Power Supply Source Research Articles

Use of low-temperature plasma for stabilizing a combustion process under the utilization of waste products with high moisture content

Thermal recycling and disinfection of waste products in different physical states represent a comprehensive solution to the problem of waste utilization. The utilization of waste materials with high moisture content (more 70…75%) is associated with a need to evaporate a significant volume of water and causes, as a consequence, substantial additional expenses on an energy source. To cut costs related to the utilization of wastes with a high amount of water it is suggested using a coal cleaning product – a coal-water slurry fuel. The direct combustion of incompletely mechanically dehydrated (to 70-75%) wastes with high water content (cake) is an economically efficient process. However, it poses a severe problem of combustion stabilizing. The paper presents outcomes of the research into the stabilization of thermal recycling waste materials with a high level of moisture by means of low-temperature plasma in the adiabatic vortex combustion chamber. To control a burning process in the technology adapter low-temperature plasma is supplied into the base of flame. An output of a plasma generator (power supply source) is estimated as 1 kW power input per 13 kg/h suspension fuel. A dynamic range of heat output for a coal-water slurry fuel and wastes is determined to be 70-100% when generating thermal energy and utilizing wastes with high moisture content by means of low-temperature plasma as a stabilizer of a combustion process. Experimental studies carried out on a machine simulator have proven the efficiency of low-temperature plasma for utilization and disinfection of waste products in commercial farming.

Ways to improve the energy efficiency of renewable energy sources

The ways of increasing the energy efficiency of the use of renewable energy sources are considered. The descriptions of universal energy complexes that simultaneously use converters of various types: solar rays, wind flows into electrical energy, patented at SKGMI (GTU) are given. The prospect of using renewable energy sources for autonomous power supply of objects in mountainous regions has been substantiated.

The assesement of the shunt active filter efficiency under varied power supply source and load parameters

The results of theoretical and experimental studies on the problems of effective application of shunt active filters for power quality improvement and electromagnetic compatibility ensuring were presented in this article. Based on the different theories and methods, the most effective and well-studied control algorithms of shunt active filters were determined and analyzed to ensure their effective application in distributed generation systems and combined power supply systems. Mathematical and computer simulation models of shunt active filters with different control algorithms in distributed generation systems and combined power supply systems were developed. According to the results of mathematical modeling and computer simulation, the dependences were detected, reflecting the influences of internal and external parameters on the factors, determining the efficiency of the correction of power quality indicators. The range of permissible changes in the parameters of shunt active filters by saving the required efficiency level of power quality correction was detected under varied power supply system characteristics, load parameters and also in hybrid structures. The adaptive algorithm of the shunt active filter functioning under varied application conditions for automated power quality improvement is developed on the basis

Beamforming and Resource Allocation for Multiuser Full-Duplex Wireless-Powered Communications in IoT Networks

For a self-sustaining wireless communication system in the Internet-of-Things (IoT) networks, energy harvesting (EH) can be implemented at each user node as a constant renewable power supply source. Hence, an investigation into the use of wireless-powered communication network (WPCN) protocols to facilitate communication between an access point (AP) and multiple mobile users (MUs) is presented in this article. The AP has multiple antennas and operates in the full-duplex (FD) mode. The MUs, on the other hand, have single antennas and works in the half-duplex (HD) mode. Each MU communicating with the FD-AP is assigned to one of two groups, based on the time allocation and channel access for either uplink (UL) or downlink (DL) communication. The channel assignment, time resource, and power resource allocations are optimized to maximize the UL weighted sum rate. The sum-rate optimization problem is found to be nonconvex. Therefore, an iterative algorithm is investigated to optimize the UL weighted sum rate of the proposed FD-WPCN system. Next, the proposed FD-WPCN algorithm is modified for HD-WPCN-enabled communication between the AP and multiple MUs. Extensive simulations are conducted to verify the proposed algorithm for FD-WPCN and compare its performance with the HD-WPCN counterpart. From the simulation results, FD-WPCN outperformed HD-WPCN at a low AP transmit signal-to-noise ratio (SNR) region. The opposite behavior is observed for high AP transmit SNR due to increasing residual self-interference at the FD-AP.

