Uma proposta de regulador automático de tensão microcontrolado para geradores síncronos isolados

• Ano de defesa: 2016
• Autor(a) principal: Alves, Guilherme Henrique
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Uberlândia; Brasil; Programa de Pós-graduação em Engenharia Elétrica
• Palavras-chave em Português: Engenharia elétrica; Dínamos - Corrente alternada; Microcontroladores; Gerador síncrono isolado; Regulador automático de tensão; Microcontrolador PIC; Sistema de excitação; Isolated synchronous generator; Automatic voltage regulator; PIC microcontroler; Excitation system; CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA
• Link de acesso: https://repositorio.ufu.br/handle/123456789/17931; http://doi.org/10.14393/ufu.di.2016.520

The excitation control systems in synchronous machines must very quickly detect changes caused by load increase on the isolated generator and act on the excitation system in a rapid and efficient way in order to maintain terminal voltage at optimal desired levels. Unlike other works related with this area which used analog-based electronic circuits, this controller can in many case be built utilizing microcontrolled technology which is more efficient and flexible to implement different control strategies, as well as having a low cost of production. The approach of this research consists in a proposal to apply an automatic excitation controller, utilizing a PID control loop, including manual adjustments and monitorings of terminal voltage and stator temperature of the machine. It employs a PIC16F877A microcontroller from the Microchip Technology Company. The results obtained through practical tests in laboratory with a direct online start of induction motors (1 and 2 HP) on a 2 kVA generator show that the controller acts to recover the terminal voltage to the adopted setpoint in a reduced time. Finally, the results were also compared to the time of response provided from another well-known automatic voltage regulator found in the market, in order to prove the good control performance of this project.