Management of Mechanical Vibration and Temperature in Small Wind Turbines Using Zigbee Wireless Network

Por: A. D. Spacek, O. H. Ando Junior, J. M. Neto, V. L.Coelho, M. O. Oliveira, V. Gruber and L. Schaeffer

ABSTRACT

This paper presents the development of a methodology to manage the mechanic vibration and temperature from Small Wind Turbine (SWT). The objective with this research is propose a new diagnostic and protection tool through analysis and monitoring signals of vibration and temperature from wind turbines, aiming predict a need of preventive maintenance and mostly avoids catastrophic failures. For this feature the system will be composed of a Triple Axis accelerometer who will identify vibration, thermocouples to identify the temperatures at critical points of wind turbine, a microcontroller hardware which will make acquisition and processing of signals from sensors and finally a wireless transmission system using technology ZigBee. The post processing is performed remotely through a computer that receives the data submitted via wireless network presenting them to the user via graphical interface. The software of User friendly interface will have the functionality plus online display of received data also the possibility of storing and reporting data rates of vibration and temperature obtained during monitoring. Finally featuring the prototype of the hardware and software as well as some results
obtained in experimental scale.

IEEE Latin America Transactions, ISSN 1548-0992

Ver en:http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6502854&queryText%3DOliveira%2C+M.+O.

Evaluation of Alternative Disposal and Replacement of Fluorescent Lamps

POR: F. Carlessi, M. O. Oliveira, H. O. Ando Junior, J. M. Neto, A. D. Spacek, V. L. Coelho, L. Schaeffer, H. Bordon, O. E. Perrone, A. S. Bretas

ABSTRACT

This paper presents a evaluation of the disposal alternatives and substitution of the flourescent lights, in order to contribute with the correct recycling of this product. Initially presents a projection of how much eletricity can be saved by changing the most used lamps by the brazilian for LED lamps (Light-emitting diode). After, a economic viability evaluation also is presented in this study. Also a descriptionof the reciclyng methodologies and disposal of the flourescent lamps and the danger who may be caused for health, are presented with the final conclusions of this research.

Renewable Energy and Power Quality Journal (RE&PQJ), ISSN 2172-038X

Ver en: http://www.icrepq.com/RE&PQJ-11-4.html

Viability Study for Use of Rice Husk in Electricity Generation by Biomass

Por: M. O. Oliveira, J. M. Neto, M. C. Inocencio, O. H. Ando Junior, A. S. Bretas and O. E. Perrone

ABSTRACT

This paper presents the main technical and economic issues related to the study of a rice husk small-scale thermal power generation from a Southern Brazilian Rice Processing Cooperative Agriculture. In this study, a case study energy cogeneration associated with rice processing is presented with the estimated cost of operation and maintenance of a small pilot plant. It is also considered the impact of carbon credits sale inflow funds, which can reduce production costs related to electricity consumption. It will be presented also that the possibility of selling carbon credits, increases the project economic viability by 50%, allowing a reduction in the investment return time by 20%

 

Renewable Energy and Power Quality Journal (RE&PQJ), ISSN 2172-038X

Ver en: http://www.icrepq.com/RE&PQJ-10-12.html

Design and Analysis of Brushless Self-Excited Three-Phase Synchronous Generator

Por:  M. O. Oliveira, A. S. Bretas, F. H. García, L. A. Walantus, H. E. Muñoz, O. E. Perrone and J. H. Reversat

ABSTRACT

This paper presents the main features of design, construction, performance analyses and experimental studies of a brushless self-excited three-phase synchronous generator. The basic construction, principle of operation, and exciting characteristics are described. In proposed machine the rotor winding is shorted through diodes and the self-excitation is reached by a slip between rotor and stator winding built with different pole numbers. Computer simulations performed with MATLAB® software were used to verify the mathematical model of the brushless self-excited synchronous generator and the achieved results showed similar behavior with experimental values.

Renewable Energy and Power Quality Journal (RE&PQJ), ISSN 2172-038X

Ver en : http://www.icrepq.com/RE&PQJ-10-12.html

Characterization of Losses at the Distribution System

Por: Álvaro Coelho Bratti, Oswaldo Hideo Ando Junior, João Mota Neto, Anderson Diogo Spacek, Vilson Luiz Coelho, André Abelardo Tavares, Mario Orlando Oliveira

ABSTRACT

This paper shows the importance of the control and the mitigation of technical and non‐technical losses at electric energy distribution systems. For the classification and segmentation of such losses, the calculation methodology from the National Agency of Electric Energy (ANEEL) has been employed, presented at the seventh module of the Proceedings of Electric Energy Distribution at the National
Electric System (PRODIST). As for the application of the exposed methodology, a case study was conducted on the distributor CERSUL, which had not developed a study about losses classification before. It was possible to identify the frailty of the methodology when applied to small systems or
small size companies, since the results of the technical losses are different from the ones suggested by the bibliographical reference and the ones obtained during the measurements.

International Journal of Automation and Power Engineering (IJAPE), ISSN 2161-5055

Ver en: http://www.ijape.org/paperInfo.aspx?ID=9762

Study to Distributed Generation Deployment Using Photovoltaic System Connected in a Grid Residencial Consumer

Por: Oswaldo Hideo Ando Junior, Ricardo Macan, João Mota Neto, Mario Orlando Oliveira, Jose Horacio Reversat, Roberto Chouhy Leborgne

ABSTRACT

This paper presents a study on Photovoltaic System (PVS) and implementation on the electric network in a residential consumer.
In this sense, the rules and regulations for this type of Distributed Generation (DG) are presented. For this application two possible solutions are selected, the first with a PV system connected to the
network with 18 photovoltaic modules monocrystalline silicon, providing a power of 245 Wcc, and the second solution formed for a PVS connected to the network with 15 photovoltaic modules of 290 Wcc. The proposed solution validation is carried out using the simulation software System Advisor Model (SAM). Finally, the analyses results of possible solutions for the deployment of photovoltaic system are presented.

