Navegando por Assunto "Aerogeradores de pequeno porte"

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Acesso aberto (Open Access)
Bancada experimental para ensaios em geradores elétricos utilizados em aerogeradores de pequeno porte
(Universidade Federal do Pará, 2012-04-26) AZEVEDO, Thiago Paula Silva de; GALHARDO, Marcos André Barros; http://lattes.cnpq.br/6672470707462259; PINHO, João Tavares; http://lattes.cnpq.br/0847897516772421
This dissertation presents a test setup for electrical generators used in small wind turbines. The system is basically composed by an induction motor, which simulates a wind rotor, mechanically coupled to the electrical generator under test; a frequency inverter, used to change the motor speed; transducers of electrical parameters, for the measurement of the parameters of interest (instantaneous voltage and current) at the generator output; an angular velocity sensor for measuring the rotation of the motor shaft; a microcomputer, for monitoring and storing the measured parameters, and control the frequency inverter, through a software developed; a data acquisition board, which serves as the interface between the transducers/sensor and the microcomputer. The angular speed supplied to the generator can be varied according to the given wind speeds values, which are associated with corresponding values of rotation, in order to simulate the behavior of a wind rotor. Thus, it is possible to trace the power curve (power versus wind speed) of the tested generator and analyze its performance. Also presented in this work are the results of measurements made, using the developed setup of a small commercial generator (1 kW) and other developed in a research project, both axial flux permanent magnet machines.
Acesso aberto (Open Access)
Ferramenta computacional para análise do potencial de bombeamento de água utilizando aerogeradores de pequeno porte acoplados a motobombas por meio de inversores de frequência
(Universidade Federal do Pará, 2012-04-26) NASCIMENTO, Max Alexandre Seabra do; PINHO, João Tavares; http://lattes.cnpq.br/0847897516772421
The goal of this dissertation is to allow, through a computational tool, the analysis of the potential of a water pumping system based on the values of wind speeds in one location, using a small wind turbine coupled to a centrifugal pump through a variable speed drive. In the work two methods for the calculation of the flow are presented. Method 1 uses a theoretical model, while in method 2 the modeling is done from pumping data obtained in laboratory. The two methods describe the operation of a water pumping system involving the above equipment. Using the mathematical models described, a program was developed in Delphi® to obtain the values for the flow and volume of pumped water, and the number of people that can be supplied on the basis of the data of wind speed for the site, in order to analyze the feasibility of the system. The operation of the program is described through an example, in order to facilitate its understanding, which contains real values of wind speed, and the results are analyzed.