# 2018 20th International Symposium on Electrical Apparatus and Technologies (SIELA)

## Filter Results

Displaying Results 1 - 100 of 127
• ### [Front cover]

Publication Year: 2018, Page(s): 1
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Publication Year: 2018, Page(s): 1
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Publication Year: 2018, Page(s):1 - 9
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• ### Autor index

Publication Year: 2018, Page(s):1 - 2
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• ### Analytical Comparison of Bluetooth Low Energy Beacons

Publication Year: 2018, Page(s):1 - 4
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Present paper discusses the Bluetooth Low Energy (BLE) beacons comparison process. Approximately 85 devices were compared by different parameters given by manufacturers. There is comparison of transmission power, expected life in years and calculated average energy consumption. The most commonly used Systems on Chips (SoC) and batteries are shown. Misleading points are also discussed. Analytical c... View full abstract»

• ### Assessment of the Influence of Magnetron Sputtered Coatings on the Electrodynamic Forces of Current-Carrying Busbars

Publication Year: 2018, Page(s):1 - 4
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In current-carrying parts of electrical apparatus, under certain conditions, large currents are transferred, which also define large electrodynamic forces striving to distort the current contours. The most severe is the short-circuit regime where the electrodynamic forces are proportional to the square of the short-circuit breaking current. As a result of their action the temperature of the elemen... View full abstract»

• ### Assessment of the Influence of the Technological Parameters on the Magnitude of the Electrical Contact Resistance of Current-Carrying Busbars with Magnetron Sputtered Thin Coatings

Publication Year: 2018, Page(s):1 - 4
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In many cases, operating conditions for low and medium voltage busbars are characterized by extreme electrical, cyclic and temperature loads and the presence of chemically active environment. The requirements for busbar materials are increased due to high loads and high operating temperatures. The use of a suitable coating and a method for its application can significantly increase the durability ... View full abstract»

• ### Modelling and Research of High-Efficiency Converter for Energy Storage Systems

Publication Year: 2018, Page(s):1 - 4
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The following paperwork considers modelling and examination of a high-efficiency converter for charging applications in energy storage systems. The converter provides galvanic isolation between the charged storage elements and the supplying DC bus. The high efficiency is due to the circuit soft-switching operation, as well as, to the implementation of a synchronous rectifier as an output stage. Ch... View full abstract»

• ### Energy Management Algorithm for Peak Demand Reduction

Publication Year: 2018, Page(s):1 - 4
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Peak demand is an important issue for power systems. Because, marginal cost of supply might increase due to the continuous increase in peak demand. Besides, peak demand might give rise to the power outages. The residential sector is one of the most important sectors affecting the peak demand. Along with the continuous increase in residential loads, peak demand causes adverse effects to the stabili... View full abstract»

• ### An Examination of the Effects of Distributed Generation on Distribution Systems by Load Flow Analysis

Publication Year: 2018, Page(s):1 - 6
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Nowadays, obtaining electrical energy from renewable energy resources has become an important issue, mainly because the increasing demand for electrical energy from fossil sources leads to environmental problems and rapid depletion of these sources. Rapidly developing technology makes efficient production of electrical energy from renewable sources possible, so these sources have become appealing ... View full abstract»

• ### Sentinel-1 SAR Images of Inland Waterways Traffic

Publication Year: 2018, Page(s):1 - 4
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The present paper contains information on radar observation of Danube river by using satellite-based Sentinel-1 Synthetic Aperture Radar (SAR) and incoherent pulse radar installed on the Bulgarian bank near city of Ruse. Radar pictures from both sources are presented in the paper. Distance and azimuth resolutions of both radars are examined as well as the quality of pictures with respect to target... View full abstract»

• ### Non - contact selection of power from eleclric transmission lines

Publication Year: 2018, Page(s):1 - 4
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Power supply devices for monitoring systems, light fencing, relay protection and emergency automatics of high voltage air electric networks, in particular, a capacitive power take-off from a high-voltage three-phase power transmission line placed a safe distance along the line wires, and an antenna connected to an electromagnetic device are considered. The results of the analysis show a sufficient... View full abstract»

• ### Application of the drive systems through the stepper motors in the process equipment, manipulators and pushers without feedback

Publication Year: 2018, Page(s):1 - 4
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The current trend in the development of electric drive systems is the replacement of mechanical transmissions and kinematic connections by electric ones, that is, the fusion of an electric motor with a working element (actuating element). The main advantage of a stepper motor is the ability to realize precise positioning and speed control without applying feedback (speed, position). The limitation... View full abstract»

• ### Survey on Regenerative Energy Potential of Athens Trolleybuses

Publication Year: 2018, Page(s):1 - 4
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Inverter-Fed asynchronous machines are widely used in high power electric vehicles, such as electric trains and trolleybuses. The use of vector control in those public transportation systems has gained popularity due to its advantages in terms of energy conversion, reliability and quality of transportation. In addition, recent advances in operation and control of regenerative braking schemes give ... View full abstract»

• ### Soft Starter Circuit Design for Single Phase Squirrel Cage Induction Motor

Publication Year: 2018, Page(s):1 - 4
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Single phase squirrel cage induction motor (SPIM) is widely used in both domestic and industrial applications because of its rough and simple structure. Different kinds of applications bring different optimal operating condition requirements. Starting of the single phase motor with the direct-line connection causes high starting current, high torque ripple in many applications. Because of these dr... View full abstract»

