Tesis doctoral de Josep M. Olm Miras
Nowadays, dc-to-ac conversion has an important practical application in the field of uninterruptible power systems (ups). Basic dc-to-dc switch mode power converters (the buck, which is linear, and the boost and buck-boost, which are nonlinears) possess a very simple structure, and during the last fifteen years the possibility of using them in dc-to-ac conversion schemes has been studied. the aim of this thesis is to achieve that the output voltage of the dc-to-dc buck, boost and buck-boost power converters can track periodic references. robust schemes to eliminate disturbance effects in the tracking task are also developed. Sliding modes are used as the control technique, and the obtained results are validated by numeric simulation. the thesis is organized in chapters. The first and the second one contain an introduction and a review of the existing literature. The contents and contributions of the other chapters follow below. chapter 3 deals with the exact and asymptotic tracking of a time varying reference by the load voltage of a step-down converter, indirectly controlled through the input current. Departing from the study of the tracking problem in linear systems with fixed gains with the aid of module theory, conditions over possible reference signals have been obtained. Moreover, a sliding mode strategy to achieve the control target, consisting in a procedure to modify a switching surface initially good for regulation tasks and a control law, is provided. An approppriate choice of state variables allows possible load perturbations to satisfy the matching condition. in chapter 4, an inversion-based indirect control is used to reach exact tracking of periodic references with the load resistance of nonminimum phase, nonlinear boost and buck-boost converters. Sufficient conditions for candidate references are also obtained. A general frame for an inversion-based treatment of the perfect tracking problem in a certain class of n
Datos académicos de la tesis doctoral «Asymptotic tracking with dc-to-dc bilinear power converters«
- Título de la tesis: Asymptotic tracking with dc-to-dc bilinear power converters
- Autor: Josep M. Olm Miras
- Universidad: Politécnica de catalunya
- Fecha de lectura de la tesis: 16/04/2004
Dirección y tribunal
- Director de la tesis
- E. Fossas Colet
- Tribunal
- Presidente del tribunal: ferran Puerta sales
- chris Edwards (vocal)
- joan Solí -morales rubio (vocal)
- Francisco Gordillo álvares (vocal)