Robust Control Design using Discrete Sliding Mode Control for Higher-Order Uncertain Systems
Y. P. Patil1, H. G. Patel2

1Y. P. Patil*, Department of Instrumentation and Control, MVPS’s KBT College of Engineering, Nashik, Affiliated to SPPU, Pune, India.
2H. G. Patel, Department of Electrical Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, India.
Manuscript received on January 26, 2020. | Revised Manuscript received on February 05, 2020. | Manuscript published on February 30, 2020. | PP: 3055-3063 | Volume-9 Issue-3, February 2020. | Retrieval Number:  C6037029320/2020©BEIESP | DOI: 10.35940/ijeat.C6037.029320
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Abstract: 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.
Keywords: Discrete-time sliding-mode control, higher order delay time process, observer, model following control.