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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

Controle preditivo bilinear aplicado a um motor de indu??o / Bilinear Predictive Controllers applied in an induction motor drive

Barros Filho, Adjair Ferreira 13 December 2002 (has links)
Made available in DSpace on 2014-12-17T14:55:34Z (GMT). No. of bitstreams: 1 AdjairFBF.pdf: 1621773 bytes, checksum: a2e7e0048de8c81be0d8971f8c7dd9bf (MD5) Previous issue date: 2002-12-13 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The present work is based on the applied bilinear predictive control applied to an induction motor. As in particular case of the technique based on predictive control in nonlinem systems, these have desperted great interest, a time that present the advantage of being simpler than the non linear in general and most representative one than the linear one. One of the methods, adopted here, uses the linear model "quasi linear for step of time" based in Generalized Predictive Control. The modeling of the induction motor is made by the Vectorial control with orientation given for the indirect rotor. The system is formed by an induction motor of 3 cv with rotor in squirregate, set in motion for a group of benches of tests developed for this work, presented resulted for a variation of +5% in the value of set-point and for a variation of +10% and -10% in the value of the applied nominal load to the motor. The results prove a good efficiency of the predictive bilinear controllers, then compared with the linear cases / O presente trabalho baseia-se na aplica??o da t?cnica de controle preditivo bilinear em um motor de indu??o. O controle preditivo bilinear, caso particular do controle preditivo n?o linear, t?m despertado grande interesse, uma vez que apresenta a vantagem de ser mais simples que o n?o linear em geral e mais representativo que o linear. Um dos m?todos, aqui adotado, utiliza o modelo "quase linear por degrau de tempo" baseado no Controlador Preditivo Generalizado. A modelagem do motor de indu??o ? feita atrav?s do controle Vetorial com orienta??o dada pelo campo do rotor indireto. O sistema ? formado por um motor de indu??o de 3 HP como rotor em gaiola de esquilo, acionado por uma bancada de testes desenvolvida para esse trabalho. Foram obtidos resultados para uma vaira??o de +5% no valor do set-point e resultados para uma varia??o de +10% e -10% no valor da carga nominal aplicada ao motor. Os resultados comprovam uma boa efici?ncia dos controladores preditivos bilineares, quando comparados com os casos lineares
2

Estudo e implementa??o de um controlador preditivo generalizado bilinear compensado adaptativo

Cavalcanti, Anderson Luiz de Oliveira 12 December 2003 (has links)
Made available in DSpace on 2014-12-17T14:56:04Z (GMT). No. of bitstreams: 1 AndersonLOC.pdf: 406689 bytes, checksum: 691bbb5946a5ec4cddcd17c2240e9a91 (MD5) Previous issue date: 2003-12-12 / The present work presents the study and implementation of an adaptive bilinear compensated generalized predictive controller. This work uses conventional techniques of predictive control and includes techniques of adaptive control for better results. In order to solve control problems frequently found in the chemical industry, bilinear models are considered to represent the dynamics of the studied systems. Bilinear models are simpler than general nonlinear model, however it can to represent the intrinsic not-linearities of industrial processes. The linearization of the model, by the approach to time step quasilinear , is used to allow the application of the equations of the generalized predictive controller (GPC). Such linearization, however, generates an error of prediction, which is minimized through a compensation term. The term in study is implemented in an adaptive form, due to the nonlinear relationship between the input signal and the prediction error.Simulation results show the efficiency of adaptive predictive bilinear controller in comparison with the conventional. / O presente trabalho tem como objetivo o estudo e a implementa??o de um controlador preditivo generalizado bilinear adaptativamente compensado. Este trabalho utiliza t?cnicas de controle preditivo convencionais juntamente com t?cnicas de controle adaptativo na busca de um melhor resultado. No intuito de solucionar problemas de controle freq?entemente enfrentados pela ind?stria qu?mica, ? proposto o modelo bilinear para representar a din?mica dos sistemas em estudo. Os modelos bilineares s?o uma classe particular dentre os modelos n?o-lineares, por?m s?o por natureza mais simples que os modelos n?o lineares gerais e ainda conseguem representar as n?o-linearidades intr?nsecas dos processos industriais. A lineariza??o do modelo, pela aproxima??o quasilinear por degrau de tempo, ? utilizada para viabilizar a aplica??o das equa??es do controlador preditivo generalizado (GPC). Tal lineariza??o, no entanto, gera um erro de predi??o, o qual ? minimizado atrav?s de um termo de compensa??o. O termo em estudo ? implementado de forma adaptativa, dada a forte rela??o n?o-linear entre o sinal de entrada e o erro de predi??o. Resultados de simula??o mostram a efici?ncia do controlador preditivo bilinear adaptativo em compara??o com o convencional.

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