http://energy.kpi.ua/issue/feed POWER ENGINEERING: economics, technique, ecology 2024-03-28T12:19:06+02:00 Zakladnyi Oleg zakladniy@gmail.com Open Journal Systems <p>The journal "POWER ENGINEERING: economics, technique, ecology" (Short title: Power Eng.: Econ., Tech., Ecol) is the scientific professional publication of Ukraine in the field of technical sciences. Scientific direction - energy and energy efficiency.</p> <p>Registration number of the certificate on the state registration of the printed mass media of КВ №22857-12775ПР dated 14.06.2017.</p> <p>Category of readers: scientists, specialists on the subject of the journal, postgraduate students, students.</p> <p>Frequency of release: 4 times a year.</p> <p>Year of foundation: 2000.</p> <p>ISSN: 1813-5420 (Print), 2308-7382 (Online).</p> <p>Founder National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute". It is published according to the decision of the Scientific Council of NTUU "KPI".</p> <p>Publisher National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute".</p> <p>Publication language: Ukrainian and English.</p> <p>Editor in chief Yu.I. Yakimenko</p> <p>The journal is included in the list of professional editions of Ukraine in which the results of dissertation papers for obtaining the scientific degrees of a doctor and a candidate of sciences may be published in accordance with the Resolution of the Presidium of the Higher Attestation Commission of Ukraine dated 24.09.2020. No. 1188.</p> <p>The journal is included in:</p> <p>- Databases "Scientific Periodicals of Ukraine" NBUV;</p> <p>- the Ukrainian abstract journal "Dzherelo" (IPRI NAS of Ukraine);</p> <p>- electronic archive of scientific and educational materials of NTUU "KPI" ELAKPI;</p> <p>- Scientific periodicals of Ukraine URAN (OJS);</p> <p>- Google Scholar Scientific Search Engine;</p> <p>- WorldCat, BASE, Polska Bibliografia Naukowa, Academic Keys.</p> http://energy.kpi.ua/article/view/300835 RISK ASSESSMENT FOR THE DEVELOPMENT OF THE EXEMPLIFIED TERRITORIES 2024-03-28T11:26:55+02:00 Natalia Remez mail@kpi.ua Vadym Bronytskyi mail@kpi.ua Tetiana Hrebeniuk mail@kpi.ua <p><em>The paper explores the risks associated with exempted and liberated territories that were previously used for certain industrial, commercial, agricultural or other activities. Such territories were captured or used by military forces during the war and then liberated or abandoned and left unattended, or were disturbed by natural disasters, man-made accidents, etc. The aim of the article is to analyze the possibility of their further use and rehabilitation.</em></p> <p><em>The following indicators of risk sources can be identified in such areas: presence of explosive objects; level of soil and water contamination; presence of chemical, biological or radiation contamination; degree of damage to infrastructure and building structures; risk of dangerous situations and accidents; impact on the health and safety of the local population; possibility of spreading infectious diseases; presence of unexploded or uncontrolled explosive materials; risk of re-invasion by enemy forces; potential environmental damage; and potential environmental impact. Based on the analysis of these indicators, they were summarized and grouped into six main risk indicators: demining of territories; efficiency of demining and disposal of remnants of military equipment, mines, etc.; safety and efficiency of demining and disposal technologies; degree of contamination of the demined territories after demining and disposal; level of safety assessment of the population living in these territories; return of vital infrastructure. An expert assessment methodology was applied, which includes an analysis of the severity of the consequences and the likelihood of their occurrence. The risks were ranked using the method of pairwise comparisons. The results of the study can be used to develop strategies for the further use and rehabilitation of the affected areas.</em></p> <p><em>The results of the study indicate the need for systematic monitoring and control of the exempted and liberated territories in order to prevent possible environmental and socio-economic problems. To ensure sustainable development and conservation of natural resources, due attention should be paid to the issues of environmental safety and rehabilitation of these territories. Further research in this area will allow developing more effective strategies for the use and rehabilitation of exempted areas, taking into account current environmental and socio-economic challenges.