Pesudo-sliding controller design for discrete-time system

• Main Authors: Wen-Bin Huang, 黃文彬
• Other Authors: Chieh-Li Cheng
• Format: Others
• Language: en_US
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/30516234764204647769

碩士 === 國立成功大學 === 航空太空工程學系 === 81 === In control system design, it is often required that the system behavior is insensitive to the parameter variations and external disturbances. To this problem, variable structure system control (VSSC) theory has been developed to deal with this predicament. The theory of variable structure for continuous system has been successfully developed and applied to various control system. It is well known that it possesses the characteristics of fast response and insensitivities to changes in the system parameters or external disturbances when in the sliding mode. However, the corresponding theory of variable structure for discrete system has not yet been developed completed. It should be noted that all of the works accomplished to date has concentrated upon modifying the control configuration to ensure the sliding motion for the nominal system. However, if there exist uncertainties in the system, the design procedure used in nominal system dose not guarantee stability. Hence, the emphasis of recent researches then focus on ensuring the occurrence of the sliding motion for the uncertain system. However, the work has not yet been successful. In his dissertation, the pseudo-sliding control law is obtained which guarantees the occurrence and the stability of the pseudo- sliding motion using only a state feedback gain. The performance and the robustness of the proposed control system has also been discussed. Since the derived control law is simply a constant feedback gain, it is obvious that the phenomenon of chattering can be reduced, and the system can be analyzed and designed more systematically.