Nauki Techniczne

Archives of Electrical Engineering

Content

Archives of Electrical Engineering | 2017 | 2017 |

Abstract: Abstract: The specific duality and asymptotic stability of the positive linear electrical circuits are addressed. The specific duality of positive linear electrical circuits composed of resistances, inductances, capacitances and source voltages is established. 1) The linear electrical circuits are positive if and only if the common branches between meshes with resistances and inductances and meshes with resistances and capacitances contain only source voltages; 2) In linear electrical circuits the interchanges of the inductances by the capacitances and the capacitances by inductances do not change the asymptotic stability of the electrical circuits. The asymptotic stability of the positive and nonpositive elec-trical circuits is analyzed.Abstract: The specific duality and asymptotic stability of the positive linear electrical circuits are addressed. The specific duality of positive linear electrical circuits composed of resistances, inductances, capacitances and source voltages is established. 1) The linear electrical circuits are positive if and only if the common branches between meshes with resistances and inductances and meshes with resistances and capacitances contain only source voltages; 2) In linear electrical circuits the interchanges of the inductances by the capacitances and the capacitances by inductances do not change the asymptotic stability of the electrical circuits. The asymptotic stability of the positive and nonpositive elec-trical circuits is analyzed.
Abstract: Abstract: This paper presents the results of a computer simulation of coaxial magnetocumulative current generators (MCGs). The simulation tests were carried out for different values of the internal diameter, length and speed of the deformation of the MGP element.
Abstract: Abstract: The paper aims at presenting the influence of an open-loop time delay on the stability and tracking performance of a second-order open-loop system and continuous-time fractional-order PI controller. The tuning method of this controller is based on Her-mite-Biehler and Pontryagin theorems, and the tracking performance is evaluated on the basis of two integral performance indices, namely IAE and ISE. The paper extends the results and methodology presented in previous work of the authors to analysis of the in-fluence of time delay on the closed-loop system taking its destabilizing properties into ac-count, as well as concerning possible application of the presented results and used models.
Abstract: Abstract: Superconducting magnets in the SIS100 particle accelerator require the supply of liquid helium and electric current. Both are transported with by-pass lines designed at Wrocław University of Technology. Bus-bars used to transfer an electric current between the sections of the accelerator will be encased in a steel shell. Eddy currents are expected to appear in the shell during fast-ramp operation of magnets. Heat generation, which should be limited in any cryogenic system, will appear in the shell. In this work the amount of heat generated is assessed depending on the geometry of an assembly of the bus-bars and the shell. Numerical and analytical calculations are described. It was found that heat generation in the shell is relatively small when compared to other sources present in the accelerator and its value strongly depends on the geometry of the shell. The distribution of eddy currents and generated heat for different geometrical options are presented. Based on the results of the calculations the optimal design is proposed.
Abstract: Abstract: Arresters are widely used in power systems to protect other equipment against overvoltages. However, in some conditions, they can’t operate successfully. One of the disturbances leading to the failure of the riser pole arresters is the ferroresonance over-voltages. In this paper, at first the influence of different transformer simulation models of ATP software on the occurrence of ferroresonance is studied and then the effect of ferro-resonance on the riser pole arrester has been scrutinized through the thermal and elec-trical performance of the arrester in an underground distribution system. The results show that the arrester temperature rises due to energy dissipation in a ferroresonance circumstance, which indeed may result into the explosion of the arrester. Also, applying different models of the transformer in the ATP software and comparing the results, it is shown that the available models do not show the same effect on the arrester.
Abstract: Abstract: This paper presents the small signal modeling using the state space averaging technique and reliability analysis of a three-phase z-source ac-ac converter. By control-ling the shoot-through duty ratio, it can operate in buck-boost mode and maintain desired output voltage during voltage sag and surge condition. It has faster dynamic response and higher efficiency as compared to the traditional voltage regulator. Small signal analysis derives different control transfer functions and this leads to design a suitable controller for a closed loop system during supply voltage variation. The closed loop system of the converter with a PID controller eliminates the transients in output voltage and provides steady state regulated output. The proposed model designed in the RT-LAB and executed in a field programming gate array (FPGA)-based real-time digital simulator at a fixed-time step of 10 μs and a constant switching frequency of 10 kHz. The simulator was de-veloped using very high speed integrated circuit hardware description language (VHDL), making it versatile and moveable. Hardware-in-the-loop (HIL) simulation results are pre-sented to justify the MATLAB simulation results during supply voltage variation of the three phase z-source ac-ac converter. The reliability analysis has been applied to the converter to find out the failure rate of its different components.
