Fractional order integrator for the relay feedback identification of a process Nyquist point in the third quadrant |
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Authors: | Jeonguk Byeon Jin-Su Kim Su Whan Sung Jietae Lee |
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Affiliation: | 1.Department of Chemical Engineering,Kyungpook National University,Daegu,Korea |
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Abstract: | A fractional order integrator can be used for the relay feedback identification of a process Nyquist point in the third quadrant,
and to implement the fractional order integrator, it is often approximated by integer order systems. Here, instead of the
usual rational transfer function approximation of the fractional order integrator in the relay feedback system, a simple analytic
method which utilizes the on-off characteristics of relay output is proposed. Simulation results show that the proposed method
can find process Nyquist points in the third quadrant without worrying about the approximation errors and ranges of the fraction
order integrator. |
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Keywords: | |
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