Journal articles on the topic 'Local power supply system'
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Opryshko, V. P. "POWER SUPPLY MODE CONTROL IN THE LOCAL MICROGRID SYSTEM." Tekhnichna Elektrodynamika 2016, no. 4 (June 14, 2016): 77–79. http://dx.doi.org/10.15407/techned2016.04.077.
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Byk, Felix, Yana Frolova, and Ludmila Myshkina. "The Efficiency of Distributed and Centralized Power System Integration." E3S Web of Conferences 114 (2019): 05007. http://dx.doi.org/10.1051/e3sconf/201911405007.
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The existing centralized power supply system has the alternative due to distributed generation. By certain conditions distributed cogeneration allows to increase the reliability and quality of power supply and to reduce the cost of electricity for consumers. Therefore, a lot of energy-intensive consumers switched to their own power supply systems, as it turned out to be a competitive technical solution. The total gasification of the country’s regions and the presence of domestic manufacturers of gas turbine and gas piston power plants accelerated this process. Nowadays local power systems are emerging with cogeneration plants are the main source of heat and electricity there. The feasibility justification of the kind and type of generation is determined by many factors, including circuit-mode parameters in the local power system and adjacent network. Local power systems based on the principles of self-balance are proposed to name as energy cells. The integration of energy cells with regional power system increases the technical and economic effectiveness of power supply system for consumers. The proposed power systems transition leads to certain systemic effects. Received effects are depending on functions of distributed generation. This paper explores the impact of scheme and mode factor on the technical effects.
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Udalov, Sergei, Andrei Achitaev, Boris Bochenkov, and Alexandr Pristup. "Adjustability of wind powerinstallation in a local power supply system." Energy-Safety and Energy-Economy 3 (June 2017): 33–40. http://dx.doi.org/10.18635/2071-2219-2017-3-33-40.
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Dudnikov, Sergij, Oleksandr Miroshnyk, Stepan Kovalyshyn, Vadym Ptashnyk, and Krzysztof Mudryk. "Methodological aspects of evaluating the effectiveness of using local energy systems with renewable sources." E3S Web of Conferences 154 (2020): 07013. http://dx.doi.org/10.1051/e3sconf/202015407013.
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A method is presented for justifying the construction of a mathematical model of the process of supplying consumers from local sources, taking into account deterministic input information. The target function of the mathematical model is to minimize financial investments in the construction and operation of the local energy supply system using renewable energy sources. Presented activities are aimed at assessing the efficiency of use of fuel and energy resources by local power supply systems, determining the conditions for a positive economic effect, substantiating the composition and main technical parameters of power plants and devices of the local power supply system. At the same time, the conditions of competitiveness of the local power supply system relative to the centralized one should be observed. Sources of local power supply systems should be built on the basis of biogas plants that are capable of producing biogas with long-term storage in gas storages and at the same time are energy storage batteries for other renewable sources. The presented analysis of the energy balance of a biogas plant, taking into account the synergistic effects of interaction between centralized and local energy systems, will make it possible to make optimal decisions for creating a bioenergy complex.
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Lezhnyuk, Petro, Iryna Hunko, Juliya Malogulko, Iryna Kotylko, and Lіudmyla Krot. "MODELING OF COMPATIBLE WORK OF DISTRIBUTED POWER SOURCES OF ELECTRIC POWER AND CENTRALISED POWER SUPPLY." TECHNICAL SCIENCES AND TECHNOLOG IES, no. 2 (12) (2018): 189–95. http://dx.doi.org/10.25140/2411-5363-2018-2(12)-189-195.
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Urgency of the research. Current trends of distributed generation development in Ukraine indicate a rapid generation in-crease from renewable energy plants. Most developed countries gradually refuse from the fossil fuels use and invest more and more to the “green” energy. Therefore, there is a need for a detailed study of the operation conditions of distributed energy sources due to their instability, as well as the processes that arise in distribution electric networks with diverse types of distributed energy sources. Target setting. In the producing process of power energy by distributed energy sources due to the increase in their num-ber, there are situations where several renewable sources of energy operate to only one system of buses. Thus, such distributive networks acquire the features of a local power system, which complicates the control process of such systems, and also there is a problem with the electricity supply of consumers. Actual scientific researches and issues analysis. The analysis of publications suggests that in literature more attention is paid to studying the operating modes of solar power plants, or small hydroelectric power plants. However, almost no attention was paid to the study of their cooperation work. Uninvestigated parts of general matters defining. Only a few works are devoted to the study of the cooperation of the diverce sources of distributed energy sources in the local electrical systems. That is why, their impact on power distribution networks and on the grid in general has not been studied extensively. The research objective. In this article was considered the influence of asynchronous generators on small hydroelectric power plants on the operation modes of distribution electrical networks, and were investigated the processes that are occurring in local power systems with different types of distributed energy sources. The statement of basic materials. Based on the research results, was developed a computer model of a such system in the PS CAD software environment. Two solar stations and one small hydroelectric power station with an asynchronous generator were connected to the power supply. It was shown the simulation of two modes of operation: a joint operation of a small hydroelectric power station, two solar power stations and a power supply center; a joint operation of a small hydroelectric pow-er plant, two solar power stations and a power supply disconnected. Conclusions. As a result of computer simulation, it is shown that by switching on a small hydroelectric power plant with an asynchronous generator in the case of an emergency shutdown of centralized power supply, it is possible to restore the work of solar power plants, and thus partially or completely restore the power supply of consumers.
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Zachepa, Iu, N. Zachepa, O. Chornyi, A. Gladyr, О. Khrebtova, І. Serhiienko, and V. Prokopenko. "EXPERIMENTAL STUDIES OF OPERATING MODES LOCAL AUTONOMOUS POWER SUPPLY SOURCES WITH INDUCTION GENERATORS." Electromechanical and energy saving systems 4, no. 56 (December 2021): 56–66. http://dx.doi.org/10.30929/2072-2052.2021.4.56.56-66.
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Purpose. Experimental studies of modes of operation of local autonomous energy sources based on electrical equipment and power plants of other functional purposes in order to ensure the generation of electricity to consumers in both stationary and field conditions. Methodology. large-scale experimental research using modern means and methods of measuring, processing and transmitting information. Result. Proposed concept of creating an autonomous molded power supply based on the system "internal combustion engine-induction generator" using equipment for other functional purposes. determined the limits of the steady operation of typical consumers of electric energy during the connection to local autonomous power supply sources, which makes it possible, at their formation, to choose the required electrotechnical and electromechanical components according to the load. It is proved that the improvement of energy efficiency of local autonomous power supply sources is possible due to the use of additional control systems for their parameters, namely, a two-channel control system for additional capacitive excitation of the generator and the speed of the internal combustion engine Originality. Determining the criteria for local autonomous power supply sources operation in the field to provide energy to consumers of different categories, which allowed to formulate recommendations on the ratio of generator power in the local autonomous power supply sources operation and electricity consumers with different nature of the load. Practical value. The workability of the proposed concept is proved by the concept of creating an autonomous molded power supply according to the scheme "internal combustion engine – asynchronous generator" of electrical equipment for other functional purposes. Figures 24, tables 3, references 11.
