Autonomous Power Supply Research Articles

УНІВЕРСАЛЬНА МАТЕМАТИЧНА МОДЕЛЬ АВТОНОМНОГО АСИНХРОННОГО ГЕНЕРАТОРА З КОНДЕНСАТОРНИМ САМОЗБУДЖЕННЯМ

A universal mathematical model of an autonomous asynchronous generator with capacitor self-excitation in retarded phase coordinates is proposed, taking into account the electromagnetic connections between the windings of the stator and rotor phases, saturation of the main magnetic circuit, and active power losses in the magnetic circuit elements. The model provides an opportunity to analyze stable periodic modes and transient electromagnetic and electromechanical processes in autonomous power supply systems with arbitrary switching schemes of its elements and asynchronous generators. The model provides the possibility of taking into account the residual magnetization of the magnetic circuit of an asynchronous generator and the change in rotor speed during the course of the self-excitation process of an asynchronous generator with a grounded neutral of the stator winding and an asymmetric load. References 10, figures 2.

A Compact Broadband Rectifier Based on Coupled Transmission Line for Wireless Power Transfer

Wireless Power Transfer (WPT) can effectively solve the problem of autonomous power supply for low-power devices. Rectifier is the key component in WPT technology. In this paper, a novel impedance matching network for the broadband rectifier is proposed. This impedance matching network compensates for the diode impedance and reduces its impedance change when the frequency or input power changes. The passive boosting mechanism utilizing coupled transmission lines (CTLs) improves the power conversion efficiency (PCE) of the diode in the low power region. The structure is especially optimized for low-power device applications. For validation, a broadband rectifier operating at 1.9–3 GHz is fabricated and measured. The structure fabricated on the Rogers 4003 substrate with a thickness of 1.508 mm and the diode is HSMS2860. The DC voltage Vout on the load (RL=1300 Ω) was measured. The results show that at 0 dBm, the PCE keeps more than 60% at 1.98–3 GHz. The peak PCE of 79.6% is obtained at 4 dBm. The compact size of the broadband rectifier is 19 mm × 21 mm. This broadband rectifier for low input power ranges can be applied to WPT technology.

Simultaneous lightwave information and power transfer for NLOS ultraviolet communications under different weather conditions

In this work, a power allocation scheme for ultraviolet communication (UVC) with simultaneous lightwave information and power transfer (SLIPT) is proposed. Based on the non-line-of-sight (NLOS) single scattering channel model, the path loss and bit error rate (BER) performance of the UVC system with different geometrical parameters are analyzed. The effects of three types of weather, light rain, fine weather and severe fog conditions are considered. It is proved that the path loss is minimized on foggy days with minimum BER, followed by sunny days. The proposed SLIPT approach that the receiving energy is in turn divided into two parts, one for energy harvesting (EH) and the other for information decoding (ID). The system is designed to optimize energy harvesting for autonomous power supply, while ensuring a specified BER threshold and maintaining spectral efficiency. The effects of three types of weather on the SLIPT system are further investigated. It is demonstrated that under shorter communication distance(r), smaller elevation angle of receiving terminal (βR), larger field of view (FoV) and lower spectral efficiency(η) conditions, a higher percentage of energy is allocated for EH, with foggy days being the most favorable. The extreme geometric parameters of rainy condition can lead to the inability of communication, which needs to be limited to r ≤ 10 m, elevation angle of Rx ≤ 6°, FOV ≥100°, spectral efficiency ≤3, under the preset parameters in this paper.

