Author:
Kamiya Tomonori, ,Sato Takao,Araki Nozomu,Konishi Yasuo
Abstract
[abstFig src='/00280005/12.jpg' width='300' text='Comparison of output responses' ] This paper discusses a design method for a multirate system including integrators, where the update interval of the control input is shorter than the sampling interval of the plant output. In such a multirate control system, intersample output might oscillate between sampled outputs in the steady state even if the sampled output converges to the reference input. This is because the control input can be updated between the sampled outputs. In a conventional method, a predesigned control law is extended such that the steady-state ripples are eliminated independent of a discrete-time response. However, the conventional method is invalid when integrators are included in a controlled plant. In this study, a difference operation in discrete time is used to address this issue. Moreover, the transient-state intersample response is improved independent of a pre-designed discrete-time response.
Publisher
Fuji Technology Press Ltd.
Subject
Electrical and Electronic Engineering,General Computer Science
Reference11 articles.
1. M. Araki and T. Hagiwara, “Pole Assignment by Multirate Sampled-data Output Feedback,” Int. J. Control, Vol.44, No.6, pp. 1661-1673, 1986.
2. T. Chen and B. Francis, “Optimal Sampled-Data Control Systems,” Springer-Verlag, London, 1995.
3. A. Tangirala, D. Li, R. Patwardhan, S. Shah, and T. Chen, “Issues in Multirate Process Control,” Proc. of American Control Conf., pp. 2771-2775, 1999.
4. A. Inoue and M. Deng, “An optimal robust controller with multi-rate output feedback by using symbolic computation,” Proc. of the 2014 Int. Conf. on Advanced Mechatronic Systems, pp. 224-228, Luoyang, China, 2013.
5. H. Werner, “Generalized sampled-data hold functions for robust multivariable tracking and disturbance rejection,” Optimal Control Applications and Methods, Vol.22, pp. 75-93, 2001.