• ### Generalized Net Model of Biometric Identification Process

Publication Year: 2018, Page(s):1 - 4
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In the current paper a generalized net model of the biometric identification is presented. The modeled process contains combination of the steps included in unimodal, multibiometric and hybrid identification systems. The constructed generalized net model can be used for analyzing and simulating the processes included in biometric identification systems. It can be helpful in procedures of managing ... View full abstract»

• ### Obtaining Resonance Frequency and Corresponding Circuit Parameters in an Induction Heating System

Publication Year: 2018, Page(s):1 - 4
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The high efficiency of the systems based on induction heating can be achieved if resonant frequency is provided. In the present paper, an approach employing the finite element method is proposed for determination of the main parameters of LC circuit, necessary to reach the resonance frequency. View full abstract»

• ### Experimental study of the influence of operation of the twelve-pulse transformer with bridge rectifiers of the harmonic composition on the primary current

Publication Year: 2018, Page(s):1 - 3
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In this work, the influence of the operation of a twelve-pulse transformer with bridge rectifiers on the harmonic composition of the primary current is analysed, comparison of obtained and theoretical. View full abstract»

• ### Thermoelectric Generator Power Prediction Based on Artificial Neural Network

Publication Year: 2018, Page(s):1 - 4
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Thermoelectric generators are devices making use of the effect of Seebeck. They directly convert the temperature difference$\pmb{\Delta T}$to electric power. The present paper offers a neural network for the prediction of the voltage generated by a Seebeck module at various temperature differences. For this purpose, real experimental results were used. View full abstract»

• ### Corner 2D Capacitance

Publication Year: 2018, Page(s):1 - 5
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The 2D geometric corner permeance (capacitance or conductance) was introduced for easier accurate calculation of magnetic and electric circuits containing regions with strong non uniform field. For infinitely long both arms of the corner and for infinitely long one arm and zero length of the other one, exact formulas for geometric corner permeance were derived and for short one arm and the length ... View full abstract»

• ### Study of Two MPPT Methods for High Inertia Wind Turbine with Direct Driven PMSG

Publication Year: 2018, Page(s):1 - 4
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The aim of this work is to study and compare two methods for maximum power point tracking (MPPT) for megawatt wind energy conversion systems. The performance of the optimal tip speed ratio control (TSR) and the optimal torque control (OTC) is analyzed using Matlab/Simulink model of a wind turbine with direct driven permanent magnet synchronous generator (PMSG) connected to the grid via full scale ... View full abstract»

• ### Comparison of Wind Data Measurment Results of LIDAR Device and Calibrated Cup Anemometers Mounted on a Met Mast

Publication Year: 2018, Page(s):1 - 4
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In this paper measurement results of a LIDAR device are compared to those from calibrated cup anemometers mounted on a met mast. The correlations of wind speeds give very good results at all evaluated heights. View full abstract»

• ### Steady state transient response evaluation of a first order dynamic circuit on a ground of short series experimental data

Publication Year: 2018, Page(s):1 - 5
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In the paper an approach is proposed for transient process study in a first order (R-C type) dynamic circuit. By processing only a short series of experimental data obtained it is shown how the steady state response can be evaluated. This way it becomes possible substantially to decrease the experiment labor. A specific application of Least Squares Method (LSM) for the processed data series is des... View full abstract»

• ### Investigation and Evaluation of Coupling Effect of BPL Transmission Units in MV Cable Network

Publication Year: 2018, Page(s):1 - 4
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The article discusses the basic principles of BPL-PLC transmission paying attention to the limitations of its efficiency in medium voltage cable networks. A way of performing appropriate tests concerning the effectiveness of using the right way of the modem coupling with the cable line has been described. Based on the results obtained, respective practical conclusions have been formulated. View full abstract»

• ### Induction heat treatment of steel products with group work of static frequency converters

Publication Year: 2018, Page(s):1 - 4
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Effective numerical models of induction heat treatment with group work of static frequency converters are developed. They include two-dimensional modeling of coupling electromagnetic and temperature fields in cylindrical systems for processing of tubes and rolls and connecting them with models of inverters. Also thermal tension during heating and cooling of tubes and rolls are simulated. These dat... View full abstract»

• ### Risk Management in the Field Electrostatic Charge

Publication Year: 2018, Page(s):1 - 4
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In order to determine the amount of electrostatic charge and its impact on technological processes and people, the following risk management is proposed. Risk assessment includes tests of the electrostatic charge with the measurement of the electrostatic field and conductor continuity, processing data obtained by measuring, and ultimately analyzing the obtained results as well as suggestions for r... View full abstract»

• ### Implementation of a DC current sensing transformer with H-bridge MOSFET rectifier in a resonant LLC converter

Publication Year: 2018, Page(s):1 - 4
| | PDF (1973 KB) | HTML

This paper presents experimental implementation and tests the efficacy of a current feedback circuit for an LLC resonant convertor, working as a battery charger. The circuit is based on a current transformer and a second H-bridge which is synchronised with the first side H-bridge of the converter. The proposed solution, along with all mandatory requirements such as galvanic isolation, stability, f... View full abstract»

• ### Simulation Model of Unsymmetrically - Shaped Grounding Grids for Investigation of the Touch Voltages during Lightning Stroke

