bluuebunny/crossref_metadata_2025_split huggingface dataset:
Autonomic energy supply of distributed/isolated villages in Russia by using combination of LNG/CNG/LPG/diesel and renewable energy
Authors: Karasevich V , Li V , Kashlaev R , Fedyukhin A 
Published: November 2019

Abstract
This article is dedicated to search of right balance for heat and power supply of distributed villages in different conditions in Russia. Russia has a huge territory that is not connected to power grids, many villages aren’t connected to natural gas network and don’t have district heating systems. Approach consists of several steps. On the first step we choose isolated areas and villages that have no chances to get connection to natural gas grid. Even if they are connected to power grids, they still have a room for autonomic solutions in producing heat/hot water. In many cases quality of power is not very good. Then on the second step we compare different combinations of traditional (LNG/CNG/LPG/diesel) and renewable (PV panels, solar collectors, wind turbines + heat/power storage units) power sources in order to find the best way of power/heat supply for the village. In the article the approach is shown on two different examples – Dagestan (south of Russia) and Yakutia (north of Russia). Article also covers some ways and proposals of renewable energy supporting considering current situation in this industry.
Passive harmonic filters for high voltage transmission systems
Authors: Dovgun V , Egorov D , Boyarskaya N , Novikov V , Prozorov N 
Published: November 2019

Abstract
This paper presents a new passive filter configurations that can reduce the harmonic penetration into high-voltage transmission system. Proposed configurations utilize the secondary winding of a step-down transformer as a part of the filter. A general method for harmonic filters design, based on the theory of passive circuit synthesis, is considered. The simulation results show that the proposed filter is an efficient tool for attenuating harmonics penetrating high voltage transmission systems.
The use of GA in the problems of circuit-mode optimization of electrical networks
Authors: Stsepuro K I , Bodrenkov E A 
Published: November 2019

AbstractA method for determining the optimal state of the electrical network according to the criterion of minimum active losses using a genetic algorithm is presented. The algorithm is implemented in the programming language Visual Basic. The advantages of the proposed approach in comparison with the brute force are the reduced brute force required to determine the optimal scheme, the flexibility of setting the user controlled values. The practical significance lies in the possibility of implementing the approach of a distribution grid company and solving optimization problems in a timely manner. The algorithm was tested on 10-35 kV electrical network diagrams.
The question of specific features of overvoltages when switching parallel-connected vacuum breakers
Authors: Belsky R , Skornyakov V , Savelieva I 
Published: November 2019

Abstract
The paper presents the results of analyzing switching overvoltages occurring with simultaneous shedding of active inductive load by vacuum breakers jointly connected to one bus. It is established that with the available spread in current choppings of vacuum breakers, the maximum overvoltage occurs on the contacts of a vacuum breaker out of the number of parallel connected ones, in which the gap is de-ionized last. It is recommended to damp any occurring overvoltages by arresters located in parallel to separate groups of breakers connected to one bus.
The application of mathematical simulation for solution of linear algebraic and ordinary differential equations in electrical engineering
Authors: Bebikhov Yu V , Semenov A S , Yakushev I A , Kugusheva N N , Pavlova S N , Glazun M A 
Published: November 2019

Abstract
The application of mathematical simulation for the solution of linear algebraic and ordinary differential equations regarding to complex electrical circuits, systems of automatic control and regulation is discussed in the paper. MatLab software package of mathematical simulation and one of its built-in environments - Simulink were chosen to be used in the experiment. MatLab is the most commonly used application in engineering practice in comparison with the other similar programs and it has proved to be reliable for technical calculations. The calculation methods of complex electrical circuits by the solution of linear algebraic and differential equation systems were developed and tested. The equations of electric equilibrium were written for each element of an electric circuit on the basis of Ohm’s and Kirchhoff’s laws. The example of the calculation of branches currents and nodal potentials of electric circuit by the matrix method in MatLab was presented. The approximated polynomial function was calculated and its graph was plotted applying the developed technique. Thus, the coincidence with the original data was proved. The calculation of differential equations of successively connected inductive and resistive elements of electric circuit was made in Simulink environment. Finally, the dependences of voltage and current on time were found using the direct Laplace transformation. The graphs were plotted due to the application of the oscilloscope built into the program. It has been concluded that the application of mathematical simulation for engineering calculations in order to solve the problems of automatic control and power engineering is the most suitable and universal technique.
Liquid-phase synthesis, surface morphology and properties of the electrode materials based on MnO2 for electrochemical devices
Authors: Ivanova A G , Masalovich M S , Zagrebelnyy O A , Shilova O A , Yu Kruchinina I 
Published: November 2019

Abstract
The article focuses on the problems of development of electrochemical devices. The effect of a synthesis method and fabrication technology on the electrochemical performance of a MnO2-based electrode is discussed.
Determining of the characteristics of nonlinear resistive-capacitive and resistive-inductive elements
Authors: Selitrenikov D A , Bodrenkov E A 
Published: November 2019

