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DFT-Based Identification of Oscillation Modes from PMU Data Using an Exponential Window Function

Author

Listed:
  • Jin Kwon Hwang

    (Department of Energy Electrical Engineering, Woosuk University, Jinchon-gun 365-803, Korea)

  • Sangsoo Seo

    (Smart Power Grid Research Center, Korea Electrotechnology Institute, Uiwang-si 16029, Korea)

  • Julian Sotelo Castanon

    (Department of Electrical Mechanical Engineering, The University of Guadalajara, Jalisco 44100, Mexico)

  • Ho-Chan Kim

    (Department of Electrical Engineering, Jeju National University, Jeju-si 63243, Korea)

Abstract

The characteristics of oscillation modes, such as interarea, regional, and subsynchronous modes, can vary during a power system fault, which can cause switching and control actions in the power system. Transient data of the modal response due to such a fault can be acquired through phasor measurement units (PMUs). When the transient data have a long duration, it is desirable to perform modal identification separately on each segment of the transient data, so as to reflect the varying characteristics of oscillation modes. A conventional discrete Fourier transform (DFT)-based method for parametric modal identification cannot be efficiently applied to such a segment dataset. In this paper, a DFT-based method with an exponential window function is proposed to identify oscillation modes from each segment of transient data in PMUs. This window function allows the application of the least squares method (LSM) for modal identification in the same manner as the conventional method. The accuracy of identification of the proposed method is compared with those of the conventional method and a Prony method through synthetic data of transient responses. Its feasibility is also verified by identifying real-world oscillation modes from transient data in PMUs.

Suggested Citation

  • Jin Kwon Hwang & Sangsoo Seo & Julian Sotelo Castanon & Ho-Chan Kim, 2019. "DFT-Based Identification of Oscillation Modes from PMU Data Using an Exponential Window Function," Energies, MDPI, vol. 12(22), pages 1-16, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:22:p:4357-:d:287329
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