Abstract: Abstract: Microwave devices are widely used in the industry and in the specialized labo-ratory analyses. Development of such devices requires the possibility of modeling of microwave energy distribution in the specific resonant chambers. Until now, such mo-deling was possible only with the use of commercial software or was limited to specific cases. The paper presents an open-source module for ELMER software for solving time-harmonic Maxwell’s equations, allowing modeling of microwave waveguide lines. Three test cases of different resonant chambers are investigated at 2.45 GHz frequency. Model-ing results obtained from the open-source ELMER Vectorial Helmholtz module show that the application of this software can be effective in R&D works, enabling high-tech small and medium enterprises involvement in advanced microwave technology.
Abstract: Abstract: The paper presents the design procedure and elaborated software for designing calculation of the shape memory alloy (SMA) actuator. The thermo-mechanical behavior of a linear SMA actuator has been studied. The experimental set-up was especially de-signed to perform the thermo-mechanical characterization of SMA wires. The stroke (s) – temperature (T) hysteresis characteristics have been determined. The cycle of heating and cooling has been performed under a constant load. The model for the SMA actuator s – T behavior has been proposed and successfully implemented. The selected results and conclusions have been presented. The concept proposal of the linear actuator using the SMA wire has been given.
Abstract: Abstract: An attempt to increase the geometric size of the interrogation zone in UHF RFID systems with a phased array antenna is presented in this paper. The interrogation zone should be as large as possible. However, energy can be transferred to transponders only to a limited distance. The greatest flexibility in developing RFID applications and shaping the interrogation zone can be achieved using a phased array antenna. The per-ceived issues have been effectively dealt with and the solution has been proposed on the basis of an elaborated model. Conducted studies have been used to develop a software tool in the Mathcad environment. The research results are analyzed in detail for different system configurations and can be implemented in practical projects to be developed in cooperation with the industry.
Abstract: Abstract: This paper presents a novel, low-complexity method of simulating PV source characteristics suitable for real-time modeling and hardware implementation. The appli-cation of the suitable model of the PV source as well as the model of all the PV system components in a real-time hardware gives a safe, fast and low cost method of testing PV systems. The paper demonstrates the concept of the PV array model and the hardware implementation in FPGAs of the system which combines two PV arrays. The obtained results confirm that the proposed model is of low complexity and can be suitable for hardware in the loop (HIL) tests of the complex PV system control, with various arrays operating under different conditions.
Abstract: Abstract: Researchers have used various methods to determine the parameters of trans-former-equivalent circuits in transient studies. But most of these previous algorithms had difficulty finding the equivalent circuit parameters in a bigger model. This paper presents a new method to extract the inductance matrix of a detailed model for an air core winding for transient studies using frequency-response measurement data. This matrix can be de-termined with acceptable accuracy by using the proposed method. The biggest advantage of the proposed method is a reduction in the search space, and thus, speedier problem-solving. Simulations showed that the use of the proposed method leads to better beha-vioural quality of a transformer winding. The simulation results of the previous and pro-posed methods were compared with the help of a 20/0.4 kV, 1600 kVA transformer. This comparison showed the accuracy and superiority of the proposed method.
Abstract: Abstract: Electric vehicles (EVs) can be utilized as mobile storages in a power system. The use of battery chargers can cause current harmonics in the supplied AC system. In order to analyze the impact of different EVs with regardto their number and their emis-sion of current harmonics, a generic harmonic current model of EV types was built and implemented in the power system simulation tool PSS®NETOMAC. Based on the measurement data for different types of EVs three standardized harmonic EV models were developed and parametrized. Further, the identified harmonic models are used by the computation of load flow in a modeled, German power distribution system. As a benchmark, a case scenario was studied regarding a high market penetration of EVs in the year 2030 for Germany. The impact of the EV charging on the power distribution system was analyzed and evaluated with valid power quality standards.
