreas
    Date of publication: 2012-04
    Book chapter

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  • Industrial heating processes

     Chindris, Mircea; Sumper, Andreas
    Date of publication: 2012-04
    Book chapter

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    Dimensioning electric charging posts for PEV  Open access

     Cairó, Ignasi; Cruz, Miguel; Sumper, Andreas
    International Conference on Electricity Distribution
    Presentation's date: 2012-05-29
    Presentation of work at congresses

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    This paper represents a new analysis method for the estimation of the required charging infrastructure for the electric vehicles (EV’s). The study is based on a real metropolitan area, taking real data from transport habits, and a prediction of certain degree of penetration of EV’s. To cope with this analysis, is the application of powerful tools, used for example in telecommunication systems such as Markov chains, and applied here into EV’s necessities and charging stations infrastructures. This theory is applied in a real example to provide more insight on how can be applied in real circumstances.

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    Power system stabiliser capability of offshore wind power plants  Open access

     Domínguez García, José Luis; Gomis Bellmunt, Oriol; Bianchi, Fernando Daniel; Sumper, Andreas; Sudria Andreu, Antoni
    European Wind Energy Conference & Exhibition
    Presentation's date: 2012-04
    Presentation of work at congresses

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    Nowadays, wind power generation is being located offshore because of its higher wind speed at lower height and larger installation zones in comparison with onshore technologies. Recently, the concept of wind power plant has been introduced as a result of the increment of wind power penetration in power systems. Transmission system operators are requiring wind power generation to help to power system with some ancillary services such as fault ride through or power system stabiliser capability. Therefore, it is important to study power system stabiliser capability of wind power plants. In this paper, a comparison of various power system stabiliser schemes is presented. The effect of the distance from the shore tie-line to the offshore wind farm on the controller response is also evaluated. These studies show that offshore wind power plants have promising power system stabiliser capability even using local input signals.

  • Modeling and control of a pitch-controlled variable-speed wind turbine driven by a DFIG with frequency control support in PSS/E

     de Prada Gil, Mikel; Sumper, Andreas; Gomis Bellmunt, Oriol
    IEEE conference on Power Electronics and Machines in Wind Applications
    Presentation's date: 2012-07
    Presentation of work at congresses

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    Modeling and validation of a flywheel energy storage lab-setup  Open access

     Díaz González, Francisco; Sumper, Andreas; Gomis Bellmunt, Oriol; Villafafila Robles, Roberto
    IEEE PES Innovative Smart Grid Technologies
    Presentation of work at congresses

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    This work deals with the modeling, control and experimental validation of a flywheel test bench which is part of IREC's lab-scale microgrid. The storage device has been designed as a proof of concept. It is based on a low-speed rotating disk mechanically coupled to a Permanent Magnet Synchronous Machine. The electrical power is exchanged with the external grid by means of a set of back-to-back power converters. These power electronics control the speed of the machine, and thus the active power absorbed or injected by the device, and also regulate the reactive power at the point of common coupling with the external grid. Vector control techniques are used for designing the converter controllers: a field oriented vector control algorithm is implemented for governing the servomotor while the instantaneous power theory-based algorithm is used to manage the active and reactive currents flowing from the grid side converter. The control implementation in the experimental setup has been carried out by means of programming Digital Signal Processors (DSP's). The modeling and control system design has been validated after executing several experiments.

    This work deals with the modeling, control and experimental validation of a flywheel test bench which is part of IREC’s lab-scale microgrid. The storage device has been designed as a proof of concept. It is based on a low-speed rotating disk mechanically coupled to a Permanent Magnet Synchronous Machine. The electrical power is exchanged with the external grid by means of a set of back-to-back power converters. These power electronics control the speed of the machine, and thus the active power absorbed or injected by the device, and also regulate the reactive power at the point of common coupling with the external grid. Vector control techniques are used for designing the converter controllers: a field oriented vector control algorithm is implemented for governing the servomotor while the instantaneous power theory-based algorithm is used to manage the active and reactive currents flowing from the grid side converter. The control implementation in the experimental setup has been carried out by means of programming Digital Signal Processors (DSP’s). The modeling and control system design has been validated after executing several experiments.

