15th Triennial World Congress of the International Federation of Automatic Control
  Barcelona, 21–26 July 2002 
H LOOPSHAPING USING GRAPHICAL LOOPSHAPING IDEAS
Fernando Tadeo*, Francisco del Valle*, Omar Pérez, William Colmenares**
* Departamento de Ingeniería de Sistemas y Automática
Facultad de Ciencias, Universidad de Valladolid, 47011 Valladolid, Spain
fernando@autom.uva.es
** Universidad Simón Bolívar, Centro de Automatización Industrial
Apartado 89000, Caracas 1080, Venezuela

This paper studies the design of robust controllers using a robust loopshaping approach, by selection of the weighted plant using graphical loopshaping ideas. The H_infinity Loop Shaping method is applied to calculate an optimal controller. The problem of choosing the desired shape of the open-loop transfer function needed by this method is addressed by considering the available uncertainty information and applying Graphical Loopshaping ideas. Thus, this methodology considers not only the robustness properties of the shaped plant, but also those of the real plant. Several examples show the advantages of using this approach.
Keywords: Robust Control, Hinfinity Control, Distillation columns
Session slot T-Mo-M21: Posters of Industrial Applications/Area code 7a : Chemical Process Control