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Abstract

The paper suggests an improved method of active power distribution among the gas-diesel generators operating in parallel; the method involves the control of torque and the angular positions of their rotors. The use of the suggested approach to the solution of the active power distribution task in the presence of instability of drive motor speed provides the increase of autonomous power system operation efficacy and rising the power unit’s performance. The authors analyzed the causes of generation of low-frequency fluctuations of generator drive engine speed; in autonomous electric power systems, gas diesel generators are increasingly used as such generator drive engines. It is suggested to use the developed method and structure of the optical device for control of rotation period and the measurement of the generator rotor angle position characterized with high accuracy, as the sensor. The authors developed a schematic diagram of active power distribution among the generators operating in parallel, which uses the cross feedback for gas-powered diesel engine shafts momentum and the generator rotor angle position. They obtained experimental results confirming the efficiency of the suggested active power distribution method and its practical implementation.
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Bibliography

[1] Kamala, Srinivasarao, Chauhan, Priyesh, Panda, Sanjib, Wilson, Gary, Liu, Xiong, & Gupta, Amit. (2015). Optimal scheduling of diesel generators in offshore support vessels to minimize fuel consumption. In Proc. of the IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society. Yokohama, Japan, 4726–4231. https://doi.org/10.1109/IECON.2015.7392838
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[9] Yasin, Karagoz, Tarkan, Sandalci, Umit O, Koylu, Ahmet Selim, Dalkilic, & Somchai, Wongwises. (2016). Effect of the use of natural gas-diesel fuel mixture on performance, emissions, and combustion characteristics of a compression ignition engine. Advances in Mechanical Engineering, 8 (4), 1–13. https://doi.org/10.1177/1687814016643228
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Authors and Affiliations

Abdullah M. Eial Awwad
1
Mahmoud M. S. Al-Suod
1
Alaa M. Al-Quteimat
1
O.O. Ushkarenko
2
Atia AlHawamleh
1

  1. Department of Electrical Power Engineering and Mechatronics, Tafila Technical University, Tafila, Jordan
  2. Department of Electrical and Electronics Engineering, Admiral Makarov National University of Shipbuilding, Mykolaiv, Ukraine
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Abstract

The largest glacier of the Petuniabukta area is the Hörbyebreen. It is among the tew on Spitsbergen whose marginal zones undergo areal decay. What has made in this type of glacier is a rich supra-glacial moraine cover that was formed as a result of a deformation of debris bands in the frontal part following a surge. In the marginal zone three subzones were distinguished differing in the degree of degradation of passive ice that covers almost all its area. They also differ in the stability of deposits and in the relief.

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Authors and Affiliations

Andrzej Karczewski
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Abstract

This paper presents the method of analysis of parametric systems in frequency domain. These systems are also referred to as linear time varying systems (LTV). The article includes a description of an analytical method for determining the frequency response of the first order parametric circuit with non-periodically variable parameters. The results have been illustrated by an example.

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Authors and Affiliations

Anna Piwowar
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Abstract

Notes about a handbook of Italian grammar by a Croatian philologist Dragutin Antun Parčić – A handbook of Italian grammar, written in Croatian by Croatian philologist Parčić, confirms that in the past educated Croatian-speaking people were bilingual and at the same time it proves that lower classes aimed to study Italian as well. The paper analyses the functionality and appropriateness of topics presented in the Parčić manuscript because it is obvious that the author was keen to help his Croatian-speaking students in the acquisition of Italian.

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Authors and Affiliations

Vesna Deželjin
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Abstract

The evaluation of a resercher`s life work often does not include, or underestimates, articles written for the Polish Biographical Dictionary. To compensate for this gap, I wish to introduce a short outline of the issues discussed by Józef Andrzej Gierowski in his biographical work, supplemented by a list of the 52 biographies he was aurhor author of. This article`s aim is to highlighting his contributions to the research of the history of the local and central elites of the Polish‑Lithuanian Commonwealth, both by examples and the by listing.
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Authors and Affiliations

Maria Czeppe
1
ORCID: ORCID

  1. Instytut Historii Polskiej Akademii Nauk

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