Autonomous Energy Supply Research Articles

Development of autonomous energy supply of a mobile surface degassing plant.

Development of autonomous energy supply of a mobile surface degassing plant.

THE SIMULATION MODEL OF AN AUTONOMOUS ENERGY SUPPLY SYSTEM FOR HIGHWAY INFRASTRUCTURE OBJECTS

The presence of a centralized power supply with the appropriate infrastructure and an extensive distribution network with significant technological losses not only causes increased risks, but also calls into question the quality and reliability of the energy supply of remote objects. The use of small power plants based on renewable energy sources can solve the problem of power supply of transport infrastructure objects (public transport stops, pedestrian crossings, traffic control elements, etc.). However, the expediency of using one or another energy source requires simulation modeling of the parameters of these power supply systems. The purpose of this study is to develop a simulation model of the autonomous energy supply system of road infrastructure objects and to check its functioning in real conditions. The article describes the structural simulation model and presents the characteristics of its components. The order of functioning of the constituent elements and the peculiarities of their interaction are given. Experimental modeling of the dependences of the output power of the photovoltaic module on the voltage maintained at its output was carried out, and the obtained results were summarized. The developed model makes it possible to implement the mode of maintaining maximum performance thanks to the introduction of feedback to control the value of the input voltage of the converter, which is compared with the calculated (set) value of the voltage, calculated from the data of the actual load current and short-circuit current of the photovoltaic module for different values of light flux. The result of the comparison, with the appropriate sign, is sent to the proportional-integral regulator, the output control effect of which is the regulation of the output voltage of the converter and, related to it, the charging current of the battery, which, therefore, leads to a change in the input current and ensures the maintenance of the set voltage at solar cell outputs. Under this condition, its output current is directly proportional to the amount of solar radiation. It is also established that the selection of the minimum required capacity of the photovoltaic panel must be carried out taking into account the most unfavorable scenario regarding weather conditions and the season of the year in order to ensure the maximum charge of the battery.

Selection of optimal structure of an energy-supply system for objects in an agro-industrial complex based on renewable-energy sources

This study considers the issues in constructing optimal systems for autonomous energy supply to objects in an agro-industrial complex using renewable-energy sources (RESs). The regularities of distribution of the zones for optimal use of solar, wind, hydraulic, and integrated power plants are revealed by comparing their operational and economic indicators. To determine the zones of optimal use of various RESs types, a systematic approach is employed, which allows conducting a comprehensive analysis of the object, strictly systematizing of research, and performing synthesis, i.e., finding the optimal system under given conditions. The level of functional and structural perfection of the systems is considered by evaluating their internal characteristics through a functional and structural approach using structural, functional, and functional–structural descriptions of the systems where each system generates the corresponding model types. Synthesis of the optimal structure of a renewable energy supply system (RESs) is carried out based on the operating conditions and consumer power consumption according to an “efficiency–cost” criterion, an integral-quality indicator, a complex efficiency criterion, and private indicators of the quality and cost of the systems. An algorithm and a calculation program are developed that allows determining the optimal structure of autonomous RESs under specific cases and restrictions. The developed recommendations on the choice of an optimal system for autonomous power supply using RESs under Kazakhstan conditions provide practical importance because they can potentially minimize errors in the choice of RESs types during the design stage.

INTEGRATED ENERGY SUPPLY SYSTEM OF SOLAR AND BIOGAS ENERGY DEVICES IN A MOBILE HOME

This article lists the main dimensions and parameters of a mobile home with an autonomous energy supply system based on completely alternative energy sources for consumers of heat and electricity in regions far from centralized energy supply. An integrated example of a mobile home’s general principled circuit, such as a solar collector, solar photobathare, pyrolysis, and biogas devices, is described as a mobile (portable) home-mounted view and home exterior. In addition, the article describes the Mobile Home application facility under research and the energy and economic efficiency for rural and farm clusters, fishing beekeeping industries. The article presents the sequence and principles of operation of devices installed in a mobile home.