Abstract: Abstract: The torque profile of a double-stator permanent magnet (PM) synchronous machine of 90 mm stator diameter having different rotor pole numbers as well as dual excitation is investigated in this paper. The analysis includes a comparative study of the machine’s torque and power-speed curves, static torque and inductance characteristics, losses and unbalanced magnetic force. The most promising flux-weakening potential is revealed in 13- and 7-rotor pole machines. Moreover, the machines having different rotor/stator (Nr/Ns) pole combinations of the form Nr = Ns ± 1 have balanced and sym-metric static torque waveforms variation with the rotor position in contrast to the ma-chines having Nr = Ns ± 2. Further, the inductance results of the analyzed machines re-veal that the machines with odd rotor pole numbers have better fault-tolerant capability than their even rotor pole equivalents. A prototype of the developed double-stator ma-chine having a 13-pole rotor is manufactured and tested for verification.
Abstract: Abstract: In-wheel electric drives are promising as actuators in active safety systems of electric and hybrid vehicles. This new function requires dedicated control algorithms, making it essential to deliver models that reflect better the wheel-torque control dyna-mics of electric drives. The timing of digital control events, whose importance is stressed in current research, still lacks an analytical description allowing for modeling its in-fluence on control system dynamics. In this paper, authors investigate and compare ap-proaches to the analog and discrete analytical modeling of torque control loop in digitally controlled electric drive. Five different analytical models of stator current torque com-ponent control are compared to judge their accuracy in representing drive control dyna-mics related to the timing of digital control events. The Bode characteristics and step-response characteristics of the analytical models are then compared with those of a re-ference model for three commonly used cases of motor discrete control schemes. Finally, the applicability of the presented models is discussed.
Abstract: Abstract: In this study, a new circuit topology using a Z-source resonant inverter (ZSRI) for high power applications in large-air-gap contactless power transfer (CPT) systems, has been investigated. The main shortcoming of a large-air-gap CPT system is the poor power transfer efficiency due to low magnetic coupling. In order to minimize this short-coming and to improve the overall performance of the system by boosting the power transfer capability, in this paper a CPT system with the newly developed circuit topology using high frequency Z-source resonant inverter has been proposed. Using the newly developed circuit topology for the CPT system, it has been observed that the overall per-formance of the system has been improved to a reasonable level with a purely sinusoidal resonant current flowing through the primary side. Therefore, no harmonics will be in-jected into the source. The proposed CPT system with an air gap of 16 cm and a misa-lignment of 3 cm has been simulated using the Maxwell finite element tool and Simp-lorer circuit simulation software for an output power of 2 kW.
Abstract: Abstract: This paper reports on analyses and testing of sensitive power electronics com-ponents encapsulation concept, enabling operation in harsh, especially high pressure environments. The paper describes development of the concept of epoxy modules that can be used for protecting of the power electronics components against harsh environ-mental conditions. It covers modeling of the protective capsules using a simple analytical approach and Finite Element Method (FEM) models and validation of the developed models with the high pressure tests on samples fabricated. The analyses covered two types of the epoxy modules: of sphere- and elongated- shape, both with electrical pene-trators that enable electrical connection of the encapsulated components with external po-wer sources as well as other power modules and components. The tests were conducted in a pressure chamber, with a maximum applied pressure of 310 bars, for which online strain measurements have been conducted. The experimental results were compared with the simulation results obtained with analytical and FEM models, providing validation of the models employed. The experimental part of this work was conducted in collaboration with Polish Naval Academy in Gdynia.
Abstract: Abstract: This paper is focused on creation, accuracy and simulation of 2-parameter control of a mathematical model for motion of aircraft in a flying simulator. We are dis-cussing many of important advances in applied aircraft modeling. Modelling on various computer architectures (central, parallel, distributed) has an impact on a structure of a si-mulator system of aircraft. The way of description of a numerical method and its ac-curacy, a shared memory system and a distributed memory system, is an important part. Necessary accuracy of implemented simulation methods, an analytical approach to defi-nition of mathematical models, and corresponding simulation implementation architect-tures are presented in the article.

