Impacts of HVAC interconnection parameters on inter-area ocsillation

This paper investigates the impacts of distance and power flow of transmission line interconnections on the inter-area oscillations. The effectiveness of Power System Stabiliser (PSS) in damping the inter-area oscillations is studied considering various combinations of interconnection power flows and distances. Simulations are carried out on a two area 4 generator test system as well as on the simplified South East Australian power system. Time domain simulations are also used to explain the behaviour of the system subjected to a small disturbance. Simulation results show that the inter-area mode is less stable when the length of the interconnection increases. However, with the presence of PSS, satisfactory performance is observed. It is also shown that power flow of the interconnection does not have a considerable impact on the damping ratio.