СИСТЕМИ АВТОНОМНОГО ТЕПЛОЗАБЕЗПЕЧЕННЯ БУДІВЕЛЬ

The critical energy infrastructure plays an important role in ensuring the energy security of the state, creating conditions for life of population and development of national economy. The work examines the problems of developing and designing an autonomous energy supply system as a component of critical energy infrastructure, it is necessary to analyze the functions of individual components of the system and the criteria that determine the energy efficiency of the system as a whole.A sufficient number of scientific papers are devoted to the analysis of research and publications on the functional analysis of distributed energy systems, in particular, the formation of the optimal structure of the local electric power system based on the assessment of the degree of proximity of the location of objects with the use of cluster analysis for modeling systems based on the Microgrid concept is considered.The purpose of the article is to develop the concept of an autonomous local energy supply system as a component of critical energy infrastructure in order to increase the level of energy security of the country.The transformation of the existing system of centralized heat supply (or its addition) is possible with the use of combined production of heat and electricity in autonomous local energy supply systems using cogeneration technology on modern high-efficiency equipment and the widespread use of renewable energy sources (RES) in accordance with the requirements of the IV energy transition. This approach is harmonized with project development of the EU – Europen Technology Platform SmartGrid energy supply platform based on distributed generation and Smart technologies.For the analysis of schematic solutions of the structure of the autonomous local energy supply system, the heuristic analysis technique was applied, which made it possible to optimize the management of energy resource generation processes, in the form of components: technical means (TK), informational (IS) and mathematical (MZ) support.The paper provides a theoretical analysis of an autonomous heat supply system based on the principles of process mod-eling when using an automated control and energy monitoring system with self-learning elements.

Gasification as a way to combat air pollution in Krasnoyarsk

The main hydrocarbon fuel for the energy supply of the city of Krasnoyarsk is coal, local brown coal from Borodino. The energy supply of autonomous consumers of the city, and these are mainly private households on the left bank of the Yenisei, is carried out at the expense of their own boilers running on coal, wood and other solid fuels. This creates an acute problem of air pollution in the city, which affects the life and health of people. Natural gas is used only in liquefied form and in small quantities. One of the ways to reduce emissions of harmful substances into the atmosphere is gasification of the housing stock, which has become extremely relevant after the adoption of the Gasification Roadmap. Various options for household energy supply and gasification are considered and evaluated. The most profitable option for gasification is the construction of a branch from the main export gas pipeline Power of Siberia-2. However, it will be implemented no earlier than in 5-10 years, so other options for autonomous energy supply with lower emissions are offered. In addition, it is proposed to take into account the following effects when making a decision on the energy supply of households: the cost of using different types of fuel, inter-fuel competition, the interests of energy companies, the region, the population, greenhouse gas emissions, convenience, comfort and health of the population, the goals of the state for a comfortable environment.

Hydrogen generator integrated with fuel cell for portable energy supply

An autonomous power supply device based on a 30 W fuel cell (FC) stack and a hydrolysis-type hydrogen generator was developed. The creation of this device included the construction of a unit for hydrogen generation, development of an electronic control unit for the operation of the device, and testing and optimizing the overall performance. The hydrolysis of NaBH4 was catalyzed by Pt-based catalysts and was studied for different reactor configurations and reagent concentrations. The flat type of the reactor, Pt catalyst deposited on cordierite as a support, and 10% solution of NaBH4 proved to be the most efficient when generating H2 for use in the 30 W FC. A developed electronic control unit effectively regulates the hydrolysis reaction rate and provides the required hydrogen supply to the FC. A Li-ion battery was used to start the work of the developed system. One important feature of the developed electronic system is the use of supercapacitors, enabling smoothening of the periodic variations of the generated power. The created hydrolysis unit integrated with the FC provides a stable power supply for at least 9 h from one refueling (U const = 12 V, I = 0–2.5 A, nominal power = 30 W). The specific generated power of the system when accounting for its weight and volume is similar to the analogues described in the reference data, while the electronic circuit enables its stable and efficient performance, satisfying the consumer needs for autonomous energy supply when a stationary electrical grid is not available.