Publication Year: 2018, Page(s):1 - 4
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Lightning activity is a natural hazard. Protection of equipment and people in electrical power systems depends on the effectiveness of the earthing (grounding) and lightning protection systems. Modeling of the earthing systems of electrical power substations is within the scope of the authors' research work. They have developed a computer model based on Matlab. The purpose is to be obtained the po... View full abstract»

Publication Year: 2018, Page(s):1 - 4
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Business continuity and availability are top priority for IT. Providing sustainable availability, confidentiality and integrity of all services and resources within associates and counterparts is a key concept to be in the “Leaders” quadrant. Conventionally system updates are being underestimated, delayed or forcefully applied lacking any prior research, analysis nor testing. This paper would glan... View full abstract»

• ### Plug and Play System for Monitoring of Electrical and Non-Electrical Data

Publication Year: 2018, Page(s):1 - 5
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With the arrival of Industry 4.0 in the industry, it is necessary to integrate it into the ship's monitoring and automation systems. Digital information management in shipping is an inevitable and necessary trend. Compared with the traditional management mode, it is more convenient, efficient and traceable. The most effective data management and maintenance platforms currently are cloud-based tech... View full abstract»

• ### Using a Long Time Constant Integrator in Rainfall Intensity Measuring via Acoustic Method

Publication Year: 2018, Page(s):1 - 4
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In the present article is proposed a simplified approach for determining the rain intensity, based on acoustic method. A piezo plate is used as a probe, and a long time constant voltage integrator and comparator circuits are the major blocks of the developed sensor. As a reference, a weighing method, based on a strain gauge is used. The main blocks of the sensor are described, and a series of real... View full abstract»

• ### Phase Shift Tuning for Measurement of Hysteresis Losses in Inductors with Magnetic Core

Publication Year: 2018, Page(s):1 - 4
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The study presents a method for tuning the phase-shift during measurement of hysteresis losses. It allows to make sure that the two voltages, representing the magnetic field B and the field intensity H, are in-phase, in order to correctly obtain the losses in the magnetic core. For this reason the phase shift is estimated for the fundamental component. With the use of two carefully sized low-pass ... View full abstract»

• ### Development of the Mathematical Model for the Calculation of Electrical Characteristics of Induction Crucible Furnace of Conductive with Ferromagnetic Tygle with Two-Layer Loading

Publication Year: 2018, Page(s):1 - 4
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$\mathbf{A}$mathematical model is developed for the electric calculation of induction crucible furnaces with a conductive crucible in the ELCUT package. Electrical and power characteristics of the furnace were obtained depending on the frequency, temperature and current of the inductor. The calculated values were verified experimentally. View full abstract»

• ### Induction crucible furnace with reactive power nonsymmetrical compensation of inductor sections

Publication Year: 2018, Page(s):1 - 4
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The article deals with the design and power scheme of an induction crucible furnace with a capacity of 10 tons for steel from a dual frequency converter. A comparison of dynamics of the melt homogenization process in furnace of the proposed design with a similar process in a conventional furnace is compared. Calculations showed that at the same power, the speed of metal movement in the bath increa... View full abstract»

• ### RF Performance Analysis of Carbon-Based Interconnects

Publication Year: 2018, Page(s):1 - 4
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In this paper performance analysis of the carbon-based interconnects in the radio frequency (RF) range is made using parameterized SPICE computer models. Frequency dependent parameterized RLC models of a multilayer GNR interconnect and a CNT interconnect are created, as well as an accurate computer interconnect model based on two-port representation. Based on the obtained resistance values for CNT... View full abstract»

• ### Log-normal shadowing model for outdoor propagation between sensor nodes

Publication Year: 2018, Page(s):1 - 4
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Here we present outdoor propagation of wireless sensor nodes in different scenarios. “Log-normal shadowing model” is used here for predicting large-scale coverage for wireless sensor networks. Applying this model we can estimate the energy capacity of WSN (wireless sensor network), before such systems to be deployed. View full abstract»

• ### E-Bayesian Point Estimation and Comparative Analysis of the Operational Reliability Related to Electronic Items for Medical Purpose

Publication Year: 2018, Page(s):1 - 4
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This paper is focused on the medical items reliability analysis and comparison of the evaluated reliability indices per three types of measuring items containing electronic and mechanical modules. The analysis is based on the study of exponential model parameters by means of reliability parametric E-Bayesian estimation. The point estimation values of operational reliability indices valid for the m... View full abstract»

• ### Single-phase Two-rotor Axial Generator with Rotating Permanent Magnets in the Stator

Publication Year: 2018, Page(s):1 - 4
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Programming simulations by means of the finite element method Femm 4.2 and experimental studies of two especially crafted single-phase two-rotor axial generators with and without rotating magnets in their stator windings have been carried out. The obtained models simulate the operation of the studied generators with good precision. The change in the construction, namely, the addition of rotating m... View full abstract»

• ### Study of Three-Phase Axial Flux Generators

Publication Year: 2018, Page(s):1 - 4
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Programming simulations by the finite element method Femm 4.2 have been made along with experimental studies of three types of especially crafted three-phase axial flux generators with rare-earth magnets. The e.m.f. and the full active power have been both calculated and measured for the three types of generators. The obtained models simulate with good precision the operation of the studied genera... View full abstract»

• ### Automated system for measurement of natural lighting and utilization of the results for lighting control

Publication Year: 2018, Page(s):1 - 3
Cited by:  Papers (1)
| | PDF (2835 KB) | HTML