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    Requirements for EV charge stations with photovoltaic generation and storage  Open access

     Cairó, Ignasi; Sumper, Andreas
    IEEE Innovative Smart Grid Technologies Conference Europe
    Presentation of work at congresses

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    With the increase in electric mobility, public and private charge facilities will be required to provide solutions adjusted to the actual needs and requirements. A new methodology for dimensioning charge stations for electric vehicles (EVs) is presented in this paper. Such proposal is based on the Markov chains, and uses as output rates, the capabilities of the charge station in providing energy from the sun through photovoltaic generation, stored energy in local batteries and also as a back-up the power grid. A numerical result is also presented for a better understanding of the process.

    With the increase in electric mobility, public and private charge facilities will be required to provide solutions adjusted to the actual needs and requirements. A new methodology for dimensioning charge stations for electric vehicles (EVs) is presented in this paper. Such proposal is based on the Markov chains, and uses as output rates, the capabilities of the charge station in providing energy from the sun through photovoltaic generation, stored energy in local batteries and also as a back-up the power grid. A numerical result is also presented for a better understanding of the process.

    Postprint (author’s final draft)

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    Energy management system of hybrid microgrid with energy storage  Open access

     Marzband, Mousa; Sumper, Andreas; Chindris, Mircea; Tomoiaga, Bogdan
    World Energy Systems Conference
    Presentation's date: 2012-06-28
    Presentation of work at congresses

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    The economic scheduling of the generation units is playing a significant role in the energy management of the hybrid stand alone microgrid. Energy storage is an increasingly important part of the renewable energy sector because of the need to store power during peak production times for use in off-peak periods. This paper describes an energy management system (EMS) for an islanded microgrid (MG) comprising wind energy conversion system (WECS),photovoltaic (PV), energy storage (ES) system, and microturbine (MT) for calculating the battery charging price (BCP) factor. To reach this objective, firstly the battery system has been modeled using the presented equations then various scenarios is applied by technically limited such as the power, voltage and current applied to charge and discharge of the battery.

  • PSS controller for wind power generation systems

     Domínguez García, José Luis; Gomis Bellmunt, Oriol; Bianchi, Fernando Daniel; Sumper, Andreas
    International journal of modern physics B
    Date of publication: 2012
    Journal article

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  • Tendencias en el desarrollo de las smart grids

     Sumper, Andreas
    Automática e instrumentación
    Date of publication: 2012-09
    Journal article

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    Probabilistic method to assess the impact of charging of electric vehicles on distribution grids  Open access

     Valsera-Naranjo, Eduardo; Sumper, Andreas; Villafafila Robles, Roberto; Martínez Vicente, David
    Energies
    Date of publication: 2012-05-18
    Journal article

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    This paper describes a grid impact analysis of charging electric vehicles (EV) using charging curves with detailed battery modelling. A probabilistic method using Monte Carlo was applied to a typical Spanish distribution grid, also using mobility patterns of Barcelona. To carry out this analysis, firstly, an IEEE test system was adapted to a typical distribution grid configuration; secondly, the EV and its battery types were modeled taking into account the current vehicle market and the battery characteristics; and, finally, the recharge control strategies were taken into account. Once these main features were established, a statistical probabilistic model for the household electrical demand and for the EV charging parameters was determined. Finally, with these probabilistic models, the Monte Carlo analysis was performed within the established scenario in order to study the lines’ and the transformers’ loading levels. The results show that an accurate model for the battery gives a more precise estimation about the impact on the grid. Additionally, mobility patterns have been proved to be some of the most important key aspects for these type of studies.

  • Power generation efficiency analysis of offshore wind farms connected to a SLPC (single large power converter) operated with variable frequencies considering wake effects

     de Prada Gil, Mikel; Gomis Bellmunt, Oriol; Sumper, Andreas; Bergas Jane, Joan Gabriel
    Energy
    Date of publication: 2012-01
    Journal article

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  • A review of energy storage technologies for wind power applications

     Díaz González, Francisco; Sumper, Andreas; Gomis Bellmunt, Oriol; Villafafila Robles, Roberto
    Renewable and sustainable energy reviews
    Date of publication: 2012-05
    Journal article

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  • Power oscillation damping supported by wind power: A review

     Domínguez García, José Luis; Gomis Bellmunt, Oriol; Bianchi, Fernando Daniel; Sumper, Andreas
    Renewable and sustainable energy reviews
    Date of publication: 2012-09-03
    Journal article

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  • Dynamic model of an HTS cable for power grid simulation

     Del-Rosario Calaf, Gerard; Sumper, Andreas; Granados García, Xavier; Sudria Andreu, Antoni; Villafafila Robles, Roberto
    Physics Procedia
    Date of publication: 2012
    Journal article

