Integrated estimator and L1 adaptive controller for well drilling systems

Zhiyuan Li, Naira Hovakimyan, Chengyu Cao, Glenn Ole Kaasa

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper presents an integrated adaptive estimator-controller scheme for a class of systems with only partially measured states. To estimate the non-measured states, a fast adaptive estimator is applied. The estimation is used in the L1 adaptive controller, which adapts to time-varying unknown parameters and time-varying bounded disturbances in the system without restricting their rate of variation. The results demonstrate that the L1 adaptive controller has guaranteed performance bounds for system's both input and output, while using the estimation of the regulated outputs. The approach is used to control the bottom hole pressure of a well drilling system, in which the measurement of the pressure is updated at a low rate. Simulations verify the theoretical findings.

Original languageEnglish (US)
Title of host publication2009 American Control Conference, ACC 2009
Number of pages6
StatePublished - 2009
Event2009 American Control Conference, ACC 2009 - St. Louis, MO, United States
Duration: Jun 10 2009Jun 12 2009

Publication series

NameProceedings of the American Control Conference
ISSN (Print)0743-1619


Other2009 American Control Conference, ACC 2009
Country/TerritoryUnited States
CitySt. Louis, MO

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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