scholarly journals Free-Flow Tunnel Inspection Support Devices Aiming at Labor Saving of Visual Checking

2020 ◽  
Vol 32 (4) ◽  
pp. 832-839
Author(s):  
Kazunori Hosotani ◽  
◽  
Hirofumi Yamamoto
Keyword(s):  
Power Plants ◽  
Free Flow ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Autonomous Operation ◽  
Support Device ◽  
Tunnel Inspection ◽  
Tottori Prefecture ◽  
Maintenance Work ◽  
Support Devices

Small and medium-sized hydroelectric power plants are scattered in mountainous areas of Japan. Many tunnels that have been constructed for the purpose of introducing water have been in operation for decades, and inspections to aging deterioration are indispensable, however checks and maintenance work within the tunnels where the ceiling is low and water is flowing is very burdensome. This research aims at labor saving of visual check work of an inspector who moves through a narrow tunnel and searches for a deformed portion, and a simple imaging support device with a camera on a walking aid and autonomous operation at a constant speed in the tunnel. In this article, a prototype of a walking assist type inspection device and a self-propelled monitoring robot that creates a developed image of the wall surface are described. The prototype device is tested in a free-flow tunnel at the Tsukuyone Hydroelectric Power Station in Tottori Prefecture where water intake into the tunnel is stopped due to renewal work from 2018 to 2019, and its practicality is evaluated.

scholarly journals Prospects for the Development of Alternative Hydropower in the Krasnoyarsk Territory

2021 ◽  
pp. 97-105
Author(s):  
Konstantin S. Fediy ◽  
Sergey A. Vstovskiy ◽  
Igor S. Fedorchenko ◽  
Evgeny A. Spirin
Keyword(s):  
Kinetic Energy ◽  
Power Plants ◽  
Transmission Mechanism ◽  
Free Flow ◽  
Hydraulic Structures ◽  
Hydroelectric Power Station ◽  
Hydroelectric Dams ◽  
Hydroelectric Power ◽  
Power Station ◽  
Hydropower Plants

The disadvantage of hydroelectric dams is the flooding and a material breach of the ecology of the region, therefore the use of such hydroelectric power station is reasonable when no alternative method of providing the required power. In this regard, in most cases, it is advisable to use free-flow microelectric power plants. Free-threaded micro hydropower plants constitute a power unit mounted in the flow of the river. The main difference between free-flow microelectric power plants and dams is the use of kinetic energy of the flow, rather than potential. This makes it possible to eliminate the need for earthworks and the construction of additional hydraulic structures. Free-threaded micro hydropower plants can be grouped, forming a cascade of micro hydro. In order to increase the reliability of free-flow microelectric power plants, the design tends to use low-speed generators with rotation speeds from 140 to 650 rpm, which can significantly simplify or completely eliminate the transmission mechanism

scholarly journals MODELING OF COMPATIBLE WORK OF DISTRIBUTED POWER SOURCES OF ELECTRIC POWER AND CENTRALISED POWER SUPPLY

2018 ◽  
pp. 189-195
Author(s):  
Petro Lezhnyuk ◽  
Iryna Hunko ◽  
Juliya Malogulko ◽  
Iryna Kotylko ◽  
Lіudmyla Krot
Keyword(s):  
Power Supply ◽  
Power Plants ◽  
Solar Power ◽  
Energy Sources ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Distributed Energy ◽  
Power Stations ◽  
Asynchronous Generator ◽  
Solar Power Plants

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.

LOCAL STUDIES OF ICE COVER EFFECTS ON DAM GATES

2021 ◽  
Vol 11 (2) ◽  
pp. 62-66
Author(s):  
Sergey V. EVDOKIMOV ◽  
Alexey A. ROMANOV ◽  
Boris G. IVANOV
Keyword(s):  
Power Plants ◽  
Practical Interest ◽  
Full Scale ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Power Stations ◽  
Operation Rules ◽  
Static Operation ◽  
Technical Operation ◽  
Scale Data

The experience of operation of surface emergency gates in ice-breaking conditions at a number of hydroelectric power plants has shown the insuffi cient eff ectiveness of the methods used to combat freezing of structures. The rules for technical operation of spillway dam gates in winter provide for heating of structures by slots, threshold and skin in conjunction with measures to maintain mines before construction. However, measures to heat gates and build mines are not always suffi ciently justifi ed and justifi ed. In order to obtain full-scale data and scientifi c information for the development of recommendations on operating and accounting modes during design, full-scale studies of stresses and defl ections in the load-bearing elements of the watershed gate of the hydroelectric power station were carried out. This article presents the results of fi eld studies in comparison with calculated values. As a result of the studies, information on the static operation of fl at gates in winter conditions is obtained, which is of theoretical and practical interest. The materials can be used to clarify technical operation rules and to clarify regulatory documents for the design of hydromechanical equipment at hydroelectric power stations.

