Effect of Time Delay on Robust PID Controllers for a Transfer Function
Mukul Gaur1, Sachin Goyal2, Sulata Bhandari3
1Mukul Gaur, Department of Electrical Engineering, PEC University, Chandigarh, India.
2Sachin Goyal, Department of Electrical Engineering, PEC University, Chandigarh, India.
3Prof. Sulata Bhandari, Department of Electrical Engineering, PEC University, Chandigarh, India.
Manuscript received on 21 May 2013 | Revised Manuscript received on 28 May 2013 | Manuscript published on 30 May 2013 | PP: 133-137 | Volume-2 Issue-2, May 2013 | Retrieval Number: B0628052213/2013©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: A controller designed for a nominal process model generally works fine for the nominal plant model, but may fail even by a slight change in it. Robust control deals with system analysis and control design for such imperfectly known process models. Robust control has been a recent addition to the field of control engineering that primarily deals with obtaining system robustness in the presence of uncertainties. A lot of research has been done and many approaches are available for robust design of the plants. In this paper, a graphical technique introduced in  to find all proportional integral derivative (PID) controllers that satisfy the robust stability constraint of a given single input-single-output (SISO) linear time-invariant (LTI) system with time delay, is followed and effects of change of time-delay in the nominal plant model is discussed.
Keywords: H∞ Control, Robust Stability, Small Gain Theorem, Time-Delay
Scope of the Article: Microcontrollers for IoT