DEVELOPMENT OF SCIENTIFIC FOUNDATIONS AND METHOD OF AUTONOMOUS POWER AND GAS SUPPLY OF REMOTE CONSUMERS FROM GAS DISTRIBUTION NETWORKS

The development and implementation of independent power supply systems with a high degree of autonomy is becoming an urgent task for the development of remote and inaccessible regions of the country, both due to the lack of energy capacities and accessible networks in newly developed areas, and the high cost of allocating separate power lines for remote and compact settlements. The increase in the scale of central networks is associated with high capital investments and long project implementation time, which creates inconvenience for consumers and the development of small and medium-sized enterprises. At the same time, unlike power supply, gasification issues, which are actively being resolved in all regions of the country, make it possible to connect new consumers of natural gas several times faster and cheaper, which is due to the high manufacturability and speed of construction of polyethylene gas pipelines of distribution networks, provided that gas pipelines pass in the region. In addition to lower capital and operating costs, the process of transporting energy resources through pipelines in the form of a primary source — gas — is characterized by significantly lower losses compared to water and electricity. At the same time, network gas in combination with trigeneration technologies and cryogenic hydrocarbon storage can be used not only as boiler fuel, but also as motor fuel, a source for generating electricity, heat and even cold with a replenished autonomous reserve. Thus, as an alternative solution to traditional power systems, it is proposed to use hybrid power systems — systems based on trigeneration plants with gas piston installations, turbine and screw machines, as well as cryogenic gas storage facilities that can provide the population with electricity, heat, cold and motor fuel. The article analyzed the state and development of the fuel and energy complex in Russia, conducted a study of the needs for heat, gas and electricity for an average compact settlement with small and medium-sized enterprises. Analysis and selection of equipment parameters for uninterrupted autonomous power supply of the economy was carried out.

Synthesis of an automatic control system for a voltage inverter as part of an autonomous power supply system with a hydrogen module

This paper examines the problem of synthesizing a two-loop control system for a three-phase voltage source inverter designed for an autonomous power supply system. This type of DC/AC converters is an essential part of power supply systems with renewable energy sources as primary sources, and, accordingly, must corresponds to the requirements for the electric power quality. These requirements are met through circuit design solutions, as well as through the construction of high-precision automatic control systems. The system integrates: a hydrogen electrolyzer, a hydrogen storage system, and a hydrogen fuel cell. The paper proposes a method for calculating the parameters of PI controllers with resonant components, based on the time-scale separation method and allowing independent adjustment of the controller components. The introduction of a resonant component ensures high tracking accuracy for a desired main voltage harmonic and selective suppression of external harmonic influences. The proposed approach allows to synthesize an automatic control system that significantly improves the quality of the voltage inverter output parameters.

Prospects for the development of charger-discharge devices of spacecraft power supply systems

Power supply system (PSS) is designed to ensure uninterrupted autonomous power supply of on-board equipment in all modes and at all stages during the active life of spacecraft. Lots of PSS makes up a significant proportion of the mass spacecraft and improvement of specific energy characteristics PSS this leads to a synergistic effect when the mass and energy consumption resources available for the payload are simultaneously increased, which increases efficiency of spacecraft generally. The article considers the evolution of structural and circuit solutions for PSS spacecraft, its energy-converting equipment and the effect of these changes on energy-mass characteristics PSS. It is shown that a significant effect on energy and mass characteristics PSS provide structural and circuit design solutions for charger and discharge devices of energy-converting equipment and the choice of voltage value accumulator batteries (AB). The development of the element base, the creation of programmable digital devices capable of functioning under the influence of space factors and the emergence of new circuit design and management solutions for pulse converters that have occurred in the last decade opens up new opportunities for improvement of the PSS of spacecraft. In the article as a charger and discharge device PSS reviewed pulse voltage converter (PVC) with a new modulation strategy, with the ability to reverse the flow of energy and the ability to work in a step-up mode with high efficiency. Its application as a single charger-discharge device (CDD) allows for a significant improvement in performance CDD and PSS in general, such as efficiency, energy mass, reliability and a number of others. Ability PVC to reverse the flow of energy and the possibility of working in a step-up mode opens up the possibility to abandon the use of AB with a voltage lower than the voltage at the main output PSS and switch to using AB with an average discharge voltage close to the voltage at the main output PSS. Such a structural and circuit design solution CDD and AB will allow you to increase efficiency of CDD up to 99 % and additionally improve energy and mass characteristics PSS.