scholarly journals Application of the multiagent approach to the research of integrated energy supply systems

2019 ◽  
Vol 114 ◽  
pp. 01006
Author(s):  
Gleb Mayorov ◽  
Valery Stennikov ◽  
Eugene Barakhtenko
Keyword(s):  
Energy Supply ◽  
Power Plants ◽  
Energy Systems ◽  
Integrated System ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Large Area ◽  
Technological Infrastructure ◽  
Supply Systems ◽  
Energy Supply Systems

The current technological infrastructure in the electricity, heat, cold, and gas supply, as a rule, is formed and controlled separately by local systems and tasks. The traditionally considered energy systems unite large energy sources, such as hydroelectric power station, combined heat and power plants, boiler plants, and electric and pipeline networks distributed over a large area. New trends in the energy sector necessitate a revision of the principles of construction of energy systems and the creation of integrated energy supply systems. Combining separate different types of systems of different levels into a single integrated system with many coordinated elements can contribute to the implementation of new functionality, the use of more advanced technologies in operation and the active participation of consumers with distributed generation in the energy supply process. For the study of integrated energy supply systems it is proposed to use a multiagent approach, which is one of the promising areas of research for complex systems. This approach is used in many subject areas to study systems that include many elements with complex behavior. Such systems include integrated energy supply systems. The solution of the problem on the basis of the agent approach is developed by a multitude of interrelated agents.

THE INFLUENCE OF OPERATION CONDITIONS OF HYDROELECTRIC POWER PLANTS THE CHOICE OF THE MAIN PARAMETERS OF THE SUCTION PIPES

2015 ◽  
Vol 5 (4) ◽  
pp. 86-92 ◽  
Author(s):  
Mikhail Ivanovich BALZANNIKOV
Keyword(s):  
Power Plants ◽  
Draft Tube ◽  
Operating Conditions ◽  
Hydroelectric Power Station ◽  
Geometrical Parameters ◽  
Hydroelectric Power ◽  
Operation Conditions ◽  
Hydropower Plants ◽  
Large Water ◽  
Run Of River

Considered run-of-river hydropower plants (HPP). Notes the importance of technical-economic calculations in the justifi cation of large water-conducting elements of the path these types of HPP. The methodology of economic substantiation of the expediency of increasing the length of the draft tube. Using the technique of the calculations for lowpressure hydroelectric run-of-river type. The results of the analysis of the influence of the operating conditions of the hydroelectric power station on basic geometrical parameters of draft tube.

PROSPECTS FOR COMBINING SOLAR PLANTS WITH STRUCTURAL ELEMENTS OF ENVIRONMENTAL HYDRAULIC FACILITIES AND COMPLEXES

2021 ◽  
pp. 57-65
Author(s):  
O. N. CHERNYH ◽  
◽  
A. V. BURLACHENKO ◽  
V. V. VOLSHANIK
Keyword(s):  
Power Plants ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Structural Elements ◽  
Power Station ◽  
Optimal Arrangement ◽  
Turbine Wheel ◽  
The North ◽  
Energy Needs ◽  
Dam Building

The issues of solving modern problems related to meeting the energy needs of environmental hydraulic engineering are considered. The problem of improving the methodological basis for choosing the optimal arrangement of elements of photovoltaic devices (SPEU) on the blocks of the dam building of hydroelectric power plants (HPP) of 4 main types is formulated. The graphical dependences of the estimation of the power ratio of the combined SPEU and HPP on the diameter of the turbine wheel are analyzed. As a result of the analysis of the influence of the location of the transformer on the possibility of placing the SPEU on the buildings of the hydroelectric power station, it was revealed that in order to increase the adaptability of the revitalized even large hydro system with a separate building of the hydroelectric power station, it is preferable to place power transformers from the downstream side. It is noted that according to the results of the schematic study for the medium-pressure hydroelectric complex Lagdo in the north of Cameroon, the placement of solar cells will provide an additional 6.95% of the capacity of the operating hydroelectric power station.

ASSESSMENT OF JOINT OPERATION OF HYDRAULIC AND SOLAR POWER PLANTS OF COMPLEX HYDRAULIC UNITS

2021 ◽  
pp. 67-74
Author(s):  
O. N. CHERNYH ◽  
◽  
A. V. BURLACHENKO ◽  
V. V. VOLSHANIK ◽  
U. H. UMARU HAMANJODA
Keyword(s):  
Power Plants ◽  
Solar Power ◽  
Maximum Power ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Joint Work ◽  
Power Station ◽  
Daily Production ◽  
First Case ◽  
Solar Power Plants