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Kuang, Hong Hai, Sheng Qing Li, Jun Jun Li, and Ji Liang Yi. "Design Solution of Micro-Grid Power Supply System in Campus." Advanced Materials Research 953-954 (June 2014): 8–11. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.8.
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The micro-grid power supply scheme in campus based on the grid-connected solar energy PV power generation system is designed in this paper. This system mainly consists of solar power, diesel generation, it will can be incorporated into the local grid after it has been built. This results show that using this scheme can improve the reliability of power supply system in campus and reduce the cost.
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Byk, F. L., and L. S. Myshkina. "Effects of local intelligent energy systems integration." Power engineering: research, equipment, technology 24, no. 1 (May 23, 2022): 3–15. http://dx.doi.org/10.30724/19989903-2022-24-1-3-15.
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The energy sector of Russia is transforming, followed by total electrification and gasification, which has radically changed the fuel landscape and allowed enterprises in various sectors of the economy to create their energy sources based on gas turbine and gas piston cogeneration plants. There are more and more balanced local intelligent energy systems for various purposes, more often operating autonomously, since the process of their integration with the unified energy system of Russia is impossible without power and energy output, which is contrary to the interests of generating companies, territorial grid organizations and the system operator. Overcoming the administrative and technological barriers and obstacles created by significant players in the electric power industry reduces the technical and economic efficiency of local intelligent energy systems that can bring considerable beneficial systemic effects.THE PURPOSE Substantiation of the obtained system effects from integrating local intelligent energy systems.METHODS. A systematic approach to identify the effects of the integration of local intelligent energy systems with the unified energy system of Russia.RESULTS. Local intelligent energy systems are considered objects of distributed electric power industry that perform certain system functions, which is accompanied by a change in the properties of reliability, efficiency and environmental friendliness of the production and transmission of heat and electricity, which leads to various effects. The presence and size of the effects are determined by the type and type of the local intelligent energy system. It is shown that the integration of communal local intelligent energy systems, created for the energy supply of the population and equivalent consumers, has a certain advantage.CONCLUSION. The integration of communal local intelligent energy systems makes it possible to increase the availability and uninterrupted power supply, reduce the negative impact of off-market surcharges and cross-subsidization, improve the uniformity of load schedules for generating and grid equipment, which increases the efficiency of the unified energy system of Russia.
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Nakandala, Dilupa, Meg Smith, and Henry Lau. "Shared power and fairness in trust-based supply chain relationships in an urban local food system." British Food Journal 122, no. 3 (January 6, 2020): 870–83. http://dx.doi.org/10.1108/bfj-05-2019-0309.
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PurposeThe purpose of this paper is to investigate supply chain relationships in an urban local fresh food system from a retailer perspective to examine the types of relationships and the factors underpinning the development of such relationships.Design/methodology/approachUsing the multiple case study method, interview data from twelve urban local fresh food retailers in Sydney were analysed using the thematic analysis.FindingsThis study finds that balanced power relationships in the supply chain allow reasonable power to sit with growers in product price determination irrespective of the dependency of small-scale growers on relatively large local retailers. Trust-based relationships are developed over multiple transactions, where shared values across the supply chain and consistently low opportunistic behaviour in reward sharing are demonstrated to be the crucial factors underpinning close relationships. This study also found evidence of horizontal supply chain linkages among retailers in a competitive environment.Practical implicationsFindings of this study have implications for policymakers in designing urban fresh food systems and for practitioners in large urban retailers including supermarkets that attempt to integrate local food into their product portfolio.Originality/valueThis study extends the local food system literature dominated by rural studies to include new knowledge about the dynamics of collaborations in contemporary urban local fresh food supply chains. It provides the first empirical evidence of lateral inventory transshipment between retailers in a competitive environment confirming previous simulation studies.
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Shavelkin, A., and I. Shvedchykova. "MULTIFUNCTIONAL CONVERTER FOR SINGLE-PHASE COMBINED POWER SUPPLY SYSTEMS FOR LOCAL OBJECTS WITH A PHOTOVOLTAIC SOLAR BATTERY." Tekhnichna Elektrodynamika 2018, no. 5 (August 9, 2018): 92–95. http://dx.doi.org/10.15407/techned2018.05.092.
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Denny, David. "Development of China's Electrical Power System." Energy Exploration & Exploitation 7, no. 5 (October 1989): 328–36. http://dx.doi.org/10.1177/014459878900700505.
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The downtrend in electrical output, 10-14% 1977-79 to 6% 1979-84, was reversed to 7.4% between 1980 and 1987 when 35,000 Mw of capacity was added, transmission networks were expanded and regional grids linked. Part of this success arose from policies that replaced a monolithic system of bureaucratic planning to involvement of local interests and decentralization. Chinese organizations have also been able to take advantage of foreign technology and investment. Nevertheless, industrial output only reached 75-80% of its potential due to inadequate electric power supply.
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Кравченко, О. П., Е. Г. Манойлов, Г. О. Бабич, and Я. С. Малий. "ЗАСОБИ ЗАБЕЗПЕЧЕННЯ ОПТИМАЛЬНОГО ФУНКЦІОНУВАННЯ ЕЛЕКТРИЧНОЇ СИСТЕМИ ЛОКАЛЬНОГО ОБ’ЄКТУ." Bulletin of the Kyiv National University of Technologies and Design. Technical Science Series 148, no. 4 (March 10, 2021): 59–66. http://dx.doi.org/10.30857/1813-6796.2020.4.5.
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Development of electronic monitoring and control system for achieving an effective ratio between electrical energy generation and consumption in the local object power supply system. Methodology. The theory of electrical circuits and electronic circuits were used. Obtaned results. The electronic system for monitoring and controlling power supply in the local object power system was developed. The system comprises three modules: central processor, module for monitoring environment parameters and executive module which consists of measuring (current, voltage) and relay blocks. The central processor processes signals from monitoring and measuring blocks and forms executive commands on relay block in order to switch on/off consumer loads and electric generators. Developed systems alowes both maximal power take-off from distributed (renewable) energy sources and flexible implementation of power consumption regulation for achieving an effective ratio between the generation of electrical energy provided by renewable energy sources and the general distribution network, and the total load device consumption in the local object power system. Orginality. The electronic monitoring and controlling system in the local object power system alows providing generated and consumed loads monitoring in the real time. The system provides an ability to form real time energy profiles based on which the control algorithm for executive block control is formed in order to achieve an effective ratio between generation and consumption of electricity in the power system of the local facility.for in power consumption control system has been developed, which consists of a central processor, monitoring and executive units. The monitoring unit allows you to create energy profiles in real time, on the basis of which the control algorithm in the executive unit is formed in order to achieve an effective ratio between the electricity generation and consumption in the local object power system. Practical value. As a result of the presented work, an electronic system for monitoring and controling electricity supply in the local object power system with the defined formation of distributed energy sources generation and required consumption profiles in the real time was developed to provide efficient energy consumption according to the concepts of distributed electrical networks with renewable energy sources and Smart House.