International Journal of Automation and Power Engineering (IJAPE), ISSN 2161-5055

Ver en: http://www.ijape.org/paperInfo.aspx?ID=9762

 

Analyze the Potential of Use Thermoelectric Materials for Power Cogeneration by Energy Harvesting ‐ Brazil

Por: Oswaldo Hideo Ando Junior, Anderson Diogo Spacek, João Mota Neto, Oscar Eduardo Perrone,
Mario Orlando Oliveira, Lirio Schaeffer

Abstract 

Thermoelectric materials have a physical behavior that enables the generation of energy. Therefore, his research aims at the formation and consolidation of knowledge about thermoelectric materials and their application of energy harvesting for cogeneration. Two laboratory experiments in this paper have been carried out to demonstrate the potential of this source of energy cogeneration. First of all, the simulation of the application of thermoelectric module in high temperature gradients was made and then the thermoelectric module was applied in a processor in the second experiment operation. The application processor provided unsatisfactory results due to the low temperature gradient. While the laboratory simulation, due to the high temperature gradient, gained desirable results for use in energy harvesting of the industrial processes. The Brazilian Potential for cogeneration of electricity, how Brazil consumes electricity in a year and how much would be possible to save have been examined if the thermoelectric modules were used in the ceramics industry, new cars and airplanes. The result was extremely
promising, resulting from the potential vehicles combustion. Furthermore, the cogeneration using thermoelectric modules is totally clean, avoiding the emission of carbon to the environment.

International Journal of Automation and Power Engineering (IJAPE), ISSN 2161-5055

Ver en : http://www.ijape.org/paperInfo.aspx?ID=9762

CONTROL DE TENSIÓN EN SISTEMAS DE GENERACIÓN EÓLICA USANDO GENERADORES DE INDUCCIÓN DOBLEMENTE ALIMENTADOS

El rápido crecimiento de la generación de energía eólica trae consigo nuevos requerimientos para la integración de turbinas eólicas a la red. Esto se debe a que en los últimos años alrededor del mundo,
las plantas de generación convencionales están siendo reemplazadas por plantas de generación eólica.
Dentro de los requerimientos se establece que estas nuevas tecnologías deben ofrecer servicios
auxiliares similares a los de las plantas convencionales, como lo es el control de tensión en estado
estable y también durante fallas cercanas a la planta de generación. En este trabajo se explora y compara el comportamiento de distintas alternativas de control de voltaje de un generador de inducción doblemente alimentado (DFIG), que es la tecnología de generación eólica más usada en la actualidad. Para ello se investiga el comportamiento de una red de transmisión ante una perturbación que pone en peligro la estabilidad de tensión de largo plazo de la misma. Para ello se considerará, en el primer caso, que el control de tensión de la barra terminal de la planta eólica se realizará únicamente a través del convertidor del lado del rotor, mientras que en el segundo caso, el control de tensión contará también con el aporte adicional de potencia reactiva entregada por el convertidor del lado de la red.
Los resultados mostrarán la importancia que tiene este aporte adicional de potencia reactiva para la estabilidad de tensión del sistema.

VER ARTICULO COMPLETO

Voltage Control in Wind Power Generation Using Doubly Fed Induction Generators

In recent years around the world, conventional generation  plants are being replaced by wind power plants.

The rapid development of wind power generation brings new requirements for the integration of wind turbines to the Electric Power Systems. These requirements establish that the new technologies must provide ancillary services similar to those of conventional plants, such as voltage control in steady state and voltage control during faults occurring close to the wind power plant. This paper explores and compares the performance of two different alternatives of voltage control using doubly fed induction generator (DFIG) topology, which is the most used wind generation technology nowadays.

This performance is investigated in a transmission network to a disturbance which endangers the
stability of long term voltage thereof. In the first case, the voltage control of the terminal bus of the wind plant will be performed only through the rotor‐side converter, while in the second case; the voltage control will also have the additional contribution of the reactive power delivered by the grid side converter.

The results show the importance of this additional contribution of the reactive power to voltage system stability.

VER ARTICULO/ SEE THE PAPER

Pressure pulsation in Kaplan turbines: Prototype-CFD comparison

Pressure pulsation phenomena in a large Kaplan turbine are investigated by means of numerical simulations (CFD) and prototype measurements in order to study the dynamic behavior of flow due to the blade passage and its interaction with other components of the turbine. Numerical simulations are performed with the commercial software Ansys CFX code, solving the incompressible Unsteady Reynolds-Averaged-Navier Stokes equations under a finite volume scheme. The computational domain involves the entire machine at prototype scale. Special care is taken in the discretization of the wicket gate overhang and runner blade gap. Prototype measurements are performed using pressure transducers at different locations among the wicket gate outlet and the draft tube inlet. Then, CFD results are compared with temporary signals of prototype measurements at identical locations to validate the numerical model. A detailed analysis was focused on the tip gap flow and the pressure field at the discharge ring. From a rotating reference frame perspective, it is found that the mean pressure fluctuates accordingly the wicket gate passage. Moreover, in prototype measurements the pressure frequency that reveals the presence of modulated cavitation at the discharge ring is distinguished, as also verified from the shape of erosion patches in concordance with the number of wicket gates.

 Autores: A. Rivetti, C. Lucino1, S. Liscia, D. Muguerza and F. Avellan

VER ARTICULO