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RippleFree DualRate Control with TwoDegreeofFreedom Integrator
Takao SATO Akira YANOU Shiro MASUDA
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E101A
No.2
pp.460466 Publication Date: 2018/02/01 Online ISSN: 17451337
DOI: 10.1587/transfun.E101.A.460 Type of Manuscript: PAPER Category: Systems and Control Keyword: dualrate system, discrete time, continuous time, intersample, twodegreeoffreedom, state space,
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Summary:
A ripplefree dualrate control system is designed for a singleinput singleoutput dualrate system, in which the sampling interval of a plant output is longer than the holding interval of a control input. The dualrate system is converged to a multiinput singleoutput singlerate system using the lifting technique, and a control system is designed based on an error system using the steadystate variable. Because the proposed control law is designed so that the control input is constant in the steady state, the intersample output as well as the sampled output converges to the setpoint without both steadystate error and intersample ripples when there is neither modeling nor disturbance. Furthermore, in the proposed method, a twodegreeoffreedom integral compensation is designed, and hence, the transient response is not deteriorated by the integral action because the integral action is canceled when there is neither modeling nor disturbance. Moreover, in the presence of the modeling error or disturbance, the integral compensation is revealed, and hence, the steadystate error is eliminated on both the intersample and sampled response.


