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Doctoral Thesis
DOI
https://doi.org/10.11606/T.3.2020.tde-05032021-084033
Document
Author
Full name
Rafael Bittencourt Aguiar Cunha
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2020
Supervisor
Committee
Sguarezi Filho, Alfeu Joãozinho (President)
Gonçalves, Flávio Alessandro Serrão
Monteiro, José Roberto Boffino de Almeida
Fernandes, Darlan Alexandria
Monaro, Renato Machado
Title in Portuguese
Controle preditivo do tipo finite control set aplicado ao conversor elevador de um sistema fotovoltaico com operação em frequência constante.
Keywords in Portuguese
Controle preditivo
Frequência de chaveamento constante
Sistemas fotovoltaicos
Abstract in Portuguese
Este trabalho propõe uma técnica de controle Finite Control Set Model Predictive Control com frequência de chaveamento constante, aplicado ao conversor elevador de um sistema fotovoltaico. A proposta tem como principal objetivo apresentar uma metodologia para a operação com frequência de chaveamento constante que proporcione maior simplicidade ao projeto, em comparação com as soluções observadas na literatura até o presente. O controlador apresenta duas malhas de controle. A malha externa de controle de tensão emprega a referência de tensão obtida pelo algoritmo de rastreamento do ponto de máxima potência e calcula a corrente prevista a partir do modelo do sistema. A malha interna de controle de corrente obtém uma função custo a partir das taxas de variação da corrente no indutor, realizando a predição da razão cíclica a partir da referência de corrente obtida na malha externa e garantindo frequência de chaveamento constante. Os resultados experimentais são obtidos a partir de teste em bancada, apresentando desempenho superior em comparação com um controlador de dois polos e dois zeros, observando tempo de acomodação, sobressinal e erro de regime permanente.
Title in English
Finite control set-model predictive control Applied to the boost convertr of a photovoltaic system with constant frequency operation.
Keywords in English
Constant switching frequency
Finite control set - model predictive control
Photovoltaic system
Predictive control
Abstract in English
This work proposes a Finite Control Set Model Predictive Control technique with constant switching frequency applied to the boost converter of a photovoltaic system. The proposal has as main objective to present a methodology for the operation with constant switching frequency that provides greater simplicity to the project, in comparison with the solutions observed in the literature until the present. The controller has two control loops. The outer voltage control loop uses the voltage reference obtained by the maximum power point tracking algorithm and calculates the predicted inductor current from the system model. The inner current control loop obtains a cost function based on the current variation rates in the inductor, making the prediction of the duty cycle based on the current reference obtained in the outer loop and guaranteeing a constant switching frequency. The experimental results are obtained from a bench test, showing superior performance in comparison with a two-pole and two-zero controller, observing settling time, overshoot and steady-state error.
 
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Publishing Date
2021-03-19
 
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