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On the role of information in large-scale control systems

Information processing and feedback control plays an increasingly important role in some of today's largest engineering challenges, such as in intelligent transportation, industrial automation, and smart energy systems. As the scale and complexity of these highly integrated and heterogeneous systems grow, it is important to understand the fundamental principles for how control and communication systems should be designed and implemented. In this talk, we will discuss some recent results on distributed control in large-scale systems based on partial plant state and model information. In the design of local control laws, it is often reasonably to assume that only limited model information of the plant dynamics is available. Hence, we will first discuss a family of limited model information control design methods, which give controllers by accessing the plant's model in a constrained way according to a given design graph. We investigate the achievable closed-loop performance of linear plants under a quadratic cost performance and give some fundamental bounds. Secondly, we will emphasize how real-time state information is being communicated over large wired and wireless networks influence the overall system performance. Criteria for how to adapt communication resources to closed-loop applications will be discussed. We will motivate and illustrate the results through ongoing projects with Swedish industry. The presentation will be based on joint work with collaborators at KTH and elsewhere.

Type of Seminar:
Lecture Series on Directions in Systems and Control
Prof. Karl Johansson
School of Electrical Engineering, Royal Institute of Technology, Stockholm
Nov 24, 2011   16:15

HG E 33.1, Rämistrasse 101
Contact Person:

John Lygeros
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Biographical Sketch:
Karl H. Johansson is Director of the ACCESS Linnaeus Centre and Professor at the School of Electrical Engineering, Royal Institute of Technology, Sweden. He is a Wallenberg Scholar since 2010 and has held a Senior Researcher Position with the Swedish Research Council. He received MSc and PhD degrees in Electrical Engineering in 1992 and 1997 from Lund University. He has held visiting positions at UC Berkeley (1998-2000) and California Institute of Technology (2006-07). His research interests are in networked control systems, hybrid and embedded control, and control applications in automotive, automation, and energy systems. He was the Chair of the IFAC Technical Committee on Networked Systems 2008-2011 and the General Chair for Cyber-Physical Systems Week 2010. He has served on the Executive Committees of several European research projects in the area of networked embedded systems. He is on the editorial board of IET Control Theory & Applications, and previously of IEEE Transactions on Automatic Control and the IFAC journal Automatica. He was awarded an Individual Grant for the Advancement of Research Leaders from the Swedish Foundation for Strategic Research in 2005. He received the triennial Young Author Prize from IFAC in 1996 and the Peccei Award from the International Institute of System Analysis, Austria, in 1993. He received Young Researcher Awards from Scania in 1996 and from Ericsson in 1998 and 1999.