TITLE:
Design of Robust Controller for LFC of Interconnected Power System Considering Communication Delays
AUTHORS:
T. Jesintha Mary, P. Rangarajan
KEYWORDS:
Continuous Pole Placement Technique, Delay Margin, Delay-Dependent Stability Analysis, Frequency Sweeping Test, Load Frequency Control with Time Delays, Output Feedback Control
JOURNAL NAME:
Circuits and Systems,
Vol.7 No.6,
May
13,
2016
ABSTRACT: The usage of open communication infrastructure for transmitting
the control signals in the Load Frequency Control (LFC) scheme of power system
introduces time delays. These time delays may degrade the dynamic performance
of the power system. This paper proposes a robust method to design a controller
for multi-area LFC schemes considering communication delays. In existing
literature, the controller values of LFC are designed using time domain
approach which is less accurate than the proposed method. In proposed method, the controller values are determined by moving the rightmosteigenvalues of the system to the left half plane in a quasi-continuous way for a preset upper bound of time delay. Then the robustness of the proposed controller is
assessed by estimating the maximumtolerable value of time delay for maintaining system
stability. Simulation studies are carried out for multi-area LFC scheme equipped with the proposed controller using
Matlab/simulink. From the results, it has been concluded that the proposed
controller guarantees the tolerance for all time delays smaller than the preset
upper bound and provides a bigger delay margin than the existing controllers.