Programmable PFC based hybrid multipulse power rectifier for utility interface of power electronic converters

In this paper it is proposed a novel hybrid three-phase rectifier capable to achieve high input power factor (PF), and low total harmonic distortion in the input currents (THDI). The proposed hybrid high power rectifier is composed by a standard three-phase 6-pulses diode rectifier (Graetz bridge) with a parallel connection of single-phase Boost rectifiers in each three-phase rectifier leg. Such topology results in a structure capable of programming the input current waveform and providing conditions for obtaining high input power factor and low harmonic current distortion. In order to validate the proposed hybrid rectifier, this paper describes its principles of operation, with detailed experimental results and discussions on power rating of the required Boost converters as related to the desired total harmonic current distortion. It is demonstrated that only a fraction of the output power is processed through the Boost converters, making the proposed solution economically viable for very high power installations, with fast pay back of the investment. Moreover, retrofitting to existing installations is also feasible since the parallel path can be easily controlled by integration with the existing de-link. A prototype rated at 6 kW has been implemented in laboratory and fully demonstrated its operation, performance and feasibility to high power applications. © 2005 IEEE.

Response of the stingless bee manduri do mato grosso (Melipona favosa orbignyi, Hymenoptera, Apidae) to variable concentrations of sucrose in artificial feeding sources of different colors

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Proposals for improvement of methodology and process of collecting and analyzing compatibility of power quality indicators in distribution systems

This article aims to present proposals for improvement of key standards and resolutions concerned about the methodology for calculating the indicator of total harmonic voltage distortion, and should contribute to the process of examining the compatibility of potentially disturbing loads in electric power quality in distribution systems. These proposals were drawn from the analysis of results from measurement campaigns conducted in a case study including analysis of the connection of a new induction furnace in a foundry served by a distributor of São Paulo state. A general historical situating the quality of electric energy in the electricity sector is presented, and methodological guidelines and procedures used in experimental trials are shown. The analysis and discussion of results are prepared to answer the main questions that arise during the implementation of standards, resolutions and procedures. © 2011 IEEE.

Resolución 437(XIX): Acceso a las fuentes de información = Resolution 437(XIX): Access to sources of information = Résolution 437(XIX): Accès aux sources d'information

Publicado separadamete en cada idioma

United Nations Conference on New and Renewable Sources of Energy: its relevance for CDCC Member States

Includes bibliography

Analysis of the lightning attractive radius of power transmission lines through the use of a physically-oriented model

Models of different degrees of complexity are found in the literature for the estimation of lightning striking distances and attractive radius of objects and structures. However, besides the oversimplifications of the physical nature of the lightning discharge on which most of them are based, till recently the tridimensional structure configuration could not be considered. This is an important limitation, as edges and other details of the object affect the electric field and, consequently, the upward leader initiation. Within this context, the Self-consistent leader initiation and propagation model (SLIM) proposed by Becerra and Cooray is state-of-the-art leader inception and propagation leader model based on the physics of leader discharges which enables the tridimensional geometry of the structure to be taken into account. In this paper, the model is used for estimating the striking distance and attractive radius of power transmission lines. The results are compared with those obtained from the electrogeometric and Eriksson's models. © 2003-2012 IEEE.

Economic criteria for the selection and development of power stations and electricity systems

Includes bibliography

Some problems arising from the development of power stations and electricity systems

Includes bibliography

Some economic considerations in the design, commissioning and operation of power stations containing large generating units

Includes bibliography

Plan regional de acción en materia de fuentes de energía nuevas y renovables = Regional plan of action on new and renewable sources of energy

Incluye Bibliografía

Ejecución del Plan de Acción de Río de Janeiro para la Cooperación entre Países en Vías de Desarrollo en el Campo de las Fuentes de Energía Nuevas y Renovables" = Implementation of the "Rio de Janeiro Plan of Action for the Co-operation among Developing Countries in the Field of New and Renewable Sources of Energy""

Señala algunas actividades concretas que podrían iniciar los países en desarrollo para la cooperación en el campo de las fuentes de energía nuevas y renovables. Dichas actividades consisten en una serie de programas que, según su naturaleza, se clasifican en: a) programa de planificación energética, b) programa de desarrollo científico y tecnológico, y c) programas de apoyo comunes.

Report on the Consultative Meeting for the Promotion of Latin American and Caribbean Projects in the Area of New and Renewable Sources of Energy = Informe sobre la Reunión Consultiva para la Promoción de Proyectos de América Latina y el Caribe en la Esfera de las Fuentes de Energía Nuevas y Renovables

Informe de la reunion consultiva sobre promocion de proyectos de America Latina y el Caribe en el area de fuentes de energia nuevas y renovables. Contiene el resumen de los debates y conclusiones acerca del conjunto de proyectos presentados por OLADE y CARICOM.