In the recent years the idea of human centric lighting is gaining popularity. This idea is based on the non-visual effect that light have on people, which can adjust their daily rhythms and improve their motivation, well-being and productivity. The simplest way of achieving human centric lighting is by maximum use of the natural daylight. Except for the positive influence of the daylight on people... View full abstract»

• ### Providing Medical Apparatus with a High Reliability at the Design Stage

Publication Year: 2018, Page(s):1 - 4
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This article suggests a practical approach to the number of backup elements optimization within electronic devices, regarding which high level of reliability requirements have been set. The approach suggested is especially suitable for application in medical electronic devices for mobile use, when there are some additional important factors such as volume and weight. An approach is established by ... View full abstract»

• ### Investigation of Sensors for Use in the Management System of Earthmoving and Construction Machines

Publication Year: 2018, Page(s):1 - 4
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The paper describes sensors of various types for use in the operation control system of earthmoving and construction machines. As a result of the research authors found out that the most rational for earthmoving and construction machines is the use of potentiometric sensors. View full abstract»

• ### Assessment of the Critical Clearing Time in Low Rotational Inertia Power Systems

Publication Year: 2018, Page(s):1 - 4
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The growing share of power electronic/converter interfaced generation is decreasing the total system rotational inertia. The reduced rotational inertia in the power system has important impact on the electro-mechanical processes, the power angle and frequency evolution time are quicker resulting in faster transient processes. Rapid response of the protection systems shall be applied, in order to c... View full abstract»

• ### Optimization of Lighting Distribution in Road Lighting Luminaire

Publication Year: 2018, Page(s):1 - 4
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An approach for optimal design of light distribution of road lighting lumrnaire with LEDs as light source is introduced. The highest possible average illuminance is obtained with a given set of LEDs by varying the orientation of each elementary light source. The way of overcoming the large scale problem is described in details as well as some practical considerations for constructing such kind of ... View full abstract»

• ### Design Consideration of Induction Brazing Systems

Publication Year: 2018, Page(s):1 - 4
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The process of induction brazing is a dedicated application of the induction heating which requires special attention during the estimation and design of the systems used to apply it. This comes from the specific requirements defined by the materials properties used and by the needs of specific temperature profile required during the process. In this paper we will review the key moments during des... View full abstract»

• ### Evaluation and Verification of LLC Operating Regimes

Publication Year: 2018, Page(s):1 - 4
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The paper presents a study of the operating regimes of a LLC resonant converter using mathematical models and real hardware measurements for verification. The various operation waveforms are taken with varying the load, thus changing the output parameters (current, voltage and power) of the converter. The parameters of the circuit elements that are loaded in the model are the same as of the evalua... View full abstract»

• ### Distributed Environment for Model-Based Design of Power Electronic Devices

Publication Year: 2018, Page(s):1 - 4
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The work presents a distributed environment for model-based design of power electronic devices. It is based on the use of an information model of the devices. The goal is to use a model-based design to create a flexible distributed system with minimization of the hardware resources used. With using an information models, software systems are being integrated and used in different scientific fields... View full abstract»

• ### Experimental and Numerical Studies of the Heating in a Low Voltage Switchboard

Publication Year: 2018, Page(s):1 - 4
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The paper presents both a numerical and an experimental study of the heating in a closed low voltage switchboard (LVS). Experimental installation is developed for testing the heating in a LVS with a possibility for real time computer aided measuring of the temperature. A computer model has been developed in Comsol for conducting the numerical part of the study. The obtained experimental results an... View full abstract»

• ### Influence of the Current-Carrying Elements Material on the Thermal Field Distribution in a Low Voltage Switchboard

Publication Year: 2018, Page(s):1 - 4
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The paper presents numerical studies of the influence exerted by the material of the current-carrying elements in a low voltage switchboard (LVS) on the level of heating in it. The studies have been conducted by means of especially developed computer models of the LVS in Comsol. The tests have been carried out both for a closed switchboard and a switchboard with ventilation openings in case of nat... View full abstract»

• ### Influence of the Heating on the Force of a Solenoid Actuator with T-Shaped Armature

Publication Year: 2018, Page(s):1 - 4
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The study carried out in the paper is connected with electromagnetic actuator having T-shaped moving part. Results from both numerical and experimental studies of the way the winding heating influences the magneto-motive and the electromotive force are given. The numerical data are obtained with the help of a 3D computer model. The optimum current load on the winding is defined, at which maximum e... View full abstract»

• ### Digital Model of a Document in a University Document Repository

Publication Year: 2018, Page(s):1 - 4
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The building of a centralized university document repository is a challenge posed by multiple factors - heterogeneous processes and procedures where users and applications with different rights create and use diverse documents. The article presents a model of a document in a digital repository. It supports heterogeneous metadata that facilitates the search for and use of documents by users and ext... View full abstract»

• ### Architecture of Mobile Online: an Application for Creating Mobile Versions of Web Pages

Publication Year: 2018, Page(s):1 - 4
| | PDF (745 KB) | HTML

Much of the web pages don't have mobile versions. This is a problem for users who access them via mobile devices. Mobile Online is an application that automatically creates mobile versions of web pages. The article presents the application architecture and describes the main components and the application work process. View full abstract»

• ### Generalized Net Model for Building Responsive Design of Web Pages

Publication Year: 2018, Page(s):1 - 4
| | PDF (460 KB) | HTML

The task of automated creation of mobile versions of websites that do not have responsive design becomes more and more popular. The article presents a generalized net model for building mobile content. The model was successfully used in the Mobile Online app. It can be implemented in mobile browsers and software tools to generate real-time mobile web page design. View full abstract»