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  • Aportaciones al modelado de la generación fotovoltaica para la planificación de la red de distribución  Open access

     Ramon Marin, Miguel Angel
    Defense's date: 2012-11-08
    Department of Electrical Engineering, Universitat Politècnica de Catalunya
    Theses

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    In this thesis it have been explained the problems that the electric distribution companies in Spain have to plan and operate their power networks, having no detailed measurements of instant active power of a large number of non-programmable generators connected to them. The main objective is to reduce errors and difficulties that this lack of information generates. It has been analyzed the specific case of photovoltaic generators (PV), representing at the end of 2011, a 94.6 % of the special regime generators connected to the power networks in Spain, and have an average power of 72 kW per plant at the end of 2011. This means that are mainly connected to the distribution network, so we study the specific issues regarding the planning of the distribution network. It is defined that prediction models of solar irradiance are divided into parametric and decomposition. The ASHRAE parametric model prediction of solar irradiance is described, checking that its instant error levels are not negligible when compared with real data, since it does not include components that provide greater instant solar irradiance variability, such as atmospheric phenomena. It has been described a model based on the usability for the prediction of instantaneous power of PV generation, which is based on an hourly rate of sunlight (Kt) to transfer the extraterrestrial solar irradiation to a horizontal surface on Earth ¿s surface. It has been seen that the definition of the statistical function that defines Kt, makes the difference between the different models based on usability. It has been developed a proposed solution, which allows the development of models using predictors measured at the Earth¿s s urface, which incorporate the variability of atmos pheric phenomena. It has been evaluated the available data for the distribution companies, as well as specified the conditions necessary to develop specific models to be applied in distribution network planning. The proposed solution consists in a systematic methodology for developing models, based on historical data, which provides a response to a wide range of applications for distribution network analysis. It has been shown that the geographic scope of validity of the developed models exceeds the average needs for distribution network planning. It have been developed three case studies, where application of the methodology has been developed, based on real data of a distribution network in the province of Lleida, Spain. Also, it has been found that the models needed for photovoltaic plants with solar follower are different from those needed for photovoltaic plants without follower, because they need to be developed from different predictors. Contributions have been developed based on examples of application of the developed models to network analysis, based on another set of real data from the distribution network in Lleida, corresponding to a medium voltage line (25 kV). Based on this example it have been described the possible options when applying the methodology, as well as several different situations, drawing conclusions. Furthermore, it have been evaluated the possible seasonality of the models, and therefore, the contribution that would get from the development of specific models for each quarter, against the development of a single model for the prediction of the whole year. Barcelon

