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Measured Impedance Characteristics of Solar Inverters up to 1 MW

: Rogalla, S.; Kaiser, S.; Burger, B.; Engel, B.

Volltext urn:nbn:de:0011-n-6181606 (604 KByte PDF)
MD5 Fingerprint: 30ccdb90ad02831d16c0caaed95cc7aa
Erstellt am: 17.12.2020

Betancourt, U. ; Energynautics GmbH, Darmstadt:
10th Solar & Storage Integration Workshop 2020. Proceedings : International Workshop on Integration of Solar Power and Storage into Power Systems, 5 November 2020, Virtual Event
Darmstadt: Energynautics GmbH, 2020
ISBN: 978-3-9820080-7-3
6 S.
International Workshop on Integration of Solar Power and Storage into Power Systems <10, 2020, Online>
Bundesministerium fur Wirtschaft und Energie BMWi (Deutschland)
0325757F; NetzHarmonie
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()
Leistungselektronik; Netze und Intelligente Systeme; impedance spectroscopy; stability analysis; Wechselrichter in Netzen

This paper presents an enhanced measurement technique and its application for determining the harmonic characteristics of inverters. With the suggested test method of differential impedance spectroscopy the inverter can be described as a frequency-dependent Thévenin equivalent. Thus, the output impedance and internal harmonic sources can be determined frequency wise. Having this, one can analyze the harmonic interactions between inverters and the grid more precisely. It allows to distinguish between so-called resonance-based harmonics, which result from the effective inverter and grid impedance constellation, and source-driven harmonics, which are introduced by harmonic sources on the inverter or the grid side. First this paper explains the principle of differential impedance spectroscopy and the calculation of the inverter’s Thévenin equivalents. Finally it presents and discusses the measured results from different commercial PV inverters in a power range up to 2.5MVA.