Buchner, MatthiasRudion, Krzysztof2022-10-072022-10-0720211996-10731822695279http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-124452http://elib.uni-stuttgart.de/handle/11682/12445http://dx.doi.org/10.18419/opus-12426Grid 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.eninfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/4.0/621.3article2021-12-01