Разработка мобильной энергоустановки на древесном топливе для автономного энергообеспечения объектов лесного комплекса

Актуальность автономного энергообеспечения объектов лесного комплекса обусловлена большими ресурсами древесины на удаленных от сетей централизованного электроснабжения и газоснабжения территориях. Целью работы является повышение эффективности автономного энергообеспечения объектов лесного комплекса путем разработки и оптимизации миниэлектростанций на древесном топливе. При решении поставленных задач применены методы численного моделирования технических систем с использованием среды динамического моделирования SimInTech. Выполнен анализ результатов серии имитационных экспериментов функционирования технологической схемы мини-электростанции. В статье предложена имитационная модель автономной энергоустановки на древесном топливе, выполненная в программе SimInTech с применением инструментов модуля «Теплогидравлика». Представлены результаты численного моделирования работы мини-электростанции электрической мощностью 3,8 МВт, на базе газовой турбины открытого цикла, турбины органического цикла Ренкина и термохимической газификации древесного топлива. Получены результаты численного моделирования в виде основных номинальных режимных параметров мини-электростанции. Определены давления, температуры и массовые расходы потоков рабочих тел циклов энергоустановки и теплоносителей. Определены механические мощности: компрессора и турбины газотурбинной установки, вентилятора системы конденсации органического рабочего тела, турбины цикла Ренкина на фреоне R113 и насоса подачи фреона в испаритель при заданном режиме работы мини-электростанции. Предложенная модель позволяет исследовать режимы работы энергоустановки, при переменных параметрах древесного топлива и окружающей среды, подбирать оптимальные конструктивные и режимные параметры компонентов миниэлектростанции. В частности, были определены оптимальные значения расхода охлаждающего конденсатор органического рабочего тела воздуха по условию максимизации КПД нетто электростанции. Полученные результаты способствуют дальнейшей технологической и конструктивной проработке энергоустановок, могут быть использованы для обоснования эффективности и реализуемости проектов автономного энергообеспечения промышленных объектов. The relevance of the theme is due to the large resources of wood in areas remote from centralized power supply and gas supply networks. Autonomous energy supply of such objects of the forestry complex can be organized using wood fuel. The aim of the study is to increase the efficiency of autonomous energy supply of timber complex objects by developing and optimizing wood-fired mini-power plants. The method is to numerical modeling. For this, a simulation model of a mini-power plant was developed using the SimInTech dynamic simulation program. We have made the numerical experiments using this mathematical model. The article presents a technological scheme of a mini-power plant based on an open cycle gas turbine, a Rankine organic cycle turbine and wood fuel gasification. The results of numerical simulation of the operation of a mini-power plant with an electric power of 3,8 MW in the SimInTech program using the tools of the Thermal Hydraulics module are presented. The main technological parameters of the power plant in the nominal operation conditions are calculated: pressures, temperatures and mass flow rates of working fluid flows of power plant cycles and heat carriers. We have also calculated the rated mechanical powers of the units: the compressor of the gas turbine plant and the gas turbine, the fan of the organic working fluid condensation system, the Rankine cycle turbine running on R113 freon, and the pump for supplying freon to the evaporator. The proposed model allows you to explore the operating modes of the power plant, with variable environmental parameters, to select the optimal design and operating parameters of the components of the mini-power plant. In particular, the dependence of the net efficiency of the power plant on the consumption of cooling air for the condenser of the organic working fluid was studied. As a result, the optimal values of the cooling air consumption were determined according to the condition of maximizing the net efficiency of the power plant. The obtained results contribute to further technological and constructive improvement of power plants. The results of the study can be used to substantiate the effectiveness and feasibility of projects for autonomous power supply of industrial facilities.