Pattern Recognition of Optical Fiber Vibration Signal of the Submarine Cable for Its Safety

Submarine cables are the main sources of power supply for oil rigs; in this regard, they must be assessed and effectively secured. Monitoring of the environment of submarine cables is rare, and cable faults generally require interventions. This article develops the detection and recognition of shock events on submarine cables using the vibration signals of its optical fiber sensor. The vibration signals from the optical fiber are detected by means of phase-sensitive optical time-domain reflectometry ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\Phi $ </tex-math></inline-formula> -OTDR). An effective fiber vibration pattern recognition scheme based on the time-frequency-domain characteristics (TFDC) and Support vector machine (SVM) is proposed. The scheme uses the TFDC for the recognition of the fiber vibrations, and the SVM to determine the magnitude of the event. Three different groups of data are collected and processed in real-time. Experimental results from multiple tests carried out on data samples show that the proposed method is valid and reliable for recognizing and determining the magnitude of events on the submarine cable.

An Express Methodology for Calculating the Reliability of Power Supply Systems with Autonomous Power Sources

Autonomous power sources are widely used in systems for power supply to industrial facilities, especially in the oil and gas industries that have affordable energy carriers. These sources can be used both separately and in combination with centralized power supply, as primary, backup, or emergency sources. Their operation is characterized by the features that affect power supply reliability and must be taken into account when deciding on their use in the stages of designing new power supply systems or modernizing existing ones. The use of methodology and software for calculating the reliability of systems with autonomous power sources in the stage of pre-project research can contribute to more informed decision-making. In this stage, there is no need and opportunity to consider all reliability issues in detail. Here, express methods are enough to take into account the main features of the systems functioning with autonomous or mixed power sources and to compare the proposed system options within a single methodological framework. Based on this, a methodology was developed to calculate the reliability of power supply systems with autonomous and mixed power sources. The proposed methodology employs semi-Markov random processes (Markov chains) and can be used in comparative reliability analysis of power supply options with autonomous and mixed power sources. It was implemented in software and is accompanied by an example of reliability calculation for power supply to a stationary platform for maintaining reservoir pressure in an offshore oil field.

Enhancing Instructional Delivery in Nigerian Technological Institutions Through the Use of Solar Powered Printing Plate Burner

The problem of erratic power supply and load shedding of electricity has become a major obstacle preventing educational, industrial and economic development in Nigeria. Despite published efforts of previous and present government to eradicate the scourge, it has refused to go into extinction instead new dimension to the problem keeps unfolding. Consequently, different sectors of the economy that depends on electricity as a source of power supply are either going underground or operating below capacity. The educational sector is not spared from this epidemic; instructional delivery is adversely affected as training equipment that needs electricity to power their electrical motors can only perform below expectation. There is need to think out of the box; joining the global trend to adapt to cleaner and renewable energy. This study examined the use of solar powered printing plate burner in training students of visual art departments in Nigerian tertiary institutions as a means of enhancing instructional delivery. With the tremendous improvement enjoyed as a result of powering printing plate burner with solar energy during training, it was recommended that other training equipment should be fabricated or manufactured to be solar compliant. Keywords: Solar energy, Training equipment, Instructional delivery. DOI: 10.7176/JNSR/11-22-03 Publication date: November 30 th 2020

Modelling of electric drive of vibration exciter

The authors investigate whether it is possible to improve the models of the electric drives of vibration sources using Matrix Laboratory Simulink. The test subject is the simulation model of the electric drive of a borehole vibration exciter based on a linear double-acting electromagnetic machine. The simulation model consists of the power and control subsystem of the electric drive. This model allows the wide-range parametric analysis of processes in the electric drive by the computer modelling methods. The oscillograms of voltages and currents are obtained in the case of the electric drive control by the piston position for real-life and ideal sources of power supply. The oscillograms are compared, and the calculation error is estimated.

Communication technology of crisis management in conditions of mass disruption of power supply in the period of «ice rains»

