Digital redesign of weighted switching and output-reference tracking with state saturation for cascaded analog systems

• Main Authors: Meng-Che Wu, 吳孟哲
• Other Authors: Jason Sheng-Hong Tsai
• Format: Others
• Language: en_US
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/04893530800711920495

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 90 === This thesis addresses two tracker design methodologies for cascaded analog systems with the state-saturation constraint. One is the weighted switching lifted digitally redesigned tracker, the other is the output-reference tracking digitally redesigned tracker. The former is aimed to the lifted performance of the weighted switching, and the latter is aimed to remove the influence of external loads. For various reasons, the energy delivered from plant to plant in cascaded system is bounded. This can be described by a bound on the internal state amplitude of the cascaded system. If this limitation is omitted in the control design, unexpected phenomena can affect the closed-looped system, and the closed-loop system can become unstable in the worst case. The effect of this constraint can be abated by using the weighted switching strategy that it makes system out of saturation region as soon as possible. The lifted technique and the output-reference tracking scheme are used to increase the performance of the digital redesigned controller and to remove the influence of external loads, respectively. The main realizations of controllers are based on above-mentioned methodologies and to associate with the digital implementation of microprocessors and digital signal processing chips.