Simulation and Analysis of System Oscillation and Characteristic of Starting Relay Based on Fault Component During System Oscillation

A parameters controllable oscillation model is constituted with ATP based on analysis of the changing pattern of oscillation current and voltage. The model covers deficiency of power system simulation tools that have no models to be used for analysis of oscillation. Protection relays which would be influenced by oscillation are classed. As a major test, detailed theoretic analysis as well as simulation of operation characteristic of starting relay based on fault component characteristic during system oscillation is carried out. The important meaning of the floating threshold used in starting relay is emphasized. The conclusion could be used as technical reference.