Abstract
We present a method for finding the dependency of resistance and inductance on the current for the series connection of resistive and inductive nonlinear elements and finding the dependency of resistance and capacitance on the applied voltage for the parallel connection of resistive and capacitive nonlinear elements at a constant frequency. The initial data are current and voltage oscillograms measured for different moments of time. Examples of determination of the specified dependencies are given, estimates of the absolute and relative error of the approach are given.
Numerical simulation of high power RF–RF hybrid plasma torch
Authors: Frolov V , Ivanov D , Sosnin V 
Published: November 2019

Abstract
In this paper the possibility of operation of a high-power RF-RF hybrid plasma torch for materials processing is shown with help of numerical simulation. That kind of plasma torch consists of two coaxial ICP/RF torches connected in series. A mathematical model is presented which includes assumptions, basic equations, a computational domain with main sizes. The results of the calculation i.e. the temperature distributions inside the plasma torch for two modes of operation are shown. In the first mode the power is fed only to the first plasma torch (P
1=40 kW, P
2=0), in the second mode the both parts of the RF-RF hybrid plasma torch (P1 = 40 kW, P2 = 600 kW) operate. The obtained results can serve as a basis for further analysis of the operation of a high-power RF-RF hybrid plasma torch.
Assessment of the influence of interference on the sliding mode observer
Authors: Zhiligotov R , Davydov V 
Published: November 2019

Abstract
The article presents the results of studying the effect of interference on the sliding mode observer. The effect of interference in the lines feeding the engine is evaluated. The measured interference is present in the current signal. The operation of a sliding observer of the position and speed of the rotor of a permanent magnet synchronous motor is described. This observer is used as part of a sensorless vector drive control system. The presented version of the motor state observer is implemented by creating a model in the Matlab Simulink software package and tested on the bench using a 200W motor. The aim of the work is to develop an observer who is resistant to drive parameter changes.
Numerical simulation of the outdoor insulator breakdown
Authors: Murashov Iu , Safonov E , Markelov V 
Published: November 2019

Abstract
The article is devoted to the development of a mathematical model of an insulator breakdown and the methodology for assessing the development of a breakdown. The main calculation expressions are presented in the article. The design of a real insulator (the outdoor voltage insulator of 35 kV type IOSK 3/35 UHL1) is presented as an example of the technique applicability. The datasheet of this outdoor isolator was used to verify the mathematical model and the results of numerical simulation. The results of numerical simulation and the outdoor insulator breakdown voltage are presented in the article. Numerical simulation was carried out in Comsol Multiphysics software. The obtained results can be applied in the engineering design of outdoor insulators and elements of electrical constructions.
Development of digital twin of high frequency generator with self-excitation in Simulink
Authors: Murashov Iu , Zverev S , Smorodinov V , Grachev S 
Published: November 2019

Abstract
The article presents the numerical simulation results of the high frequency generator (electron tube type) with self-excitation in the Simulink. The main structural element of this generator is an electron tube GU-66A. Digitization characteristics of the electron tube is made. A mathematical model of the HF generator, taking into account the anode and grid characteristics of GU-66A according to the passport data of the product, has been developed. The parameters of the HF generator circuit are determined. A plasma-chemical reactor and its equivalent electrical parameters (set in a wide range of accepted values) are used as a load oscillation circuit. The developed model allows to determine the optimal parameters of the HF generator, as well as to predict operating modes, providing continuous supply of HF power for a long time (more than 20 hours). The equivalent electrical parameters of the plasma-chemical reactor are designed to ignite plasma discharges in argon and gas mixtures based on argon at atmospheric pressure.
Mathematical model of solid-liquid phase transitions applied to thermal energy accumulators
Authors: Yu Zakharova V , Kuznetsov P A , Baranenko A V 
Published: November 2019

Abstract
The paper presents a mathematical model for the numerical calculation of the heat flow and the volumetric fraction of the liquid phase of phase change materials (PCM) in containers of thermal energy accumulators of spherical and cylindrical shape, used in air conditioning and ventilation systems. The comparison of the calculated and experimental values for n-octadecane showed good convergence of the results. When using in geometry optimization algorithms of containers and when choosing PCM, the model has an advantage due to the high speed of calculations on it.
Assessment of energy efficiency of channel with nozzles
Authors: Dudarovskaya O 
Published: November 2019

Abstract
An algorithm for calculating the energy coefficient has been obtained, which makes it possible to estimate the efficiency of channel with various heat exchange intensifiers in the form of chaotic nozzle elements. The numerical study results are presented in the form of relationship between the energy coefficient Ed and the Reynolds number Ree. This made it possible to assess these heat exchange intensifiers from the point of view of energy efficiency and to determine the most optimal ones.
A new approach to overcome the imbalance in three-phase systems using the new proposed fractional-polynomial functions
Authors: Sy V Q 
Published: November 2019

