Use of Lissajous Figures for Detection of Power Swing and Faults

Abstract

Proper and reliable operation of distance relays is of prime importance considering the continuity of power flow and system stability. Hence, various power swing blocking (PSB) and de-blocking algorithms have been proposed over the past for power system protection. Algorithm based on V-I Lissajous figure is comparatively very new approach which has found its application in distance protection. However, such algorithm for distance protection is only tested for uncompensated system and that too only for detecting faults and symmetrical power swing.  This paper aims to find the reliability of such algorithm involving Lissajous figures; for detection of asymmetrical power swing and also for series compensated transmission line based on V-I Lissajous figures. Analysis shows that the earlier proposed algorithm is applicable to both the systems; with and without series compensation, but algorithm cannot detect asymmetrical power swing as Lissajous figures for asymmetrical power swing and fault is similar. The results are obtained by simulating the modified IEEE 3-machine 9-bus system on MATLAB with and without compensation.