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Design and implementation of three-phase inverters using a TMS320F2812 digital signal processorLee, Duehee 08 September 2010 (has links)
The goal of this thesis project was to design and build a three-phase inverter controlled by the TMS320F2812 DSP by Texas Instruments. The TMS320F2812 is controlled in order to make inverters generate output waveforms which mimic the main reference signal coming from a computer. The project included building three different inverters on two platforms including auxiliary circuits and designing five pulse width modulation (PWM) switching algorithms for the inverters.
The motivation was that a newly designed inverter was required as an intermediary device between a computer and a laboratory-scaled model of a wind turbine. This type of wind turbine is used to educate students and engineers and to extract experimental wind power data. However, since commercial inverters don’t follow the main reference signal which is sent from the computer in order to operate the laboratory-scaled wind turbine, a controllable and variable inverter needed to be designed to receive that signal.
The results are as follows. The voltage source inverter (VSI) and the current-controlled voltage source inverter (CC-VSI) were built on the VSI platform, and the current source inverter (CSI) was built on the CSI platform. Furthermore, the TMS320F2812’s analog digital converter (ADC) driver circuit and the output LC filter were also designed as auxiliary circuits. Five PWM switching programs were written; three switching algorithms for the VSI, and one algorithm each for the CC-VSI and the CSI. The output waveforms from the combination of hardware and software mentioned above were captured, and they follow the main reference signal very well. Although each of the inverters performed well, the VSI in combination with the Space Vector PWM switching algorithm produced the cleanest output voltage waveforms with the least amount of noise.
The inverters built in this thesis project can be applied to the laboratory-scaled wind turbine, the maximum power tracking in solar panels, and equipment for analyzing digital signal processing. However, before using the inverters in those applications, much work remains to be done to solve the problems related to the signal distortion caused by the dead band time, harmonic signals caused by the fixed switching frequency, and the reliability issues caused by mounting on the bread board.
In conclusion, although this thesis does not illustrate the entire process of or explain every requirement for building the three inverters, enough information about the topology of the inverters, the hardware design, and the PWM switching algorithms is provided in this thesis to enable one to remake all three of the three-phase inverters. / text
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Regulador eletromagn?tico de frequ?ncia aplicado no controle de velocidade de geradores e?licosSilva, Paulo Vitor 11 May 2015 (has links)
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Previous issue date: 2015-05-11 / A necessidade constante de novas fontes de energias renov?veis vem promovendo
cada vez mais o aumento de investimentos nessa ?rea. Dentre essas fontes, a energia
e?lica vem tomando grande destaque. Torna-se importante promover a busca pelo aprimoramento
das tecnologias envolvidas nas topologias de aerogeradores, buscando alternativas
que aumentem o rendimento obtido, apesar da irregularidade da velocidade do
vento.
Este trabalho apresenta um novo sistema para controle de velocidade, aqui aplicado
em aerogeradores, o Regulador Eletromagn?tico de Frequ?ncia (REF). Um dos dispositivos
mais utilizados em algumas topologias s?o as caixas de engrenagens mec?nicas
que, al?m de uma vida ?til curta, representam frequentemente, fontes de ru?do e defeitos.
O REF dispensa essas caixas de transmiss?o, representando um avan?o tecnol?gico, utilizando
para isso uma m?quina de indu??o adaptada, na qual o estator passa a ser m?vel,
solid?rio ao eixo da turbina.
Na topologia utilizada neste trabalho, o REF tamb?m permite dispensar o uso de conversores
eletr?nicos para estabelecer o acoplamento entre o gerador e a rede el?trica,
raz?o pela qual tamb?m proporciona a possibilidade de obten??o de gera??o em corrente
alternada, com tens?o e frequ?ncia constantes, onde n?o exista a rede el?trica.
Respons?vel pelo controle da velocidade mec?nica do gerador, o REF pode ser ?til
em outros sistemas de transmiss?o onde o controle de velocidade mec?nica de sa?da seja
o objetivo.
Al?m disso, por operar atrav?s da combina??o de duas entradas, uma mec?nica e outra
el?trica, o REF multiplica as possibilidades de aplica??es por ser apto ao acoplamento
sin?rgico entre energias de matrizes diferentes, e, por tais motivos, possibilita que as diversas
fontes de energia envolvidas sejam desacopladas da rede, sendo o gerador s?ncrono
o respons?vel pela conex?o do sistema com a rede el?trica, simplificando as estrat?gias
de controle quanto ? pot?ncia injetada na mesma.
Resultados de simula??o e experimentais s?o apresentados no decorrer do trabalho,
voltados a um aerogerador, validando a proposta em rela??o a efici?ncia no controle de
velocidade do sistema para diferentes condi??es de vento. / The constant necessity for new sources of renewable energy is increasingly promoting
the increase of investments in this area. Among other sources, the wind power has
been becoming prominent. It is important to promote the search for the improvement of
the technologies involved in the topologies of the wind turbines, seeking for alternatives
which enhance the gotten performance, despite the irregularity of the wind speed.
This study presents a new system for speed control, in this case applied to the wind
turbines - the Electromagnetic Frequency Regulator (EFR). One of the most used devices
in some topologies is the mechanical gearboxes which, along with a short service life,
often represent sources of noise and defects. The EFR does not need these transmission
boxes, representing a technological advancement, using for that an adapted induction
machine, in which the stator becomes mobile, supportive to the axis of the turbine.
In the topology used in this study, the EFR also allows us to leave out the usage of the
eletronic converters to establish the coupling between the generator and the electrical grid.
It also the reason why it provides the possibility of obtaining the generation in alternating
current, with constant voltage and frequency, where there is no electrical grid.
Responsable for the mechanical speed control of the generator, the EFR can be useful
in other transmission systems in which the mechanical speed control output is the
objective.
In addition, the EFR operates through the combination of two inputs, a mechanical
and other electrical. It multiplies the possibilities of application because it is able
to synergistic coupling between different arrays of energy, and, for such reasons, it enables
the various sources of energy involved to be uncoupled from the network, being
the synchronous generator responsible for the system connection with the electrical grid,
simplifying the control strategies on the power injected in it.
Experimental and simulation results are presented through this study, about a wind
turbine, validating the proposal related to the efficience in the speed control of the system
for different wind conditions.
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