    Mediante la presente tesis se ha planteado la problemática existente en las empresas de distribución en España, que han de planificar y operar sus redes eléctricas sin disponer de medidas de potencia activa instantánea de un alto número de generadores fotovoltaicos conectados a las mismas, con el objetivo principal de reducir los posibles errores y dificultades que dicha falta de información genera. Se ha estudiado el caso concreto de los generadores fotovoltaicos, que representan al cierre del año 2011 el 94,6% de los generadores en régimen especial conectados en las redes eléctricas en España, y que al contar con una potencia media por instalación de 72 kW al cierre del año 2011, están mayoritariamente conectados a la red de distribución, por lo que se estudian las problemáticas especificas en cuanto a la planificación de dicha red. Con el fin de predecir la producción fotovoltaica de una forma indirecta, ya que no se dispone de la totalidad de los datos necesarios directamente, se precisan modelos basados en los predictores disponibles, como la irradiancia solar. Se ha definido que los modelos de predicción de la irradiancia solar se dividen en paramétricos y de descomposición. Se ha descrito el modelo paramétrico ASHRAE de predicción de la irradiancia solar, comprobando que obtiene unos niveles de error que no son despreciables al compararlos con datos reales, dado que no incorpora los componentes que aportan mayor variabilidad a dicha irradiancia solar instantánea, como son los fenómenos atmosféricos. Se ha descrito un modelo de descomposición basado en la utilizabilidad, para la predicción de la potencia instantánea de generación de una planta fotovoltaica, que se basa en un índice horario de claridad solar (Kt) para trasladar la irradiación solar extraterrestre a una superficie horizontal en la superficie terrestre. Se ha podido ver que es la definición de la función estadística que define a Kt, lo que marca la diferencia entre los diferentes modelos basados en la utilizabilidad. Por tanto, los modelos existentes o bien no consideran los fenómenos que tienen lugar en la superficie terrestre, o bien los consideran de forma estadística para largos períodos. Se ha desarrollado una propuesta de solución que permite el desarrollo de modelos utilizando predictores medidos en la superficie terrestre, los cuales incorporan la variabilidad de los fenómenos atmosféricos. Se incorpora en la elaboración de dicha solución la evaluación de los datos disponibles en el entorno de las compañías distribuidoras, así como la especificación de los condicionantes necesarios en el modelado especifico a desarrollar para su utilización en la planificación de la red de distribución. La propuesta de solución consiste en una metodología sistemática de desarrollo de modelos, a partir del tratamiento estadístico de datos reales históricos, que permite dar una respuesta a una amplia gama de aplicaciones de análisis de la red de distribución. Se ha demostrado que el ámbito geográfico de validez de los modelos supera ampliamente las necesidades medias específicas para su utilización en la planificación de la red de distribución. Se han desarrollado ejemplos reales de aplicación de la metodología desarrollada, basados en datos reales de la red de distribución en la provincia de Lleida, en España. Con ellos se ha podido comprobar que los modelos necesarios para plantas fotovoltaicas con seguidor son diferentes de los necesarios para plantas fotovoltaicas sin seguidor, pues necesitan desarrollarse a partir de predictores diferentes. Se han desarrollado aportaciones en base a ejemplos de aplicación de los modelos desarrollados al análisis de red, basados en otra serie de datos reales de la red de distribución en Lleida, correspondientes a una línea de distribución en media tensión (25 kV). En base a dicho ejemplo se han descrito las posibles opciones a la hora de la aplicación de la metodología, así como se han analizado diversas casuísticas que se pueden presentar, extrayendo conclusiones. Así mismo, se ha evaluado la posible estacionalidad de los modelos, y por tanto, la aportación que conllevaría el desarrollo de modelos específicos para cada trimestre del año, frente al desarrollo de un único modelo para la predicción de todo el año. También se han presentado ejemplos de aplicación de los modelos a la resolución de un caso mediante un flujo de cargas.

  • Optimum voltage control for loss minimization in HVDC multi-terminal transmission systems for large offshore wind farms

     Aragües Peñalba, Mónica; Egea Alvarez, Agustí; Gomis Bellmunt, Oriol; Sumper, Andreas
    Electric power systems research
    Date of publication: 2012-08
    Journal article

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  • Object oriented backward/forward algorithm for unbalanced and harmonic polluted distribution systems

     Tomoiaga, Bogdan; Chindris, Mircea; Sudria Andreu, Antoni; Sumper, Andreas
    International Conference on Electrical Power Quality and Utilisation
    Presentation's date: 2011-10-17
    Presentation of work at congresses

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  • Promotion of renewable energy in Latin America for the security of electric supply

     Aquino Robles, Jose A.; Villafafila Robles, Roberto; Sumper, Andreas; Ramirez Pisco, Rodrigo
    International Conference on Electrical Power Quality and Utilisation
    Presentation's date: 2011-10-17
    Presentation of work at congresses

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  • A utility connected microgrid based on power emulators

     Gomis Bellmunt, Oriol; Sumper, Andreas; Colet Subirachs, Alba; Ruiz Alvarez, Albert; Alvarez Cuevas-Figuerola, Felipe; Sudria Andreu, Antoni
    IEEE Power & Energy Society General Meeting
    Presentation's date: 2011-07
    Presentation of work at congresses

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  • Probabilistic analysis in normal operation of distribution system with distributed generation

     Villafafila Robles, Roberto; Sumper, Andreas; Bak-Jensen, Birgitte; Valsera Naranjo, Eduardo
    IEEE Power & Energy Society General Meeting
    Presentation's date: 2011-07
    Presentation of work at congresses

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  • Deterministic and probabilistic assessment of the impact of the electrical vehicles on the power grid

     Valsera Naranjo, Eduardo; Martinez Vicente, David; Sumper, Andreas; Villafafila Robles, Roberto; Sudria Andreu, Antoni
    IEEE Power & Energy Society General Meeting
    Presentation's date: 2011-07
    Presentation of work at congresses

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  • Protection system remote laboratory

     Martinez Perez, Raul; Villafafila Robles, Roberto; Lloret Gallego, Pau; Egea Alvarez, Agustí; Sumper, Andreas; Silos Sanchez, Angel
    Electrical Power Quality and Utilisation
    Presentation's date: 2011-10-17
    Presentation of work at congresses