A Possibility for Large-Scale Production of 238Pu in Light-Water Reactor VVER-1000

This paper considers the possibility for large-scale production of plutonium isotope 238Pu in the light-water nuclear power reactor VVER-1000. 238Pu is a unique source of long-term autonomous energy supply in various devices for remote regions of the Earth and in outer space. The design of the irradiation device with 237NpO2 as a starting material is proposed, which is placed in the central zone of the VVER-1000 reactor core and makes it possible to achieve 8% of the specific Pu production (Pu/237Np) by optimizing the pitch of NpO2-rod lattice. The computations showed that the scale of 238Pu production in the irradiation device was remarkably larger (2 ÷ 7 times more) than similar values in research reactors. At the same time, the use of heavy neutron moderators with low neutron absorption (natural lead or lead isotope 208Pb) around the NpO2 fuel assembly (FA) made it possible to obtain high-purity 238Pu with the content of 236Pu below 2 ppm. The paper also shows that if the irradiation device is placed in central zone of the VVER-1000 reactor core, then the displacement damage dose in the reactor vessel remains low enough to conserve its strength properties throughout the entire period of the reactor operation (60 years).

BACK-UP GROUNDWATER SUPPLY SYSTEMS — A NECESSARY SAFEGUARD FOR HUMANITARIAN DISASTERS IN CONDITIONS OF MILITARY AGGRESSION

Many cities in Ukraine use surface centralized water intakes, connected to a single energy network, which are often located at a considerable distance (30-45 km) from settlements (for example, Mykolaiv, Chernivtsi, etc.), which makes the water supply system extremely vulnerable to military aggression and sabotage. Given Russia’s constant claims to our independence, it is clear that a guaranteed supply of drinking water to the population is as important a factor in its security as a strong modern army. Considering the existing means of emergency water supply and water treatment (imported water, mobile treatment plants designed to prepare existing water sources, pumping stations, etc.) we can conclude that the most secure and sustainable source of drinking water is groundwater. For better protection and access to water, even during street fights, it is proposed to equip local well water intakes with autonomous power supply, designed for 2.0-3.5 thousand users, with compact installations for water purification and disinfection. The organization of such a network has at least five problematic components: 1 — resource - the availability of the required amount of water, 2 — quality - the availability of drinking water sources; 3 — safety - sufficiently high protection of the water source from external influences; primarily from qualitative and quantitative depletion and targeted sabotage; 4 — financial and economic; 5 — energy supply. Separate water supply and sewerage networks for drinking and technical water should be introduced. The drinking water supply system should be arranged in the form of a well-protected local water supply, and domestic and technical water supply should be left centralized. Flow rates of drinking water intakes should be calculated based on human needs for drinking water per day: 1.5-2.0 dm3 for drinking plus 4-5 dm3 for cooking. It is proposed to use renewable energy sources for autonomous energy supply of boreholes. The experience of the Russian-Ukrainian war shows that all other options for drinking water supply to the population in conditions of military aggression are less protected, are unstable or temporary and have significant shortcomings.

