<abstract xmlns="http://www.w3.org/1999/xhtml">This paper compares semiconductor losses of the galvanically isolated quasi-Z-source converter and full-bridge boost DC-DC converter with active clamping circuit. Operation principle of both converters is described. Short design guidelines are provided as well. Results of steady state analysis are used to calculate semiconductor power losses for both converters. Analytical expressions are derived for all types of semiconductor power losses present in these converters. The theoretical results were verified by means of numerical simulation performed in the PSIM simulation software. Its add-on module “Thermal module” was used to estimate semiconductor power losses using the datasheet parameters of the selected semiconductor devices. Results of calculations and simulation study were obtained for four operating points with different input voltage and constant input current to compare performance of the converters in renewable applications, like photovoltaic, where input voltage and power can vary significantly. Power loss breakdown is detailed and its dependence on the converter output power is analyzed. Recommendations are given for the use of the converter topologies in applications with low input voltage and relatively high input current.</abstract>

Tallinn University of Technology/Chernihiv Nat. University of Technology

Comparative Analysis of Semiconductor Power Losses of Galvanically Isolated Quasi-Z-Source and Full-Bridge Boost DC-DC Converters

<abstract xmlns="http://www.w3.org/1999/xhtml">The paper suggests a method of obtaining an approximate solution of the infinite noncooperative game on the unit hypercube. The method is based on sampling uniformly the players’ payoff functions with the constant step along each of the hypercube dimensions. The author states the conditions for a sufficiently accurate sampling and suggests the method of reshaping the multidimensional matrix of the player’s payoff values, being the former player’s payoff function before its sampling, into a matrix with minimally possible number of dimensions, where also maintenance of one-to-one indexing has been provided. Requirements for finite NE-strategy from NE (Nash equilibrium) solution of the finite game as the initial infinite game approximation are given as definitions of the approximate solution consistency. The approximate solution consistency ensures its relative independence upon the sampling step within its minimal neighborhood or the minimally decreased sampling step. The ultimate reshaping of multidimensional matrices of players’ payoff values to the minimal number of dimensions, being equal to the number of players, stimulates shortened computations.</abstract>

Uniform Sampling of the Infinite Noncooperative Game on Unit Hypercube and Reshaping Ultimately Multidimensional Matrices of Player’s Payoff Values

<abstract xmlns="http://www.w3.org/1999/xhtml">This paper describes the research on adaptronic systems made by the author and offers to use biosensors that can be later inserted into the adaptronic systems. Adaptronic systems are based, on the one hand, on the adaptronic approach when the system is designed not to always meet the worst condition, but to change the structure of the system according to the external conditions. On the other hand, it is an extension of common automatic control ad adaptive systems. So, in the introduction firstly the adaptronic approach and biosensor as a term is explained. Adaptive systems, upon which adaptronic ones are based, are also mentioned. Then the construction of biosensor is described, as well as some information is given about the classification of biosensors and their main groups. Also it is suggested to use lichen indicators in industry to control concentration of chemical substances in the air. After that mathematical models and computer experiments for adaptronic system and biosensor analysis are given.</abstract>

Research in Adaptronic Automatic Control System and Biosensor System Modelling

<abstract xmlns="http://www.w3.org/1999/xhtml">Precision measurements of friction processes have a key role in a variety of industrial processes. The emergence of fine electronic circuit techniques greatly expands capabilities of control. There are some difficulties for their full implementation today, especially when it regards the accuracy and frequency of measurements. The motion-measuring method in real-time system is considered in this article, paying special attention to increased accuracy. This method is based on rapid analog digital converter (ADC), transmission program and digital signal processor (DSP) algorithms. Description of laboratory devices is included: Tribal-T and universal friction machine (MTU-01) designed for “Pin on disc” tests. Great emphasis is placed on the usability of accelerometers. The present study examined the collected data via laboratory system for data acquisition and control, and processing it in the laboratory of Biotribology. Laboratory supervisory control and data acquisition (SCADA) algorithms is described below. Task of regulation is not considered. This paper describes only methods of automatic control theory to analyze the frictional quality.</abstract>

National Research University of Information Technologies, Mechanics and Optics – ITMO