• ### DC-link voltage Control for a Three-Phase Active Infeed Converter with Power Decoupling Circuit

Publication Year: 2018, Page(s):1 - 4
| | PDF (766 KB) | HTML

Reducing the DC-link capacitance of a voltage source converter (VSC) by means of an active power decoupling circuit - also known as power pulsation buffer (PPB) - affects the structure of the voltage control loop. In this paper a three-phase two-level IGBT converter in conjunction with a shunt type PPB based on a bidirectional SiC buck/boost converter is investigated. Measured DC-load current and ... View full abstract»

• ### Cubature Kalman Filter-Based Speed Sensorless Control of Induction Machines

Publication Year: 2018, Page(s):1 - 4
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In this paper, a new speed sensorless control algorithm is introduced for induction machine (IM) drives, which utilizes the cubature Kalman filter (CKF) as state estimator. The CKF is a relative new approach to nonlinear state estimation, which uses a spherical-radial cubature rule in order to compute numerically the multivariate moment integrals. Using an augmented state space model of the IMs, C... View full abstract»

• ### Experimental results on the use of flux concentrators in an IPT system

Publication Year: 2018, Page(s):1 - 4
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The paper presents a critical evaluation of different approaches for designing the magnetic system of an inductive WPT (IPT). The common question that need to be addressed, early on, from the designer is will there be any benefits when the magnetic system includes a flux concentrator. This paper considers a FEA of a magnetic design with or without flux concentrators. The self-inductance is kept th... View full abstract»

• ### Fractional activation functions in feedforward artificial neural networks

Publication Year: 2018, Page(s):1 - 4
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Fractional calculus is an important tool for analysis, including physics, biology and artificial intelligence. For some functions, alternative fractional definitions have been developed - the exponential function, trigonometric functions, hyperbolic tangent. But for others, like the logistic sigmoid function, fractional equivalents are not yet studied. Most of the mentioned functions are used as a... View full abstract»

• ### Parameterized Study of High-Frequency Welding System

Publication Year: 2018, Page(s):1 - 6
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The paper deals with parameterized modeling of processes in an induction heating system for high frequency longitudinal pipe welding. The investigation has been carried out in order to estimate factors influencing the welding process, required energy and system efficiency. Time harmonic electromagnetic and transient thermal fields have been studied and distribution of the magnetic flux density, ed... View full abstract»

• ### Lighting Energy Savings through Implementation of Lighting Control System Based on Evolutionary optimisation Algorithm

Publication Year: 2018, Page(s):1 - 3
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Technologies nowadays are developing in a fast pace. A lot of complicated lighting control systems are developed, but still they are not welcomed by the occupants in public premises. Most of the efficient lighting control strategies are also very expensive and are not cost effective. The current paper presents an analysis of the lighting energy savings accomplished in an office by implementation o... View full abstract»

• ### FPGA Based Neural Networks for Characters Recognition

Publication Year: 2018, Page(s):1 - 3
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The current paper presents an FPGA based artificial neural network (ANN) for character recognition. Implementation of the neural network in programmable logic brings a fast speed for character recognition that is difficult to be achieved with standard processor or DSP. The operation of the neural network is verified and tested using an FPGA device. View full abstract»

• ### Modelling of uninterruptible work cycle of controllable electric loads

Publication Year: 2018, Page(s):1 - 4
Cited by:  Papers (1)
| | PDF (2503 KB) | HTML

In this paper two approaches for the modeling of controllable loads operation are described. The uninterruptible working cycle of a controllable load imposes certain additional constraints. Such operation cycle is commonly modeled via additional artificial binary variables that further increase the complexity of the initial optimization problem. An approach for the reduction of these inconvenience... View full abstract»

• ### Cyber-Physical Power System of Micro Smart Grid on the base of transformer substation 7000kVA

Publication Year: 2018, Page(s):1 - 4
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Interactive cyber-physical power system with information about the state of protective equipment of smart transformer substation 10/0,4 7000 kVA is discussed. This transformer substation is a part of distribution network of MPEI. Realized system corresponds online internet monitoring of electric energy of object, similarly system of electric supply of the main the television and radio complexes of... View full abstract»

• ### Vibration and collision detection technique

Publication Year: 2018, Page(s):1 - 4
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The present paper addresses a novel approach in solution of the issues related with monitoring of impact and vibrations on the surface of sensitive equipment. The aim is to establish the presence of kinematic changes in the contours of a monitored object caused by the contact with another mass body as well as establishment of the magnitude and the mass of the influence. It is based on frequency do... View full abstract»

• ### Bidirectional DAB DC-DC Converter with Predictive Hysteresis Current Mode Control

Publication Year: 2018, Page(s):1 - 4
| | PDF (1784 KB) | HTML

A simulation model that realize hysteresis current mode control (without current comparators) for Bidirectional Dual Active Bridge (BDAB), called Predictive Hysteresis Current Mode Control (PHCMC), is proposed in the present paper. Buck and Boost modes of operation are developed in the MATLAB/SIMULINK environment. 3D finite element analysis has been employed for modelling the electromagnetic field... View full abstract»

• ### Improvement in Characteristics of Linear Generators for Wave Energy Power Plants

