Comportamiento a fatiga de uniones a solape simple de acero prepintado y galvanizado con adhesivo silano modificado

(SPA) Se ha estudiado el comportamiento a fatiga de uniones adhesivas estructurales a solape simple. Los elementos estructurales fabricados en acero recubierto (galvanizado o pintado) sujetos a fluctuaciones de tensiones y deformaciones pueden fallar después de un número elevado de ciclos. El adhesivo silano modificado (MS) ha sido utilizado para la evaluación de la resistencia mecánica y a la fatiga de uniones de chapa delgada de acero protegido. El objetivo de este trabajo es analizar la influencia del recubrimiento en el comportamiento a fatiga de las uniones adhesivas con silano modificado. Las mejores propiedades se obtuvieron para el acero galvanizado con fallo cohesivo. Los resultados muestran que la compatibilidad química del adhesivo y la capa galvanizada mejoran la adhesión de la unión y la resistencia frente a cargas estáticas y dinámicas. Se ha obtenido el límite de fatiga para las uniones estudiadas. (ENG) The fatigue behaviour of single overlap of structural bonded joints was evaluated. Structural components made of thin coated steel (galvanised or painted) subjected to fluctuating stresses and strains may failure after a sufficient number of fluctuations. The modified silane adhesive (MS) has been used to evaluate the static and fatigue resistance of thin coated steel sheet joints. The aim of this paper is analyse the influence of coated on the fatigue behaviour of modified silane bonded joints. The best properties were obtained for galvanised steel with cohesive failure. The results show that chemical compatibility of adhesive and galvanized layer improve adhesion of joints and the mechanical resistance against static and dynamic loads. The fatigue limited has been obtained for joints studied.

Sistema Integrado de Gestión Académica

El Sistema Integrado de Gestión Académica consiste en una plataforma software modular orientada a apoyar la labor del profesorado en la gestión docente de las asignaturas impartidas por el Departamento de Mecánica de la Escuela Técnica Superior de Ingeniería y Diseño Industrial de la Universidad Politécnica de Madrid. Durante los últimos 5 años se ha trabajado en la creación de esta plataforma que se encuentra ahora en su recta final. Es necesario aclarar que toda la plataforma desde su inicio ha sido creada por el mismo autor y que debido al tiempo disponible para la realización del TFG, éste se ha centrado en realizar mejoras sobre lo ya desarrollado y en implementar uno de los módulos. El trabajo desarrollado comienza con un estudio de plataformas educativas online. Se han valorado las alternativas de Moodle y ATutor como posibles soluciones a los requisitos planteados llegando a la conclusión de que era necesario realizar un desarrollo a medida. La plataforma consta de 3 módulos principales:  Plataforma de Gestión Docente en Internet (PGDNet)  Aplicación de Notas (AdN)  Plataforma de Entrega de Prácticas Académicas (PEPA) PGDNet está orientado a la realización de pruebas de evaluación online. El profesor tiene a su alcance un conjunto de opciones que le permiten la creación de actividades y ejercicios de diferente índole, gestionar alumnos y establecer periodos de evaluación. El sistema recoge los resultados y corrige automáticamente permitiendo además exportar los resultados, manteniendo de esta manera la compatibilidad con otros sistemas informáticos de la UPM. PGDNet ofrece además un servicio de correo electrónico para realizar comunicaciones con grupos predefinidos de alumnos, un gestor documental enlazado con las diferentes actividades y un gestor de encuestas programable a medida. AdN se integra en la plataforma como un sistema para la gestión de calificaciones y permite mantener