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Наталя Ремез, Вадим Броницький, Тетяна Гребенюк http://energy.kpi.ua/article/view/297581 FORMALIZATION OF THE PROCEDURE FOR ASSESSING THE ELECTRIC SUPPLY EFFICIENCY IN WORKSHOP NETWORKS OF INDUSTRIAL ENTERPRISES 2024-01-30T09:57:54+02:00 Vladimir Popov rector@zp.edu.ua Anatolii Zabolotnyi rector@zp.edu.ua Vera Dyachenko rector@zp.edu.ua Denys Fedosha rector@zp.edu.ua Valeriia Prykhno rector@zp.edu.ua <p><em>There is defined that the efficiency of workshop power supply networks largely determines the efficiency of the power supply system of the industrial enterprise as a whole and is determined by minimizing the reduced costs, which have two components: capital investments and the cost of electricity losses in workshop networks. Calculating the reduced costs during a technical and economic comparison of options is a labor-intensive task, since there is a large variability in the choice of circuit design, the choice of cross-sections of the conductors of the supply and distribution workshop network, as well as taking into account the design features of the workshop network.</em></p> <p><em>&nbsp;&nbsp; The analysis of the characteristics of the efficiency factors of workshop power supply was carried out. The basic components of the effective functioning of the workshoppower supply circuit are identified, namely: discreteness of electrical equipment; its placement in the workshop; operating modes of current-using equipment (CUE); loading schedule; ratio of the cost of electricity and the unit cost of workshop network elements.</em></p> <p><em>&nbsp;&nbsp; There has been determined that in any workshop power supply scheme, the duration of switching CUE on the electric power supply (CUE with a constant and variable operating mode), as well as the shape of the load schedule, largely determines the efficiency of its operation.</em></p> <p><em>&nbsp;&nbsp; Obtained results of a numerical experiment, when performing design of workshop networks in the DIPROPROM design institution (Zaporozhye), showed the effectiveness (3-7%) in determining the operational characteristics of workshop networks in comparison with existing engineering methods.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Володимир Попов, Анатолій Заболотний, Вера Дяченко, Денис Федоша, Валерія Прихно http://energy.kpi.ua/article/view/297583 ENSURING THE THREAD CAPACITY OF ELECTRICAL TRANSMISSION LINES UNDER THE CONDITIONS OF THEIR RESERVATION 2024-01-30T10:08:11+02:00 Anatoli Omelchuk mail@kpi.ua Volodymyr Zakolodyazhnyy mail@kpi.ua <p><em>A method of increasing the power transmission capacity in the post-emergency mode is considered, when a redundant line is connected to one of the working power transmission lines (LEP) with a voltage of 10 kV using the point of automatic switching on of the reserve (AVR). The effectiveness of such redundancy in most cases turns out to be low due to the limited capacity of trunk sections of mutually reserved lines with smaller cross-sections of wires at the end sections of these lines, which were built as radial lines. This leads to increased losses of active power and voltage, and, as a result, unacceptable deviation of voltage in remote load nodes of the redundant power transmission line. In order to improve the parameters of the operation mode of power transmission, it is proposed to use devices of longitudinal capacitive compensation and reactive power compensation in the scheme of the AVR point. An assessment of the effectiveness of the proposed measure was made.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Анатолій Омельчук, Володимир Заколодяжний http://energy.kpi.ua/article/view/297584 MODELING OF PROSUMER LOAD PROFILES BASED ON BEHAVIORAL APPROACH 2024-01-30T10:13:09+02:00 Oleksandr Kulapin omsroot@kpi.kharkov.ua Kostiantyn Makhotilo omsroot@kpi.kharkov.ua <p><em>The article analyzes various approaches to the modeling of daily electricity load schedules and proposes a methodology for improving the "bottom-up" behavioral model of the load of household consumers. The method is based on averaging generated random load schedules for a given type of household on a particular day of the year. Averaging is carried out by season and length of daylight. Next, working days and weekends are distinguished in each interval. Despite some differences, this work does not separate holidays, Saturdays, and Sundays to avoid unnecessary details. The selected parameters for dividing the averaging intervals allow you to obtain a relatively compact set of model data and, at the same time, preserve the features of the load on different days of the year and hours of the day. Household load profiles with varying steps of day distribution and the main difference of such distribution are considered. Models that more accurately convey the sporadic nature of prosumer consumption compared to typical load schedules are built for two types of households. A detailed analysis of the averaged load graphs was carried out in comparison with the typical graph and the generated load graphs. Averaged load schedules are suitable for modeling the operating modes and control algorithms of the prosumer energy generation and storage system.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Олександр Кулапін, Костянтин Махотіло http://energy.kpi.ua/article/view/297585 DEVELOPMENT OF DIGITAL SUBSTATION CONSTRUCTION TECHNOLOGIES. 