Publication Year: 2018, Page(s):1 - 5
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This paper presents a novel topology of linear electrical generators with permanent magnets for a wave energy plant. A comparison of existing and proposed topologies is done. The analysis is based on the static 3-D magnetic field modelling and dynamic simulation using equivalent circuits. The results show that the proposed topology has higher power per mass of the magnetic system. View full abstract»

• ### Electromagnetic Analysis of HTS Generator with Bulk Superconductor

Publication Year: 2018, Page(s):1 - 4
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This paper presents an electromagnetic analysis of electric generator with bulk high temperature superconductor (HTS) taking into account nonlinear properties of HTS. Calculation includes the process of HTS bulks magnetization inside the inductor, which is needed to create the superconducting rotor with trapped magnetic field. Performance of generator with HTS bulks is analyzed using calculated di... View full abstract»

• ### Parallel Simulations in the Static Multiphysics Analysis of RF - MEMS Switches

Publication Year: 2018, Page(s):1 - 4
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The main objective of this paper is to develop a parallel algorithm aiming to reduce the computational time required to solve coupled multiphysics problems that arise in the RF -MEMS switches elasto-static analysis so that their consequent model order reduction can be carried out more efficiently. View full abstract»

• ### Polar to Cartesian Interpolation Algorithm

Publication Year: 2018, Page(s):1 - 4
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The registration of the ISAR (Inverse Synthetic Aperture Radar) signal in a two-dimensional (2D) polar grid and its interpolation to Cartesian coordinates is a problem while for image reconstruction a fast Fourier transform (FFT) is required. Normally, this ISAR problem is not considered due to short length of the synthetic aperture and comparably small sizes of the targets. The present work is in... View full abstract»

• ### Evaluation and analysis of fog dispersion under the influence of an electric field

Publication Year: 2018, Page(s):1 - 4
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In this work, the steam droplets dispersion was evaluated under the influence of an alternating current field through a flyback transformer in an experimental fog chamber. The main objective is to design a high voltage and frequency transformer to disperse fog in the environment. The dispersion was evaluated through reliability levels by using t-distribution for 3 optical sensors inside the chambe... View full abstract»

• ### Fault-tolerance of a Laboratory Computer Cluster

Publication Year: 2018, Page(s):1 - 4
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This paper discusses the research on fault-tolerance of a laboratory computer cluster, which is designed and built by lecturers and students in the courses of Computer Architectures and Fault-tolerant Computer Systems in Burgas Free University. The cluster consists of four single-board computers Raspberry Pi 3, and is used for research on its fault-tolerance in condition of degradation and reconfi... View full abstract»

• ### An Approach to the Electrical Sizing of The Electric Motorcycle Drive

Publication Year: 2018, Page(s):1 - 4
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Motor vehicles driven on electricity are rapidly gaining ground in practice. For the urbanized environment, electric motorcycles are especially suitable. The reliability, range and speed of the motorcycle depend on the correct choice of the type, power and torque of the electric motor. The load on the electric motor is the highest at the start. There are a number of approaches to electrical sizing... View full abstract»

• ### Eddy current losses in permanent magnets of a coaxial magnetic gear

Publication Year: 2018, Page(s):1 - 3
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In the present work, eddy current losses in permanent magnets of a coaxial magnetic gear construction are estimated. Transient finite element method model is implemented for eddy currents calculation in dynamic operational mode. Simulations in different rotational speeds are performed and results for the eddy currents demagnetization effect over the torque conversion are presented. View full abstract»

• ### Distributed Internet of Things System for Wireless Monitoring of Electrical Grids

Publication Year: 2018, Page(s):1 - 3
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In this work a distributed internet of things system for electric power consumption monitoring, has been designed. LoRa radio frequency technology is employed with LoRaWAn communication protocol. The system consists of Arduino based distributed measurement devices connected by gateway stations which are transferring data to online cloud server for further processing and visualization on distant po... View full abstract»

• ### Seismic Analysis of High Voltage Bushing

Publication Year: 2018, Page(s):1 - 4
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In this work a numerical seismic analysis of high voltage transformer bushing for 245kV voltage is performed. We developed an approach combining three types of finite element method modal analyses: random vibration, response spectrum and harmonic response. Ansys-Workbench software is used for the finite element modeling. Results for material deformation, local acceleration and vibration spectra ar... View full abstract»

• ### Design of Saturable Choke for Reduction of IGBT Turn-on Losses

Publication Year: 2018, Page(s):1 - 4
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The aim of this paper is to present a design methodology for dimensioning a saturable choke with flat “F” characteristic of the soft magnetic material, which is connected in series with the IGBT, to reduce the dynamic turn-on losses at switching mode of the transistor. View full abstract»

• ### Home automation system based on ESP8266

Publication Year: 2018, Page(s):1 - 4
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This paper describes the implementation of an Internet of Things Home Automation System with energy measurement capabilities. The basic hardware components are the ESP8266 micro-controller by Espressif and energy meter chip HLW8012 by HLW Technology. The Software works over the TCP/IP stack and uses the MQTT protocol to communicate between the devices. The minimum configuration of the HAS includes... View full abstract»

• ### Humidity Sensors Based on Doped Titania-Silica Surface Layers

Publication Year: 2018, Page(s):1 - 4
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The paper proposes humidity sensors on the base of Ti-Si-Ce-Zn-Cu-O surface layers, developed using a sol-gel technology and a thermal treatment at 400°C or 800°C. Titanium (IV) n-butoxide and polydimethylsiloxane have been used as titania and silica precursors. Cerium is included in the resulting system via a saturated liquid solution of diammonium hexanitrocerate in isobutanol. It provides suffi... View full abstract»