un historial del alumno. Las materias pueden dividirse en diferentes evaluaciones con un determinado peso sobre la calificación final. La nota total se calcula en tiempo real y de forma automática. El alumno puede entrar a consultar sus calificaciones en cualquier momento. El módulo ofrece a los profesores acceso simultáneo a introducir las calificaciones e importar notas guardadas de convocatorias pasadas. PEPA es el nuevo módulo que se añade a la plataforma y el que concentra los esfuerzos de desarrollo de este TFG. Se trata de un sistema de entrega de prácticas online que permite al profesor centralizar la recogida de documentación para su posterior corrección. PEPA dispone de un sistema de plantillas de respuestas fijas utilizadas en los laboratorios que son corregidas de forma automática en la entrega. Los 3 módulos se complementan entre sí compartiendo datos y permitiendo realizar importaciones y exportaciones de información con las aplicaciones actuales de Secretaría de alumnos como puede ser la introducción de listas de alumnos.---ABSTRACT---Academic Management Framework (Sistema Integrado de Gestión Académica) is a module‐oriented software application that aims to help teachers from ETSIDI Department from UPM to manage all information related to graduate courses. The software, which has been in continuous developing during the last 5 years, is now about to be finished. It must be pointed out the fact that the entire application has been designed and implemented by the same author. However, due to time schedule restrictions in this TFG (spanish acronym for “Graduation Project”), it has been focused on developing a few improvements in the software already implemented and creating a specific new module. In the beginning, this TFG includes an educational software comparative study. Moodle and ATutor have been selected as plausible assembled solutions that would fit the requirements given. Nonetheless, the conclusion ends up with rejecting both possibilities and moving the project towards a custom‐developed software. The application is divided in 3 modules:  Network Based Academic Management Platform (Plataforma de Gestión Docente en Internet ‐ PGDNet)  Evaluation Aid Tool (Aplicación de Notas ‐ AdN)  Academic Lab‐Work Delivery Platform (Plataforma de Entrega de Prácticas Académicas ‐ PEPA) PGDNet main purpose is handling online tests for students. There are a bunch of tools available for teachers that allow them to create activities and different types of exercises, manage students and set examination schedules. The system gathers the results and marks exercises automatically. Moreover, the teacher is able to export this information which is compatible with other UPM systems. PGDNet offers a mail service, a document management system and a survey application among others. AdN adds new features to the system. It helps teachers to manage student marks by keeping a history over the years. Subjects can be divided into little parts with a different weight in the final mark. Eventually, the mark is automatically calculated and published. The application can be accessed by both students and teachers simultaneously. This module is also ready to import old marks into the current course and allow all teachers to fill in the results at the same time. PEPA, which is a new module added from scratch, concentrate this TFG efforts. It consists of a practice delivery system that gathers all student documentation in a single site for easy correction. Besides, PEPA deploys an answer template repository for laboratory training. Students fill the templates and PEPA corrects them automatically on sending. These 3 modules are integrated in a single system that allows them to share data and import information such as student lists from the Administration Department.

