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  • Analysis of Two Interpolation Methods of H∞ Controllers for Robust Wind Turbine Control
    presents the design process of two collective pitch angle controllers based on different interpolation methods of three Linear Time Invariant LTI H controllers to improve the generator speed regulation in the above rated power production zone The control dynamics vary according to a selected parameter which changes in the different operating points of the above rated zone as for example the collective pitch angle in blades One interpolation method develops a gain scheduling of the controller s state space matrices by polynomials approximations where the controller is represented by Linear Fractional Transformation LFT The other interpolation method solves complex a Linear Matrix Inequalities LMI system which guarantees the closed loop stability during the transitions The selected wind turbine non linear model to design these controllers has been developed in GH Bladed v4 00 and it is based on the offshore 5 MW wind turbine defined in the Upwind European project The two gain scheduled controllers are validated in GH Bladed and an exhaustive analysis is developed to calculate the load reduction rate in wind turbine components compared to a baseline robust control based strategy previously defined IK4 Ikerlan Organización y equipo Resultados Infraestructuras y equipamiento Desarrollo profesional IK4 Research Alliance

    Original URL path: http://www.ikerlan.es/es/actualidad/papers-tesis/analysis-of-two-interpolation-methods-of-h-controllers-for-robust-wind-turbine-control (2016-02-15)
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  • Evaluation of Storage Energy Requirements for Constant Production in PV Power Plants
    H Bilbao E Belenguer E Etxeberria Otadui I Rodriguez P This paper analyzes the minimum energy capacity ratings that an energy storage ES system should accomplish in order to achieve a defined constant power production in a photovoltaic PV power plant ES is a key issue for the further integration of intermittent and stochastic renewable energy sources which are not currently dispatchable due to their dependence on real time weather conditions as is the case of PV technology This paper proposes and describes an energy management strategy EMS for operating PV power plants with ES in the future The goal of this EMS is to endow these power plants with a constant production that can be controlled and hence traded on electricity markets This paper presents simulated results on the percentage of time throughout the year during which a large scale PV ES plant operates properly with different ES ratings and according to different configurations of this EMS Finally a test bench was developed and experimental results validating this EMS were obtained IK4 Ikerlan Organización y equipo Resultados Infraestructuras y equipamiento Desarrollo profesional IK4 Research Alliance Mondragón Corporación I D para empresas Desarrollo de productos y servicios Eficiencia energética y

    Original URL path: http://www.ikerlan.es/es/actualidad/papers-tesis/evaluation-of-storage-energy-requirements-for-constant-production-in-pv-power-plants (2016-02-15)
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  • Optimal Energy Management of an Improved Elevator with Energy Storage Capacity based on Dynamic Programming
    Transactions on Volume PP Issue 99 2013 Bilbao E Barrade P Etxeberria Otadui I Rufer A Luri S Gil I Efficiency and energy consumption reduction are becoming a key issue in elevation applications Energy Storage Systems ESS can play a significant role in this field together with their associated Energy Management Strategy EMS in order to optimize the overall behavior of the elevator This paper presents an EMS based on Dynamic Programming DP for a stochastic application where the cost function is based on the stock management theory For that purpose an implementation methodology for DP based EMS is also proposed That methodology has been applied on an elevator where the system modeling has been carried out Due to the stochastic behavior of the application a novel representation method is also presented General Energy and Statistical Description The EMS has been implemented and validated experimentally on a real elevator with energy storage capability reducing grid power peaks by 65 and braking resistor energy losses up to 84 IK4 Ikerlan Organización y equipo Resultados Infraestructuras y equipamiento Desarrollo profesional IK4 Research Alliance Mondragón Corporación I D para empresas Desarrollo de productos y servicios Eficiencia energética y almacenamiento de energía Eficiencia operativa

    Original URL path: http://www.ikerlan.es/es/actualidad/papers-tesis/optimal-energy-management-of-an-improved-elevator-with-energy-storage-capacity-based-on-dynamic-programming (2016-02-15)
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  • Comparison of fast permanent magnet flux estimation methods for railway traction application PMSMs
    Two fast online Permanent Magnet Synchronous Machine PMSM flux estimation methods reactive power feedback and extended Kalman filter based methods are analyzed and compared from machine real torque optimization point of view The analysis has been carried out firstly in simulation and afterwards it has experimentally been validated on a 120kW SPMSM railway traction prototype IK4 Ikerlan Organización y equipo Resultados Infraestructuras y equipamiento Desarrollo profesional IK4 Research Alliance Mondragón

    Original URL path: http://www.ikerlan.es/es/actualidad/papers-tesis/comparison-of-fast-permanent-magnet-flux-estimation-methods-for-railway-traction-application-pmsms (2016-02-15)
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  • Comparison of multi-phase SAB converters vs. multi-phase SRC converters
    multi phase medium frequency MF dc dc converters a single active bridge SAB and series resonant converter SRC Moreover a new parametric model of SAB converters is developed where the number of phases is a parameter within the expressions The analytical comparison is verified with simulation and experimental results using PLECS software and a 10kW 20kHz 500V laboratory prototype IK4 Ikerlan Organización y equipo Resultados Infraestructuras y equipamiento Desarrollo profesional