2024-01-30T10:21:13+02:00 Tetiana Drubetska office@ust.edu.ua Denys Zemskyi office@ust.edu.ua V. Shmelova office@ust.edu.ua Viktor Artemchuk mail@znu.edu.ua <p><em>T</em><em>he development of technologies for the construction of digital substations</em><em> is discussed in the article. The construction of a digital substation provides the following advantages</em><em>. </em><em>There are </em><em>increasing the reliability of the equipment's functioning; reducing the costs of operating the equipment; increasing the efficiency of the use of the main equipment.</em></p> <p><em>Modern information technologies and innovative approaches to solving the tasks of automation and management of power facilities, which allow creating new type substations, have been studied.</em></p> <p><em>The principle of interaction of digital substation equipment is given.</em></p> <p><em>The differences between digital substations and analog substations are shown. The principle of operation of classical and digital substations is presented.</em></p> <p><em>The international experience of implementing digital substations is described.</em></p> <p><em>Digital substation is one of the basic technologies of Smart Grid. The basis of the construction of a digital substation is the replacement of numerous connections made by wires for the exchange of traditional analog and discrete signals with a unified exchange of digital messages, which provide the possibility of distributed implementation of the functions of the substation automation system and full functional compatibility of intelligent electronic devices of various manufacturers.</em></p> <p><em>The concept of "Intelligent" transformer is disclosed.</em></p> <p><em>A step-by-step transition to a digital substation is presented.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Тетяна Друбецька, Денис Земський, В. Шмельова, Віктор Артемчук http://energy.kpi.ua/article/view/297586 GUARANTEED ORIGIN OF ELECTRICITY IN THE LOCAL POWER SYSTEM WITH RENEWABLE ENERGY SOURCES 2024-01-30T10:33:57+02:00 Petro Lezhniuk vntu@vntu.edu.ua Vyacheslav Komar vntu@vntu.edu.ua Iryna Hunko vntu@vntu.edu.ua Kateryna Povstianko vntu@vntu.edu.ua <p><em>The article is focused on the development of a method for determining the part of electricity generated by renewable energy sources (RES) in the electricity flows in the branches of the electric grid. The method is based on a mathematical model of the electric grid, in which the coefficients of current distribution in the branches of the circuit from RES nodes and nodal voltages are used to determine the electricity flows in the branches of the electric grid. As a result, a matrix of power distribution coefficients of RES generation units to load nodes of the power grid is formed. This way, the component of the load power that depends on the power in the RES nodes is determined. The voltages used to form the RES power distribution matrix are determined based on the results of calculating the steady-state modes of the power grid or on the measurement data of the ACEMS.</em></p> <p><em>Since the forming of local electric power systems (LES) based on RES is actual, the article considers LES as a balancing group within the electric power system (EPS), which can operate as an autonomous system according to certain conditions. It is shown that for this purpose, a RES reservation system should be created in the power system due to their dependence on natural conditions and, accordingly, the instability of their electricity generation. When a transmission system operates as part of an EPS, a general system reserve is usually used (mainly maneuverable capacities of thermal and hydroelectric power plants). In order for the LES can operate as an autonomous one, it is proposed to use other means of power reserve available today: electrochemical energy storage, hydrogen and biogas technologies. An effective way is to coordinate the schedules of RES generation in the LES with the load schedules of active consumers.</em></p> <p><em>The example shows that in the case of a power deficit in the LES, RES located in the power grid can be used. The values of the necessary power at the LES connection node, power flows in the branches connecting the LES and RES grid, and power losses in them are determined by the offered method.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Петро Лежнюк, Вячеслав Комар, Ірина Гунько, Катерина Повстянко http://energy.kpi.ua/article/view/297525 IMPROVING THE QUALITY OF MAINTENANCE AND REPAIR OF TRACTION SUBSTATIONS EQUIPMENT 2024-01-29T11:56:40+02:00 Tetiana Drubetska office@ust.edu.ua E. Kozachenko office@ust.edu.ua D. Panasenko office@ust.edu.ua <p><em>The article deals with maintenance and repair of traction substations.</em></p> <p><em>The general problem of improving the maintenance and repair system of traction substations of electrified railways is described.