Abstract
Non-linear or unbalanced loads, etc., are the typical causes of asymmetry in the three-phase systems. The typical difficulty that exists in many methods of symmetrisation is the calculation of the adjusted values (regulable parameter). In this paper, we propose a new method to overcome all of the above problems, which includes: introduction of the new dependence of the basic electrical quantities (voltages and currents) on the controllable values of the static compensation devices; the proposed new method of overcoming the asymmetric operation regime in the three-phase systems, in which we aim to reduce the number of compensating devices.
Current collector optimizer topology to improve maximum power from PV array under partial shading conditions
Authors: Refaat A , Osman M H 
Published: November 2019

Abstract
The power generated from photovoltaic (PV) series-parallel (SP) array topology is greatly harmed by partial shading phenomenon. Power losses due to shadow may reach up to 30% of total power expected, depending on PV array topology and climate conditions. This paper presents a current collector optimizer (CCO) topology to enhance the power harvest from the PV array under partial shading conditions. A comparative study is carried out using MATLAB/Simulink in order to illustrate the effectiveness of the proposed topology. According to results, the global maximum power generated by CCO topology is substantially increased compared to traditional SP array topology, while the mismatch power losses are significantly reduced during different shading patterns.
Innovative local heat supply stations for industrial buildings
Authors: Volkov V D , Sergeev V A , Shelyakin V P , Sitnikov N V , Goremykin S A , Mamontov D A 
Published: November 2019

Abstract
Energy saving effect in heating systems of industrial buildings without 24-hour supervision is reached using the automatic heat management systems. Our paper offers a specific scheme for the automation of a local heat supply station (LHS) with an autonomous heat accumulator and a dual-circuit coolant circuit. The proposed technical solutions can only be effective if the compliance of the thermal resistance of the external enclosing structures of the building to the established requirements is observed.
Process equipment pump-controlled hydraulic drive: improving energy efficiency
Authors: Kozhukhova A V , Sakharova O N , Dmitrieva I A 
Published: November 2019

Abstract
The paper addresses the issues of stepless speed control of the hydraulic drive output link by means of frequency control, throttle control and pump-throttle control; they are compared, and their applicability in various types of hydraulic drives is analyzed [1, p.619]; a mathematical model of losses arising in a volumetric rotary hydraulic machine with volumetric (pumping) control and frequency management is given; a mathematical model is formed on the basis of which the dynamic characteristics of removable hydraulic drive with frequency control with varying parameters of external load and operating factors will be studied. The paper is based on theoretical research of the frequency-controlled hydraulic drive that was carried out [2, p.41]. As a result of the research, a schematic solution and a mathematical model of the developed hydraulic drive have been proposed. The main structural and technical and economic indicators are: a change in the angular velocity of the rotor of the machine in a given range, and an increase in the energy efficiency of the drive.
Improving the efficiency of combined-cycle plant by cooling incoming air using absorption refrigerating machine
Authors: Mendeleev D I , Maryin G E , Akhmetshin A R 
Published: November 2019

Abstract
The purpose of the paper is to study and analyze the possibility of increasing the power of combined cycle gas turbine (CCGT) unit during the period of positive ambient temperatures. The other aim is to study usage of an absorption refrigerating machine in a CCGT cycle to increase its energy efficiency. The third aim is to analyze the operation of 110 MW combined-cycle power unit at various ambient temperatures, and to obtain alterations in the main CCGT characteristics when the ambient temperature changes. Calculations of the thermal scheme of a gas turbine were carried out using mathematical modeling, the steam turbine was calculated basing on the guidelines. The possibility of increasing the capacity of a CCP-110 MW was studied and analyzed. The conducted studies allowed us to conclude that the use of absorption refrigerating machine in the cycle of a combined-cycle plant can improve the efficiency of the unit, increase profits from power generation, and reduce penalties for non-compliance with the load schedule.
Empirical performance modelling of a lithium-ion battery of a solar car
Authors: Kasatkin I , Egorov M , Zakhlebaev E , Kotov E , Selin I , Kukolev M 
Published: November 2019

Abstract
The aim of the work is to ascertain a solar car battery performance. The student engineering team of Peter the Great Petersburg Polytechnic University designs the car. Parameters as terminal voltage, operating current, power losses and efficiency are determined depending on battery state of charge (SOC) and operating power. For electrochemical transient modelling, an equivalent RC-circuit is included based on Thevenin battery model. It is assumed in the model that internal resistance, open circuit voltage and the RC-circuit voltage drop depends only on the SOC. Experimental data was obtained from the LG INR18650 MJ1 battery discharge curves. Modelling was performed for SOC values in the range of 0.17 to 0.95 since the terminal voltage dependence on SOC is nearly linear there. The proposed model is sufficient for state of charge estimating and battery performance determination.
Utilization of electrochemical energy storage devices in autonomous power supply systems
Authors: Fedotov A , Misbakhov R , Chernova N , Bakhteev K 
Published: November 2019

