Open AccessRobust Control Design using Discrete Sliding Mode Control for Higher Order Uncertain Systems
Author(s) -
Y. P. Patil,
Hiren G. Patel
Publication year - 2020
Publication title -
international journal of engineering and advanced technology
Language(s) - English
Resource type - Journals
ISSN - 2249-8958
DOI - 10.35940/ijeat.c6037.029320
Subject(s) - control theory (sociology) , settling time , robustness (evolution) , sliding mode control , discrete time and continuous time , computer science , pid controller , overshoot (microwave communication) , robust control , controller (irrigation) , mode (computer interface) , control engineering , control system , mathematics , engineering , control (management) , nonlinear system , step response , temperature control , artificial intelligence , physics , chemistry , biology , telecommunications , biochemistry , quantum mechanics , agronomy , statistics , electrical engineering , gene , operating system
This paper considers a tracking problem on discrete-time higher-order linear time-delay systems. The improved observer-model following sliding mode controller (OMF-SMC) is proposed. The combination uses a classical Luyenberger observer based controller to achieve predefined process output and sliding mode controller is added to assure the robustness despite of uncertainty and external disturbances. To show the effectiveness of proposed method, four error performance indices, maximum peak overshoot and settling time are considered rigorously. The simulations results on the non-oscillatory, moderate oscillatory, integrating, unstable and non-minimum phase system demonstrates that the proposed approach performs better compared with classical PID controller, continuous and discrete sliding mode controllers.