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Samojlyk, Oleksandr, Galyna Kurbaka, and Maksym Dudnyk. "Analysis of local power supply system power balance based on renewable energy sources and storage batteries." Energy saving. Power engineering. Energy audit., no. 2(150) (December 31, 2019): 51–58. http://dx.doi.org/10.20998/2313-8890.2019.02.07.
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Narasimha, S., and Surender Reddy Salkuti. "Design and implementation of smart uninterruptable power supply using battery storage and photovoltaic arrays." International Journal of Engineering & Technology 7, no. 3 (June 14, 2018): 960. http://dx.doi.org/10.14419/ijet.v7i3.12305.
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The objective of this paper is to provide an uninterruptable power supply to the customers by selecting the supply from various reliable power sources such as solar photovoltaic, AC mains and battery storage systems. Initially, the load gets power supply from the reliable source (such as solar photovoltaic), if in case it is unavailable, then the proposed modules automatically switch over to the next reliable source (such as AC mains), and so on. If in case all proposed renewable energy sources (RESs) are unavailable than the proposed mod-ule automatically switch over to the local grid supply, if suppose the local grid supply is also unavailable then the proposed module au-tomatically switch over to the power storage bank. Therefore, the proposed intelligent/smart power module can improve the system per-formance and efficiency. The programming instruction of controller, the relay driver switches appropriate relay of sources to maintain uninterruptable power supply to the proposed utility of capacity 0.1kW. The proposed back-up system gets charged from the available reliable RESs with no pollution and noise, and it can also reduce the electricity bill. The proposed intelligent power module functions are displayed on LCD, it has been designed and analyzed in real time environment.
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Mao, Long Bo, Wei Jun Wang, Bin Yi, Qiang Dai, Hong Ju Mi, and Tao Yuan. "Design and Research on Wind-Solar-Diesel Hybrid Generating System at High Altitude." Advanced Materials Research 605-607 (December 2012): 424–27. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.424.
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At the high altitude, the construction of wind-solar-diesel hybrid power station is a effective measure to solve the problem of power supply in remote areas. Combining with the local natural resources, in order to ensure the reliability of the power supply and heighten the price-performance ratio of the system, designing the wind-solar-diesel hybrid power station in reason is of great significance for increasing the prevalence rate of the wind-solar-diesel hybrid power station.
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Sosnina, E. N., and A. V. Shalukho. "The effective utilization of renewable energy sources in a local power supply system." Power Technology and Engineering 46, no. 6 (March 2013): 467–70. http://dx.doi.org/10.1007/s10749-013-0380-y.
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Bulatov, Yu N. "Joint voltage and frequency predictive controllers for distributed generation plants." iPolytech Journal 25, no. 5 (November 9, 2021): 568–85. http://dx.doi.org/10.21285/1814-3520-2021-5-568-585.
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The paper determines the effect of proposed joint voltage and frequency predictive controllers for distributed generation (DG) plants on quality indicators characterizing the control process in different operating modes of power supply systems. The studies are conducted in the MatLab environment (Simulink and SimPowerSystems simulation packages) employing control engineering methods. It is proposed to design and adjust joint predictive controllers by determining the resonant frequency of oscillations for the master generator rotor. This approach provides better quality indicators of voltage and frequency control in power supply systems while maintaining the same settings for the controllers of DG plants. With an additional load in an isolated power supply system, the maximum voltage sag is found to be 1.75 times lower than for local predictive control and 3.5 times lower as compared to the use of conventional controllers. For the specified mode, predictive controllers enable a threefold reduction in the transient time between rotor rotational speeds in a synchronous generator. In the start mode of a powerful electric motor, the predictive controllers of synchronous generators in the power supply system enable a 1.5 times reduction in voltage sag, with a 1.4 times reduction in overvoltage following its start. In the case of a short-term three phase short-circuit, joint predictive controllers allow a 1.5 times decrease in transient time and a 2.3 times decrease in the overshoot of power line frequency as compared to local control. In addition, frequency oscillation in the power system is also reduced. Similar effects are observed in other operating modes of the considered power supply systems equipped with DG plants. The performed dynamic simulation confirms the effectiveness of using joint voltage and frequency predictive controllers for DG plants, which consists in a positive impact on the quality of processes involved in controlling the parameters of power supply systems in various operating modes.
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Eparu, Cristian, Silvian Suditu, and Alina Prundurel. "Ensuring security of local gas supply using pipeline gas storage." Analele Universitatii "Ovidius" Constanta - Seria Chimie 24, no. 2 (December 1, 2013): 98–108. http://dx.doi.org/10.2478/auoc-2013-0017.
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Abstract This paper presents a natural gas supply system of a locality. Since power consumption is nonstationary, for supplying the consumption peaks it is used a gas deposit kept in a pipeline built near the locality. The viability of this solution was demonstrated by simulation with the numerical simulator SIMONE.
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Zhao, Heng, Zheng Dao Yuan, and Can Yan Zhu. "The Distributed Water Supply System Based on the Technology of Power Line Communication." Advanced Materials Research 926-930 (May 2014): 1584–88. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.1584.
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In view of the recent problem of serious water waste at school, this paper proposed a kind of distributed water supply system. This system can control the water resource inside school by network build in the local power line. This paper mainly introduced the system structure, hardware constitution, the software process of upper computer between lower computer of such distributed water supply system, and through the test prototype, it completed the experiment, comparison and analysis.The experiment result shows that such water supply system can improve significantly the water saving rate of school, even to 38 percentages, and has excellent application value.
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Zhazhkov, Vyacheslav V., Marina Yu Zubkova, Vladimir I. Maslikov, Dmitry V. Molodtsov, Alexander N. Chusov, and Diana V. Semenenko. "Model Calculation of Energy Carriers Expenses on the Basis of Biogas in System Reformer - Fuel Cell for Autonomous Power Supply Systems." Applied Mechanics and Materials 725-726 (January 2015): 1602–7. http://dx.doi.org/10.4028/www.scientific.net/amm.725-726.1602.
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This paper presents the results of experiments and calculations of the energy expenses in tandem system reformer - fuel cell on hydrogenous fuel derived from biogas. Possibility of electricity generation based on complex use of organic and hydrogenous fuel at creation of objects of distributive systems of power supply will approach energy sources to the consumer, having increased energy-economic indicators and efficiency of fuel use. A promising direction in the creation of autonomous power supply systems in low-rise residential development is the use of fuel cells running on hydrogenous fuel derived from biogas Expenses of hydrogen fuel to operate the power installation with a predetermined capacity comparable with the required amount of hydrogen obtained by electrolysis. The calculated value of the efficiency of the system reformer - fuel cell, based on data on the required quantity of biogas and methane, as well as numerical characteristics of workflows fuel system, equal to 38.4%, confirms the relatively high efficiency of the use of hydrogenous fuel for the tasks of autonomous power supply. Usage of relatively low-cost hydrogen-containing fuel obtained from biogas from local secondary renewable resources will contribute to the creation of autonomous economic systems of power supply.
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Kareem, Olalekan Kabiru, Aderibigbe Adekitan, and Ayokunle Awelewa. "Power distribution system fault monitoring device for supply networks in Nigeria." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 4 (August 1, 2019): 2803. http://dx.doi.org/10.11591/ijece.v9i4.pp2803-2812.
