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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Ajuste de controlador PI mmbarcado em CLP baseado em estimativa de robustez

Rego, Everton Jos? de Castro 22 December 2017 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2018-04-02T12:36:22Z No. of bitstreams: 1 EvertonJoseDeCastroRego_DISSERT.pdf: 3619677 bytes, checksum: e83c6f152657a4cdb446e3b03e645829 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2018-04-04T13:01:53Z (GMT) No. of bitstreams: 1 EvertonJoseDeCastroRego_DISSERT.pdf: 3619677 bytes, checksum: e83c6f152657a4cdb446e3b03e645829 (MD5) / Made available in DSpace on 2018-04-04T13:01:53Z (GMT). No. of bitstreams: 1 EvertonJoseDeCastroRego_DISSERT.pdf: 3619677 bytes, checksum: e83c6f152657a4cdb446e3b03e645829 (MD5) Previous issue date: 2017-12-22 / O controle autom?tico de processos ? uma demanda crescente nas ind?strias que buscam t?cnicas que automatizem a sintonia dos sistemas de controle e que garantam efici?ncia, qualidade e seguran?a. Este trabalho tem como objetivo implementar um m?todo de avalia??o e ressintonia de controladores PI em Controlador L?gico Program?vel (CLP), a fim de melhorar a robustez do sistema. O m?todo ? inspirado em trabalhos j? existentes na literatura e possui duas etapas, a primeira etapa ? de avalia??o de robustez do controlador, em que se estima suas margens de ganho e de fase. Na segunda etapa, os par?metros do controlador PI s?o corrigidos para assegurar que os crit?rios de robustez n?o sejam violados. Pretendeu-se programar o m?todo diretamente num CLP para que funcione em conjunto com o seu controlador. Inicialmente, resultados de simula??es num?ricas s?o apresentados para ilustrar o funcionamento do m?todo. Em seguida, ? descrita a implementa??o do m?todo por meio da programa??o de CLP. Resultados de experimentos em plantas reais controladas por CLP ilustram a efetividade do m?todo. / Automatic process control is a growing demand in industries that seek techniques that automate the tuning of control systems and ensure efficiency, quality and safety. This work aims to implement a method of assessment and readjustment of PI controllers in Programmable Logic Controller (PLC), in order to improve the robustness of the system. The method is inspired by works from the literature and has two stages, the first step is to evaluate the robustness of the controller, in which its gain and phase margins are estimated. In the second step the parameters of the PI controller are adjusted to ensure that the robustness criteria are not violated. It was intended to program the method directly into a PLC to work together with its controller. Initially, results of numerical simulations are presented to illustrate the method?s operation. Then, the implementation of the method through PLC programming is described. Experiments results in real plants controlled by PLC illustrate the effectiveness of the method.

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