TRABALHOS FUTUROS

A realização deste trabalho teve a principal função de apresentar uma revisão bi- bliográfica acerca dos métodos utilizados para a redução de cargas mecânicas em turbinas eólicas de grande porte e o projeto de um sistema IPC utilizando controlador RMRAC, para a frequência de 1p. Dada a complexidade e multidisciplinaridade dos temas abor- dados, as possibilidades de evolução são muito amplas, com destaque para os seguintes assuntos:

• Avaliar as cargas medidas conforme a norma IEC 61400-13.

• Desenvolver o projeto do sistema IPC para frequências de 2p e 3p.

• Estudar os reflexos em termos de variação de potência de geração resultantes da adição do IPC nas turbinas eólicas.

• Avaliar os resultados de eventos de Low Voltage Ride Through (LVRT), isto é, du- rante períodos curtos de falha da rede elétrica como curto-circuito ou queda de tensão, utilizando o IPC.

• Desenvolver algoritmos de desligamento e religamento da turbina eólica para uma transição suave entre as regiões de operação 3 e 4.

Outros tópicos que se mostraram viáveis compreendem a investigação da utilização de observadores de estado para melhorar a qualidade das medidas, visto que um dos problemas do IPC, principalmente nas frequências superiores a 1p, é obter a medida das cargas mecânicas de forma antecipada com vistas a compensar o atraso do sistema mecânico de variação de passo das pás.

Em termos de implementação de tecnologia, é necessário avaliar também o equi- líbrio entre o benefício promovido pelo IPC e a sua contrapartida, cujos principais itens são o desgaste dos rolamentos das raízes das pás e o consumo de energia necessário para manter a constante atividade do mecanismo atuador de passo das pás da turbina eólica. Neste contexto, há possibilidade de desenvolver algoritmos de otimização, de acordo com as condições operacionais, que controlem, online, a intensidade de atuação do IPC.

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