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Electric power is the bedrock of our modern way of life. In Nigeria, power supply availability, sufficiency and reliability are major operational challenges. At the generation and transmission level, effort is made to ensure status monitoring and fault detection on the power network, but at the distribution level, particularly within domestic consumer communities there are no fault monitoring and detection devices except for HRC fuses at the feeder pillar. Unfortunately, these fuses are sometimes replaced by a copper wire bridge at some locations rendering the system unprotected and creating a great potential for transformer destruction on overload. This study is focused on designing an on-site power system monitoring device to be deployed on selected household entry power cables for detecting and indicating when phase off, low voltage, high voltage, over current, and blown fuse occurs on the building’s incomer line. The fault indication will help in reducing troubleshooting time and also ensure quick service restoration. After design implementation, the test result confirms design accuracy, device functionality and suitability as a low-cost solution to power supply system fault monitoring within local communities.
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Cherniuk, A. M., Ye I. Kachanov, Yu O. Cherevyk, and Z. V. Oberemok. "General Framework for Ensuring Indicators of Reliable Power Supply in Local Decentralized Power Systems." Visnyk of Vinnytsia Politechnical Institute 159, no. 6 (2021): 88–92. http://dx.doi.org/10.31649/1997-9266-2021-159-6-88-92.
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Sednev, V. A. "Justification of methods for calculating electrical loads life support systems for the affected population and rescue units during field deployment." Technology of technosphere safety 94 (2021): 156–71. http://dx.doi.org/10.25257/tts.2021.4.94.156-171.
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Introduction. Over the past twenty years, the most severe natural and man-made disasters have occurred in various regions of the country and the world, as a result of which people were deprived of housing. The increase in the number, scale and duration of the consequences of emergencies related to the violation of the conditions of normal living of people requires the creation of temporary field accommodation points for the affected population, which create and serve rescue formations. At the same time, in the complex of tasks aimed at the life support of the population and rescue units in field temporary accommodation facilities, their electric power supply plays an important role. However, the established practice of calculating the electrical loads of stationary objects by methods based on data on separate electrical receivers makes it difficult to determine them for a field temporary location of people due to the lack of reliable information on its electrical receivers, which leads to significant errors in calculations, irrational composition of the electrical supply system and the use of its elements against the background of restrictions in the use of local energy resources and infrastructure facilities, which themselves may experience difficulties with reliable power supply due to the limited capacity of local power systems. The purpose of the study. Electric power supply and electric power safety of field temporary accommodation points of the affected population and rescue units, ensuring the required reliability of electric power supply, maximizing its efficiency in conditions of possible resource constraints and minimizing the influence of the uncertainty factor when planning power consumption. Research methods. The main provisions of the calculation of electrical loads, systems theory, set theory, probability theory and the apparatus of mathematical statistics. The results of the study. A methodology has been developed that allows to justify the power consumption of a temporary field accommodation facility for people, while the construction of its life support power supply system is carried out in accordance with the available consumers, taking into account their composition, area and other factors affecting the organization of the power supply system and the construction of consumers. Conclusion. The scientific and methodological approach to the choice of methods for calculating the electrical loads of the life support system of the affected population and rescue units during field deployment is substantiated, which also allows to resolve the contradiction between the need to organize the power supply of their life support and the lack of reasonable standards of power consumption of life support facilities and methods of their calculation. Key words: temporary field accommodation, life support, electric energy consumers, electric power supply, organization.
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Kolpakhchyan, Pavel G., Alexander R. Shaikhiev, Elena A. Yatsenko, Boris M. Goltsman, and Andrey S. Oshchepkov. "Gas micro-turbines with high-speed electric generators for local smart energy systems." Nexo Revista Científica 33, no. 01 (July 20, 2020): 77–83. http://dx.doi.org/10.5377/nexo.v33i01.10048.
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At present, the share of energy collected from renewable resources and low-power units is growing, and the generation becomes distributed, having many facilities that operate in co-generation mode. That is why the construction of an energy system with distributed heterogeneous sources and the improvement of its efficiency have become widely discussed issues. This paper proposes a solution of a local smart energy systemfortheTechnoEcoPark, a sciencepark of Rostov State Transport University, Rostov, Russia. The solution aims to integrate the distributed generation facilities, including environmentally friendly renewable resources, grid infrastructure and consumers with controllable and uncontrollable load. Theapproachtothe problem is the application of a smart control systemthatmanagesgeneration, distribution and consumptionof energy in a mini-CHP-based autonomous energy system. Such smart control systems reveal the trends of optimal energydistribution in a autonomousenergysystem. The study substantiates that installation of an in-house mini-CHP can solve the task of supplying heat and powertotheTechnoEcoPark. The important advantage of the solution is a significant reduction of expenses on energy consumption as the generation costs less compared to the grid tariffs. The proposed energy supply system of the TechnoEcoPark exemplifies the integration of heterogeneous heat and power sources and consumers into a commonnetwork. The paper outlines the mechanisms of the energy system efficiency improvement. These mechanisms make it possible to provide heat and power supply services to consumers and to return the generated power into the centralized grid. The materials of the paper can be of use to the specialists and researchers who are interested in generation and distribution of energy in autonomous systems.
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Vodyannikov, Vladimir T., Elena V. Кhudyakova, Marat M. Nizamutdinov, Asiyа K. Subaeva, and Ilnur N. Safiullin. "Technical and Economic Assessment of Local Power Supply Systems for Agro-Industrial Production in the Digital Economy." BIO Web of Conferences 37 (2021): 00132. http://dx.doi.org/10.1051/bioconf/20213700132.
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Energy and energy supply development determines the rate of production intensification, including agricultural production. The current state of rural power supply is characterized by a high degree of deterioration of electrical equipment, long distance overhead power lines, low reliability of low-voltage electrical networks, and a higher accident rate. With an aim of ensuring food security and export orientation of the industry for the next 5 years, it is necessary to implement a set of measures to improve the efficiency of energy supply to agricultural production. This task will be hampered by a constant rise in prices and tariffs for energy resources. Thus, over the last 20 years, energy costs have increased from 3-5 % to 30-40 % in agricultural production. The specific capital investment (per 1 kW of power) and the cost of 1 kWh of electricity were reported to depend on a type of local energy source and its capacity. The paper proposes a method for marking out the economic boundaries of the effective use of local power supply arrangements to replace a standard central station. A power gen-set supplying energy to an agricultural holding is capable of operating in two modes subsequent upon utility (central station) electricity – autonomous and parallel. The authors compared the cost of electrical and thermal energy produced by the power gen-set and tariffs for these types of energy. Calculations have shown that it is advisable for an agricultural holding to have a local power supply system being a power gen-set based on gas engine-generators.
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Pan, Ming Ming, and Shi Ming Tian. "Research on User-Side Distributed Power System Control Strategy." Advanced Materials Research 875-877 (February 2014): 1881–87. http://dx.doi.org/10.4028/www.scientific.net/amr.875-877.1881.
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Distributed power system, especially the distributed power and micro-grid system in the mountain villages, islands and remote areas, has many advantages, which can be used as an effective supplement of grid to help solve the problem of electricity supply. The connected-grid inverter needs to be able to work in both grid mode and island operation mode in order to ensure the safety of the local critical load. The paper proposed the seamless switching control strategy for two modes of switching. The experimental results verify the property of the topology structure and control strategy.
