The realization of fractional-order controllers is based on the approximation of the irrational operators by continuous or discrete transfer functions. However, at high sampling frequencies, discrete z-transfer functions approximations can be very sensitive even to small changes in coefficient values. This technical note proposes a realization of s^nu, in terms of transfer functions in the complex delta-domain, which improves considerably the robustness of the approximation to parameter changes and then to truncation in transfer function coefficients applied for implementation with finite word length.
|Titolo:||High-Speed Digital Realizations of Fractional Operators in the Delta Domain|
|Data di pubblicazione:||2011|
|Digital Object Identifier (DOI):||10.1109/TAC.2010.2101134|
|Appare nelle tipologie:||1.1 Articolo in rivista|