Reset control performance improvement using fractional derivatives
Duarte Valerio (Universidade de Lisboa)
Niranjan Saikumar (Nearfield Instruments B.V.)
Ali Ahmadi Dastjerdi (Nearfield Instruments B.V.)
Nima Karbasizadeh (ASML)
S. Hassan Hassan HosseinNia (TU Delft - Mechatronic Systems Design)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
When a linear controller is replaced by a reset controller, it is possible to keep the gain behaviour essentially the same, while improving the phase behaviour. However, because reset control is nonlinear, higher order harmonics appear, which may deteriorate the results. In this paper, reset controllers are combined with fractional derivatives, decreasing the magnitude of higher order harmonics. In this way, better results are found in simulations of a Clegg integrator, of a FORE (first order reset element), and of a CgLp (constant in gain lead in phase) controller. The reason why better results are found is explained.
help_outline