Abstract
In this study, linear quadratic Gaussian (LQG) control is used for designing a wide area damping controller (WADC) in power system. The designed continuous and discrete mode LQG-based WADC is robust enough to deal with the problem of imperfect communication medium. The imperfect communication medium includes process noise, measurement noise, packet drop-out and signal latency in the remote control signal. The appropriate control input and the controller location are selected using the modal residue method. The imperfections in the communication network are modelled using Pade approximations for time delay and by inserting Gaussian random noise. Using two typical test power systems, the performance of robust LQG-based WADC as a power system stability agent is assessed in the frequency domain and via time-domain simulation of the non-linear model on MATLAB/Simulink and DIgSILENT software platform. Finally, a real-time implementation of the designed WADC is demonstrated on the Opal RT-Lab real-time digital simulator.
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