• ### Tuning of power system stabilizer PSS3B and analysis of its properties

Publication Year: 2018, Page(s):1 - 5
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The purpose of the power system stabilizers (PSS) is to provide additional damping to the interarea, local and intrastation modes of electromechanical oscillations and thus to improve the small-signal stability of the electric power systems. There are a number of PSS types, standardized by IEEE. The most widely used and commented in the literature stabilizer types are the dual-input, single band P... View full abstract»

• ### Economic Assessment of Lithium-Ion Battery Storage Systems in the Nearly Zero Energy Building Environment

Publication Year: 2018, Page(s):1 - 6
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Scope of this paper is to deliver a complete techno-economic model for the economic assessment of lithium-ion battery energy storage systems in the framework of the nearly zero energy buildings (NZEB). The proposed model simulates the combined operation of photovoltaics, solar thermal generators, heat pump generators, electrical and thermal storage devices in order to represent efficiently the typ... View full abstract»

• ### Generalized Net Model of Virtual Collaboration Space

Publication Year: 2018, Page(s):1 - 4
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As a discrete tool for universal description of adaptable, flexible, structured and reusable models of complex systems, generalized nets have been applied to modeling of various practical aspects of education and scientific research. Here, in continuation of previous research in this area, generalized nets (GN) have been used for development of a model of the process of personalization and adaptiv... View full abstract»

• ### Arc-Flash Risk Level Calculations based on Computer Simulations and Measures to Avoid Hazards

Publication Year: 2018, Page(s):1 - 4
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Safety of the electricity distribution personnel during maintenance, repair, test, and measurement in the distribution areas is in the thread of the energy of the electric arcs due to potential short circuit faults. Unfortunately, every year people are injured, burned or killed because of these accidents. In parallel with population increase at metropolitan cities, short circuit levels of the powe... View full abstract»

• ### Exploration of the Electric Processes in Discrete Alternating Step-Voltage Regulators

Publication Year: 2018, Page(s):1 - 4
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The paper presents a review on the problems of the analysis of autotransformer discrete alternating voltage regulators. The analysis has been made basically by the state variables approach in the time domain, where the non-linearity of the regulator components has been considered. A special algorithm has been developed for part-by-part solving of the obtained sparse matrix equations with cell stru... View full abstract»

• ### Hierarchical Method of Self Clustering Algorithm Using Self Organizing Map Neural Network

Publication Year: 2018, Page(s):1 - 4
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This paper describes an approach of self clustering algorithm using hierarchical Self Organizing Map neural network. In the basic SOM algorithm the user should enter the number of clusters before its training, here we give different approach of representing only the data set and the network should create clusters according to the data topology. In order to do it there are several steps that have t... View full abstract»

• ### Lighting control system for public premises, based on evolutionary optimization algorithm

Publication Year: 2018, Page(s):1 - 3
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Energy efficiency together with user satisfaction are the two major considerations in the contemporary lighting systems. Satisfying these considerations is only possible through lighting control. The current paper presents a lighting control system which operation is based on genetic algorithm optimization. The objective of the optimization task is the maximum use of the natural daylight, thus mak... View full abstract»

• ### Researching the characteristics of the magnetoelectric position sensor for automotive application

Publication Year: 2018, Page(s):1 - 6
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The paper is devoted to the study of magnetoelectric crankshaft position sensor based on magnetostrictive-piezoelectric layered material of macro fiber composite - Metglas composition. The main advantages of such a sensor are smaller size and weight. Macro fiber composite active length was of 40 mm, active width was of 5 mm; Metglas length was of 40 mm, the width was of 7 mm; the thickness of magn... View full abstract»

• ### Hybrid design of magnetoelectric position sensor with CAN compatibility

Publication Year: 2018, Page(s):1 - 4
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The paper is devoted to the study of magnetoelectric crankshaft position sensor with signal processing based on symmetrical magnetostrictive-piezoelectric layered structure, material of piezoceramic PZT - Metglas composition. Proposed sensor would have the advantages against the traditional sensors such as smaller size and weight. Piezoceramic composite in our case had length of 70 mm, width of 12... View full abstract»

• ### Adaptive Velocity Control for a Differential Drive Mobile Robot

Publication Year: 2018, Page(s):1 - 4
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This paper proposes an adaptive velocity controller for a differential drive mobile robot during path following applications. First, a dynamic model including actuator dynamics with respect to the robot linear and angular velocities is derived. The controller is designed using model-reference adaptive control method in order to compensate for the uncertainties in the dynamic parameters of the robo... View full abstract»

• ### Vision-Based Position Regulation of Differential-Drive Mobile Robots

Publication Year: 2018, Page(s):1 - 4
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This paper considers the problem of vision-based stabilization (a stopping maneuver) of nonholonomic differential-drive mobile robots. First, a camera-robot model suitable for control applications is developed. Using a look-ahead approach, a vision-based feedback controller is proposed, which stabilizes the robot at a desired position indicated by a static circular marker on the line to follow. An... View full abstract»

• ### Application of the Fuzzy Logic for Information Analysis in Communication Networks and Systems for Power Utility Automation

