EA007 – Observed Oscillations with New Wind Gen near Steel Mill

An oscillation was observed in the frequency and voltage data from a single PMU in an area with several PMUs.  The map below (see Figure 1) shows the relative location of three PMUs on the NPPD system.  A significant customer (steel mill) is physically located somewhere near the end of the word “Antelope” on the map.  Some wind farms were recently added in the same area with a point of interconnect at the Antelope location.