Design Supplementary Controller Based on Stabilizing Effect of Delay for Damping Inter Area Oscillations in a Power System

The delay associated with signal transmission through the wide-area measurement system reduces the functionality of the power oscillation damping control system. One of the important issues is the poor operation of the supplementary controller against delay existence, which limits the efficiency of damping of ancillary equipment, such as SVCs in a power system. This paper as a solution proposes a controller designed based on the stabilizing effect of delay. This controller applies to the SVC input the controlling signal with some delay. To determine the delay and controller parameters, an algorithm is proposed minimizing the rightmost real part of eigenvalues in the design stage. The stability analysis of the control system is performed with the eigenvalue tool. A four-machine power system is used to perform various simulations to assess the accuracy of the proposed control function and the feasibility of the proposed method. The simulation results show that the controller designed in a wide range of the measurement system delays, does not limit damping performance of SVC.