SOPHIA CPV module round robin: power rating at CSOC

In the frame of the European project SOPHIA a concentrator photovoltaic (CPV) module measurement round robin has been initiated. The round robin includes measurements of four CPV modules at seven different test laboratories located in Europe. IV curves of the modules are measured with different measurement equipment under various climatic conditions. The aim of this activity is to perform at each site a rating of the modules at concentrator standard operating conditions CSOC according to IEC 62670-1. The outcome of the round robin is intended for direct feedback to the current draft standard IEC 62670-3 “Concentrator Photovoltaic (CPV) Performance Testing - Performance Measurements and Power Rating”. The paper discusses initial results from the first three partners that have already finished the measurements up to now.

Nuevos desarrollos en la medida de descargas parciales y técnicas avanzadas de análisis para el diagnóstico del estado de los aislamientos en sistemas eléctricos de alta tensión

En esta tesis se desarrolla una investigación sobre las técnicas de medida de descargas parciales (DP) que se aplican en medidas on-line, en condiciones normales de operación de las instalaciones eléctricas de alta tensión (AT). También se realiza un estudio de técnicas avanzadas de procesado y análisis de las señales medidas, que permiten realizar diagnósticos precisos del estado de los aislamientos eléctricos de AT. Uno de los objetivos fundamentales de la tesis ha sido disponer de un procedimiento eficaz de medida y procesado de las señales de DP, para la realización de medidas on-line tanto de forma itinerante, como mediante monitorización temporal o permanente. La implementación del nuevo procedimiento de medida permite obtener resultados satisfactorios en la detección, identificación y localización de defectos de aislamiento. Se ha dedicado especial interés al desarrollo de un método de clasificación de señales, que permite separar pulsos de ruido y diferentes fuentes de DP, presentes de forma simultánea en las instalaciones de AT. El estudio de la clasificación de señales se ha completado con la aplicación de un método para la detección de manera asistida, de los diferentes grupos de pulsos de ruido y de DP. La aplicación de este método de detección de grupos de pulsos, facilita la labor de los técnicos especialistas a la hora de diagnosticar el estado de los elementos aislantes. Al efecto de verificar de forma práctica las aportaciones de la tesis, se han realizado medidas de DP tanto en laboratorio como en campo. Las medidas experimentales en laboratorio se han efectuado en el Laboratorio de Alta Tensión de la Escuela Técnica Superior de Ingeniería y Diseño Industrial (LAT-UPM), de la Universidad Politécnica de Madrid. Por otro lado, las medidas experimentales en campo se han llevado a cabo en instalaciones de AT propiedad de compañías de transporte y distribución de energía eléctrica. La realización de ensayos de DP en estas instalaciones ha sido posible, gracias a los proyectos de investigación llevados a cabo por el grupo de trabajo del LAT-UPM, con diferentes empresas del sector durante los diez últimos años. ABSTRACT This thesis develops techniques for measuring partial discharges (PD) that are applied in on-line measurements, under normal operating conditions of the high voltage (HV) electrical installations. In addition there are studied advanced techniques for the processing and analysis of the measured signals, that permit precise diagnostics of the state of HV electrical insulation systems. One of the fundamental objectives of the thesis is to make available an effective procedure for measuring and processing PD signals, for making on-line measurements, either in an itinerant way or in temporary or permanent monitoring. The implementation of the new measurement procedure yields satisfactory results in the detection, identification and localization of insulation defects. Special attention has been devoted to the development of a method for classifying signals, that separates noise pulses and various PD sources present simultaneously in the HV installations. The study of the classification of signals has been completed by the application of a method for detecting, in a user assisted manner, the different groups of noise pulses and of PD. The application of this method for detecting groups of pulses facilitates the work of the specialist technicians to diagnose the condition of the insulation elements. To demonstrate the practical value of the thesis, PD measurements were made in laboratory as well as in field installations. The experimental measurements in laboratory were made in the High Voltage Laboratory (LAT-UPM) of the High Technical School of Engineering and Industrial Design, of the Polytechnic University of Madrid. Field measurements were realized in the HV installations of companies providing electrical energy transport and distribution. The realization of PD tests in these facilities was possible thanks to the research projects carried out by the working group of the LAT-UPM during the last ten years, with different companies operating in the sector.

Analysis of single and binary phases in cerium doped sodium bismuth titanate -Na0.5Bi0.5TiO3 materials

The pure and cerium doped sodium bismuth titanate inorganic powders were synthesized by solid state reaction method. The presence of rhombohedral phase was observed in cerium doped NBT compounds. At 1200 ºC, the 5% of cerium doped NBT compound forms single perovskite phase. The samples of x = 0.10 and 0.15 were heat treated to 1350 ºC, the binary phases with cerium and bismuth oxides were observed. The X-ray diffraction, fourier transform infrared spectroscopy, reflectance spectra, differential thermal analysis and thermo gravimetric analysis were used to analyze the various properties of samples. Moreover, the effects of cerium doping and calcining temperature on NBT samples were investigated. In this work we present our recent results on the synthesis and characterization of Ce doped sodium bismuth titanate materials.

Caracterización geométrica de huellas de dureza Brinell mediante equipos ópticos. Modelo con microscopía confocal

