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Abstract
This paper deals with the stability analysis of network-controlled load frequency control system (LFC) in the presence of time-delays. Network-based control system requires transmitting measured data from the plant site to the controller and control signals from the controller to the plant site. Use of an open communication channel for transmitting data involves a delay in the control loop. Such a delay would affect the LFC system stability. Lyapunov-Krasovskii functional (LKF) analysis and linear matrix inequalities (LMIs) techniques are used to investigate the stability of LFC system with proportional-integral (PI) controller. A less conservative delay-dependent stability criterion is derived using a discrete delay N-decomposition approach to determine the delay margin for the LFC system. This investigation is done to find a relationship between the delay margin of the LFC system and gain of the PI controller. The effectiveness of the obtained results is verified using simulation studies.
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