A technology is presented for crisis management and handing reputation and image consequences for the JSC IDGC Holding power company in connection with the man-caused accident of 2010 – 2011 (the most extended and painful for power supply of the Russian population), which occurred under the impact of a natural factor in the form of "ice rain" on power transmission engineering systems. Based on the results of a comprehensive analysis of the PR situation, the nature of the crisis has been revealed, which, in terms of its geographical scale, the extent of mass outages of consumers from power supply sources, and the scope of repair and restoration work, was unprecedented in the Russian Federation over the previous 30 year period. It is estimated that the restoration of performance of the electricity network infrastructure took three months (January through March of 2011) and involved huge information and communication resources, mobilization of staff and additional pool of specialists with a total number of more than 3 thousand people. The research methodology is consistent with conventional boundaries, with a full set of approaches typical of research of a systemic social phenomenon, such as the company's communication activities and in interfacing with the essential characteristics of business reputation. As a hypothesis, a convincing and proven assumption has been put forward that mass disruptions of power supply under the influence of natural elements can become a decisive factor for a fundamental shift in public opinion in favor of the power grid company, if the crisis PR program is based on creative ideas for the involvement of journalists, experts, environmentalists, deputies, other stakeholders and opinion leaders in the process of emergency response. By way of example of analysis of communication work in conditions of mass power supply disruption in the zone of responsibility of JSC IDGC Holding, a system of recommendations is suggested for the PR service activities during the crisis period.

A Piezo Smart‐Braid Harvester and Damper for Multifunctional Fiber Reinforced Polymer Composites

The past decade has seen the rapid development of wearable electronics, wireless sensor networks (WSNs), and self‐powered implantable sensors. However, these devices usually require a continuous source of power supply to operate safely and accurately while having the least reliance on conventional battery systems—due to the recharging/maintenance burdens of batteries. Vibration‐based piezoelectric energy harvesting (PEH) from environment, man‐made machinery, and human body movements seems to be a promising solution. Herein, the first integration of a piezoelectric poly(vinylidene fluoride) (PVDF) yarn‐braid microgenerator into a fiber reinforced polymer composite (FRPC) structure is reported. It is demonstrated that the developed smart composite exhibits multifunctional performances, including simultaneous structural (with ≈10% increased Young's modulus), energy harvesting, and vibration damping (with a damping factor of 125%). The results show that an average output voltage of 3.6 V and a power density of 2.2 mW cm−3 can be achieved at strains below 0.15%, under cyclic loading tests between 1 and 10 Hz. Moreover, noticeable improvements are made in the crystallinity percentage and β‐phase content of as‐received PVDF yarns by, respectively, ≈34% and ≈37%, as a result of the applied coreless radial and axial corona poling techniques.

Cold Ironing Galvanic Corrosion Issues with Regard to a Shore-to-Ship Medium Voltage Connection

Cold ironing refers to the usage of less polluting power supply sources to deliver electricity to the moored ship. Such a shore-to-ship system is used when the ship is at a port so the auxiliary combustion engines may be turned off. This paper presents the numerical simulation results of a medium voltage cold-ironing system with regard to the currents flowing between the ship’s hull and grounding busbar. The IT electrical inland system with a neutral grounding resistor, as commonly used in shore-to-ship systems, is investigated. Parasitic capacitances present between the phase-to-hull and phase-to-ground in real-world applications can vary from each other. The direct and alternating currents flowing across the hull, seawater and the pier structure are amongst the causes that can lead to premature reinforced concrete degradation. Chosen cases of phase-to-ground or hull unequal capacitances influencing AC stray currents were considered.

Selection of Best Power Supply Source for Telecom Towers in Remote Areas

Installation of telecom towers in remote areas especially in developing countries like India is a major problem for telecom industries because of the unavailability of reliable power supply. The grid supply is not regular in these countries and up to some extent, they are dependent on diesel generators for power supply. But these diesel generators have some major issues such as high operating cost due to high cost of fuel, transportation cost of fuel, high maintenance cost, and these diesel generators also emits pollution to the environment. In presented work, an approach has been proposed for telecom companies for providing power supply to their telecom towers. An economic cost analysis has been proposed by considering various criteria such as cost, air &amp; noise pollution and reliability, etc. Some power supply alternatives including unconventional and hybrid of conventional and unconventional alternatives have been compared to find the solution such as diesel-powered telecom towers, solar powered telecom towers, and their hybrids. The main objective of this work is to provide a reliable, cost effective and environment friendly Remote Area Power Supply (RAPS) system for a particular site in India (Uttar Pradesh). A number of criteria are involved in discussed problem in order to select an effective power supply source. Therefore, the problem has been considered as a Multi Criteria Decision Making (MCDM) problem. To select the best alternative, a Fuzzy AHP and TOPSIS based approach has been proposed. Fuzzy AHP (Analytic Hierarchy process) has been used for calculating the weightage of criteria and the concept of Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) has been applied for ranking the alternatives. The results give assured reliability and sustainability for remote areas using a solar photovoltaic (PV)-diesel generator hybrid energy system.