Publication Year: 2018, Page(s):1 - 4
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This paper presents an opportunity for application of the Fuzzy Logic for analysis of the information flows from the Supervisory control and data acquisition (SCADA) systems, which support the operation of power system facilities (power plants, power substations). The paper provides an example and formulates the practical problem related the information analysis. A solution based on the applicatio... View full abstract»

• ### An Approach to Choosing an Optimal IT Infrastructure in Accordance with an Assignor's Requirements

Publication Year: 2018, Page(s):1 - 4
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This paper presents the author's approach to choosing the optimal IT infrastructure based on an assignor's requirements. An essential part of the approach is the design of a highly reliable data center for the purposes of a micro, small or medium enterprise. The approach is adapted for practical application. Software tools for its application have been developed. View full abstract»

• ### Estimation of Series Resistance of Transformer Winding to Study Transient Phenomena

Publication Year: 2018, Page(s):1 - 4
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Exact determination of frequency and amplitude of resonance points in the frequency response is very important for fast transient analysis of a transformer winding. The accuracy of series resistance has significant role to determine the weakening of oscillations in a winding of a transformer. In this paper a novel method is used for estimation of series resistance in detailed model of transformer ... View full abstract»

• ### Assessment of non-stationary harmonic distortion related to adjustable speed induction motor and soft starters

Publication Year: 2018, Page(s):1 - 4
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Time-varying harmonic distortion of induction motor soft-starter was exemplarily assessed by most common signal processing techniques like Short-time Fourier Transform, Wavelet Packet Transform and Kalman Filtering. Furthermore the resonance phenomena are considered that appear the grids with power factor correction supplying induction motors with soft-starters. View full abstract»

• ### A Nothing on Insulator - NOI - Nanotransistor Configuration Suitable for the Zaidman Model

Publication Year: 2018, Page(s):1 - 4
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This paper presents an alternative configuration of an atypical Silicon On Insulator (SOI) device with a vacuum cavity. In order to simulate carriers transport in vacuum electronic devices, the Silvaco tools recommend Zaidman model. In previous studies we obtained a null drain current through a Nothing On Insulator (NOI) transistor, if Zaidman model is adopted. The reasons come from the model cond... View full abstract»

• ### Nano-Core-Shell Technologies Suitable for Thin Film Transistors Implementation

Publication Year: 2018, Page(s):1 - 4
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This paper presents a novel type of technology involved in the Thin Film Transistors (TFT) fabrication, using ferrite-Nano-Core-Shell-multilayer (NCS) materials. In a first stage, the applied technology of the nanomaterial synthesis is depicted. Primary core-shell np's ferrite nano-particles (Fe304) is processed by self-assembling of an external shell with organic compound (PABA - para-aminobenzoi... View full abstract»

• ### Microcontroller Based Implementation of Peak Current Control Method in a Bidirectional Buck-Boost DC-DC Converter

Publication Year: 2018, Page(s):1 - 4
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This work presents the digital implementation of peak current control method in a bidirectional buck-boost DC-DC converter, as an alternative solution to voltage and hysteresis mode control schemes. The advantages of peak current control, such as the constant switching frequency and good performance in both steady state and dynamic response are pointed out. Moreover, an implementation scheme is pr... View full abstract»

• ### Convergence of Technologies of the Evolving Prototype of an Energy Efficient Large-Scale System

Publication Year: 2018, Page(s):1 - 4
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Topical issues of the energy efficiency of advanced technology, elements of ultra-large-scale systems and its evolving prototypes are discussed. We consider system integration as a process. A conceptual model of technology for energy efficient large-scale system based on bioinspired approach are shown. An intention of “windows of possibilities” is determined for exploratory research and developmen... View full abstract»

• ### Investigation of the Stratified Model of Virtual Semantic Environment for Modifiable Vehicesl

Publication Year: 2018, Page(s):1 - 4
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In this paper we discuss the diversified approaches in the design of elements stratified models of modifiable vehicles. Principals of designing and developing, multi-aspect modeling of infrastructure solutions at energy landscape and identikit of modifiable vehicles are considered. In the beginning, a brief review of the two levels of a virtual semantic environment is given. Obviously, the propose... View full abstract»

• ### Transformation of NMEA ship network from sensor-based to information-based model

Publication Year: 2018, Page(s):1 - 4
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The considered approach puts users at the center and subordinates the construction of the system to their needs and it will greatly increase the ability to provide information to users in the desired kind and place, together with a full report of their actions, which can help in future analysis and improving their performance. A major advantage of the transition to the specified architecture is th... View full abstract»

• ### Impact Assessment of Frequency Support by Electric Vehicles: Great Britain Scenario 2025

Publication Year: 2018, Page(s):1 - 4
Cited by:  Papers (1)
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A desire to reduce environmental pollution coupled with advances in battery technology are some of the drivers for the massive growth in the use of Electric Vehicles (EVs) worldwide. The objective of this paper is to assess the impact that large groups of EVs, connected to frequency-responsive charging stations, have on the frequency response of the Great Britain (GB) power system during a sudden ... View full abstract»

• ### Probabilistic Assessment of Enhanced Frequency Response Services Using Real Frequency Time Series

Publication Year: 2018, Page(s):1 - 4
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This paper presents a probabilistic assessment of the novel enhanced frequency response (EFR) service in the transmission system of Great Britain (GB). Real frequency measurements with one-second resolution, released by National Grid (NG) corresponding to the years 2014 and 2015, are used for the performance assessment. Initially, the frequency quality is evaluated against Security and Quality of ... View full abstract»