Measurement Instruments and Software Used in Biotribology Research Laboratory

<abstract xmlns="http://www.w3.org/1999/xhtml">A method of technical diagnostics of ship diesel engine – generator installation – is proposed. Spectral-power diagnostic parameters of the synchronous generator voltage and currents are used. The electric machine in this case is the multipurpose sensor of diagnostic parameters. A judgment on the quality of the operational processes in diesel engine cylinders and its technical condition is possible on the basis of these parameters. This method is applicable to piston compressor installations with electric drive. On the basis of such parameters as rotating torque, angular speed and angular acceleration it is possible to estimate the quality of the operating process in the cylinders of a diesel engine, the condition of its cylinder-piston group and the crank gear mechanism. The investigation was realized on the basis of a diesel-generator with linear load. The generator operation was considered for the case of constant RL load. Together with the above mentioned, the condition of bearings of synchronous machines, uniformity of the air gap, windings of the electric machine were estimated during the experiments as well. The frequency spectrum of the stator current of the generator was researched and analyzed. In this case the synchronous machine is becoming a rather exact multipurpose diagnostic sensor. The signal of non-uniformity in the operation process of diesel engine cylinders and its technical condition is the increasing of the amplitudes of typical frequencies.</abstract>

Voltage Spectral Structure as a Parameter of System Technical Diagnostics of Ship Diesel Engine-Synchronous Generators

AHEAD OF PRINT

Volume 19 (2023): Issue 1 (June 2023)

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Electrical, Control and Communication Engineering

The aim of the Journal of Electrical, Control and Communication Engineering of Riga Technical University (RTU-ECCE Journal) is to provide an on-line forum for scientific discussions and feedbacks from the scientific society to particular scientists from all over the world on their later scientific achievements in the below mentioned fields.　The journal considers publication of all authors, but gives preference to the post-conference papers after one of the following events (International Scientific Conferences on Power and Electrical Engineering of Riga Technical University - RTUCON, Workshops on Advances in Information, Electronic and Electrical Engineering – AIEEE, International Doctoral School of Electrical Energy Conversion and Saving Technologies of Riga Technical University, Doctoral School of Energy and Geotechnology of TalTech), as well as the papers recommended by section editors of the journal. The submissions are reviewed, edited and published in the mentioned priority order.  The scope of RTU-ECCE journal includes (but not limited to) the following areas:    Electrical Engineering and Power Electronics:     Electrical machines, Apparatus, Drives, Motion Control and Robotics;    Components, Design and Application of Power Electronic Converters;    Electromagnetic Compatibility and Interference of Electrical Equipment;    Electrical Materials, Reliability and Diagnostics;    Medical and other Bio-contact Electrical Equipment.    Power and Energy Systems:     Power System Control, Automation, Stability and Protection;    Power Quality and Reliability;    Power Plants, Renewable and Distributed Energy Systems;    Power System Planning, Management, Economic Evaluation and Risk Assessment;    Electricity Market;    Smart Grids &amp; Microgrids.    Information Processing in the context of Electrical and Power Engineering     Electronic Circuits and Systems for Control Applications;    Control Theory, Analysis, Simulation and Implementation Software;    Principles of Physical Transmission and Processing of Information, New Interfaces and Protocols.    Microwave Technique and Antennas     Theory, Analysis and Simulation of Microwave Technique;    Software and Experimental Methods Dedicated for Microwave Equipment;    Antennas, Radar Systems and other Microwave Applications.  The editorial board of RTU-ECCE Journal is always open for discussion on the journal topics.   In 2012 the journal Electrical, Control and Communication Engineering separated from the RTU journal series Power and Electrical Engineering. Why subscribe and read  Electrical, Control and Communication Engineering is a peer-reviewed journal providing the latest information in the field of electrical engineering and information technologies. The journal focuses on recent research in electrical and control engineering paying special attention to the reports which have the most significant practical importance.The journal includes a wide range of publications on electrical and electronic equipment, as well as on other means for energy conversion, information processing and transmission purposes.  Why submit  The journal provides highly qualified feedback on the research, as well as international publicity. The editorial board will continuously care about the citation level of the journal.  Rejection Rate   30%   Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 