Locating Forced Oscillation Sources in Power Systems Using Time-Frequency Representation Based on the Multisynchrosqueezing Transform

Forced oscillations (FOs) present a significant obstacle to the secure and stable operation of power systems. Therefore, rapidly and precisely localizing the source of FOs is crucial to suppressing these oscillations. This paper puts forward a method for localizing FOs sources in the time-frequency domain by employing the multisynchrosqueezing transform (MSST) on wide-area measurement data. Initially, the proposed method performs the MSST on the measurement data and subsequently utilizes ridge extraction to obtain the frequency trajectory that represents the FOs mode in the time-frequency plane, thereby enabling the reconstruction of the FOs component matrix. Then, based on this matrix, a time-frequency domain dissipation energy flow calculation method for the FOs component is constructed. Subsequently, the FOs source is located according to the FOs source criterion. Finally, the proposed method is simulated and verified using the WECC 179 test power system, and the result indicate that the proposed method is precise and effective.