Multi-range signal oscillation detection — Concepts and applications

Oscillations on the power system represent an exchange of real or reactive power between entities on the grid or quantities induced onto the grid or as the result of a resonance. Due to the electromechanical make-up of the grid, oscillations have existed from the beginning power system time. In the beginning, the primary source of oscillations was machine-to-machine hunting - resulting in what is known today as Inter-Area Oscillations. As the power system has grown and expanded into new realms, the sources and frequencies of oscillations have expanded. This paper identifies a set of ranges of sub-synchronous oscillations, introduces a new measurement technique for these oscillations, and identifies possible mitigation strategies.