En esta tesis se desarrolla una metodología alternativa para la determinación de la dureza Brinell a partir de imágenes obtenidas mediante microscopía confocal, que se ha mostrado robusta para mejorar los resultados de medición del diámetro en condiciones de reproducibilidad. Las validaciones realizadas evidencian su posibilidad real de implementación, especialmente para la certificación de patrones de dureza. Los estudios experimentales realizados ponen de manifiesto que la medición del diámetro de una huella de dureza Brinell, siguiendo la metodología tradicional, depende de la posición del patrón, de las características del equipo empleado y del propio operador. Dicha medida resulta crítica y las dificultades para identificar el borde de la huella incorporan a menudo una fuente adicional de incertidumbre difícil de soslayar. En esta investigación se han desarrollado dos modelos matemáticos que permiten identificar de forma unívoca el diámetro de la huella en el punto donde se produce el límite de contacto entre el indentador y el material de la probeta durante la realización del ensayo. Ambos modelos han sido implementados en Matlab® y se ha verificado su validez mediante datos sintéticos. Asimismo, se ha realizado una validación experimental sobre patrones de dureza certificados, empleando un microscopio confocal marca Leica, modelo DCM 3D disponible en el Laboratorio de Investigación de Materiales de Interés Tecnológico (LIMIT) de la Escuela Técnica Superior de Ingeniería y Diseño Industrial de la Universidad Politécnica de Madrid (ETSIDI – UPM). Dicha validación ha puesto de manifiesto la utilidad de esta nueva metodología por cuanto permite caracterizar las huellas, estimar las incertidumbres de medida y garantizar la trazabilidad metrológica de los resultados. ABSTRACT This PhD thesis presents an alternative methodology to determine the Brinell hardness from the images obtained by confocal microscopy that has proved to be robust to improve the results of indentation diameter measurements in reproducibility conditions. The validations carried out show the real possibility of its implementation, especially for calibration of hardness reference blocks. Experimental studies performed worldwide show that the measurement of the indentation diameter in a Brinell hardness test depends, when the traditional methodology is applied, on the position of the test block, the equipment characteristics and the operator. This measurement is critical and the difficulties to identify the edge of the indentation often bring an additional source of uncertainty with them that is hard to avoid. In this research two specific mathematical models have been developed to identify unambiguously the indentation diameter at the point where the edge of the boundary between the indenter and the test block is found during the test. Both models have been implemented on Matlab® and their validity has been verified by synthetic data An additional experimental validation with calibrated hardness reference blocks has been carried out using a Leica-brand confocal microscope, model DCM 3D, available in the Laboratory for Research on Materials of Technological Interest (LIMIT in its Spanish acronym) of the Escuela Técnica Superior de Ingeniería y Diseño Industrial de la Universidad Politécnica de Madrid (ETSIDI-UPM). This validation has shown the utility of this new methodology since it allows to characterize the indentation, to estimate the measurement uncertainties and to ensure the metrological traceability of the results.

Metodología de formulación de indicadores para la mejora en la implantación de los programas de calidad. Aplicación al caso de las universidades públicas españolas

El planteamiento fundamental del trabajo ha consistido en explorar las posibilidades existentes para establecer una metodología basada en un modelo cuantitativo para la condensación de indicadores relacionados con los sistemas de calidad en el ámbito universitario público. El modelo incluye tanto la evaluación de activos tangibles como intangibles. Se ha seguido una metodología adaptada al planteamiento: - Realizando un estudio tipo DELPHI (DELPHI 1) entre las Unidades Técnicas de Calidad de las universidades de la Comunidad de Madrid, para conocer la situación de la implantación de metodologías de planificación estratégica en la universidad. - Definiendo tres niveles de gestión (bases, activos e indicadores) para la construcción del modelo cuantitativo. - Realizando una propuesta inicial de bases, activos e indicadores, incluyendo activos intangibles. - Realizando un segundo estudio tipo DELPHI (DELPHI 2) entre expertos con responsabilidad directiva en universidades, para debatir y revisar la propuesta. - Por último diseñando una metodología y la correspondiente herramienta para la condensación de los indicadores. En resumen, se ha generado una propuesta consolidada y actualizada de las bases estratégicas, los activos tangibles e intangibles y los indicadores en ambos casos, diseñándose una metodología (herramienta) que permite implementar la definición de los tres niveles de control, establecer una ponderación de cada uno de los elementos en los tres niveles y establecer una cuantificación de la importancia o contribución de cada elemento para la propia institución, y sirve para facilitar la toma de decisiones por priorización de actuaciones, establecer objetivos para los indicadores, valorar el grado de cumplimiento y modificar la estrategia de una institución universitaria. ABSTRACT The fundamental approach of the work has been to explore the possibilities to establish a methodology based on a quantitative model for condensing indicators related to quality assurance systems in Higher Education Institutions (HEI), particularly public universities. The model includes both assessment of tangible and intangible assets. A methodology adapted to the approach has been followed: - Performing a type DELPHI study (DELPHI 1) between the Technical Quality Units of the universities of the Community of Madrid, to know the level of implementation of strategic planning methodologies in HEI. - Defining three levels of management (bases, assets and indicators) to build the quantitative model. - Performing an initial proposal bases, assets and indicators, including intangible assets. - Making a second study type DELPHI (DELPHI 2) between experts with managerial responsibility in universities, to discuss and review the proposal. - Finally designing a methodology and related tool for condensing indicators. In short, a proposal consolidated and updated for strategic bases, the tangible and intangible assets and indicators of both types of assets has been performed. A methodology (tool) that allows to implement the definition of the three levels of control, establish a weighting each of the elements on three levels and establish a quantification of the importance and contribution of each element to the institution itself, has been designed. The methodology serves: - To facilitate decision-making by prioritizing activities. - To set targets for indicators. - To assess the degree of compliance and - To modify the strategy of the HEI.

