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Abstract

For voltage-source-converter based high-voltage-direct-current (VSC-HVDC) transmission systems, fault ride-through (FRT) capability is a very important grid requirement in order to enhance its operational availability under an alternating current (AC) grid fault condition. Voltage sags during a short-circuit fault in power transmission lines can lead to fluctuations in the direct current (DC) link voltage of converter systems, and may induce reversed power flow and even trip a VSC-HVDC transmission system. A practical method is developed in this paper for investigating FRT capability of VSC-HVDC transmission system characteristics during a voltage sag event using experimental results from Smart Grid Laboratory. Symmetrical and asymmetrical voltage sag events with different remaining voltages are applied to an AC grid that lasts with a variable duration. The experimental waveforms of the two converter systems are recorded and analyzed in order to evaluate the FRT capability of VSC-HVDC transmission systems.
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Bibliography

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Authors and Affiliations

Ngo Minh Khoa
1
ORCID: ORCID
Nguyen An Toan
1
ORCID: ORCID
Doan Duc Tung
1
ORCID: ORCID

  1. Faculty of Engineering and Technology, Quynhon University, Vietnam
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Abstract

Digital metrologywas applied to evaluate 3D models of the unique skull of a fossil tetrapod, Madygenerpeton pustulatum, generated using various 3D digitization methods. The skull surface is covered by minute tubercles making it challenging for digitization with appropriate accuracy. Uniqueness and fragility of the specimen preclude the use of tactile measuring systems for creating a standardized reference model. To overcome this problem, comparative analysis of the triangulated models generated from the clouds of points obtained with seven different devices was conducted using the Geomagic Studio and Autodesk PowerShape CAD software. In the proposed approach, geometrically and dimensionally closest-fitting models underwent detailed statistical analysis between surface polygons in three steps. First, 3D models obtained from different scanning methods were compared with each other in couples. Next, statistical analysis of the differences between the coupled models was performed. Finally, a rating list of the models related to the required accuracy was prepared. The proposed approach is applicable to any other scanned object, especially in palaeontological applications, where each object is unique and exhibits individual features.
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Authors and Affiliations

Yaroslav Garashchenko
1
ORCID: ORCID
Ilja Kogan
2 3
ORCID: ORCID
Mirosław Rucki
4
ORCID: ORCID

  1. National Technical University, Kharkiv Polytechnic Institute, Department of Integrated Technologies of Mechanical Engineering, Kyrpychova Str. 2, Kharkiv, 61002, Ukraine
  2. TU Bergakademie Freiberg, Geological Institute, Bernhard-von-Cotta-Str. 2, 09599 Freiberg, Germany
  3. Kazan Federal University, Institute of Geology and Petroleum Technologies, Kremlyovskaya Str. 4/5, 420008 Kazan, Russia
  4. Faculty of Mechanical Engineering, Kazimierz Pulaski University of Technology and Humanities in Radom, ul. Stasieckiego 54, 26-600 Radom, Poland
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Abstract

The phenomenon of publication, in the same year, of two books having identical titles, is enough to study the theory presented therein. Both books feature the notion of culture, which was broadly elaborated by both authors: Antonina Kłoskowska and Raymond Williams already in their earlier analyses. It turns out, however, that no matter the title of a book interesting to us, culture is tackled differently in both of them. Williams seems to keep using anthropological definition of culture, while Kłoskowska suggests sociological approach. A reflection on culture by the English academic has shaped the character of British cultural studies and their subsequent follow-ups around the world. A question arises, to what extent the sociological approach by Kłoskowska may give impetus to cultural research in Poland, especially when symbolic culture appears beyond the principle of autotelism.

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Authors and Affiliations

Kazimierz Kowalewicz
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Abstract

The paper presents selected simulation and experimental results of a hybrid ECPMS-machine (Electric Controlled Permanent Magnet Synchronous Machine). This permanent magnets (PMs) excited machine offers an extended magnetic field control capability which makes it suitable for battery electric vehicle (BEV) drives. Rotor, stator and the additional direct current control coil of the machine are analyzed in detail. The control system and strategy, the diagram of power supply system and an equivalent circuit model of the ECPMS-machine are presented. Influence of the additional excitation on the performance parameters of the machine, such as: torque, efficiency, speed limits and back-EMF have also been discussed.

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Authors and Affiliations

Ryszard Pałka
Piotr Paplicki
Marcin Wardach
Michał Bonisławski

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