ETG-Literatur-Test
VDE ETG
05.08.2020

Aktuelle ETG Literaturpreisträger

Der ETG Literaturpreis wurde in diesem Jahr an drei Personen verliehen:

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Seifert-Robert

2020 Robert Seifert

Einführung in die fraktionale Flussschätzung in elekltromagnetischen Aktoren

Seifert-Robert

Einführung in die fraktionale Flussschätzung in elekltromagnetischen Aktoren

In diesem Artikel wird erstmalig ein neuartiger fraktionaler Flussschätzer vorgestellt, der das atypische Übertragungsverhalten zwischen dem messbaren Aktorstrom und der kraftproportialen Flussdichte über eine große Bandbreite mit hoher Genauigkeit abbilden kann. Am Beispiel einer Ringkernspule wird die gesamte Vorgehensweise von der Modellbildung über dessen Approximation und Diskretisierung bis zur hardwareseitigen Implementierung nachvollzogen. Die abschließenden Messungen zeigen das große Potential einer schätzerbasierten Flussdichteregelung für hochdynamische Aktoren und Magnetlager.

Erschienen in: at-Automatisierungstechnik, Band 67, Heft 7 (2019) doi.org/10.1515/auto-2018-0075 am 6. Juli 2019

Tobias Gabler

2020 Tobias Gabler

Dielectric Modeling of Oil-paper Insulation Systems at High DC Voltage Stress Using a Charge-carrier-based Approach

Tobias Gabler

Dielectric Modeling of Oil-paper Insulation Systems at High DC Voltage Stress Using a Charge-carrier-based Approach

It is state-of-the-art to describe the dielectric behavior of an insulation material permittivity and its specific electric conductivity in order to estimate the dielectric of an insulation system. Thus, the electric field at DC voltage stress is determined according to the stationary electrical conduction field with the electric conductivity insulation materials. However, at oil-insulated arrangements a higher field strength front of bare metal electrodes at high DC voltage stress occurs, which is not explainable with this model. Therefore, a charge carrier-based approach is presented to describe dielectric behavior of the oil-paper insulation. It describes the movement of carriers and their effect on the electric field strength. Their drift leads to an accumulation of charge carriers in front of electrodes which results in a higher field strength areas, which can be calculated numerically using the Poisson-Nernst-Planck system. Compared to the conductivity-based model fundamental differences shown. Breakdown experiments qualitatively confirm the expectations according charge carrier-based approach. The results show that the charge carrier-based distribution has to be considered for modelling the electrical field strength distribution at high DC voltage stress. They also show, that the dielectric behavior
arrangements cannot be explained according to the state-of-the-art model.

Erschienen in: IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 26, No. 5 am 3. Oktober 2019

Palm. Sebastian

2020 Dr. Sebastian Palm

Evaluation and Comparison of Islanding Detection Methods by extended Analysis of the non detection zone

Palm. Sebastian

Evaluation and Comparison of Islanding Detection Methods by extended Analysis of the non detection zone

The ongoing decentralization of the electrical energy system due to distributed generation leads to an increased occurrence of unintentional electrical islands. By using realistic models of distributed generation units and electrical loads, simulations of the transition processes after grid disconnection are carried out. From the results of the simulations, parameters are derived that can be used for an objective evaluation and comparison of different islanding detection methods. For this purpose, undetected unintentional electrical islands as well as the speed of successful islanding detections are analyzed by dynamic simulations and the individual Non Detection Zones. 

Erschienen in: CIRED, 25th International Conference on Electricity Distribution, Juni 2019