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Reset control approximates complex order transfer functions
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DOI：10.1007/s11071-019-05130-2.png)
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摘要
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A controller with the frequency response of a complex order derivative may have a gain that decreases with frequency, while the phase increases. This behaviour may be desirable to ensure simultaneous rejection of high-frequency noise and robustness to variations of the open-loop gain. Implementations of such complex order controllers found in the literature are unsatisfactory for several reasons: the desired behaviour of the gain may be difficult or impossible to obtain, or non-minimum phase zeros may appear, or even unstable open-loop poles. We propose an alternative nonlinear approximation, combining a CRONE approximation of a fractional derivative with reset control, which does not suffer from these problems. An experimental proof of concept confirms the good results of this approximation and shows that nonlinear effects do not preclude the desired performance.
Keyword:
Reset control
Fractional calculus
Complex order derivatives
Micro precision
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期刊
IF:
6
论文数:
1.4W
被引数:
4.1W
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Energies
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