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http://dx.doi.org/10.5302/J.ICROS.2007.13.10.990

A New Sliding Mode Control for Set-point Regulation of Second Order LTI Nonminimum Phase Systems  

Lee, Ha-Joon (한국과학기술원 전자전산학부 전기 및 전자공학)
Park, Cheol-Hoon (한국과학기술원 전자전산학부 전기 및 전자공학)
Publication Information
Journal of Institute of Control, Robotics and Systems / v.13, no.10, 2007 , pp. 990-999 More about this Journal
Abstract
We deal with second order NMP(Non-Minimum Phase) systems which are difficult to control with conventional methods because of their inherent characteristics of undershoot. In such systems, reducing the undesirable undershoot phenomenon makes the response time of the systems much longer. Moreover, it is impossible to control the magnitude of undershoot in a direct way and to predict the response time. In this paper, we propose a novel two sliding mode control scheme which is capable of determining the magnitude of undershoot and thus the response time of NMP systems a priori. To do this, we introduce two sliding lines which are in charge of control in turn. One is used to stabilize the system and achieve asymptotic regulation eventually like the conventional sliding mode methods and the other to stably control the magnitude of undershoot from the beginning of control until the state meets the first sliding line. This control scheme will be proved to have an asymptotic regulation property. The computer simulation shows that the proposed control scheme is very effective and suitable for controlling the second order NMP system because it can decide the magnitude of undershoot in a direct and stable way and reduce the response time compared with the conventional ones.
Keywords
nonminimum phase systems; sliding mode control; undershoot;
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