Ecological and economic efficiency of the use of alternative energy technologies including hydrogen to reduce of the anthropogenic load in the central ecological area of the Baikal natural territory

The central ecological area of the Baikal natural territory covers some districts of the Irkutsk oblast and the Republic of Buryatia, located on the coast of the Lake Baikal. Due to the natural uniqueness and special status of doing economic activity, the assessment of the impact on the environment in this territory is very importance. An analysis of the functioning of energy objects showed that a significant part of the territory is provided with a centralized electricity supply with developed electric grid infrastructure. There are only a few remote settlements with autonomous electricity supply from diesel power plants. The main sources of pollution are numerous boiler houses that provide heat to the population, social and administrative institutions. In all, there are 98 heat energy sources in the territory, of which 66 (or 70%) use coal. The problems of environmental pollution are mainly caused by the use of coal in a small boiler house, worn-out equipment, and the lack of an appropriate level of flue gas treatment. The total estimated emission of pollutants into the atmosphere from heat energy sources is estimated at 20–25 thousand tons per year. In order to reduce the anthropogenic impact from energy objects, it is advisable to use renewable energy sources, hydrogen technologies, coal substitution with environmentally friendly fuels, use of electricity for heat energy supply, installation of environmental protection equipment and the implementation of energy-saving measures. The methodological approach and simulation models developed at MESI SB RAS were used to determine the competitiveness conditions of alternative technologies and energy carriers. The studies evaluated the environmental and economic efficiency of energy production technologies by using specific indicators: the capital intensity of reducing 1 ton of emissions and environmental capital return by 1 million rubles for the conditions of the central ecological area. The potential for reducing emissions into the atmosphere by use of renewable energy sources in autonomous energy supply areas is less than 1% of the current level of total emissions from energy objects. The potential for reducing emissions by replacing boiler houses with a capacity of less than 0,2 Gcal/h by a heat pump units is no more than 12%. The biggest environmental effect can be achieved by using alternative energy carriers including hydrogen instead of coal. Moreover, the potential for reducing emissions is 60% of the total emissions. In addition to these activities are the least capital intensive. The most effectively is the replacement of coal with natural gas. Rational gas consumption in the coastal areas of Lake Baikal is estimated at 175–190 thousand tons of equivalent fuel. The real possibility of transferring small boiler houses to gas arises during the construction of an export gas pipeline from Russia (through the territory of the Irkutsk oblast) to China via Mongolia, or by the small-scale production of liquefied natural gas. The most currently implemented direction is the use of electricity for heat energy supply. The potential volume of electricity to replace coal in boiler houses of the central ecological area is 1,3 TWh per year, however, the competitive electricity tariff is estimated less than 2 US c/kWh, which is several times lower than current tariffs. Hydrogen technology is currently very capital-intensive, but using it in a way similar to using electricity for heat eliminates pollutant and greenhouse gas emissions. Now days, there are no effective financial mechanisms aimed at stimulating the reduction of the anthropogenic pressure on the environment from existing energy sources, including for the use of alternative technologies. As the result, significant financial support is required in the form of special cost compensation mechanisms for energy producers and/or consumers.

Electrical and Hydrogen Microgrid - Energy Control of a Self-Sufficient Supply System Based on a Combined Electrical and Hydrogen Distribution Grid

The main goal of assembling a self-sufficient microgrid is to integrate all technical equipment into an autonomous energy supply system as a virtual power plant (VPP). The system integration focuses on the power electronic devices and the combination of gas and electrical supply chains. The developed microgrid structure is fed from renewable energy systems (green hydrogen), the electrical grid and the H2 gas grid with a liquid or gaseous energy source. In comparison to an island grid, the microgrid can be operated in parallel mode with the common public grid. The associated challenges of transient energy flows and the holistic view of a regulated microgrid based on an electrical grid and an H2 gas network are part of this article.

