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Identification of Grid Impedance by Broadband Signals in Power Systems with High Harmonics

Author

Listed:
  • Matthias Buchner

    (Institute of Power Transmission and High Voltage Technology, University of Stuttgart, Pfaffenwaldring 47, 70569 Stuttgart, Germany)

  • Krzysztof Rudion

    (Institute of Power Transmission and High Voltage Technology, University of Stuttgart, Pfaffenwaldring 47, 70569 Stuttgart, Germany)

Abstract

Grid impedance is an important parameter and is used to perform impedance-based stability analysis for the operation of grid-connected systems, such as power electronics-interfaced solar, wind and other distributed power generation systems. The identification of grid impedance with the help of broadband signals is a popular method, but its robustness depends strongly on the harmonic disturbances caused by non-linear loads or power electronics. This paper provides an in-depth analysis of how harmonics affect the identification of grid impedance while using broadband measurements. Furthermore, a compensation method is proposed to remove the disturbing influences of harmonics on broadband impedance identification. This method is based on exploiting the properties of the used maximum-length binary sequence (MLBS). To explain the methodology of the proposed method, the design basis for the excitation signal is discussed in detail. The analysis from simulations and a real measurement in an industrial power grid shows the effectiveness of the proposed method in compensating the disturbing influences of harmonics on broadband impedance measurements.

Suggested Citation

  • Matthias Buchner & Krzysztof Rudion, 2021. "Identification of Grid Impedance by Broadband Signals in Power Systems with High Harmonics," Energies, MDPI, vol. 14(21), pages 1-23, November.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:7398-:d:673329
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    References listed on IDEAS

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    1. Henrik Alenius & Tomi Roinila, 2020. "Impedance-Based Stability Analysis of Paralleled Grid-Connected Rectifiers: Experimental Case Study in a Data Center," Energies, MDPI, vol. 13(8), pages 1-15, April.
    2. Chuanyue Li & Taoufik Qoria & Frederic Colas & Jun Liang & Wenlong Ming & Francois Gruson & Xavier Guillaud, 2019. "Coupling Influence on the dq Impedance Stability Analysis for the Three-Phase Grid-Connected Inverter," Energies, MDPI, vol. 12(19), pages 1-16, September.
    3. Teuvo Suntio & Tuomas Messo & Matias Berg & Henrik Alenius & Tommi Reinikka & Roni Luhtala & Kai Zenger, 2019. "Impedance-Based Interactions in Grid-Tied Three-Phase Inverters in Renewable Energy Applications," Energies, MDPI, vol. 12(3), pages 1-31, January.
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