Renewable energy sources in Kyrgyzstan and energy supply to rural consumers

The study assesses the potential of renewable energy sources in Kyrgyzstan and explores their application to provide energy to rural consumers. This study used an approximation of the parabolic function of solar radiation change, statistical processing of data on the average annual water flow of small rivers, as well as calculation of the volume of manure produced and its processing into biogas and bio fertilisers to assess their potential in agriculture and environmental impact. Kyrgyzstan, located between 40 and 68° north latitude, has evenly distributed solar radiation, small rivers and biomass, which have significant renewable resources. The distribution of solar radiation on the territory corresponds to the normal law of the monthly average mathematical expectation of 175.79 kWh/(m²*month) and a standard deviation of 92.44 kWh/(m²*month). On average, each square metre of a solar power plant can produce 0.451 kWh of energy. The intervals of average water discharge between the small rivers of Kyrgyzstan follow a power law distribution with a mathematical expectation of 3.112 m³/s and a standard deviation of 2.46 m³/s. With a natural water flow rate of 0.652 m³/s, a low-pressure micro-hydroelectric power plant (with a water head of 1 to 2 m) can generate up to 8.95 kW of power. The total consumption of biogas by an average farm in Kyrgyzstan and its consumption for heating raw materials in a bioreactor during the cold season ranges from 16.34 to 18.93 kg/hour. This demand for biogas is met by producing domestic feedstock (animal manure) using compact biogas plants with reactors of up to 20 m³. These facts indicate that the use of the above-mentioned renewable energy sources in Kyrgyzstan can provide autonomous power supply to remote rural consumers and contribute to solving existing environmental problems, as well as energy-saving

Mathematical model of a battery energy storage for a standalone solar photovoltaic plant

Relevance. One of the priority areas for modern energy development is the active use of renewable energy technologies, the leading position among which in terms of the volume of commissioned generating capacity and areas of practical application is occupied by photovoltaics. In recent years, solar photovoltaic plants are increasingly being used as part of autonomous power supply systems, which is largely facilitated by a significant reduction in the cost of their components due to improved technology. Autonomous power supply systems can vary significantly in power, operating conditions, requirements for uninterrupted power supply and many other factors. This determines the high importance of the task of choosing the composition of the main electrical equipment that ensures optimal technical and economic indicators of the designed energy system. To make a reasonable choice of the equipment of an autonomous photovoltaic power plant, simulation models of all its main components are required that adequately reflect their performance characteristics under real operating conditions. An important component of autonomous photovoltaic plants is the energy storage device, which includes a battery and a solar controller that manages the energy balance of the power plant. The settings of the solar controller largely determine the operating modes of the photovoltaic power plant, on which the service life of the batteries primarily depends. Taking into account the fact that the costs of energy storage constitute a significant share of the costs of the total financial investments in the designed power plant, the problem of reliably assessing the service life of batteries is very relevant. Aim. Development of a mathematical model of energy storage system for the design and optimization of the equipment of autonomous photovoltaic plants. Methods. Mathematical and numerical modeling using the MatLab/Simulink software package. Results. A mathematical model of a battery has been developed, based on the modified Shepherd model and the kinetic model of a rechargeable battery. The model is universal and can be used to simulate the static and dynamic characteristics of different types of batteries. To identify model parameters, only the technical specification data provided by the manufacturer is sufficient. The complex model includes a battery life model, which allows you to dynamically adjust the available maximum battery capacity during operation.

Use possibility analysis for wind energy in autonomous car interior heating

Introduction. When driving cars in winter on intercity routes, problems may arise if the highways are covered with snow as a result of heavy snowfalls, which can last for several days or more, and movement during this period becomes impossible. An analysis of statistical data on weather events in winter has shown that in many regions, the closure of trails as a result of prolonged snowfalls can reach up to fifteen percent. In this case, an autonomous energy source, which it receives through the use of environmental properties, can provide significant assistance in improving the situation and increasing safety. The paper considers the technical solution and carries out a theoretical analysis of its characteristics aimed at solving the problem of autonomous power supply of the car interior in severe weather conditions.Materials and methods. The paper presents a technical solution and a theoretical analysis of its characteristics aimed at solving the problem of autonomous power supply of the car interior in severe weather conditions.Results. Based on the results of the information search, the design of a compact low-power wind power plant is proposed. The calculation of the heat loss of the car interior, the characteristics of a compact wind power plant was performed and the generated power required to heat the car interior in an extreme situation was determined.Discussion and conclusions. It has been established that the presented design of a low-power wind power plant can be used as a prototype for the development of an industrial design of an autonomous energy source for heating a car in extreme conditions. Similar installations can be used in other industries, for example, tourism, agriculture, and geological exploration.