</em></p> <p><em>An analysis of methods and means of maintenance and repair of substation equipment was carried out.</em></p> <p><em>The causes of malfunctions of the traction substations equipment are analyzed/</em></p> <p><em>The distribution of malfunctions of TP equipment by types of equipment was analyzed.</em></p> <p><em>The results of transformer inspections are presented.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Тетяна Друбецька, Є. Козаченко, Д. Панасенко http://energy.kpi.ua/article/view/298816 FEATURES OF CREATION OF THE SMART MONITORING SYSTEMS FOR MICROGRIDS 2024-02-21T10:40:11+02:00 Denys Derevianko mail@kpi.ua Oleкsandra Perehuda mail@kpi.ua <p><em>In this paper, an analysis of the main requirements for control systems in Microgrid is conducted. The main objectives of the implementation of Microgrid systems were determined and, based on the performed analysis, the requirements for Smart-monitoring systems were systematized. The components of Smart-monitoring systems, which include: communication software platform, hardware communication platform and types of equipment of DG sources for Microgrid systems were analyzed. It is proposed to build Smart-monitoring systems for Microgrid systems on the basis of the SGAM model, taking into account various models of aggregation of different types of DG sources within the framework of Microgrid systems. The proposed structure of the Smart-monitoring system for Microgrid systems with various DG sources makes it possible to effectively aggregate DG sources and prosumers and to carry out effective dispatching of generating capacities based on market mechanisms of their interaction with consumers and among themselves.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Денис Дерев'янко, Олександра Перегуда http://energy.kpi.ua/article/view/297574 SPEED CONTROL OF PERMANENT MAGNET SYNCHRONOUS MOTOR IN SLIDING MODE 2024-01-30T09:25:14+02:00 Mykola Ostroverkhov mail@kpi.ua Denys Kolomiichuk mail@kpi.ua Maksym Falchenko mail@kpi.ua Hryhorii Bolshakov mail@kpi.ua Heorhii Veshchykov mail@kpi.ua <p><em>The paper examines a series of speed control algorithms for a synchronous permanent magnet motor in sliding mode, providing asymptotic stability of the first, second, and third order. In the sliding mode, the control system exhibits properties that are unattainable with classical continuous control algorithms. The control algorithms are developed based on the inverse dynamics method combined with the minimization of local instantaneous energy functionals. The key idea of the method lies in the reversibility of the direct Lyapunov method for stability analysis. The closed-loop control system has a predefined Lyapunov function, represented by the instantaneous energy. Notably, the control algorithms do not require knowledge of the object's parameters or differentiation operations, which facilitates their practical implementation. The regulator parameters consist solely of coefficients used to specify the desired duration and shape of current and motor speed transient processes. The vector speed control system comprises two controllers for the stator current components and the motor speed controller. All regulators operate in sliding mode. The output signals of the stator current component controllers and speed vary discontinuously from maximum to minimum values. Simulation results demonstrate the effectiveness and high-quality performance of the control algorithms. To determine the control performance indicators for the three synthesized speed controllers, the motor startup trajectory is formed from characteristic segments of constant, linearly increasing, and parabolic signals. The speed control algorithm with a first-order asymptote ensures zero tracking error only for a constant reference signal. With a linearly increasing reference signal, the steady-state relative tracking error is 2,5 %, while for a parabolic reference signal, the error varies between zero and 2,5 %. The second-order asymptotic speed control algorithm ensures zero steady-state tracking error for constant and linearly increasing reference signals, and for a parabolic reference signal, the steady-state relative tracking error is 0,125 %. The third-order asymptotic speed control algorithm ensures zero steady-state tracking error for constant, linearly increasing, and parabolic reference signals, with a maximum dynamic relative tracking error of 0,05 %.