THE SYSTEM OF ACCOUNTING FOR BASIC TECHNICAL RESOURCES AND ITS IMPROVEMENT IN CONSTRUCTION

Introduction. Construction is one of the key sectors of the Ukrainian economy, the management of which requires deep engineering, logistics and economic knowledge. Among the important resources of the construction industry are technical resources, which are based on construction machinery and equipment. These machines and equipment are systematically used during construction and installation works and significantly facilitate the work of builders and speed up the commissioning of buildings and structures. Unfortunately, not enough attention has been paid to the accounting of construction machinery and equipment as the main technical resources of construction, but it was and is relevant, so we will try to deal with this topic in more detail. The purpose of the article is to classify the main technical resources in construction, analyze the state and form proposals to improve their accounting system and, in particular, the system of analytical accounting accounts. Methods. The study used general methods: systems approach, induction and deduction, synthesis and generalization in order to improve the classification of basic technical resources in construction, as well as special methods in order to analyze the state and form proposals to improve accounting and, in particular, analytical accounting. basic technical resources in construction. Results. The author's definition of technical resources is formulated and the list of fixed assets that are part of the main technical resources of construction is specified. The dynamics and specific mass of fixed assets in Ukraine, as well as the structure of non-current tangible assets of one of the construction companies are analyzed. The classification of construction machinery and equipment with the indication of potential numbers of their analytical accounts, as well as a number of classification features of such machinery and equipment to meet the information needs of users with management accounting indicators. The information on the largest international manufacturers of construction equipment is generalized. The author's vision on current issues and some issues of accounting for fixed assets, including the accounting of basic technical resources of construction in terms of reservation and coverage of future current costs for repairs and improvements of health facilities; opening of a separate sub-account 47.4 “Ensuring the restoration of the technical park”; transition to accounting for fixed assets at fair value with documentary evidence of the assessment; separate accounting of operating costs and accounting of maintenance costs of construction machinery and equipment, etc. Perspectives. In further research it is expedient to reveal the tasks, methods and organization of accounting of the main technical resources of construction enterprises using information and computer technologies, first of all, accounting programs of Ukrainian production (“Clerk”, “BAS Accounting”, “IT-Enterprises”, “Master Accounting”, etc.). At the same time, it is necessary to develop research on Ukraine's economic policy and the formation of financial resources to establish a full cycle of domestic production of construction machinery in Ukrainian machine-building plants in the context of postwar reconstruction of industrial and non-industrial facilities, new approaches to autonomous energy supply of buildings and structures (including energy supply of the houses of the future – “smart homes”), etc.

Enhanced swing electromagnetic energy harvesting from human motion

Energy harvesting from human motion has received considerable interests for its promising potential to provide an autonomous energy supply for low-power devices. In order to improve comfort and wearability during human motion, this paper presents a Halbach array enhanced electromagnetic energy harvester with swing pendulum to maximally exploit the limb swing excitations. A theoretical model of magnetic arrays is established based on the magnetic charge method. The dynamic equations are derived by the Lagrange equation to predict the output voltage of proposed harvester. The magnetic fields of Halbach array and conventional array are compared under different magnets angles. Moreover, the experimental voltage under harmonic excitations are measured to verify the accuracy of the proposed model, and quantify the enhanced energy harvesting performance by Halbach array. Additionally, the generated average power increases with an increase of walking or running speed. The average power of the proposed device is approximately 0.38 mW at a running speed of 8 km/h when attached to the lower-limb. Consequently, the corresponding mass power density is 23 μW/g during human motion. The power density of proposed harvester can be higher after further optimization, and its applications may expand to smart watch, wristband or even cell phone.

The characteristics of energy security in decentralised zones and autonomous objects of electrification

The article aims to develop a set of objective criteria for assessing the state of energy security in decentralised remote regions of the north, Arctic zones and autonomous energy supply complexes. The authors assessed the potential of renewable energetics, which determines the effectiveness of decentralised energy complexes based on renewable energy sources, in improving the energy security of such entities. The indicators for assessing the energy security of research objects were developed on the basis of an analysis of the ratio of the most significant threats, as well as territorial and situational factors of the autonomous energy of the north and Arctic zones. A study of the security of the research objects allowed the development of a set of criteria for territorial segments and autonomous electrification objects, forming an objective assessment of the energy security of isolated hard-to-reach areas. An analysis of the possibilities of renewable energy sources in achieving certain positions (resource sufficiency, environmental acceptability, technological attainability and reliability) of the energy security of the considered level was conducted. Groups of properties and processes within the territorial framework of a decentralised region, separated by the directions of monitoring the energy security of local energy zones are proposed as objects of indicative analysis. The differentiation of the developed criteria by the levels of the energy zone and decentralised energy complex allowed consideration of all the specific features of these objects and cover the factors of mutual influence with accompanying systems in the formation of the state of energy security. When considering a possible option for the participation of renewable energy sources in the structural and resource provision of autonomous electricity supply, it was found that such diversification will affect both the improvement of some criteria of energy security of the considered level, as well as the deterioration of others.