Implanted Carbon Nanotubes Harvest Electrical Energy from Heartbeat for Medical Implants.

Reliability of power supply for current implantable electronic devices is a critical issue for longevity and for reducing the risk of device failure. Energy harvesting is an emerging technology, representing a strategy for establishing autonomous power supply by utilizing biomechanical movements in human body. Here, a novel "Twistron energy cell harvester" (TECH), consisting of coiled carbon nanotube yarn that converts mechanical energy of the beating heart into electrical energy, is presented. The performance of TECH is evaluated in an in vitro artificial heartbeat system which simulates the deformation pattern of the cardiac surface, reaching a maximum peak power of 1.42W kg-1 and average power of 0.39W kg-1 at 60 beats per minute. In vivo implantation of TECH onto the left ventricular surface in a porcine model continuously generates electrical energy from cardiac contraction. The generated electrical energy is used for direct pacing of the heart as documented by extensive electrophysiology mapping. Implanted modified carbon nanotubes are applicable as a source for harvesting biomechanical energy from cardiac motion for power supply or cardiac pacing.

Modular wind generators for autonomous power supply to remote mining areas mineral resources

The use of renewable energy sources to supply power to energy-isolated areas is an urgent topic. The simplicity of the design and high reliability of inductor generators create good prospects for their use in wind power plants as an alternative to synchronous and asynchronous electric machines that are currently in use. An obstacle to such an application is the specifics of the design, construction, and execution of modular machines with magnetic switching, concentrated windings, and a distributed magnetic system integrated into the wind turbine design. The purpose of the study is to consider cause-effect relationships and establish relationships between magnetic flux, EMF, the geometry of electric and magnetic circuits, the structural arrangement of electric windings, and circuit solutions of an automatic electromagnetic excitation system for the design of a new type of generators. The current issues of the effective use of an exciting magnetic flux for voltage regulation in power supply systems powered by power plants, the main generators of which contain a distributed magnetic system with concentrated electric windings, are considered. The optimal structural compositions and geometry of the ratios of electric and magnetic circuits are determined from the machine's basic calculation equation, which is obtained under the condition of maximum magnetic flux. The reasons for the induction of variable EMF in the DC excitation windings, which prevent the effective magnetization of the machine, have been established. The location of the electric windings is proposed, which makes it possible to weaken or completely compensate for the pulsations of the magnetic flux coupled with the exciting circuits. It is established that in order to eliminate parasitic EMF in the exciting windings, it is necessary to use two-circuit circuits for alternating switching of the magnetic flux in the circuits, with sequential activation of the sections of the windings of the exciting circuits. To completely eliminate these EMFs, performing two-circuit magnetic flux switching circuits with a common exciting winding is advisable. The methods and features of the circuit implementation of the conditions of electromagnetic excitation and maintenance of voltage constancy at the output of generators of a new type are considered.

Оптимизация перевозок термочувствительных грузов в рефрижераторных контейнерах с применением альтернативных источников энергии

Purpose: to consider the main problems of transportation of temperature-sensitive cargoes in refrigerated containers (refcontainers). To show the possibilities of transportation optimization through the introduction of alternative energy sources. Methods: comparison of technical and economic indicators of diesel, hydrogen and hydrogen plants is carried out. The exergetic method of estimating the effect of replacing diesel fuel with LNG was applied. Results: the article defines the peculiarities of cargo transportation in containers with built-in refrigeration units — autonomous refcontainers. Classification of existing energy units for power supply of refcontainers is given. The design of an autonomous installation for power supply of refcontainers is described. Environmentally safe alternatives for providing autonomous power supply of refrigerating units of refrigeration containers are proposed. The advantages of autonomous power supply based on high-temperature fuel cells are presented. An autonomous power unit with liquefied natural gas (LNG) as fuel is described. The feasibility of utilization of cold from LNG regasification is analyzed in order to ensure the stability of refcontainer operation. The estimation of the expected effect from the use of alternative fuels for autonomous power supply is made. Practical significance: the obtained results can be used for modernization of low-capacity power plants used in refrigerated and other types of transport.

