TITLE:
A Novel Technique for Detection of Time Delay Switch Attack on Load Frequency Control
AUTHORS:
Arman Sargolzaei, Kang K. Yen, Mohamed N. Abdelghani, Abolfazl Mehbodniya, Saman Sargolzaei
KEYWORDS:
Time Delay Switch Attack, Load Frequency Control, Detection and Estimation, Emergency Controller
JOURNAL NAME:
Intelligent Control and Automation,
Vol.6 No.4,
October
30,
2015
ABSTRACT: In this paper, we focus
on the estimation of time delays caused by adversaries in the sensing loop (SL).
Based on the literature review, time delay switch (TDS) attacks could make any
control system, in particular a power control system, unstable. Therefore,
future smart grids will have to use advanced methods to provide better
situational awareness of power grid states keeping smart grids reliable and
safe from TDS attacks. Here, we introduce a simple method for preventing time
delay switch attack on networked control systems. The method relies on an
estimator that will estimate and track time delays introduced by an adversary.
Knowing the maximum tolerable time delay of the plant’s optimal controller for
which the plant remains stable, a time-delay detector issues an alarm signal
when the estimated time delay is larger than the minimum one and directs the
system to alarm state. In an alarm state, the plant operates under the control
of an emergency controller that is local to the plant and remains in this mode
until the networked control system state is restored. This method is an
inexpensive and simple way to guarantee that an industrial control system
remains stable and secure.