ТРАДИЦИОННАЯ И НОВАЯ МАЛАЯ ЭНЕРГЕТИКА В СЕВЕРНЫХ РЕГИОНАХ РОССИИ.

For the North and Arctic regions of Russia the task of the small power generation development is important because there are large areas of expensive decentralized electricity supply (DES) and difficult living conditions. In studying the processes of the small energy development, it is important to detail regional features and economic conditions that determine competitiveness of promising types of energy sources. The article presents the analysis results of the DES of the Russia northern territories on the example of three regions: the Republic of Komi, the Arkhangelsk region, the Republic of Sakha (Yakutia). The analysis aim is to determine the existing prerequisites and barriers to active development of the small power generation in the North. On the basis of the detailed energy-economic indicators and the received generalizations, options for improving the efficiency of autonomous energy supply based on conventional and new small-sized power generation technologies are being considered. The analysis showed that the development of DES zones does not have the institutional incentives and sufficient resource base for qualitative technological modernization. Most of the investment and operating costs of DES in the northern regions are compensated through cross-and budget subsidizations. Traditional diesel generation remains high-cost and low-efficiency, its modernization is carried out at slow rate, the potential of electric and heat energy cogeneration is not used. Renewable energy technologies are not ready for large implementation in local energy systems of the North and Arctic 14of Russia. The renewables projects, implemented over the past five years, are mainly experimental and demonstration. The analysis of the indicators of the "northern" renewable energy projects does not confirm their economic efficiency. The reasons are not only in the high unit investment costs, but also in relatively low utilization rates of the installed capacity (capacity factors) of solar and wind power plants. There is no targeted state support for the development of the efficient small-sized power generation in northern regions.

«Roadmap» for the Development of Eco-sustainable Habitat in Architecture: Innovative Approaches

The environmental priorities of the formation of the habitat space in the context of the paradigm of sustainable development of architecture as a challenge to civilization are considered. An environmental approach has been developed in architectural and urban practice as an alternative to the formation of architectural objects. Current trends and perspectives of the environmental approach in the formation of an eco-positive habitat in the context of the use of sustainability principles in the design of energy efficient buildings have been defined. Innovative approaches to the organization of the spatial environment of the future have been revealed, integrated ecological systems of automated building management have been considered, as well as environmental techniques for the formation of architectural objects using autonomous energy supply. The concepts of sustainable architecture in the context of eco-oriented thinking have been demonstrated. Bio-tectonic concepts of the organization of spatial habitat in modern conditions, as well as prospects and strategy for the development of sustainable architecture of the future have been defined. It is proposed to consider the “road map” of urban civilization in the context of the formation of a comfortable and safe spatial habitat.

Energy-Aware System Design for Autonomous Wireless Sensor Nodes: A Comprehensive Review.