Evaporator with horizontal water plane stabilization

Evaporation plays an important role in maintaining water balance and managing water resources in reservoirs. This problem is relevant in hot regions with a lack of fresh water. In addition, reliable operation of evaporators plays an important role in preventing overheating and ensuring safe cooling of reactors which is critical to maintaining nuclear safety. The complete control and accurate measurement of the evaporation process provided by the developed device enables efficient water management ensuring the stability of nuclear power plants and minimising environmental risks. Evaporators are used to control the evaporation process in reservoirs. Based on the analysis of existing evaporators and their shortcomings, an evaporator with horizontal plane stabilization in the pan is developed. Due to this function the developed device allows to control the evaporation process with higher accuracy by reducing fluctuations in the water level in the evaporator. The developed device contains an autonomous power supply that uses energy-saving technology based on a solar battery which ensures operation without additional sources. The use of such a power supply increases the evaporator reliability. One of the important advantages of this device is the use of a cellular-based information transmission channel to the control center which allows to transmit the results of evaporation quickly monitoring and make water management decisions accordingly. In addition, the use of a GPS navigation system allows to set or determine the coordinates of the evaporator installation in the reservoir accurately. The developed device can be included in an intelligent energy resource management system; its use will significantly improve the safety and sustainability of nuclear power plants by improving evaporation process control. It will also optimize the nuclear power plants operation, promote efficient management of water resources and ensure safety in the nuclear energy field.

Dependability of local power systems based on autonomous generation units

Aim. The paper aims to create and verify methods for predicting the dependability of autonomous power supply to local low-power consumers. Methods. The work uses simulation tools, i.e., computational experiment for predicting the dependability and safe service life of autonomous cluster distributed energy networks that include various power generation installations, power transmission lines and an automated self-regulation system for the purpose of diversifying the risks of failure. Results. Using methods of probabilistic analysis of technical system safety, the dependability of power supply is predicted in terms of possible energy network failures and threats to the life of consumers. The problem can be solved by simulating and predicting the moment of failure of a power network, i.e., critical violation of design conditions, accident, etc. This scenario allows – for long periods of operation – simulating failure situations due to degradation and destruction of elements, units, power lines, as well as failures under multidimensional uncertainty of prediction of dependability and quality of power supply. The key output of simulation is a set of recommendations to ensure energy security. The paper presents simulated dependability indicators, analysis of the effect of structural design solutions underlying a distributed energy network on the dependability and energy security. Conclusion. The use of computational experiments and results of power supply dependability simulation as part of predicting probabilistic indicators of failures of equipment and elements of cluster energy networks, identifying their consequences for the energy security of sparsely populated and remote locations lays the foundation for quality management of energy networks. Additionally, in the future, additional causes and initial events may be included in the model for the purpose of studying the facts of failures. For instance, such causes as uneven generation using renewable sources, finite fuel supply for conventional generation sources, reliability of the power grid personnel. The proposed approach allows verifying promising new energy network design solutions, for example, including energy storage systems into a distributed energy network that – at various points in time – may be either “generators” or “consumers”. Simulation of local energy networks is of practical interest and is important for improving their consumer quality, resistance to hazardous environmental effects.