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Le, Phuc Duy, Duong Bui Minh, Hoai Banh Duc, Hoan Nguyen Thanh, Minh Doan Ngoc, Tung Nguyen Minh, and Khoi Nguyen Minh. "Simulation on power-flow dispatching cases for Microgrid with PVS and battery energy storage system." Science & Technology Development Journal - Engineering and Technology 2, no. 3 (January 22, 2020): 163–78. http://dx.doi.org/10.32508/stdjet.v2i3.567.
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Modern Microgrid (MG) mainly consists of distributed generators (DGs), energy storage systems (ESSs), different loads, and protection systems. Microgrid plays an important role not only to ensure the power supply reliability but also to improve the power quality in distribution network. Moreover, deployment of distributed generators such as Photovoltaic Generation System (PVS), wind turbine generation system, and energy storage systems diversifies operation and control modes of AC microgrid in order to meet local demand response. This paper studies on power-flow dispatching cases for a MG with PVS and Battery Energy Storage System (BESS), which considers the maximum power consumption generated by the PVS and minimizes the power received from the utility grid. Simulation results validate the effectiveness of BESS for actively dispatching power-flow of MG in case the PVSs cannot partially or fully meet the local demand response in peak hours. By using ETAP software, real data of the PVSs are used to do simulation and power-flow calculation for the MG, which is to evaluate the feasibility of power-flow dispatch solutions proposed in this paper.
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Lai, Jing Ming, Shi Hong Wang, Feng Xue, Ke Liu, and Jing Chen. "An Intelligent Instruments Management System for Test Instruments." Applied Mechanics and Materials 333-335 (July 2013): 2437–41. http://dx.doi.org/10.4028/www.scientific.net/amm.333-335.2437.
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Based on ARM embedded platform and WINCE system we developed an intelligent system oriented to test processes in the power supply industry. The intelligent instruments management system(IIMS) used RFID(Radio Frequency IDentification) technology and achieved the functions such as automatic instruments identification, automatic confirmation of the operators, the operations of warehouse site controller, electronic use records, etc. IIMS could be controlled remotely via LAN(Local area network). IIMS was applied to the test team in Dongguan Power Supply Bureau. The implemental results show that it greatly enhances instruments usage efficiency. The average time of check-in and check-out of each instrument in the regular operations drops from 69 seconds to 11 seconds. The implementation also shows that IIMS is responsive with stable performance.
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Olajuyin, E. A., and Olubakinde Eniola. "MICROGRID IN POWER DISTRIBUTION SYSTEM." International Journal of Research -GRANTHAALAYAH 7, no. 8 (July 23, 2020): 387–93. http://dx.doi.org/10.29121/granthaalayah.v7.i8.2019.687.
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Power is a very important instrument to the development of economy of a nation and it must be stable and available and to meet the demand of the consumers at all times. The quest for power supply has introduced a new technology called microgrid. Micro grids are regarded as small power systems that confine electric energy generating facilities, from both renewable energy sources and conventional synchronous.
Generators, and customer loads with respect to produced electric energy. It can be connected to grid or operate in islanding mode. On the other hand, the grid’s dynamics and its stability rely on the amount of stored energy in the micro grid. In a conventional power system with a large number of synchronous generators as the main sources of energy, the mechanical energy in the generators’ rotors, in the form of kinetic energy, serves as the stored energy and feeds the grids in the event of any drastic load changes or if disturbances occur. Microgrid is an alternative idea to support the grid, it can be applied in a street, estates, community or a locality (towns and villages), organizations and establishments. Load forecasting can be further extended to Organizations, Local Government, State and country to determine the energy consumption.
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Riaño, Cristhian, Elkin Florez, and Cesar Peña. "Sizing of Hybrid Photovoltaic-Wind Energy Systems Based on Local Data Acquisition." Ingeniería y Ciencia 17, no. 33 (May 12, 2021): 121–50. http://dx.doi.org/10.17230/ingciencia.17.33.6.
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Although there are different alternatives to provide energy, there are still remote regions with no nearby possibilities of having an electricity supply that meets their basic needs. Colombia, like many countries, does not have uniform environmental conditions; therefore, applying models for the dimensioning of energy systems based on renewable energy can be inefficient and expensive, making it difficult to access electricity in isolated places. The research aims to develop a sizing strategy for a hybrid system based on locally acquired environmental information to size a system that takes advantage of the natural resources available in the local in the best possible way. Information is collected through a data acquisition system on local environmental conditions, system requirements are established based on energy demand, and a mathematical model is sought that represents the electrical behavior. The model makes it possible to analyze the system’s behavior under variable environmental conditions in the region, thus guaranteeing an adequate dimensioning for a constant supply of low-power energy suitable for residential use. This article presents an alternative to characterize a hybrid power generation system (photovoltaic/wind turbine) through data collected on-site, which, when properly processed, allows the dimensioning of a more appropriate hybrid system to the environmental conditions the environment. The system was implemented in an experimental farm of the University of Pamplona located in the north of Colombia. Based on this strategy, a hybrid system was designed and installed to meet energy demands efficiently.
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Shchur, Ihor, Marek Lis, and Yurii Biletskyi. "Passivity-Based Control of Water Pumping System Using BLDC Motor Drive Fed by Solar PV Array with Battery Storage System." Energies 14, no. 23 (December 6, 2021): 8184. http://dx.doi.org/10.3390/en14238184.
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In remote locations, it is advisable to combine solar water pumping with electric energy storage and power supply for other forms of consumption. In such complex systems, individual subsystems feature their own local control, and the general automatic control of the system in different modes of its operation is carried out in accordance with an energy management strategy (EMS). In this paper, the functions of local and general control of the solar water pumping system with battery storage and external power supply are combined in the system of passivity-based control (PBC). The EMS is constructed in such a way that for all modes, only two PBC systems are developed, which are switched depending on the battery’s state of charge and the current levels of the two main disturbances—solar irradiation and electrical consumption. For each system, two control influence former (CIF) structures were synthesized and their operation was investigated by computer simulation. Despite the simplicity of CIFs’ implementation, due to the introduced interconnection and damping coefficients, such control allows the provision of the required voltage regulation with a static error up to 1%, sufficient quality of transients during disturbances and switching of the system structure, as well as system asymptotic stability.
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Kalyuzhniy, D. "IDENTIFICATION AND EVALUATION OF HARMONIC VOLTAGE SOURCES IN POWER SUPPLY SYSTEMS." Municipal economy of cities 1, no. 161 (March 26, 2021): 157–62. http://dx.doi.org/10.33042/2522-1809-2021-1-161-157-162.