Nowadays, wireless sensor networks are becoming increasingly important in several sectors including industry, transportation, environment and medicine. This trend is reinforced by the spread of Internet of Things (IoT) technologies in almost all sectors. Autonomous energy supply is thereby an essential aspect as it decides the flexible positioning and easy maintenance, which are decisive for the acceptance of this technology, its wide use and sustainability. Significant improvements made in the last years have shown interesting possibilities for realizing energy-aware wireless sensor nodes (WSNs) by designing manifold and highly efficient energy converters and reducing energy consumption of hardware, software and communication protocols. Using only a few of these techniques or focusing on only one aspect is not sufficient to realize practicable and market relevant solutions. This paper therefore provides a comprehensive review on system design for battery-free and energy-aware WSN, making use of ambient energy or wireless energy transmission. It addresses energy supply strategies and gives a deep insight in energy management methods as well as possibilities for energy saving on node and network level. The aim therefore is to provide deep insight into system design and increase awareness of suitable techniques for realizing battery-free and energy-aware wireless sensor nodes.

Application of highly efficient hydrogen generation and storage systems for autonomous energy supply

Purpose. Development of scientific and engineering solutions to improve the reliability of power supply of stand-alone systems and mitigate the environmental burden by using hydrogen technologies for energy storage. Methodology. The calculation method provides a set of optimal technical solutions for determining the effective operating modes of a stand-alone power supply system for supplying hydrogen to a fuel cell based on the electric load schedules of a particular consumer by using a computational experiment. Findings. Based on the study, a technological scheme of a stand-alone power supply system based on fuel cells was developed, and an approach to the creation of a metal hydride system for accumulating and supplying hydrogen to fuel cells was substantiated. A calculation algorithm was developed that allows calculating the annual energy balance of a specific consumer and selecting the necessary equipment to implement the scheme based on the annual heat and electric load schedule. Originality. An alternative scheme of guaranteed electric power and heat supply for a stand-alone house without using imported fuel is proposed. The advantage of such a scheme is that it is closed because hydrogen is produced on site to power the fuel cell, while the metal hydride hydrogen storage system is capable of performing hydrogen absorption and its release due to the hot and cold water resources available in the system. Practical value. The technology for converting the energy of primary sources by creating a wind-driven energy technological complex using an electrolysis plant and a metal hydride hydrogen storage system will solve the problem of smoothing the irregular electric power supply from renewable sources.

Prospects for the implementation of autonomous power supply systems of agro-industrial production

Annotation Purpose. Improving the efficiency of agricultural production by creating a reliable autonomous power supply system based on natural and own renewable energy sources. Methods. Methods of system analysis and design of technical systems. Results. Principles of building an effective system for the use of natural and own renewable energy sources in agriculture. The general structure and parameters of the energy supply system of agricultural production. Conclusions 1. According to the energy strategy, Ukraine by 2030 should increase the share of renewable energy in its overall energy balance by almost 3 times – from 8 to 25%. 2. One of the real ways to increase the reliability and efficiency of electricity supply of agricultural facilities is the transition to autonomous energy supply systems based on the use of their own renewable energy sources with a relative production cost within 0.43–0.98 of the cost of centralized electricity production. 3. The structure of a specific power supply system of the agro-industrial sector should be formed on the basis of the characteristics of production and household needs, assessment of the potential and characteristics of renewable energy sources and conditions of safe, cost-effective operation. Keywords: agricultural production, renewable energy, ecology, efficiency.

Principles of choosing natural renewable energy sources for farm conditions

Annotation Purpose. Improving the efficiency of agricultural production and reducing its negative impact on the environment through the use of natural renewable energy sources. Methods. Methods of system analysis and design of technical systems. Results. Principles of building an autonomous system of electricity supply of farms on the basis of natural renewable energy sources. The general structure of the system of autonomous energy supply of agricultural production. Conclusions 1. Over the next 30 years, Ukraine should completely switch to renewable energy, increasing its production by more than 10 times. 2. Under the conditions of Ukraine, the basic natural source of energy when creating autonomous systems of electrical supply of agricultural facilities should take solar energy. 3. In the structure of autonomous power supply systems of farms, it is necessary to provide energy storage facilities and equipment for the use of excess energy at certain periods of the year. Keywords: agricultural production, renewable energy, reliability, efficiency.