DocumentCode :
592309
Title :
A tractable nonlinear fault detection and isolation technique with application to the cyber-physical security of power systems
Author :
Mohajerin Esfahani, Peyman ; Vrakopoulou, Maria ; Andersson, Goran ; Lygeros, John
Author_Institution :
Dept. of Electr. Eng., Swiss Fed. Inst. of Technol. (ETH), Zürich, Switzerland
fYear :
2012
fDate :
10-13 Dec. 2012
Firstpage :
3433
Lastpage :
3438
Abstract :
This article consists of two parts: a theoretical part concerned with fault detection schemes, and an application part dealing with cyber security of power systems. In the first part, we develop a tractable approach to design a robust residual generator to detect and isolate faults in high dimensional nonlinear systems. Previous approaches on fault detection and isolation problems are either confined to linear systems or they are only applicable to low dimensional dynamics with more specific structures. In contrast, we propose a novel methodology to robustify a linear residual generator for a nonlinear system in the presence of certain disturbance signatures. To this end, we formulate the problem into the framework of quadratic programming which enables us to solve relatively high dimensional systems. In the second part, the application is motivated by the emerging problem of cyber security in power networks. We provide description of a multi-machine power system that represents a two-area power system, and we model a cyber-physical attack emanating from the vulnerabilities introduced by the interaction between IT infrastructure and power system. The algorithm developed in the first part is finally used to diagnose such an intrusion before the functionality of the power system is disrupted.
Keywords :
electric generators; fault diagnosis; nonlinear systems; power system security; quadratic programming; IT infrastructure; cyber-physical attack; cyber-physical security; high dimensional nonlinear systems; linear residual generator; multimachine power system; power systems; quadratic programming; robust residual generator design; tractable nonlinear fault detection and isolation technique; two-area power system; Automatic generation control; Generators; Load modeling; Mathematical model; Polynomials; Power systems;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Decision and Control (CDC), 2012 IEEE 51st Annual Conference on
Conference_Location :
Maui, HI
ISSN :
0743-1546
Print_ISBN :
978-1-4673-2065-8
Electronic_ISBN :
0743-1546
Type :
conf
DOI :
10.1109/CDC.2012.6426269
Filename :
6426269
Link To Document :
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