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Non-sinusoidal voltage in power supply systems leads to economic losses that need to be distributed and compensated. This problem is solved on the basis of the problem of identification and evaluation of the influence of voltage distortion sources. To date, existing methods for identifying and assessing the impact of harmonic voltage sources have significant limitations of practical implementation. This is due to their basic mathematical model and local approach to measuring the parameters of the network. In the given research the new mathematical model of identification and an estimation of harmonic voltage sources that is focused on the distributed measuring system is presented. The criterion for identifying harmonic voltage sources is the distorting nodal current. To adequately determine it, it is necessary not only to measure the parameters of the network mode in the base nodes by the currents of the higher harmonic components, but also to control the structure and parameters of the replacement circuit of the entire power supply system. To achieve this goal, it is proposed to use a distributed measuring system, which is based on vector measurement systems and control systems. The estimation of the influence of harmonic voltage sources is directly proportional to the distorting nodal current, where the coefficient of proportionality is either mutual or intrinsic resistance of power supply systems, that connects the location of the distortion source and the place for which its influence is estimated. In order to control the influence of measurement errors and determine the parameters of circuits for replacing elements of the power supply system, the method and algorithm for identifying and assessing the impact of harmonic voltage sources should be developed based on the principle of excluding one of the voltage distortion sources.
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Carr, David, and Kenneth Starcher. "Small Wind Power Considerations." Journal of Green Building 4, no. 2 (May 1, 2009): 1–22. http://dx.doi.org/10.3992/jgb.4.2.1.
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Wind energy can be a supplemental source of energy to an electric grid or the complete power supply for an isolated source. It produces no waste particulate matter, uses no water for cooling, and contributes no green house gasses to the environment. A short description of the Alternative Energy Institute, at West Texas A&M University, and the basics of wind energy as well as some discussion of home scale wind systems are presented here. The uses of wind energy and many of the basic concerns and considerations of placing wind energy conversion systems on or near primary structures are discussed. The basic plan for a renewable energy system inclusion into a home or building is shown; it is always preferable to reduce the energy load and ensure that the structure will use energy as efficiently as possible before a system is designed. Current federal support for renewables is at a new high, and the source for local and regional description of programs is shown.
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Kuznietsov, Mykola, Olha Lysenko, and Oleksandr Melnyk. "OPTIMAL REGULATION OF LOCAL ENERGY SYSTEM WITH RENEWABLE ENERGY SOURCES." Bulletin of the National Technical University "KhPI". Series: Energy: Reliability and Energy Efficiency, no. 1 (2) (July 2, 2021): 52–61. http://dx.doi.org/10.20998/2224-0349.2021.01.08.
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The paper is devoted to solving the balancing problem in local power systems with renewable energy sources. For a power system optimization problem, whose operation depends on random weather factors, a convex parameter optimization or optimal control problem was solved using controlled generation, for each individual realization of a random process as a deterministic function, and then statistical processing of results over a set of random realizations was performed and distribution density functions of the desired target function were constructed, followed by estimation of expected values and their confidence intervals. The process describing current deviations of generated power from mean value is modelled as discrete stray model and has properties of Ornstein-Uhlenbeck process, which allowed varying the duration of unit interval, in particular to select data bases of operating objects with inherent temporal discreteness of their monitoring systems. Random components are investigated and modelled, while the average values are considered to be deterministic and are provided within a predictable schedule using also traditional energy sources (centralised power grid). A mathematical model of the combined operation of renewable energy sources in a system with variable load, electric storage device and auxiliary regulating generator is implemented as a scheme of sequential generation and consumption models and random processes describing the current state of the power system. The operation of the electricity accumulators is dependent on the processes mentioned, but in the full balance, it appears together with generation or load losses, which are cumulative sums of unbalanced power and may have a different distribution from the normal one. However, these processes are internal, relating to the redistribution of energy within a generation system whose capacity is generally described satisfactorily, given the relevant criteria, by a normal law. Under this condition, it is possible to estimate the probability of different circumstances - over- or under-generation, that is, to give a numerical estimate of the reliability of energy supply.
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Qiu, Shi Hui, and Qi Wang. "The Application of Wind and Solar Power Generation System in the Ocean Marginal Oil Field Development." Advanced Materials Research 282-283 (July 2011): 731–34. http://dx.doi.org/10.4028/www.scientific.net/amr.282-283.731.
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Facing the growing energy needs, ocean marginal fields more and more attention. But the supply is one of the constraints of ocean marginal oil field development. Therefore research and development in power supply system of local installation, low cost, easy maintenance and management, resource conservation, environmental-friendly is critical. This paper investigates the application of wind and solar energy development, as against the existing marginal oil field development project, through designing wind and solar power generation system to discuss the development of marginal oil fields in the feasibility of the application to make constructive comments.
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Dai, Shi Yong, Fan Pan, and Fei Liu. "Application of Wide-Area Automatic Switchover System Based on EMS." Applied Mechanics and Materials 325-326 (June 2013): 573–76. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.573.
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The traditional automatic switchover device installed in substation only uses local real-time information to make control strategies, with the logic of device predetermined, so it could not adapt to different operating modes. A new wide-area automatic switchover system based on energy manage system (EMS) is proposed in the paper. The wide-area automatic switchover modeling is established through automated modeling and the real-time rest oration control is implemented. The system solves the power supply restore under serial single power supply failure. By comprehensive use of information of the whole network, the automatic switchover can coordinate with other automatic security devices and protections. In addition, the control strategies and network security will be checked and modified in order to prevent from overload and improve security of automatic switchover strategies. The system has been used in Guangdong power grid of China.
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Joshi, Govind, and Salman Mohagheghi. "Optimal Operation of Combined Energy and Water Systems for Community Resilience against Natural Disasters." Energies 14, no. 19 (September 26, 2021): 6132. http://dx.doi.org/10.3390/en14196132.
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One of the most critical challenges for modern power systems is to reliably supply electricity to its consumers during and in the aftermath of natural disasters. As our dependence on electrical power has increased over the years, long-term power outages can lead to devastating impacts on affected communities. Furthermore, power outages can halt the operation of water treatment plants, leading to shortages in clean water, which is essential during post-disaster recovery. One way to address this is to temporarily reconfigure power and water networks into localized networks, i.e., electric microgrids and water micro-nets, that utilize local resources to supply local demand independently of the main power grid and/or water network. Utilizing distributed energy resources such as wind and solar and treating wastewater locally for potable reuse can provide the operational flexibility for such systems to operate sustainably. However, due to uncertainties in both renewable energy generation and electric/water consumption, ensuring sustainable operation is a challenging task. In this paper, an optimal operational strategy is proposed for an islanded microgrid/micro-net, considering the stochastic nature of renewable energy resources, electric demand, and water demand. An energy storage system is modeled to address the uncertainty in power generation and demand, in conjunction with local water storage and wastewater treatment to accommodate variable water demands. A two-stage stochastic programming model is formulated and solved to determine an optimal operation strategy for the combined system.
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Zhang, Yangyang, Bin Li, Youxiong Deng, Chunjie Lian, and Jingde Wang. "Optimal Configuration of Photovoltaic-wind-storage Microgrid for Agricultural Irrigation in Mountainous Areas." E3S Web of Conferences 256 (2021): 02024. http://dx.doi.org/10.1051/e3sconf/202125602024.