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Микола Островерхов, Денис Коломійчук, Максим Фальченко, Григорій Большаков, Григорій Вещиков http://energy.kpi.ua/article/view/297576 MATHEMATICAL MODEL OF THE FREQUENCY CONVERTER SYSTEM OPERATION IN A SHIP'S AUTONOMOUS POWER SYSTEM 2024-01-30T09:40:02+02:00 Ihor Maslov dinuoma@onma.edu.ua Dmytro Kulagin rector@zp.edu.ua <p class="a" style="text-align: justify; text-indent: 1.0cm;"><em><span style="font-size: 10.0pt;" lang="UK">The article shows the process of building a model of the frequency converter control system for a ship's autonomous power system. This task was solved to simplify the mathematical description of the frequency converter for the ship's autonomous power system. As a result, a mathematical set of probable combinations of operating states of power switches and the corresponding values of generalised voltage vectors of the autonomous inverter using pulse width modulation were obtained. The modelling carried out on the basis of this data confirmed the correspondence of the obtained values of the phase voltage of the autonomous inverter to real energy processes. It is shown that it is important to further study the technical and methodological factors of increasing energy efficiency and the accuracy of the mathematical description of real links of power systems, which will ensure the process of a more qualitative study of energy processes in them.</span></em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Ігор Маслов, Дмитро Кулагін http://energy.kpi.ua/article/view/297579 ANALYSIS OF TOPOLOGY OF THE AUTOTRANSFORMER FORWARD-FLYBACK CONVERTER FOR PHOTOVOLTAIC PANEL 2024-01-30T09:46:30+02:00 Volodymyr Nerubatskyi info@kart.edu.ua Denys Hordiienko info@kart.edu.ua <p><em>Thе аnаlysіs оf cоnvеrtеrs cоntrоllіng оnly а pаrt оf thе оutput pоwеr іn phоtоvоltаіc systеms wаs cаrrіеd оut. Thе аrchіtеcturе оf dіstrіbutеd trаckіng оf thе mаxіmum pоwеr іs cоnsіdеrеd, whіch іs оnе оf thе mоst prоmіsіng sоlutіоns fоr оvеrcоmіng thе shоrtcоmіngs аssоcіаtеd wіth а dеcrеаsе іn thе еnеrgy еffіcіеncy оf phоtоvоltаіc pаnеls. Thе tоpоlоgy оf thе аutоtrаnsfоrmеr fоrwаrd-flybаck cоnvеrtеr fоr phоtоvоltаіc pаnеl іs gіvеn. Thе prіncіplе оf оpеrаtіоn оf thе cоnvеrtеr аnd thе flоw оf currеnt іn thе cіrcuіt durіng swіtchіng аrе prеsеntеd. Thе mеthоd оf cаlculаtіng thе оutput pоwеr оf thе cоnvеrtеr іn thе DMPPT аrchіtеcturе wіth а sеrіеs cоnnеctіоn, іn whіch thе cіrcuіt vоltаgе іs fіxеd by thе cеntrаl іnvеrtеr, dеpеnds оn thе gеnеrаtеd pоwеr оf thе phоtоvоltаіc pаnеls cоnnеctеd tо оnе cіrcuіt, іs оbtаіnеd. Thе pоwеr gеnеrаtеd by phоtоvоltаіc pаnеls wаs cаlculаtеd dеpеndіng оn thе stаtе оf thеіr shаdіng.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Володимир Нерубацький, Денис Гордієнко http://energy.kpi.ua/article/view/297587 COMPREHENSIVE CONDITION ANALYSIS AND PERSPECTIVES OF ENERGY DEVELOPMENT IN UKRAINE ACCORDING TO THE SMART GRID CONCEPT 2024-01-30T10:48:55+02:00 Yevhen Rudniev uni@snu.edu.ua Julia Romanchenko uni@snu.edu.ua <p><em>The article examines development trends of the energy complex of Ukraine, possibility and prospects of creating a modern energy complex through the use of an innovative technical base for energy management in accordance with the Smart Grid concept.</em> <em>The general properties of Smart Grid technology and its main advantages are given by authors. It is shown that within the framework of the Smart Grid concept, the intelligent electric power system is considered as a single network of information and control systems.</em> <em>The process of electric power industry modernization in the direction of the creation of "smart" power supply networks in a number of European countries, which aims to ensure stable development, economic growth, growth of living standards and protection of the natural environment, is considered.</em> <em>The paper describes modernization methods of the electric power complex of Ukraine based on foreign experience.</em> <em>It is shown that from the point of view of energy security and sustainable development, Smart Grid is able to ensure the operation of the power grid even in case of damage or destruction of one segment, which is a key advantage during post-war reconstruction.</em> <em>They will also make it possible to effectively integrate renewable generation and energy storage systems into the grid, as well as provide auxiliary services for forecasting the power system operation. The paper analyzes the problematic issues of implementing the Smart Grid concept in Ukraine.</em> <em>They include the lack of technological solutions and methods that provide an effective algorithm for determining the state of power networks cyber security; large length of power distribution networks and insufficiently developed infrastructure.</em> <em>A comparative description of the existing energy systems functional properties and energy systems based on the Smart Grid concept is presented in general.</em> <em>An analysis of possible ways of electric power industry development was carried out, which showed the presence of serious limitations of electric power industry development within the framework of the former concept, based mainly on the improvement of certain types of equipment and technologies.</em> <em>It is shown that Ukraine is at the initial familiarization and formation stage of the first organizational initiatives for Smart Grid, namely the implementation of the government-approved Concept of the "smart grids" introduction in Ukraine for the period up to 2035. The purpose and expected results of this Concept implementation are considered.