Abstract
Diesel and gas piston power units are used as a source of electrical power in autonomous power supply systems. For diesel power plants located in remote areas, the main component of the costs are the cost of imported fuel. For gas piston power plants operating on associated gas, the main problem is to ensure the stabilization of the frequency of alternating current with sudden load changes. The use of electrochemical electricity storage devices as part of power plants largely solves these problems. The article considers the choice of storage capacity for fuel economy, reduction the installed capacity of a power plant and frequency stabilization in the power supply system. It is shown that for diesel power plants, the use of electrochemical accumulators leads to both fuel savings and a decrease in its nominal capacity. For gas piston units, where the specific increase in fuel decreases with increasing load, the use of electrochemical accumulators reduces the installed power, but increases fuel consumption. The accumulator parameters for gas piston units are determined by the allowable overload/discharge of the load, and according to the energy intensity, they are determined by the duration of the maximum load, which is smoothed by the drive operation. We present numerical examples for estimating fuel consumption taking into account the efficiency in the charge-discharge processes of storage batteries. The simulation models show the impact of the electrochemical storage device on the stabilization of the frequency of an autonomous electric power supply system.
Roadmap for intelligent energy systems
Authors: Vasilev Valeriy V 
Published: November 2019

Abstract
The article is devoted to the prospects for the development of the energy complex of the Russian Federation within the framework of the concept “Industry 4.0”, the problems of integration of electricity, heat, cold and gas supply systems and energy security issues. A comparative analysis of the state and prospects of development of the fuel and energy complex of various regions of the world is given, and a forecast of the demand for integrated intelligent energy system is given.
Application prospects for vector time maps of cognitive images links
Authors: Pustovoy E A , Pustovaya O A 
Published: November 2019

Abstract
Neural networks have a great advantage in the analysis of implicit dependencies, big data analysis, image recognition and other recognition systems. However, they do not perform the function of memorizing information in an explicit form, they cannot logically think like a person. Neural networks are not managed repositories of information about cognitive images. They are quite difficult to edit or create new structures based on existing trained models. They do not have the necessary flexibility and scalability in the process of learning and in use. We propose to create vector-time communication maps of cognitive images links, containing functions for memorizing individual cognitive images and their links, with the possibility of forming explicit centers and with the possibility of scaling.
Digital diagnostic complex for power turbine units equipment
Authors: Murmanskii Ilia B , Aronson Konstantin E , Blinov Vitaly L , Zhelonkin Nikolay V , Murmansky Boris E 
Published: November 2019

Abstract
The study is devoted to the problem formulation for creation a concept of digital complex for power turbine equipment diagnostics using a reference turbine model formed by a set of computational models of thermal and gas-dynamic processes, by diagnostic expert systems (probabilistic type and decision tree type), by functional standard characteristics and statistical models. As part of the study it is proposed to develop diagnostic methods and algorithms for characteristic malfunctions causes for various subsystems of power equipment, which will allow them to be detected at an early stage and to prevent unplanned (emergency) equipment shutdown.
Fiber-optic sensors for monitoring the stress-strain state of construction objects
Authors: Badeeva E , Serebryakov D , Shachneva E , Badeev A , Murashkina T 
Published: November 2019

Abstract
For the timely detection of significant changes in the stress-strain state in the bearing elements of various building structures, which may lead to a deterioration of the technical condition of the object or transfer it to the emergency state, the use of fiber-optic sensors is proposed. The main advantageous characteristics of fiber-optic sensors, describing the promise of their application for practical applications, are disclosed. As a parameter recorded by the measuring transducer, the fiber-optic sensors use the intensity of the light wave. The mechanism of changing the optical intensity can be due to reflection, absorption, refraction of light rays passing through the measurement zone. The authors have developed a fiber optic attenuator type deformation sensor capable of controlling mechanical deformations of structural elements caused by disturbed internal geometric characteristics, destruction of structural integrity and negative influence of external weather conditions, seismic factors, temperature drops during operation. When developing the design of a fiber-optic sensor, the fundamentals of circuit design of measuring devices, methods of geometrical and fiber optics are used. As a basic measuring transducer, a fiber-optic microdisplacement transducer with a limiting attenuator is used, in which the intensity of the optical signal is modulated by changing the position of the attenuator placed in its path or increasing the optical power. A design-structural diagram of a fiber-optic micro-displacement measuring transducer and a block diagram and the design of a new sensor are presented. The principle of operation of an attenuator-type fiber-optic strain gauge is described.