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Water and electricity supply for irrigation is difficult in remote mountainous areas. This paper explores agricultural irrigation systems’ integration mechanism, pumped storage power plants, and renewable power sources in mountainous areas to solve this problem. It establishes a microgrid power supply system with multiple complementary energy sources according to local conditions. By analyzing the load of agricultural irrigation in mountainous areas, the irrigation water consumption and electricity consumption are obtained. The capacity of pumped storage power stations, wind power, and photovoltaic power generation in the microgrid can be configured accordingly. They use the renewable power supply active power fluctuation rate index as a constraint and use the spectrum analysis method to calibrate the capacity configuration results. Finally, the scenic storage microgrid model is constructed and solved to minimize the microgrid’s grid connection cost. The algorithm shows that the proposed capacity allocation method can meet the irrigation load demand and realize the microgrid’s coordinated operation.
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He, Hailei, Runzhao Lu, Xin Gao, Jian Zhang, Qingzhi Jian, and Wensheng Li. "A method of power-electronized supply accommodation capacity analysis for receiving-end grid based on multi-objective optimization." Journal of Physics: Conference Series 2260, no. 1 (April 1, 2022): 012039. http://dx.doi.org/10.1088/1742-6596/2260/1/012039.
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Abstract With the development of renewable energy and high voltage direct current (HVDC) system, the proportion of power-electronized supply in power system is increasing. It creates challenges to the safe and stable operation of the receiving power grid. Reasonable evaluation of the scale of power-electronized supply that can be carried by the receiving-end grid is of great significance to guide power grid construction and maintain its operational safety. Firstly, this paper explains the theory that the unified effective short circuit ratio (UESCR) can reflect the static voltage stability of buses. Then, a multi-objective optimization model, which considers the external dc feed-in, local renewable energy, unit output, and operation constraints, is established to obtain the power-electronized supply accommodation capacity. And it is solved repeatedly by means of cyclic increasing dc feed-in scale and renewable energy penetration. Finally, the effectiveness and practicability of the proposed method are verified in a modified IEEE 39 bus system.
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Otcenasova, Bolf, Altus, and Regula. "The Influence of Power Quality Indices on Active Power Losses in a Local Distribution Grid." Energies 12, no. 7 (April 10, 2019): 1389. http://dx.doi.org/10.3390/en12071389.
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This paper deals with the topic of power quality in a local distribution grid. It is aimed to analyze the individual influences, which aggravate the power quality of the distribution grid. Based on the analysis, the most adverse effects were determined, and they were the voltage drops and supply voltage interruptions, supply voltage unbalance, load power factor, and also higher harmonics. These influences cause the technical losses in a distribution grid, which subsequently have a financial impact not only on the distribution, but also on the transmission of electricity. Only the load voltage unbalance, the load power factor, and the higher harmonics, which mainly cause the technical losses, were analyzed in this paper. The measurement of the influences of the adverse effects was performed on the model of a 22-kV distribution grid. The measurement was performed on the basis of three types of power line conductors and their different lengths, three types of active power consumption, and the different values of these adverse effects. According to this measurement, a simulation in program Matlab-Simulink was created. This simulation represented part of a 22-kV distribution grid, which was influenced by the abovementioned adverse effects. The results of the measurements were compared with the results of the simulation. Based on the evaluation of the technical losses from the measurement and the simulation, the financial losses during a certain period were calculated for the distribution system operators.
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Da, Ting. "Photoelectric Sensor Circuit and Image Segmentation Method for Radar System." Journal of Nanoelectronics and Optoelectronics 16, no. 2 (February 1, 2021): 170–78. http://dx.doi.org/10.1166/jno.2021.2920.
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In this exploration, based on the principle and system parameters of laser three-dimensional (3D) radar imaging technology, the corresponding photoelectric sensor circuit scheme is formulated. The sense circuit of avalanche photon diode (APD) converts the signal through the transresistance amplifier circuit. Then, LMH6629 is selected as a precision amplifier with low input noise voltage and low input error current. The capacitance is used as a compensation element to compensate the phase. For the power supply scheme, choosing the mode of switching power supply and LDO to work together can improve the efficiency of power supply and reduce the output of current ripple. At the same time, semantic segmentation is carried out for the obtained photoelectric images. Based on the traditional spatial pyramid pooling algorithm, the fusion of mean intersection over union and cross information entropy loss function is introduced to improve the weight of local image region. In the experiment, Multisim software is used to simulate the circuit. The APD reverse bias voltage is set to 90 V, and the multiplication coefficient is 98.7. The feedback resistance, bandwidth, phase compensation capacitance and other parameters are further calculated. It is found that there is obvious self-excited phenomenon in the output waveform of the transresistance amplifier without phase compensation capacitor. When the feedback capacitance reaches 0.8 pF, the oscillation phenomenon is obviously reduced; further calculation shows that the bandwidth of transresistance amplifier is 230 MHz, and the noise of APD power supply is mainly caused by BUCK switching power supply switch when the bottom noise of oscilloscope is ignored. However, the noise is suppressed under the action of the back-end LDO device; after the loss function is introduced, the contour of the photoelectric image is preserved completely, and then the more accurate segmentation results are obtained.
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Dwi Riana, Aryani, Faiz Hunsnayain, Edward Andres Pramana, Hwachang Song, Pambudi Yoyok Dwi Setyo, Anne Zulfia, and Chairul Hudaya. "Implementation of talis and dc house system for rural areas in indonesia." MATEC Web of Conferences 218 (2018): 01006. http://dx.doi.org/10.1051/matecconf/201821801006.
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In 2017, the aggregate electrification ratio in Indonesia has been achieving 92.8%. However, some rural areas such as in Maluku and Papua Islands still have low electrification ratio (~70%). One of the main problems in supplying electricity to rural areas in Indonesia is the geographical concern which consisted of islands leading to the difficulty of electricity grid development. In some areas, diesel power plant has been being built to supply the electricity. However, it causes another problem to transport the primary energy source to the targeted area which would increase the cost of electricity supply. Besides, it also needs investment cost to build transmission and distribution systems, as well as the maintenance expenses. To resolve this issue, a new scheme of battery-based Tabung Listrik or TaLis (DC-based power bank) and DC house system is proposed to be the solution to provide electricity to rural areas. The potential of local renewable energy sources such as biomass, hydro, wind, and solar could be utilized to be charging sources of batteries (TaLis). This study presents the TaLis prototype, DC house installation, supply chain process and charging scheme of TaLis, and cost comparison between the proposed system with other existing power systems such as communal PV farm and diesel power plant. We found that TaLis and DC house system provided the least cost of electricity production compared to other power systems, i.e. $0.88/kWh for TaLis and DC house system, $1.65/kWh for diesel power plant, and $1.47/kWh for communal PV farm. Implementation of this approach is expected to improve the welfare and quality of life of rural communities immediately.
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Denisov, Yuri. "AUTONOMY VOLTAGE INVERTER AS A PART OF AUTO-REGULATION OF LOCAL HIGH-VOLTAGE POWER SUPPLY SYSTEM." TECHNICAL SCIENCES AND TECHNOLOG IES, no. 3(9) (2017): 144–54. http://dx.doi.org/10.25140/2411-5363-2017-3(9)-144-154.