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Євген Руднєв, Юлія Романченко http://energy.kpi.ua/article/view/297588 ANALYTICAL SOLUTION OF THE DIFFERENTIAL EQUATION OF HEAT CONDUCTIVITY FOR DAMAGED THERMAL INSULATION OF PIPELINES 2024-01-30T10:55:25+02:00 Anton Ganzha omsroot@kpi.kharkov.ua Viktoriia Kornelyuk omsroot@kpi.kharkov.ua Natalia Marchenko omsroot@kpi.kharkov.ua <p><em>For heat supply systems of Ukraine, the determination and forecasting of thermal energy losses during the transportation of heat carrier is an urgent problem. The thermal lines of the heating networks are long and its insulation is damaged. Installation of heat energy metering devices at all sources and all consumers (i.e. buildings) without exception allows determining and forecasting real heat losses in the heat network, but this is a difficult task, not all consumers and sources are actually covered by heat consumption accounting. The task of determining heat losses is also relevant for energy management systems of heat supply systems, energy companies and industry. The solution to the problem is proposed by a separate mathematical modeling of the temperature state of the section of the damaged insulating layer with the determination of the heat flow through it. It is proposed to solve the problem by the method of analytical solution of the differential equation of heat conduction with boundary conditions of the third kind. With the uniform distribution of characteristic damages along the total length of the pipeline, knowing the limits of damage influence, the share of insulation damage and the number of damages on the pipeline, it is possible to determine the real heat flow from the outer surface of the pipelines, including coefficient of increase of heat losses on the section of the heat pipe in relation to those determined by regulatory documents. Traditionally, one-dimensional models or determinations of the two-dimensional temperature field and actual heat fluxes in a cross-section to the axis of a characteristic damaged section of insulation are considered. But this does not take into account the two-dimensionality of the temperature field of the damaged layer of insulation along the length (that is, along the axis) of the pipeline. Therefore, the purpose of this work is to develop a methodology for determining heat losses through pipelines, taking into account the damage to their insulation and the distribution of characteristic damages along the length. The following simulation was carried out for one of the areas. Also, experimental and numerical studies using the finite difference method in combination with the method of running variable directions for similar models confirmed the coincidence of the analytical solution of the proposed model and the finite difference model within the permissible error.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Антон Ганжа, Вікторія Корнелюк, Наталія Марченко http://energy.kpi.ua/article/view/297589 ANALYSIS OF THE POTENTIAL AND PERSPECTIVES OF THE DEVELOPMENT OF BIOMASS TECHNOLOGIES IN UKRAINE 2024-01-30T11:04:02+02:00 Andrii Trachuk mail@kpi.ua <p><em>This article provides an in-depth analysis of the potential and prospects for the development of biomass technologies in Ukraine. An overview of the current state of biomass use in the energy, industrial and agricultural sectors of the country is being carried out. The article examines in detail different types of biomass such as wood, agricultural residues, biological waste, etc., and their potential for producing energy and other useful products. Particular attention is paid to technological innovations in the field of biomass processing, including processes of biogasification, pyrolysis and hydrothermal conversion. The authors analyze the ecological and economic aspects of using biomass as an energy source, considering its impact on reducing greenhouse gas emissions and ensuring the country's energy independence. In addition, the article examines important legislative and strategic initiatives aimed at supporting the development of biomass use in Ukraine, and puts forward proposals for further steps to stimulate this direction. In general, the article serves as a valuable source of information for scientists, experts and decision-makers interested in the development of sustainable energy and the use of renewable energy sources in Ukraine.</em></p> <p><em>Recommendations for the further development of the use of biomass in Ukraine are formulated, taking into account the importance of solving environmental problems and energy independence. Summarizing, the article not only offers an in-depth analysis of the potential and prospects for the development of biomass technologies, but also defines the ways for the practical realization of this potential in the conditions of modern energy and environmental challenges.