ELEKTRYKA - Issue 145/2018 - Politechnika Śląska, Wydział Elektryczny

ELEKTRYKA - Issue 145/2018

ELEKTRYKAYear LXIV (2018)

QuarterlyIssue 1(145)

Scientific Committee

CONTENTS

Foreword

Tadeusz KACZOREK: Normal positive linear systems and electrical circuits
Jakub ŹREBIEC, Adam PIŁAT: Identification of electromotive force in BLDC drive
Adam STECKIEWICZ, Bogusław BUTRYŁO: Analysis of magnetic properties of thin-layer materials with conductive periodic structure
Katarzyna NOWAK, Kamil PADUSZYŃSKI: Analysis of factors and hazards associated with electric shock
Ovidiu IVANOV, Mihai GAVRILAS, Calin-Viorel SFINTES, Marian DUMITRACHE: A software tool for electricity market trade price analysis
Nicusor Constantin TOMA, Mihai GAVRILAS, Bogdan Constantin NEAGU: Application of smart metering systems for energy losses assessment and forecasting in distribution systems
Krzysztof SZTYMELSKI: A similar comparison with simulations actual PV on-grid installations with a power of 2 kW
Rafał SETLAK: Battery capacity selecting Algorithm for stationary energy storage system
Marcin FICE: Analysis and parametric discription of electric loads active power profiles
Kamil MIŚLIWIEC, Bożena WIECZOREK: Graph Colouring Algorithms
Norbert LITWIŃCZUK, Maciej SADOWSKI: Software for analysis and presentation of the resonance amplifier dynamic characteristic

Tadeusz KACZOREK

Białystok University of Technology

NORMAL POSITIVE LINEAR SYSTEMS AND ELECTRICAL CIRCUIT

Summary. The notion of normal positive electrical circuits is introduced and some their specific properties are investigated. New state matrices of positive linear systems and electrical circuits are proposed and their properties are analyzed. It is shown that positive electrical circuits with diagonal state matrices are normal for all values of resistances, inductances and capacitances.

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Jakub ŹREBIEC, Adam PIŁAT

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

IDENTIFICATION OF ELECTROMOTIVE FORCE IN BLDC DRIVE

Summary. This paper shows results of identification experiments of electromotive force in BLDC motor, which is typically used in unmanned aerial vehicles - UAV. Electromotive force is commonly included in equations of mathematical model of BLDC drives. Moreover, it is source of information for identification of orientation of the rotor relative to the stator, start-up procedure and control algorithms. The literature analysis shows, that during development of control algorithms, the back electromotive is often assumed to be ideally shaped. This paper shows results of identification of electromotive force during normal and generator work for different angular speeds.

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Adam STECKIEWICZ, Bogusław BUTRYŁO

Kielce University of Technology

ANALYSIS OF MAGNETIC PROPERTIES OF THIN-LAYER MATERIALS WITH CONDUCTIVE PERIODIC STRUCTURE

Summary. The paper demonstrates the application of the finite-difference method combined with integral vector field formulation to calculate the magnetic field distribution in thin-film structures, which form nonhomogeneous layers of the laminar materials. An exemplar geometries of periodic elements were presented and solved both by the finite-element and finite-difference method, to estimate elements self-inductance. The accuracy of the proposed difference-integral 2D model in relation to differential 3D model were characterized. (Analysis of the magnetic properties of the thin-film materials with a conductive periodic structure).

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Katarzyna NOWAK, Kamil PADUSZYŃSKI

Kielce Univeristy of Technology

ANALYSIS OF FACTORS AND HAZARDS ASSOCIATED WITH ELECTRIC SHOCK

Summary. The paper presents systematized information concerning hazards related to electric shock sustained by living organisms. It includes the effects, thresholds and admissible values of individual hazards.

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Ovidiu IVANOV, Mihai GAVRILAS:

Gheorghe Asachi Technical University Iasi, Romania

Calin-Viorel SFINTES, Marian DUMITRACHE:

EFE Energy SRL, Buzau, Romania

A SOFTWARE TOOL FOR ELECTRICITY MARKET TRADE PRICE ANALYSIS

Summary. --- .