Use of photovoltaic converters in electrochemical protection systems for underground pipelines

Currently, electrochemical protection of pipelines is provided by cathodic protection stations, which receive electric energy from power lines laid along the pipeline route. The construction and installation of facilities that ensure the transmission of electricity from centralized sources to locations of cathodic protection stations and the conversion of its parameters to the required level is characterized by significant capital costs. In recent years, there has been a leap forward in the development of alternative energy sources, which allows us to consider them as sources for power supply of cathodic protection stations. This paper describes the possibility of using photovoltaic converters to power cathodic protection stations. In addition, an implementation scheme was proposed and analyzed.

Structural and electrochemical properties of LiNiO2 cathodes prepared by solid state reaction method

LiNiO2 samples have been prepared by solid state reaction method at different annealing temperatures. Structure of the samples clearly shows that the sharp peak is observed at (0 0 3), which indicates the fcc lattice. The morphological surface of the samples and the grain size of the integrated oxides have been analyzed by SEM. The chemical complexation of the molecules is confirmed by FTIR studies. From the optical absorption results the bandgap of LiNiO2 has been observed at 1.20 and 1.40 eV, respectively. Raman band observed at 590 cm−1 is due to the symmetric O–Ni–O stretching vibration of NiO2 units. The sample which is prepared in the form of cell is measured galvanostatically in the potential territory 2.75–5.1 V. The cyclability of the prepared sample is displayed over 30 cycles. The thickness of the cell is found to be 198 𝜇A cm−2. The discharge capacity for both the samples have been calculated, and it is found out that for the annealed sample at 1450 °C shows more cyclic performance up to 325 mAh g−1, whereas the annealed sample at 1100 °C shows up to 270 mAh g−1. The obtained results have revealed that the LiNiO2 cathode material annealed at 1450 °C may be utilized in the preparation of microbatteries and also in other power supply source applications.

Hydrogen-Oxygen Installations for the Energy Industry

The review analyzes the main types and designs of hydrogen-oxygen facilities: steam generators, superheaters, and various power air heaters. The main problems arising in the development, creation, and testing of such installations are identified. They include the cooling of the most heat-stressed units, the mixing and carburetion of the main fuel and oxidizer components, the mixing of high-temperature combustion products and ballasting components, and problems associated with the completeness of hydrogen combustion and operational safety. The main areas of these facilities application in the stationary and the energy industry are considered: maneuverability and increased efficiency in power facilities with the steam turbines, energy-storage systems with the renewable energy sources for autonomous power supply, etc.

Smart grid and ripple control technologies in energy and road construction

The present paper is aimed at studies on innovational technologies of Smart Grid and Ripple Control, which offer means for intuitive integration of actions of all consumers of energy resources to provide sustainable, effective and reliable sources of power supply in road construction. Operating features of the Smart Grid system were analyzed in terms of its ground-breaking aspects and advanced methods for monitoring. These systems combine novel products and services with intelligent systems for monitoring, control, communication and self-restoration. Regarding the results of the research, there were given recommendations on how to reduce losses in transmission lines, improve operational stability and productivity of the grid without any technical modifications in the network.

Automatic Controller for Teleoperated Switching between Multiple Energy Sources in a Residential Building Nanogrid

Erratic power supply from the utility grid has grave effect of the development of several countries. In a bid to overcome this challenge, many residential buildings have become electrically self-sustaining by the integration of various backup power supply source. Yet the act of transition from one source to another has remained a manual task that tends to discourage users from going through the rigour. Internal combustion engine AC generators and batteries have been found to be the most common backup options. An automatic transition system that gives user the flexibility of monitoring and controlling resources remotely from a mobile phone application is thus presented in this paper. The microcontroller-based system monitors the status of the energy resources and protects the building against undervoltage or overvoltage conditions. Based on the state of charge of the battery and the fuel level in the generator, the system activates the appropriate alternative backup source in the event of an outage form the grid supply. This system affords users a new level of comfort and reliability of power supply, as in the automatic mode, the users are guaranteed power supply with minimal downtime, except when all resources are unavailable. Keywords: Automatic Transfer Switch, Nanogrids, Remote Monitoring and Control DOI: 10.7176/ISDE/11-5-03 Publication date: September 30 th 2020