Boosting energy harvesting of fully flexible magnetoelectric composites of PVDF-AlN and NiO-decorated carbon nanofibers

The increasing popularity of wearable electronics has sparked interest in flexible energy harvesters as alternatives to conventional batteries. Flexible magnetoelectric (ME) composites, known for converting ambient magnetic field energy into useable power, are emerging as promising autonomous energy sources for integration into wearable devices. In this study, we prepared flexible (PVDF-AlN)–(NiO–CNF) based ME composites using two different methods: solution-casting and electrospinning techniques. The ME coupling was confirmed by measuring the ferroelectric and magnetic properties of the composite, and it was qualitatively characterized through the ME coupling coefficient. The electrospinning fibers-based ME composite exhibited an optimal value of 10.6 V/cm.Oe, significantly higher than the solution-casting films-based ME composite (1.3 V/cm.Oe) under a 1 kHz AC magnetic field (off-resonance condition). Subsequently, a flexible magneto-mechano-electric (MME) generator was designed using electrospun-derived material, harvesting a sinusoidal wave with a maximum output peak-to-peak voltage of 9.02 V. The generator displayed an optimal DC power density of 97 μW/m2 when exposed to a weak AC magnetic field of 6 Oe at a frequency of 50 Hz. Consequently, it holds great promise as an efficient autonomous power supply for medical sensing and various miniature electronic applications.

Automatic Electric Vehicle Charging Station

Our Automatic Electric Vehicle Charging station is a autonomous power supply unit which works without the need for human attendants. The system is designed to facilitate the existing power grid infrastructure. The system employs the Raspberry Pi as our primary controller board and hosts the User Interface on the LCD Display mounted on the Charger Housing. The Pi Board interfaces with our custom Pilot PCB to communicate with the Electric Vehicle Battery Management Systems to negotiate the charging speed, capacity of the car battery and perform safety checks. The user can choose AC level 1, 2 or DC level 3 charging. The system uses a 30A relay circuit to isolate the battery from the power supply until all the necessary checks and payment processes are completed. RazorPay is our real time Payment gateway for payment transactions. Once the user has completed the formalities the charging process will begin. We also have a charging monitoring system developed that will help users track the battery charge percentage and charging time remaining on the LCD display. The station has emergency Kill Switches and Emergency Stop buttons mounted on the housing to address safety concerns that arise on the advert of damaged high power output utilities, when engaged the entire system will kill all the power inputs from the grid so that any fault can be safely repaired without risk of electrocution. For our implementation and testing we have built a 18650 NMC chemistry 3S5P Battery pack with a 3S BMS. The unit utilizes level 3 AC charging SAE (Society of Automotive Engineering) standards to ensure the safety and quality of the service.

РОЗРОБКА СИСТЕМИ КЕРУВАННЯ ЕЛЕКТРОПОСТАЧАННЯМ В УМОВАХ ОБМЕЖЕННЯ ПОТУЖНОСТІ

Abstract. The article considers the problem of efficient distribution of electricity under conditions of limited production capacity. The specifics of production and energy consumption of various industries and classes of consumers are studied, which allows taking into account their needs and ensuring optimal distribution of electricity. Over the past decades, there has been an increase in demand for electricity in industry, the economy and the population. At the same time, existing sources of electricity generation may be limited in capacity, which leads to a situation where insufficient power cannot satisfy all consumer needs. The article presents an analysis of various methods of power supply management, including traditional and innovative approaches. The advantages and disadvantages of each method are discussed, and the author proposes his own control system that combines the best aspects of different approaches. The main results of the study are the development of an efficient power supply management system that ensures optimal distribution of electricity among different categories of consumers. The use of this system will reduce electricity losses and ensure a stable electricity supply for all consumers. In today's environment of technological development and growing electricity consumption, there is an urgent problem of optimising the management of limited sources of electricity supply to different categories of consumers. Solving this problem will help to increase the reliability and efficiency of electricity supply, as well as ensure the balanced operation of the system of conditionally limited electricity sources in the face of diverse consumer needs. Further research could consider the possibility of implementing the proposed power supply management system in practice and evaluate its effectiveness. Additional research can also be conducted on the impact of various factors, such as changes in electricity demand or increased production capacity, on the operation of the control system. Overall, this paper is an important contribution to the development of power management systems. It proposes a new approach to electricity distribution that allows for optimal resource utilisation and reduces energy losses. The results of the study may be useful for energy specialists and developers of power supply management systems. Keywords: autonomous power supplies, uninterrupted power supply, optimisation of energy consumption, renewable energy sources, power supply control system.

