Impact of Increased Penetration of Wind Power on Damping of Low Frequency Oscillations in Different Network Topologies

In this paper, the impact of increased penetration of wind generation on the damping of the inter-area modes in two different topologies of a three area test system is studied. Four different scenarios based on different power trading schemes between areas are defined and the role of tie-line power in the evolution of the inter-area modes is evaluated. The results magnify the importance of the tie-line power on the beneficial or adverse effect of increased wind power on the damping of the inter-area modes. It is seen the the modes are adversely affected when the wind power is increased in an area that exports power to remote areas. On the other hand, the damping of the inter-area modes improve when areas with significant wind generation import power from remote areas. Furthermore, it is seen that the inter-area modes are less affected in a more inter-connected system like ring topology compared to a string topology. PowerFactory DIgSILENT is used for the modal analysis and the penetration of wind power is increased by displacing conventional synchronous generators.