INDEPENDENT ELECTRICITY SUPPLY TO LIVESTOCK FARMS BASED ON RENEWABLE ENERGY SOURCES

The paper analyzes the energy potential of autonomous power supply based on renewable energy sources in a livestock farm. Based on calculations of the amount of farm waste that act as raw materials for a biogas power plant, the amount of electricity that can be produced from biogas has been determined. The value of electricity generation was also determined when a biogas plant and solar panels are used together in order to fully cover the need for electricity. It has been established that the use of renewable energy sources for autonomous power supply has significant potential for growth, in particular, the generation of electricity by a biogas power plant is calculated according to the minimum indicators for a cattle farm, provides 57% of the required electricity, in addition, there is also thermal energy, which is used for heating farms. The combined operation of the biogas plant and solar panels installed on the roof of the farm allows to cover the need for electricity with a reduction factor of 2.6 solar panels generation. The use of biogas obtained from the waste of a cattle farm and together with solar panels makes it possible to cover the need for electricity with a significant reserve. For a typical farm of 100 cattle, this stock is about 80%. The use of which is possible with the use of energy storage devices and the formation of a biogas reserve. It has been established that the electrical power of a biogas plant, which works in conjunction with solar panels, should be at least the average value of the power consumption to provide autonomous power supply to consumers of the livestock farm, especially in the winter months when solar insolation is minimal.

Analysing the reasons of the inadequate performance for small sewage treatment plants in the Far North

The development of natural resources in the Far North is constrained by the water factor, because intensive use of water resources by the extractive industry enterprises is associated with expenditure, losses, water pollution. As a result, it has a significant impact on the state of the hydrosphere and all other components of the environment. Discharge of untreated and insufficiently treated wastewater into surface water bodies by camp settings constantly worsen their condition. Wastewater is contaminated with phosphorus, nitrogen, all kinds of bacteria, it can also contain viruses and helminth eggs, and it contains large quantities of synthetic surfactants, which are formed after bathing, washing and laundry on the camp settings of the extractive industry enterprises. Wastewater flow rate is 1400 m3/day in the camp settings. However, the degree of toxicity of water-discharge is no less than that of large cities. The characteristic features of wastewater from camp settings and sewerage systems are: remoteness from sources of centralized power supply, water supply and sewerage (isolated location); the interruptions in the supply of wastewater to structures and a low population density (up to 70 people/ha); increased concentrations of contaminants because of the relatively low standards of wastewater disposal (depending on the degree of buildings improvement). Thus, small sewerage treatment facilities are complex, difficult-to-control biological systems operating in an unfavorable mode of a constantly changing composition of wastewater. It should be noted that the published information on the topic of domestic sewage wastewater treatment has a limited scope, due to the specificity of the qualitative and quantitative characteristics of wastewater, natural and climatic conditions, and other factors. The work considers the treatment facilities of the Chukotka Autonomous District of the Far Eastern region of Russia (the Far North region), the microbiological composition of wastewater was studied, which is formed in especially unfavorable conditions (the Far North region), the conditions for the biocenosis formation and the reasons negatively affecting the biocenosis.

Power Guarantee for Electric Systems Using Real-Time Scheduling

Modern electric systems, such as electric vehicles, mobile robots, nano satellites, and drones, require to support various power-demand operations for user applications and system maintenance. This, in turn, calls for advanced power management that jointly considers power demand by the operations and power supply from various sources, such as batteries, solar panels, and supercapacitors. In this article, we develop a power scheduling framework for a reliable energy storage system with multiple power-supply sources and multiple power-demand operations. Specifically, we develop offline power-supply guarantee analysis and online power management . The former provides an offline power-supply guarantee such that every power-demand operation completes its execution in time while the sum of power required by individual operations does not exceed the total power supplied by the entire energy storage system at any time; to this end, we develop a plain power-supply analysis as well as its improved version using real-time scheduling techniques. On the other hand, the latter efficiently utilizes the surplus power available at runtime for improving system performance; we propose two approaches, depending on whether future scheduling information of power-demanding tasks is available or not. For evaluation, we perform simulations to evaluate both the plain and improved analyses for offline power guarantee under various synthetic power-demand operations. In addition, we have built a simulation model and demonstrated that the proposed framework with the offline analysis and online management not only guarantees the required power-supply, but also enhances system performance by up to 56.49 percent.