Publications (8)0 Total impact
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Article: Characterization and visualization of voltage dips in wind power installations
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ABSTRACT: The purpose of this paper is to describe and assess a new characterization and classification method of voltage dips. The proposed method allows us to classify multistage and real voltage dips when measurement errors or transients are present in the recorded data. Different real voltage dips are used to assess this method, comparing the results with previous approaches. For visualization purposes, a voltage-space vector representation is introduced in order to clarify the global voltage dip evolution along the time. The classification of all the voltage dips, measured from a one-year field measurement campaign in wind farms located in the Spanish region of Castilla-La Mancha, is also presented and characterized according to the proposed method. This work was supported in part by the “Ministerio de Educación y Ciencia”—ENE2006-15422-C02-01/ALT, in part by ENE2006-15422-C02-02/ALT—, and in part by “Junta de Comunidades de Castilla-La Mancha” (PAI08-0145-9976). Paper no. TPWRD-00237-2008 -
Article: Phisically based modelling of induction lamps: aplication to the improvement of energy efficiency in the lighting system of a University building. Poster
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ABSTRACT: To manage efforts in energy efficiency, the Polytechnic University of Cartagena (UPCT) decided in 2003 to develop an ambitious project to reduce energy use intensity and costs during the period 2003-2008. To accomplish this objective in lighting end-use demand -one of the two main electrical uses together with space cooling/heating-, the UPCT joins, in July 2002, the U.E. GreenLight program as a partner. This paper describes the University experience in the second year (2003/04) of partnership in this UE initiative. The objectives were: to manage the demand, to improve the quality of lighting, working and environmental conditions, and reduce significantly energy and O&M expenses. Basically, the work developed in this year is focused in the change of conventional High Intensity Discharge (HID) lighting systems in classrooms (2000 m2) through the evaluation of advantages and drawbacks of different alternatives. The most promising one, the change to a new technology -165W induction lamps-, will be analyzed in detail in the paper. -
Article: Characterization and identification of electrical customers through the use of self-organizing maps and daily load parameters
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ABSTRACT: This paper shows the capacity of modern computational techniques such as the self-organizing map (SOM) as a methodology to achieve the classification of the electrical customers in a commercial or geographical area. This approach allows to extract the pattern of customer behavior from historic load demand series. Several ways of data analysis from load curves can be used to get different input data to “feed” the neural network. In this work, we propose two methods to improve customer clustering: the use of frequency-based indices and the use of the hourly load curve. Results of a case study developed on a set of different spanish customers and a comparison between the two approachs proposed here are presented. -
Article: Análisis y recostrucción de implantes mediante digitalación y generación de modelos 3D
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ABSTRACT: En la especialidad médica de estomatología, es frecuente el tratamiento ortodóncico de los pacientes con problemas dentales. Para un adecuado diagnostico y tratamiento de los problemas, es necesario disponer de una información exacta y completa de la disposición y forma de las piezas dentales del paciente, así como un software adecuado para la correcta manipulación de dicha información. En este trabajo, se presenta un sistema de escáner para piezas dentales que, junto con un software apropiado desarrollado por la empresa Navimetric y denominado Orthometric ©, permite al ortodentista disponer digitalmente de toda la información necesaria para un diagnóstico tridimensional rápido y preciso. Este trabajo ha sido realizado al amparo del Programa de Estímulo a la Investigación y Transferencia Tecnológica, PEITT-2002, de la Universidad Politécnica de Cartagena. Los autores agradecen el apoyo que la empresa Navimetric SL ha prestado durante el desarrollo de este proyecto. -
Article: An integrated tool for assessing the demand profile flexibility
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ABSTRACT: The purpose of this paper is to describe an integrated tool whose aim is to assess the residential demand profile flexibility through the control of space conditioning loads, mainly air conditioner and heat pump appliances. This assessment has been divided into two principal tasks—an estimation of the controllable load and a selection of the optimum load control strategy according to a target profile and a set of prefixed constraints. The tool also provides the aggregated load behavior, allowing a comparison between different load strategies. This tool can be applied from the customer’s and the utility’s side. An application example to a real environment is also presented. This work was supported by the Ministerio de Ciencia y Tecnología of Spain through Research Project DPI2001- 2779-C02-01. -
Article: Phisically based modelling of induction lamps: aplication to the improvement of energy efficiency in the lighting system of a University building
[show abstract] [hide abstract]
ABSTRACT: To manage efforts in energy efficiency, the Polytechnic University of Cartagena (UPCT) decided in 2003 to develop an ambitious project to reduce energy use intensity and costs during the period 2003-2008. To accomplish this objective in lighting end-use demand -one of the two main electrical uses together with space cooling/heating-, the UPCT joins, in July 2002, the U.E. GreenLight program as a partner. This paper describes the University experience in the second year (2003/04) of partnership in this UE initiative. The objectives were: to manage the demand, to improve the quality of lighting, working and environmental conditions, and reduce significantly energy and O&M expenses. Basically, the work developed in this year is focused in the change of conventional High Intensity Discharge (HID) lighting systems in classrooms (2000 m2) through the evaluation of advantages and drawbacks of different alternatives. The most promising one, the change to a new technology -165W induction lamps-, will be analyzed in detail in the paper. The authors would like to thank to the Ministerio de Eduación of Spanish Government for supporting this research under the Project DPI2001-2779-C02-01, as well to thank the European Union for their economic support. -
Article: Electrical thermal storage modeling: a tool to valuate new opportunities and bids for residential users in a deregulated market
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ABSTRACT: The purpose ofthis paper is to describe a useful tool for the initial analysis to assess the possibilities of residential Electric Thermal Storage (ETS), taking into account heat storage and cool storage devices. These load models are based on an energy balance between the indoor environment, the dwelling constructive parameters, the ETS device and the internal mass through a discrete statespace equation system. The main application of this load model has been oriented towards the simulation of ETS performance in order to evaluate the possibilities of Load Management in the new de-regulated structures of Electrical Power Systems. The proposed model has been implemented and validated for heat storage, using real data collected during the last years in residential areas to evaluate its accuracy and flexibility. Finally, a simulation case study is presented to show the possibilities of modifying the actual residential demand profile through a storage period re-scheduling proposed by the authors, taking into account the customer minimum comfort levels and avoiding program rejection. The work described in this paper is financially supported by the Ministerio de Ciencia y Tecnologia of Spain, through a research project (Ref. DP12001-2779-C02-01). The authors are very grateful to the Spanish company Gabarrón-Elnur S.A. for the generous cession of its commercial ETS appliances in order to test them and for its support to this research. -
Article: Characterization and visualization of voltage dips in wind power installations
[show abstract] [hide abstract]
ABSTRACT: The purpose of this paper is to describe and assess a new characterization and classification method of voltage dips. The proposed method allows us to classify multistage and real voltage dips when measurement errors or transients are present in the recorded data. Different real voltage dips are used to assess this method, comparing the results with previous approaches. For vi-sualization purposes, a voltage-space vector representation is in-troduced in order to clarify the global voltage dip evolution along the time. The classification of all the voltage dips, measured from a one-year field measurement campaign in wind farms located in the Spanish region of Castilla-La Mancha, is also presented and char-acterized according to the proposed method. Index Terms—Power quality (PQ), voltage dip, wind power gen-eration.