Editorial office

Editor-in-Chief
Professor Andrzej Demenko, Poznan University of Technology, Poland

Deputy/ Managing Editor
Mariusz Barański, Ph.D., Poznan University of Technology, Poland

Editorial Advisory Board
Chairman: Marian P. Kaźmierkowski, Warsaw, Poland
Secretary: Grzegorz Benysek, Zielona Gora, Poland

Members professors:
Antero Arkkio, Helsinki, Finland

Frede Blaabjerg,Aalborg, Denmark

Ion Boldea,Timisoara, Romania

Stanisław Bolkowski, Białystok, Poland

Herbert De Gersem,Darmstadt, Germany

Jacek Gieras, Rockford, USA

Kay Hameyer, Aachen, Germany

Mieczysław Hering,Warszawa, Poland

Marian K. Kazimierczuk, Dayton, USA
Stefan Kulig, Dortmund, Germany
David A. Lowther, Montreal, Canada
Jacek Marecki, Gdańsk, Poland

José Rodríguez Pérez,Valparaíso, Chile

Ryszard Sikora, Szczecin, Poland
Zbigniew Styczyński, Magdeburg, Germany
Jan Sykulski, Southampton, UK

 

Technical Editor

Ewa Rozmiarek, Scientific Publishers OWN, Institute of Bioorganic Chemistry Polish Academy of Sciences, Poland

Language Editor

Krystyna Guzek

Statistical Editor

Mariusz Barański, Poznan, Poland
Poznan University of Technology

Theme Editors

Mieczysław Hering, Warszawa, Poland
Professor at Warsaw University of Technology

Zbigniew Lubosny, Gdansk, Poland
Professor at Gdańnk University of Technology

Marian Łukaniszyn, Opole, Poland
Professor at Opole University of Technology

Marian Pasko, Gliwice, Poland
Professor at Silesian University of Technology

Stanisław Piróg, Krakow, Poland
Professor at AGH University of Science and Technology

Henryka Danuta Stryczewska, Lublin, Poland
Professor at Lublin University of Technology

Jan Sykulski, Southampton, UK
Professor at University of Southampton

Adam Szelag, Warsaw, Poland
Professor at Warsaw University of Technology

Romulad Włodek, Krakow, Poland
Professor at AGH University of Science and Technology

 

Contact

All contributions should be addressed to the Editor-in-Chief or the Editorial Office:

Address of the Editorial Office:

Archives of Electrical Engineering
Piotrowo 3A (Room 612X)
60-965 Poznan, Poland
tel: (48-61) 665-26-36
fax: (48-61) 665-23-81
e-mail: aee@put.poznan.pl

Website: www.aee.put.poznan.pl

Instructions for authors

ARCHIVES OF ELECTRICAL ENGINEERING (previously Archiwum Elektrotechniki), quarterly magazine of Polish Academy of Sciences, has published scientific papers in Polish, English, French or German for over fifty years. Beginning from January 1995 Archives of Electrical Engineering is publishing exlusively in English original scientific articles and short communiques from all branches of Electrical Power Engineering. All published papers are revised. All contributions should be addressed to the Editor-in-Chief or the Editorial Office.


The main fields of interest are related to:

  • theory & engineering of the components of electrical power system: switching devices, reactors, etc. together with basic questions of their insulation, ampacity, switching capability etc.,
  • electrical machines and transformers,
  • modelling & calculation of circuits,
  • electrical & magnetic fields problems,
  • electromagnetic compability,
  • control problems,
  • power electronics,
  • electrical power engineering.
  • mondestructive testing & nondestructive evaluation

 

Technical Details

  • Submission of an ARTICLE to the Archives of Electrical Engineering is understood to imply that the article is original, unpublished and is not being considered for publication elsewhere. The submitted articles should not exceed 70 000 characters (ca. 20 pages on A4 paper with 11 pt font size, single line spacing and 4 cm margins).
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  • REFERENCES in text must be numbered consecutively by Arabic numerals placed in square brackets. Do not include the unpublished data, personal communications or manuscripts "in preparation". Such materials, if necessary, can be included into the text and left unnumbered. Please ensure that all references in the Reference list are cited in the text and vice versa. Please provide name(s) and initials of author(s), title of the paper, editors (if any), title of the journal or book, volume number, the page range, and finally year of publication in brackets. Examples of the ways in which references should be cited are given below:

Journal article

`1` Demenko A., Baranski M., The title of the paper, IEEE Trans. on Magnetics 1(2): 1-7 (2007).

Conference paper

`2` Demenko A., Baranski M., The title of the conference paper, Proc. Int. Conf. Computation in Electromagnetics, Wroclaw, pp. 1-7 (2011).

Book, book chapter and manual

`3` Zienkiewicz O., Taylor T., The Finite Element Method, McGraw-Hill Book Company (1989).

Patent

`4` Jędryczka C., Szelšg W., The title of the patent (if available), Polish Patent, P-123456 (2010).

Thesis

`5` Driesen J., The title of the thesis, PhD Thesis, Faculty of Applied Science, K.U. Leuven (2000).

Website

`6` http://www.aee.put.poznan.pl/, accessed April 2010

    Authors will receive PROOFS for correction, which should be returned promptly. All joint contributions must indicate the name and full address of the author to whom proofs should be sent.
    The authors are asked to submit completed THE MANUSCRIPT SUBMISSION FORM.

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