Title :
To Zero or to Hold Control Inputs With Lossy Links?
Author_Institution :
Fac. of Inf. Eng., Univ. of Padova, Padova
fDate :
5/1/2009 12:00:00 AM
Abstract :
This technical note studies the linear quadratic (LQ) performance of networked control systems where control packets are subject to loss. In particular we explore the two simplest compensation strategies commonly found in the literature: the zero-input strategy, in which the input to the plant is set to zero if a packet is dropped, and the hold-input strategy, in which the previous control input is used if packet is lost. We derive expressions for computing the optimal static gain for both strategies and we compare their performance on some numerical examples. Interestingly, none of the two can be claimed superior to the other, even for simple scalar systems, since there are scenarios where one strategy performs better then the other and scenarios where the converse occurs.
Keywords :
distributed control; linear quadratic control; poles and zeros; stability; hold-input strategy; linear quadratic performance; lossy links; networked control systems; optimal static gain; zero-input strategy; Buffer storage; Communication system control; Control systems; Filters; Intelligent actuators; Networked control systems; Optimal control; Performance gain; Performance loss; Stability; LQ control; networked systems; packet loss; stability;
Journal_Title :
Automatic Control, IEEE Transactions on
DOI :
10.1109/TAC.2008.2010999