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SUGAWARA, Makoto, Yoshikazu ARAI, Shintaro IMAI, and Toshimitsu INOMATA. "2P1-V03 Wireless Power Supply to Rotary Receiver and Transmitter of Spatially Seamless Local Communication System." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2015 (2015): _2P1—V03_1—_2P1—V03_4. http://dx.doi.org/10.1299/jsmermd.2015._2p1-v03_1.
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Li, Xin, Xiaodi Zhang, and Yuling Fan. "A Two-Step Framework for Energy Local Area Network Scheduling Problem with Electric Vehicles Based on Global–Local Optimization Method." Energies 12, no. 1 (January 8, 2019): 195. http://dx.doi.org/10.3390/en12010195.
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To reduce the fluctuation of renewable energy (RE) supply and improve the economic efficiency of the power grid, the energy local area network (ELAN), which is a subnetwork of the energy internet (EI), plays an important role in specific regions. Electric vehicles (EVs), as virtual energy storage (VES) in ELANs, are helpful to decrease the fluctuations of RE supply. However, how to use EVs in ELANs is a complex issue, considering the uncertainties of EVs’ charging demand, the forecast data errors of RE sources, etc. In this paper, a typical ELAN structure is established, taking into account RE sources, load response system, and a distributed energy storage (DES) system including EVs. A two-step optimization framework for ELAN scheduling problem is proposed. A global optimization model based on forecast data is built to maximize the income of ELAN, and an online local optimization model is introduced to minimize the correction cost utilizing prior knowledge. Finally, the proposed two-step optimization framework is applied to a series of real-world ELAN scheduling problems. The results show that DES system with EVs can reduce the volatility of RE supply evidently, and the proposed method is able to maximize the income of the ELAN efficiently.
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Yu Brostilova, T., V. A. Ageev, S. V. Golobokov, and M. V. Sotnikov. "The efficiency of electric power supply with the transmission of peak loads to distributed generation." IOP Conference Series: Earth and Environmental Science 866, no. 1 (October 1, 2021): 012032. http://dx.doi.org/10.1088/1755-1315/866/1/012032.
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Abstract A model of a radial power supply system in MatLAB was compiled to perform the research. The transformer substation is represented by a step-down transformer, the load of the substations in the form of a resistance. Electricity is transmitted to the substations along three power transmission lines. The power center is represented by an ideal source. A reserve source of limited power is connected to the remote substation. We made calculations of the voltage drop in the lines, voltage at the inputs of substations and electricity losses for transit. The study of the radial power supply system was performed in the daytime maximum mode; the minimum load mode was performed at night and in the peak load mode. As a result of modeling the operating modes, the indicators of the classical radial power supply scheme were compared with the indicators of the system when the local generation facilities were switched on during the working shift or during peak hours. Connection of reserve sources allows reducing voltage fluctuations along the line and reducing power losses for transit.
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Kharlamova, Natalya Anatolyevna. "Promising solutions for the reconstruction of small power supply systems." Agrarian Scientific Journal, no. 4 (April 22, 2021): 106–8. http://dx.doi.org/10.28983/asj.y2021i4pp106-108.
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Solutions for the reconstruction of low-capacity power supply systems are considered and analyzed. The most promising ones are highlighted. Possibilities of their application at industrial, agro-industrial and municipal facilities have been assessed, possible ranges of payback periods for power generating mini-CHP have been determined. The specificity of operating modes of local energy sources, combination and regulation of heat and power supply loads, their advantages and disadvantages are considered.
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Hoang Mai, Nguyen, and Tran van Dung. "THE ANALYSIS OF LOCAL OSCILLATION IN THE GAS TURBINE GENERATOR CONNECTTO POWER GRID SYSTEMS USE LINEAR OBSERVER." International Journal of Engineering Technologies and Management Research 5, no. 2 (February 8, 2020): 159–69. http://dx.doi.org/10.29121/ijetmr.v5.i2.2018.159.
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The low frequency oscillation in the electrical generator connect to power grid is an important problem to control systems, especially in the gas turbine generators with high speed. The oscillation makes affect to life time, finance of operating and effect of energy process. There are many cause of the oscillation in governor speed control of power plants. They use PSS to do damping low frequency oscillation in recently [11], [12], [13], [14], [22], [23]. So PSS usually does process with delay cycle time, therefore it makes effect isn’t good result. This paper presents a method using linear in the gas turbine generator, which connects to power grid. By observe affect action of local oscillation of the power, study finds key point of oscillation time. From that, we take out decision to do prediction of damping in system and supply signal in to PSS to reduce damaging of this oscillation. Simulation results explain difference action of the system with linear observer and system without linear observer.
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Denysiuk, S., and T. Bazyuk. "EVALUATION OF ADDITIONAL LOSSES AND EFFICIENCY ELECTRICITY CONSUMPTION REGULATION IN LOCAL POWER SUPPLY SYSTEMS." POWER ENGINEERING: economics, technique, ecology, no. 3 (April 6, 2020): 7–21. http://dx.doi.org/10.20535/1813-5420.3.2020.228596.
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Peculiarities of estimation of total energy losses in electric networks and estimation of nature of electricity consumption in local power supply systems (LES) are given. The structure of additional electricity losses in LES in the presence of higher harmonics of current and voltage is carried out, the generalized schedule of instantaneous functions of current i(t), voltage u(t), and power p(t) on components. The offered indicators of an estimation of the performance of criterion of a minimum of losses of the electric power in LES allow to estimate levels of distortion of power processes at consideration both exchange processes, and at the analysis of additional losses of the electric power. The accuracy of measuring the integrated characteristics of energy exchange depending on the available levels of distortion of voltage and current signals is considered. It is shown that in order to take into account the influence of higher harmonics on the total power consumption, it is necessary to determine the change of Frize QFpower as an indicator of additional electricity losses in the presence of non-sinusoidal currents and voltages in at different ratios between the value of current and voltage of the first and higher harmonics. The evaluation of the efficiency of power consumption regulation using the Frize QF power at an arbitrary time interval, as well as the corresponding current distribution into active and reactive components are considered. The peculiarities of increasing the efficiency of power consumption regulation in LES at the cyclic change of generator parameters and load are analysed.
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Lee, Shih-Hsiung, and Chu-Sing Yang. "An intelligent power monitoring and analysis system for distributed smart plugs sensor networks." International Journal of Distributed Sensor Networks 13, no. 7 (July 2017): 155014771771846. http://dx.doi.org/10.1177/1550147717718462.
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With the growth in power demand, energy management is an important issue in the 21st century. This article proposes a smart power management framework system, which comprises three parts. Part 1: a smart plug. Controlling the switching power supply, different sensors can be mounted for different application environments. The power supply can be switched on/off automatically according to environmental changes. Added to this, it can measure voltage and current for analysis. Part 2: a smart gateway. This can act as the mediation module for communication and implement the concept of fog computing. The local inference model is built and deployed by deep learning, and the model is learned, updated, and improved continuously to increase the intelligent control efficiency. Part 3: a management platform and mobile app. This allows for data visualization and a remote control for a user interface medium for scheduling. The smart plug and smart gateway are integrated into the overall distributed sensor network, analyzing and improving the power consumption effectively. Finally, the feasibility and practicability of the overall power management framework system are described experimentally.