    Original URL path: http://www.ikerlan.es/es/actualidad/papers-tesis/comparison-of-multiphase-sab-converters-vs-multiphase-src-converters (2016-02-15)
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  • Design and development of a PEBB for a medium voltage 8MVA IGCT based converter
    of a PEBB for a medium voltage 8MVA IGCT based converter Power Electronics and Motion Control Conference EPE PEMC 2012 15th International San Sebastian J Azurmendi J M Perez de Arenaza I Rujas A Etxeberria Otadui I In this paper the design and development of a Power Electronic Building Block PEBB of a 3 3kV 8MVA grid connected converter is presented The main electrical thermal and mechanical aspects of the PEBB design are described First the selection of the most appropriate semiconductor and topology is discussed according to the converter specifications Second the implemented Selective Harmonic Modulation strategy is detailed Third the electromechanical design based on PEBBs is described and last electro thermal models are developed to evaluate the worst case losses of each semiconductor as well as the cooling requirements Finally the construction of the full scale single leg test setup is described and the design and models are validated experimentally IK4 Ikerlan Organización y equipo Resultados Infraestructuras y equipamiento Desarrollo profesional IK4 Research Alliance Mondragón Corporación I D para empresas Desarrollo de productos y servicios Eficiencia energética y almacenamiento de energía Eficiencia operativa y fabricación avanzada IK4 IKERLAN Inspira En qué investigamos Sistemas embebidos Sistemas eléctricos y electrónicos

    Original URL path: http://www.ikerlan.es/es/actualidad/papers-tesis/design-and-development-of-a-pebb-for-a-medium-voltage-8mva-igct-based-converter (2016-02-15)
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  • A Stationary Reference Frame Grid Synchronization System for Three-Phase Grid-Connected Power Converters Under Adverse Grid Conditions
    IEEE Transactions on Volume 27 Issue 1 2012 Rodri guez P Luna A Muñoz Aguilar R S Etxeberria Otadui I Teodorescu R Blaabjerg F Grid synchronization algorithms are of great importance in the control of grid connected power converters as fast and accurate detection of the grid voltage parameters is crucial in order to implement stable control strategies under generic grid conditions This paper presents a new grid synchronization method for three phase three wire networks namely dual second order generalized integrator SOGI frequency locked loop The method is based on two adaptive filters implemented by using a SOGI on the stationary αβ reference frame and it is able to perform an excellent estimation of the instantaneous symmetrical components of the grid voltage under unbalanced and distorted grid conditions This paper analyzes the performance of the proposed synchronization method including different design issues Moreover the behavior of the method for synchronizing with highly unbalanced grid is proven by means of simulation and experimental results demonstrating its excellent performance IK4 Ikerlan Organización y equipo Resultados Infraestructuras y equipamiento Desarrollo profesional IK4 Research Alliance Mondragón Corporación I D para empresas Desarrollo de productos y servicios Eficiencia energética y almacenamiento de energía Eficiencia

    Original URL path: http://www.ikerlan.es/es/actualidad/papers-tesis/a-stationary-reference-frame-grid-synchronization-system-for-threephase-gridconnected-power-converters-under-adverse-grid-conditions (2016-02-15)
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  • Optimal design and experimental validation of a Medium-Frequency 400kVA power transformer for railway traction applications
    design and experimental validation of a Medium Frequency 400kVA power transformer for railway traction applications Energy Conversion Congress and Exposition ECCE 2012 IEEE Villar I Mir L Etxeberria Otadui I Colmenero J Agirre X Nieva T This paper presents the application of a Medium Frequency MF Transformer design methodology applied to a 400kVA transformer intended for railway traction multi voltage applications First a full scale prototype operating at a moderate frequency 1kHz based on a silicon steel transformer and a Dual Active Bridge DAB has been developed and experimentally verified Then in order to reduce the volume and weight of the system a second full scale prototype has been designed based on a higher operation frequency 5kHz a nanocrystalline transformer and a Series Resonant Converter SRC which has evolved towards a LLC Resonant Converter A major volume and weight reduction more than 85 has been achieved between both designed transformers IK4 Ikerlan Organización y equipo Resultados Infraestructuras y equipamiento Desarrollo profesional IK4 Research Alliance Mondragón Corporación I D para empresas Desarrollo de productos y servicios Eficiencia energética y almacenamiento de energía Eficiencia operativa y fabricación avanzada IK4 IKERLAN Inspira En qué investigamos Sistemas embebidos Sistemas eléctricos y electrónicos de potencia

    Original URL path: http://www.ikerlan.es/es/actualidad/papers-tesis/optimal-design-and-experimental-validation-of-a-mediumfrequency-400kva-power-transformer-for-railway-traction-applications (2016-02-15)
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