Research on Wide-area Monitoring and Location of Wide-frequency Oscillation in New Type Power System

Wide-frequency oscillations including low-frequency oscillation, sub/super-synchronous oscillation, and high-frequency oscillation have been encountered with the construction of new type power system, which have led to multiple accidents and seriously affected the operational safety of the power grid. Its online monitoring and location is one of the important issues faced by new power systems. Unlike the low-frequency oscillation which is dominated by the traditional synchronous generator, sub/super-synchronous and high-frequency oscillation belong to the category of electromagnetic oscillations, so the existing method is not applicable. A framework for the monitoring and location system of wide-frequency oscillation in the power grid combined with wide-frequency measurement is proposed and application functions are designed in this paper. Based on the characteristics of the oscillations, an oscillation monitoring method combining “FFT+Prony” and master-slave cooperation is proposed to adaptively monitor the oscillation. Further, combined with grid topology, the location method based on dissipating energy flow or active power flow direction is proposed. The effectiveness of the proposed system and method is verified by WECC 240-bus test system and actual grid system.