Kaufhold Elias

eBook, PDF

Measurement-based analysis of harmonic instabilities of single-phase photovoltaic inverters in public low voltage networks (eBook, PDF)

Beschreibung

The transition of power systems from central energy generation to decentralized energy generation leads to a growth of renewable energy generators with power electronic devices in public low voltage networks. In practice, the interaction of a power electronic device and the power grid, i.e. the low voltage network, challenge the device operation, the operation of other grid-connected devices and the network equipment. For a manufacturer, the network characteristics where the device is installed, are typically unknown, e.g. especially for devices in the low power range up to some kW, where the number of manufactured devices is large. The characteristics vary largely between different low voltage networks and even between measurement points within the same low voltage network. For the network operators, the installed devices are unknown, i.e. a black-box, since the manufacturers keep the detailed device designs including the device parameters a manufacturer's secret. With the aim to pursue the climate goals, renewable energy generators become more important. One of the main renewable energy generators are low power photovoltaic systems. These photovoltaic systems are connected to the grid via single-phase in-verters. The stable operation of the inverter is consequently relevant for the reliability of power systems. One of the phenomena that challenge the stable operation of inverters are harmonic instabilities. The harmonic stability analysis identifies an instable opera-tion of an inverter based on the interaction of the inverter control as well as the AC-side filter circuit and the network impedance in the harmonic frequency range, i.e. above 50 Hz up to 2 kHz. In this dissertation, the currently known theory is extended to enable measurement-based assessments of the harmonic stability of unknown single-phase inverters for photovoltaic applications. The studied single-phase inverters are commercially available while in addition simulation models are developed. Advancements of the measure-ment-based model identification and the harmonic stability analysis are presented and validated. Next to theoretic test cases, impedance characteristics of real low voltage networks are also included to assess the harmonic stability of the inverters. As a con-clusive result, device design recommendations are derived from the findings of the assessment and limitations of the harmonic stability with regard to the overall stable operation of the inverter are presented.

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Autor

Elias Kaufhold received his Dipl.-Ing. degree in electrical engineering from TU Dresden, Germany, in 2018. He worked at SIEMENS in the Industry Sector in Berlin, Germany, from 2013 until 2016 in the Drive Technologies Division and later in the Process Industries and Drives Division focusing on simulations and calculations for special machines and prototypes of large drives. From 2016 to 2017, he worked as an intern consultant in the energy division of the P3 Group in Aachen, Germany, with focus on the rollout of charging infrastructure of electric vehicles and threats and attack vectors in communication structures in public energy networks. During that time, he was also active member of Engineers without Borders in the field of poverty alleviation with regard to the implementation of a local low voltage network in a small town in Nepal. From 2017 to 2018, he was member of the network² program of the German low voltage network operator Netze BW. In 2018, he started a position as scientific researcher at TU Dresden, at the Institute of Electrical Power Systems and High Voltage Engineering in the field of power electronics and power systems with focus on power quality, modeling, control and stability assessment. During his time at the Institute, he lectured classes with focus on fundamentals and the operation of electric power grids and was student supervisor. He became IEEE member in 2021 and author, speaker, conference board member and reviewer for various conferences and journals including IEEE, MDPI etc. In 2021, he was a guest researcher at Aalborg University, Denmark, at the section Power Electronics System Integration and Materials. In 2025, he defended successfully his Doctoral thesis at TU Dresden. Since 2023, he is with Enotrac AG in the Energy Division in the sector of electric railways in Thun, Switzerland.

Produktdetails

• Verlag: BoD - Books on Demand
• Seitenzahl: 202
• Erscheinungstermin: 16. Mai 2025
• Englisch
• ISBN-13: 9783769361704
• Artikelnr.: 74232462