Peculiarities of the Operation оf Optical Communication in case of emergencies

Today, in connection with the beginning of the full-scale armed invasion of the RF on the territory of Ukraine, questions related to fire safety and stable electricity supply have arisen before our state. It. in turn, led to numerous problems in the communication system. Against this background, after damage to power supply lines and strategic objects, the search and deployment of power supplies independent of the usual supply sources became urgent. After all, under the conditions of emergency and planned power outages, only the presence of such means of power supply as fuel generators and batteries make it possible to provide work and training for a huge number of people. Thanks to the fact that people, without wasting time and wasting energy on unnecessary things and affairs, began to work on the issue that is associated with a sudden or planned power outage for known or not entirely known reasons, work for most people resumed. Autonomous power sources were fuel generators. Small shopping centers and shopping and entertainment centers have installed powerful diesel generators on their premises to power large premises. Some installed one diesel generator on each individual wing. This was done if the room was too large for one diesel generator. Small establishments, for example: cafes, restaurants, bars, pubs, hookah bars, small offices, offices, workshops, etc. installed gasoline generators if the premises were the size of a garage, a three-room apartment with an area of 92 m2 or the size of a small two-story country house with walls 8 meters long each and ceilings up to 2 meters high. Powerful diesel generators were installed in the premises, which were more than 100 m2 in area. Most generators had an automatic start feature. Some generators had an installed automatic start function, and some did not have this function, and therefore had to install this function separately. Telecommunications companies and mobile communication service companies and provider companies that sell and service cable Internet also did not waste time and effort and also installed generators on their territories. Provider companies and mobile communication service companies were the first to decide to install autonomous emergency power supplies in their territories. This was done on purpose, since the equipment that provided and monitored wireless and cable Internet services and mobile communications services was powered by network electricity, and during the absence of network electricity, the equipment obviously stopped working. Because of this, cable Internet and mobile communications were lost, which had a negative impact on some citizens of Ukraine. It had a negative impact on them, since some citizens, as mentioned above, could work or study remotely. Someone lost their job, someone lost their business due to power outages. Also in connection with this, huge accounting gaps appeared. The introduction and use of emergency power helps solve this problem.

СОЛНЕЧНЫЕ ЭНЕРГЕТИЧЕСКИЕ СИСТЕМЫ ДЛЯ ЧАСТНЫХ ПОТРЕБИТЕЛЕЙ

Currently, there is an increased interest in the use of combined autonomous power supply systems based on renewable energy sources in the world. Private consumers of the agro-industrial sector need both electric and thermal energy, while installations should not occupy significant land areas. (Research purpose) The research purpose is substantiating the use of photovoltaic systems of increased efficiency for operation in small installations used for private households and farms of the agro-industrial complex. (Materials and methods) Proposed to use a control system based on maximum power point tracking (MPPT) controllers and silicon elements of increased efficiency for more efficient operation of the entire power complex. (Results and discussion) It have been shown that when equipping an autonomous consumer with power plants, reliability and uninterrupted operation of power systems, as well as the necessary power characteristics, become important. It was determined that the daily operation time of such systems is limited by solar insolation and low radiation flux density. It has been established that for the uninterrupted operation of these systems, a reserve of energy or additional power sources is required, and taking into account the variability of solar activity, their conversion factor should be increased by combined generation of thermal and electrical energy. It was found that the modification of the surface of photocells with silver nanoparticles leads to an increase in power characteristics by 20 percent due to the initiation of the effect of surface plasmon resonance. (Conclusions) It was stated that installations for power supply to autonomous consumers of both the agricultural and municipal sectors based on renewable energy sources (in particular, solar installations), modeled using these methods and technologies, make it possible to effectively provide private consumers of the agro-industrial sector of the economy with thermal and electric energy, and when using combined energy conversion, reduce the occupied areas in calculated per unit of power.