Estratégia de controle moderno e discreto aplicado a um protótipo de fonte modular de corrente do Sirius

Abstract

The need for a high precision current to feed the magnetic load in particle accele-rators brings as object of study different control strategies. This dissertation presents the analysis and synthesis of a modern and discrete time control technique based on state feedback applied to a power supply magnetic prototype of Sirius. Series and / or parallel associations of modules of lower power form the source in a way that, together, they reach voltage and current requirements of the magnets. The module consists of two stages of static converters, one of input and one of output, which the control of the second is object of study of this work. The topology consists of a full bridge con-verter associated with a third order filter. The mathematical model of the prototype is described and verified by a consistent set of computational simulations. This plant’s discretization enabled the use of the Digital Quadratic Linear Regulator to allocate the closed loop poles in the design process of digital control of the sources. Due to the specific limitations related to the Digital Signal Controller of the prototype, a reduced order observer was used to reduce the number of monitored signals. Modern and di-gital control strategy was tested in the prototype provided by LNLS. It was possible to verify that the number of mathematical operations increases significantly with the association of modules and can compromise the execution in real time of the control routines. Therefore, subsampling technique made it possible to control the serial asso-ciation of two modules. Experimental results confirm the simulation results and allow to evaluate the benefits and limitations of the application of modern and digital control in the current source.