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  • Access to the full text
    Power system stabilizer control for wind power to enhance power system stability  Open access

     Domínguez García, José Luis; Gomis Bellmunt, Oriol; Bianchi, Fernando Daniel; Sumper, Andreas
    International Scientific Conference on Physics and Control
    Presentation's date: 2011-09-05
    Presentation of work at congresses

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    The paper presents a small signal stability analysis for power systems with wind farm interaction. Power systems have damping oscillation modes that can be excited by disturbance or fault in the grid. The power converters of the wind farms can be used to reduce these oscillations and make the system more stable. These ideas are explored to design a power system stabilized (PSS) for a network with conventional generators and a wind farm in order to increase the damping of the oscillation modes. The proposed stabilizer is evaluated by simulation using DigSilent PowerFactory

  • Implementation of a test microgrid in Barcelona

     Elias Alcega, Anna; Roman Barri, Manuel; Ruiz Alvarez, Albert; Cairo Molins, Josep Ignasi; Sumper, Andreas; Gomis Bellmunt, Oriol
    International Conference on Electricity Distribution
    Presentation's date: 2011-06
    Presentation of work at congresses

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  • Power extraction efficiency analysis of a multi turbine offshore wind farm connected to a single power converter

     de Prada Gil, Mikel; Gomis Bellmunt, Oriol; Sumper, Andreas
    European Wind Energy Conference and Exhibition
    Presentation's date: 2011-03-14
    Presentation of work at congresses

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  • Power smoothing of dfig wind turbines with flywheel

     Díaz González, Francisco; Sumper, Andreas; Gomis Bellmunt, Oriol; Martinez Rojas, Marcela
    European Wind Energy Conference and Exhibition
    Presentation's date: 2011-03-14
    Presentation of work at congresses

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  • Demand side management and electric vehicle integration (VERDE)

     Cruz Zambrano, Miguel; Cairó, Ignasi; Santandreu Corretgé, Albert; Sumper, Andreas; Mora Marin, Maria Rosa; Sudria Andreu, Antoni
    International Conference on Electricity Distribution
    Presentation's date: 2011-06
    Presentation of work at congresses

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  • Assessment of the impact of existing high voltage lines in urban areas

     Sumper, Andreas; Villafafila Robles, Roberto; Boix Aragonès, Oriol; Bergas Jane, Joan Gabriel; Sudria Andreu, Antoni
    International Conference on Modern Power Systems
    Presentation's date: 2011-05-18
    Presentation of work at congresses

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  • Regulación de la calidad en la actividad de distribución eléctrica: estudio de evaluación

     Santandreu Corretgé, Albert; Cruz Zambrano, Miguel; Sumper, Andreas; Sudria Andreu, Antoni
    Congreso de la Asociación Española para la Economía Energética
    Presentation's date: 2011-01-14
    Presentation of work at congresses

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  • Frequency control of isolated wind and diesel hybrid MicroGrid power system by using fuzzy logic controllers and PID controllers

     Marzband, Mousa; Sumper, Andreas; Gomis Bellmunt, Oriol; Pezzini, Paola; Chindris, Mircea
    International Conference on Electrical Power Quality and Utilisation
    Presentation's date: 2011-10-17
    Presentation of work at congresses

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  • Control for power conditioner based PEM fuel cell and back-up power system with supercapacitor

     Trujillo Caballero, Juan Carlos; Gomis Bellmunt, Oriol; Montesinos Miracle, Daniel; Sumper, Andreas; Sudria Andreu, Antoni; Junyent Ferré, Adrià
    International Conference on Electrical Power Quality and Utilisation
    Presentation's date: 2011-10-17
    Presentation of work at congresses

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    This paper presents a new control strategy to operate a Proton Exchange Membrane Fuel Cell (PEMFC) 1,2 kW and supercapacitor (SC) through a hybrid converter proposed. The Fuel Cell (FC) has a slow dynamic device by its nature; therefore it is recommended to have an additional auxiliary power such as the SC to improve system performance in all its applications. So has been made a study of the DC/DC converters as well as control strategies employed recently used to operate the FC and SC system. This paper shows an experimental validation of the system which has been simulated in Matlab-Simulink. For this two test have been proposed using different load demands of power and cut off FC power. Under disturbances from FC voltage and load voltage these tests are possible to verify that the system achieves an excellent output voltage (Vo) regulation and SC Voltage (VSC) control.