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Nicusor Constantin TOMA

Delgaz Grid S.A. Târgu Mureş, Romania

Mihai GAVRILAS, Bogdan Constantin NEAGU

Gheorghe Asachi Technical University Iasi, Romania

APPLICATION OF SMART METERING SYSTEMS FOR ENERGY LOSSES ASSESSMENT AND FORECASTING IN DISTRIBUTION SYSTEMS

Summary. --- .

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Krzysztof SZTYMELSKI

Politechnika Śląska, Gliwice

A SIMILAR COMPARISON WITH SIMULATIONS ACTUAL PV ON-GRID INSTALLATIONS WITH A POWER OF 2 KW

Summary. Within the framework of this article, electricity production in an actual photovoltaic system with photovoltaic panels power of 2 kW has been analyzed. The considered installation has been working on-grid for over two years. The overall cost of creating the installation has been compared to the prosumer savings of electricity consumption as well as to the current and future situation concerning the reception of unused prosumer power by electricity suppliers. The gains of the actual system have been compared to an online simulator.

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Rafał SETLAK

Politechnika Śląska, Gliwice

BATTERY CAPACITY SELECTING ALGORITHM FOR STATIONARY ENERGY STORAGE SYSTEM

Summary.&nbspThe article presents a problem solution of selecting the capacity of batteries for stationary energy storage in the own needs supply systems (SZPW). The new algorithm has been implemented in a company that uses simplified methods of capacity selection, which used only: rated voltage, discharge time, continuous load current, immediate load current. The new algorithm additionally uses functions: capacity from temperature, capacity from discharge current, lifetime from discharge depth. The algorithm also calculates the LCOE index. Comparison of the old method of capacity selection with the new algorithm saved in the form of a calculation program showed that for the same input data for calculations, the traditional method overestimated the capacity of the energy storage system. This resulted in increased investment costs.

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Marcin FICE

Politechnika Śląska, Gliwice

ANALYSIS AND PARAMETRIC DISCRIPTION OF ELECTRIC LOADS ACTIVE POWER PROFILES

Summary. The article concerns the parametric description of active power profiles of households which can be included to the virtual power plant or DSR services (demand side response). Electric energy management at the consumers from the housing segment requires a database of load devices energetic characteristics. The large number of electric household equipment and their energy parameters makes it practically impossible to log and use all active power profiles for energy management in virtual power plant. The parametric description of profiles limits the size of a database but at the same time causes the mapping accuracy is reduced. Considering the low power and energy control potential in a single household in relation to the total demand in a virtual power plant, the accuracy achieved is sufficient.

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Kamil MIŚLIWIEC, Bożena WIECZOREK

Politechnika Śląska, Gliwice

GRAPH COLOURING ALGORITHMS

Summary. The main aim of the study was to examine four algorithms concerning the graph colouring problem, respectively: LF (Largest First), SFL (Saturated Largest First), genetic algorithm, both sequential and multithreaded. Additionally, an application in a web browser environment was created to 3D visualisation of the graph colouring process allowing adjustment of graph parameters (such as number of vertices and graph density) and observation of the obtained results (execution time and number of colours).

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Norbert LITWIŃCZUK, Maciej SADOWSKI

Politechnika Białostocka

SOFTWARE FOR ANALYSIS AND PRESENTATION OF THE RESONANCE AMPLIFIER DYNAMIC CHARACTERISTIC

Summary. The paper presents AMPLAM software created at the Bialystok University of Technology, supporting the analysis of the resonant power amplifier. AMPLAM allows to determinate dynamic characteristics of the power amplifier and selected energy parameters. Dynamic characteristic is one of the most important device’s characteristic and describe the behavior of the device under operating conditions. Her knowledge allows to quickly specify the class and work’s regime and values of output voltage and current. The AMPLAM program was created in the Matlab, but as core for nonlinear analysis the Ansoft Seranade software was used.

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