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

Matthias Buchner and Krzysztof Rudion
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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

Energies, 2021, vol. 14, issue 21, 1-23

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.

Keywords: impedance-based stability; small-signal stability; power electronics; harmonic disturbances; spectral leakage; broadband signals; pseudo random binary sequence (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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