Ricci flows on surfaces related to the Einstein weyl and Abelian vortex equations

There are described equations for a pair comprising a Riemannian metric and a Killing field on a surface that contain as special cases the Einstein Weyl equations (in the sense of D. Calderbank) and a real version of a special case of the Abelian vortex equations, and it is shown that the property that a metric solve these equations is preserved by the Ricci flow. The equations are solved explicitly, and among the metrics obtained are all steady gradient Ricci solitons (e.g. the cigar soliton) and the sausage metric; there are found other examples of eternal, ancient, and immortal Ricci flows, as well as some Ricci flows with conical singularities.

Measurement of plasma electron density generated in an experiment of laser shock processing, utilizing the H­α­-line

In this work we have realized plasma diagnosis produced by Laser (LPP), by means of emission spectroscopy in a Laser Shock Processing (LSP). The LSP has been proposed as an alternative technology, competitive with classical surface treatments. The ionic species present in the plasma together with electron density and its temperature provide significant indicators of the degree of surface effect of the treated material. In order to analyze these indicators, we have realized spectroscopic studies of optical emission in the laser-generated plasmas in different situations. We have worked focusing on an aluminum sample (Al2024) in air and/or in LSP conditions (water flow) a Q-switched laser of Nd:YAG (λ = 1.06 μm, 10 ns of pulse duration, running at 10 Hz repetition rate). The pulse energy was set at 2,5 J per pulse. The electron density has been measured using, in every case, the Stark broadening of H Balmer α line (656.27 nm). In the case of the air, this measure has been contrasted with the value obtained with the line of 281.62 nm of Al II. Special attention has been paid to the self-absorption of the spectral lines used. The measures were realized with different delay times after the pulse of the laser (1–8 μs) and with a time window of 1 μs. In LSP the electron density obtained was between 1017 cm−3 for the shortest delays (4–6 μs), and 1016 cm−3 for the greatest delays (7,8 μs).

Modelo para la medición con máquinas de visión e iluminación episcópica mediante la aplicación de técnicas de resolución subpíxel y aproximación bayesiana

En esta tesis se desarrolla un modelo físico-matemático, original, que permite simular el comportamiento de las máquinas de visión, en particular las máquinas ópticas digitales, cuando reciben información a través de la luz reflejada por los mensurandos. El modelo desarrollado se lia aplicado para la determinación de los parámetros que intervienen en el proceso de caracterización de formas geométricas básicas, tales como líneas, círculos y elipses. También se analizan las fuentes de error que intervienen a lo largo de la cadena metrológica y se proponen modelos de estimación de las incertidumbres de medida a través un nuevo enfoque basado en estadística bayesiana y resolución subpíxel. La validez del modelo se ha comprobado por comparación de los resultados teóricos, obtenidos a partir de modelos virtuales y simulaciones informáticas, y los reales, obtenidos mediante la realización de medidas de diferentes mensurandos del ámbito electromecánico y de dimensiones submilimétricas. Utilizando el modelo propuesto, es posible caracterizar adecuadamente mensurandos a partir del filtrado, segmentación y tratamiento matemático de las imágenes. El estudio experimental y validación definitiva de los resultados se ha realizado en el Laboratorio de Metrología Dimensional de la Escuela Técnica Superior de Ingeniería y Diseño Industrial de la Universidad Politécnica de Madrid. Los modelos desarrollados se han implementado sobre imágenes obtenidas con la máquina de visión marca TESA, modelo VISIO 300. Abstract In this PhD Thesis an original mathematic-physic model has been developed. It allows simulating the behaviour of the vision measuring machines, in particular the optical digital machines, where they receive information through the light reflected by the measurands. The developed model has been applied to determine the parameters involved in the process of characterization of basic geometrical features such as lines, circles and ellipses. The error sources involved along the metrological chain also are analyzed and new models for estimating measurement uncertainties through a new approach based on Bayesian statistics and subpixel resolution are proposed. The validity of the model has been verified by comparing the theoretical results obtained from virtual models and computer simulations, with actual ones, obtained by measuring of various measurands belonging to the electromechanical field and of submillimeter dimensions. Using the proposed model, it is possible to properly characterize measurands from filtering, segmentation and mathematical processing of images. The experimental study and final validation of the results has been carried out in the "Laboratorio de Metrología Dimensional" (Dimensional Metrology Laboratory) at the Escuela Técnica Superior de Ingeniería y Diseño Industrial (ETSIDI) (School of Engineering and Industrial Design) at Universidad Politécnica de Madrid (UPM). The developed models have been implemented on images obtained with the vision measuring machine of the brand TESA, model VISIO 300.

