Shaping power system inter-area oscillations through control loops of grid integrated wind farms

Abstract

This paper presents a control design for shaping the inter-area oscillation spectrum of a large wind-integrated power system. The power system is modeled using a continuum representation of the electro-mechanical swing dynamics with the wind power entering as a spatial point source at a specific electrical distance along the transfer path. The frequency response, particularly that of inter-area oscillations, has previously been shown to be highly sensitive to this location. However, in many situations, it may not be possible to site a wind farm at the location with the most desirable frequency response. Here, we show that one can design a wind farm controller to shape the frequency response of the power system with a wind farm at an arbitrary location to closely resemble that of a system with a more favorable wind injection site. The results are illustrated using simulations based on power system models inspired by US west coast transfer paths such as the Pacific AC Inter-tie.