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Андрій Трачук http://energy.kpi.ua/article/view/297508 ENERGY MANAGEMENT: NEW PRIORITIES OF THE 21ST CENTURY 2024-01-29T09:36:30+02:00 Oleksandr Kyrylenko ied1@ied.org.ua Serhii Denysiuk mail@kpi.ua Ihor Blinov mail@kpi.ua <p><em>The development of management methodology and the concept of energy management in modern conditions of transforming the energy sector by the requirements of the carbon-free economy are considered. New qualitative features and new areas of application of energy management and energy management systems (EMS) in the implementation of the energy transition and implementation of the Smart Grid concept have been revealed. It has been established that modern energy management is a proactive, organized, and systematic coordination of the purchase, transformation, distribution, and use of energy to meet requirements, taking into account environmental and economic goals. In contrast to the formation of the EMS according to the ISO 50000 series of standards, today the construction of the EMS is becoming more relevant, which provides systemic (complex) optimization of the parameters, structure, and modes of various technical objects according to a set of technical, economic and environmental criteria.</em></p> <p><em>It is shown that EMS is much more than a simple technical solution for monitoring the parameters and state of energy systems. With comprehensive forecasts of energy demand and supply, this system takes energy management to a completely new level, allowing operators of facilities (enterprises, buildings, and smart networks and systems) to determine the strategic direction of energy management, implement it, and achieve both energy efficiency and energy availability and environmental (social) acceptability. The components of EMS for Smart Grid are characterized, in particular: monitoring (actual energy production, actual energy demand, state of charge of energy storage, price uncertainty); forecast (energy production, energy demand, mobile data storage, uncertainty); power quality management (loss minimization, power quality indicators, and reliability/comfort); planning/dispatch/cost (operating costs, reduction of GHG emissions, profit maximization).</em></p> <p><em>It is proposed that a promising direction is to consider the SEM as a system of information and communication technologies, which at the system level is combined with power energy processes used by operators of electric power systems and networks to monitor, control, and optimize the productivity of production, transmission, and consumption of energy resources in systems of various hierarchical levels. level (as UES of Ukraine, regional and local systems, on specific energy facilities or individual energy technologies, etc.). Based on the analysis of prospective areas of application of EMS at energy sector facilities, modern areas of scientific and technical research in the construction of energy management systems for energy, electric power, and electrotechnical systems, which are practical to carry out in Ukraine, have been determined.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Олександр Кириленко, Сергій Денисюк, Ігор Блінов http://energy.kpi.ua/article/view/297512 REGIONAL ENERGY MANAGEMENT SYSTEMS BASED ON ESCOs: FEATURES OF CREATION AND APPLICATION 2024-01-29T09:51:15+02:00 Tetiana Yevtukhova info@ienergy.kiev.ua Yevgeniy Nikitin bor.ilienko@gmail.com Oleksandr Novoseltsev info@ienergy.kiev.ua Oleksandr Shemchuk regadm@adm-km.gov.ua <p><em>Excessive consumption and inefficient use of fuel and energy resources, unsatisfactorily high energy intensity of production of goods and services and their associated low competitiveness in domestic and foreign markets, in the context of a shortage of own energy resources and constant growth of prices for them, puts the problem of improving energy efficiency and energy saving of the regional and, as a result, national economy in the category of primary importance and relevance. The solution to this problem is achieved by creating a regional energy management system in regions (districts) on the platform of regional energy service companies, which allows, through a unified energy policy for the development and implementation of energy efficiency and energy saving projects in the region and the introduction of renewable energy sources, to more effectively address the problems of attracting foreign investment in the recovery and innovative development of the regional economy.