Closures of positive braids and the Morton-Franks-Williams inequality

We study the Morton-Franks-Williams inequality for closures of simple braids (also known as positive permutation braids). This allows to prove, in a simple way, that the set of simple braids is an orthonormal basis for the inner product of the Hecke algebra of the braid group defined by Kálmán, who first obtained this result by using an interesting connection with Contact Topology. We also introduce a new technique to study the Homflypt polynomial for closures of positive braids, namely resolution trees whose leaves are simple braids. In terms of these simple resolution trees, we characterize closed positive braids for which the Morton-Franks-Williams inequality is strict. In particular, we determine explicitly the positive braid words on three strands whose closures have braid index three.

An accurate model for simulating energetic behavior of PV grid connected inverters

This paper proposes a new model for characterizing the energetic behavior of grid connected PV inverters. The model has been obtained from a detailed study of main loss processes in small size PV inverters in the market. The main advantage of the used method is to obtain a model that comprises two antagonistic features, since both are simple, easy to compute and apply, and accurate. One of the main features of this model is how it handles the maximum power point tracking (MPPT) and the efficiency: in both parts the model uses the same approach and it is achieved by two resistive elements which simulate the losses inherent to each parameter. This makes this model easy to implement, compact and refined. The model presented here also includes other parameters, such as start threshold, standby consumption and islanding behavior. In order to validate the model, the values of all the parameters listed above have been obtained and adjusted using field measurements for several commercial inverters, and the behavior of the model applied to a particular inverter has been compared with real data under different working conditions, taken from a facility located in Madrid. The results show a good fit between the model values and the real data. As an example, the model has been implemented in PSPICE electronic simulator, and this approach has been used to teach grid-connected PV systems. The use of this model for the maintenance of working PV facilities is also shown.

Electrochemical study of platinum deposited by electron beam evaporation for application as fuel cell electrodes

Platinum is the most used catalyst in electrodes for fuel cells due to its high catalytic activity. Polymer electrolyte and direct methanol fuel cells usually include Pt as catalyst in their electrodes. In order to diminish the cost of such electrodes, different Pt deposition methods that permit lowering the metal load whilst maintaining their electroactivity, are being investigated. In this work, the behaviour of electron beam Pt (e-beam Pt) deposited electrodes for fuel cells is studied. Three different Pt loadings have been investigated. The electrochemical behaviour by cyclic voltammetry in H2SO4, HClO4 and in HClO4+MeOH before and after the Pt deposition on carbon cloth has been analysed. The Pt improves the electrochemical properties of the carbon support used. The electrochemical performance of e-beam Pt deposited electrodes was finally studied in a single direct methanol fuel cell (DMFC) and the obtained results indicate that this is a promising and adequate method to prepare fuel cell electrodes.

A novel ground fault non-directional selective protection method for ungrounded distribution networks

This paper presents a new selective and non-directional protection method to detect ground faults in neutral isolated power systems. The new proposed method is based on the comparison of the rms value of the residual current of all the lines connected to a bus, and it is able to determine the line with ground defect. Additionally, this method can be used for the protection of secondary substation. This protection method avoids the unwanted trips produced by wrong settings or wiring errors, which sometimes occur in the existing directional ground fault protections. This new method has been validated through computer simulations and experimental laboratory tests.

Toward a consolidation of the CPV-specific-test procedures for inverters

The inverter in a photovoltaic system assures two essential functions. The first is to track the maximum power point of the system IV curve throughout variable environmental conditions. The second is to convert DC power delivered by the PV panels into AC power. Nowadays, in order to qualify inverters, manufacturers and certifying organisms use mainly European and/or CEC efficiency standards. The question arises if these are still representative of CPV system behaviour. We propose to use a set of CPV – specific weighted average and a representative dynamic response to have a better determination of the static and dynamic MPPT efficiencies. Four string-sized commercial inverters used in real CPV plants have been tested.