Modeling, Analysis and Adaptive Fuzzy Control Design for a Class of Switching Power Converters
| Autor: | Guan-Jhih Liou, 劉冠志 |
|---|---|
| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 Linear power converters are gradually replaced by switching power converters because of the advantages such as being compact, lightweight, high-efficiency and larger input voltage range. A category of switching power converters of complex topology, e.g., the phase-shifted pulse-width modulated (PSPWM) full bridge soft switched power converter, has become a widely used circuit topology due to various beneficial characteristics. The input and output voltages for switching power are often subject to fluctuations due to unstable power sources and varying load current, respectively. Most applications require constant (or even variable) output voltage or current of wide-ranging adjustability. Therefore, feedback control has been incorporated into those converters to not only stabilize, but also improve the performance robustness of the output. This thesis focus on a class of switching power converters (PSPWM full bridge power converter). Build up the mathematical model, analysis and control system design from the perspective of control field. A comprehensive model combining the respective state variable models of the interval subsystems is established. It is different from small signal model. We use Kirchhoff''s voltage law (KVL) and Kirchhoff''s current law (KCL) to build up the complete state space model so that it can be simulated by Simulink. Comparison with PSpice simulation justifies the credibility of the model. Based on this model, internal/ bounded-input bounded-output (BIBO) stability can be studied for each interval subsystem. Moreover, controllability and observability can also be analyzed to help determining subsequent control configuration. We design two kinds of adaptive fuzzy control. One is the system is unknown and there is no disturbance. The fuzzy logic system are used to model the plant. Another is the system is unknown and there is disturbance. We incorporate sliding mode to resist the disturbance. Finally, we apply the study to fuel cells and analyze the results. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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