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Тетяна Євтухова, Євгеній Нікітін, Олександр Новосельцев, Олександр Шемчук http://energy.kpi.ua/article/view/297520 TOPOLOGY OF EFFICIENT USE OF ENERGY BY A CHARGING STATION FOR ELECTRIC VEHICLES 2024-01-29T11:27:46+02:00 Volodymyr Nerubatskyi info@kart.edu.ua Denys Hordiienko info@kart.edu.ua <p><em>Рrеsеnts thе rеsults of thе rеsеarch of sеmіconductor convеrtеrs of chargіng statіons for еlеctrіc vеhіclеs basеd on lіthіum-іon cеlls. Basіc еnеrgy paramеtеrs and chargе-dіschargе charactеrіstіcs of lіthіum-іon and lіthіum-іron-phosphatе battеrіеs arе gіvеn. Thе topology of thе proposеd chargіng statіon for еlеctrіc vеhіclеs basеd on actіvе rеctіfіеr cіrcuіts іs prеsеntеd. Thе paramеtеrs of thе substіtutіon cіrcuіts thе battеry compartmеnt of thе Tеsla S еlеctrіc vеhіclе arе dеscrіbеd. Thе mеthod of fast battеry chargіng wіth constant voltagе and constant currеnt іs dеscrіbеd, whіch provіdеs a grеatеr numbеr of battеry chargе-dіschargе cyclеs. A sіmulatіon modеl of thе proposеd chargіng statіon structurе wіth an automatіc control systеm іs prеsеntеd. Thе еffіcіеncy of thе proposеd chargіng statіon systеm was calculatеd for dіffеrеnt paramеtеrs of thе chargе currеnt and swіtchіng frеquеncy.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Володимир Нерубацький, Денис Гордієнко http://energy.kpi.ua/article/view/297523 THERMODYNAMIC IMPERATIVES THE MODERNIZATION OF THE ELECTRIC DRIVE OF PUMP UNITS OF THE CENTRALIZED HEAT SUPPLY NETWORK IN THE CONTEXT OF INCREASEING ENERGY EFFICIENCY 2024-01-29T11:37:49+02:00 Michael Fedirko inter.office@wunu.edu.ua R. Holovko inter.office@wunu.edu.ua <p><em>The relationship between thermodynamic and hydraulic parameters of the heat supply network has been established. The dependence of the electric power consumed by the electric drive of the pump unit on the pressure and supply of the coolant was determined. It is proved that the regulated electric drive system has advantages over the non-regulated electric drive system in the context of energy efficiency of the pumping unit and the district heating network in general. Approaches and criteria for the synthesis of a regulated electric drive system, including its automatic control system, were determined, regulation methods were analyzed, and the most acceptable version of the electric drive was chosen: a controlled frequency converter - an asynchronous motor with a short-circuited rotor, taking into account the above, an energy-saving mechanical system of a centralized heat supply network was synthesized. The peculiarity of this system is that the protection of parameters of hydraulic and temperature regimes in the network of centralized heat supply is ensured with the help of extreme automatic control systems. At the same time, the assignment of mode parameters is provided by the temperature controller of the heat exchange point of the network. Regulation of the pressure and productivity of the pumping unit is carried out by changing, according to a certain law, the frequency and power supply of the asynchronous motor.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Михайло Федірко, Р. Головко http://energy.kpi.ua/article/view/297524 EFFICIENCY OF IMPLEMENTATION OF THE ENERGY MANAGEMENT SYSTEM AT 'RESEARCH AND PRODUCTION COMPANY 'ZOND' LTD 2024-01-29T11:51:10+02:00 Iryna Vashchyshak chancel@nung.edu.ua Yu. Movchan chancel@nung.edu.ua <p><em>To ensure the correct approach to energy management and efficient use by enterprises and organizations, an energy management system is being implemented. The article is about effectiveness of the energy management system at the 'ZOND' LLC. An analysis of the use of fuel and energy resources is carried out, taking into account the structure of energy consumption and cost. It is established that in order to ensure rational consumption, it is necessary to apply a comprehensive approach to analyzing and prioritizing the proposed energy efficiency measures. The constructive and operational shortcomings of the heating system are described. The implemented measures for the rational use of gas are presented. Lighting aspects are considered, including the transition to LED lamps and the use of natural light. Significant heat losses by external envelope structures are revealed and the implemented measures for the building insulation with polystyrene insulation boards (EPS) are described. The results of the economic analysis are presented. The effectiveness of the measures taken by the enterprise to ensure backup power supply in the conditions of prolonged power outages is analyzed. The analysis of the enterprise's work during prolonged emergency power outages is carried out. A number of both minor and significant shortcomings of the described measures to provide electricity to the company's consumers have been identified. Particular attention is paid to the selection and use of uninterruptible power supply units to keep critical consumers running. The use of special skylights, also known as solar daylight tubes or light tubes, to reduce the use of artificial lighting is proposed. A conclusion is made about the effectiveness of an integrated approach to managing the energy efficiency of an enterprise in the context of modern challenges and a high level of energy efficiency management at this enterprise is confirmed.</em></p> 2024-03-28T00:00:00+02:00 Copyright (c) 2024 Ірина Ващишак, Ю. Мовчан