The results of the assessment and analysis of the operating modes of the power complex with the constructive and technological combination of hydraulic power plants (HPPs) with solar power plants (SFEU) in the presence of seasonal or daily regulation in the environmental hydro system are presented. The aspects of the operation of a hydroelectric power station with non-self-regulating derivation are considered in detail: when working in a load schedule with a maximum power equal to the installed one, and when the average daily power along the watercourse is approaching the provided one. It was found that in the first case, the influence of the SPEU regime on the joint work with the hydroelectric power station is to move a part of the load graph of the hydroelectric power plant with the maximum power to the base part of the schedule. In the second case, the influence of the SPEU mode consists in changing the variable part of the load graph, but the HPP, in contrast to the first case, retains its position in the load graph of the power system. The mode of operation of the hydroelectric power station becomes more uniform and at the same time, a smaller volume of the daily regulation basin (DRB) is required. For the example considered, the maximum power of the hydroelectric power station during the day increased from 50 MW to 54 MW. It has been revealed that even with the production of SPEU in 18% of the daily production of hydroelectric power plants, the volume of DRB is required approximately two times less. As a result, it is possible to increase the operating head at the hydroelectric power station and obtain the corresponding effect on power and electricity generation.

scholarly journals Deciding a Multicriteria Decision-Making (MCDM) Method to Prioritize Maintenance Work Orders of Hydroelectric Power Plants

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8281
Author(s):  
Renan Favarão da Silva ◽  
Marjorie Maria Bellinello ◽  
Gilberto Francisco Martha de Souza ◽  
Sara Antomarioni ◽  
Maurizio Bevilacqua ◽  
...  
Keyword(s):  
Decision Making ◽  
Power Plants ◽  
Multicriteria Decision Making ◽  
Maintenance Management ◽  
Maintenance Planning ◽  
Hydroelectric Power ◽  
Multicriteria Decision ◽  
Maintenance Work ◽  
Mcdm Method ◽  
Work Orders

The current global competitive scenario and the increase in complexity and automation of equipment and systems demand better results from maintenance management in organizations. As maintenance resources are limited, prioritizing maintenance activities is essential to allocate them properly and to meet maintenance management objectives. In the face of these challenges, multicriteria decision-making (MCDM) methods are commonly used in organizations to support decision-making. Nevertheless, selecting a suitable MCDM method for maintenance planning can be complicated given the diversity of methods and their strengths and weaknesses. In this context, this paper proposes a novel knowledge-based method for deciding a multicriteria decision-making (MCDM) method to prioritize maintenance work orders of hydroelectric plants. As the main novel contribution, it translates the intrinsic characteristics of the main MCDM methods into questions related to maintenance planning to guide the recommendation of a suitable MCDM method for organizations through a decision tree diagram. This approach was applied to a maintenance case study of a hydroelectric power plant in order to demonstrate its use and contribute to its understanding. These findings contribute to maintenance management in selecting an MCDM method aligned with the context of its maintenance planning for the prioritization of maintenance work orders.

scholarly journals DEVELOPMENT AND TESTING OF A HYDROCYCLONE SAND TRAP FOR MINI HPP

2021 ◽  
Vol 445 (1) ◽  
pp. 91-97
Author(s):  
Zh. K. Kassymbekov ◽  
G. Zh. Kassymbekov
Keyword(s):  
Power Plants ◽  
Flow Simulation ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Technological Parameters ◽  
Power Station ◽  
Treatment Unit ◽  
Sand Trap ◽  
The Cost ◽  
Clarified Water

The goal of the project is to develop and use a hydrocyclone sand trap to improve the operation of a mini hydroelectric power station. In contrast to the existing design of a similar type of hydroelectric power station, a bulky sump for water purification has been replaced with an efficient hydrocyclone device. Due to this, a simplification of the design of the HPP is achieved, an increase in the degree of sand collection from the composition of the water used. Research methods. The initial data for the calculation were taken: the flow rate of water passing through the hydrocyclone and the pressure drop at the inlet and outlet of the hydrocyclone. Computer simulation of the process was carried out using the SolidWorks software (flow simulation). The main technological parameters and a rational mode of operation were established by testing experimental samples both in laboratory and in production conditions. Research results. In the established mode, the density of clarified water is equal to 1.009 ... 1.050 t / m3, and the degree of purification is 91 ... 97%. Replacing a bulky reinforced concrete sump with hydrocyclone sand traps of a simplified design reduces the cost of building a water treatment unit from 30% (existing) to 7%. This makes it possible to expand the volume of development of small hydroelectric power plants, especially in mountainous conditions.

scholarly journals RESERVOIRS OF DIVERSION HYDRO POWER PLANTS AND THE APPLICATION OF ALLUVIUM FOR THE PRODUCTION OF BUILDING MATERIALS

2021 ◽  
Author(s):  
М. Н. Кокоев
Keyword(s):  
Power Plants ◽  
Building Materials ◽  
Water Discharge ◽  
River Sediments ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
North Caucasus ◽  
Mountain Rivers ◽  
Large Reservoir ◽  
Hydro Power

В горных реках Северного Кавказа расход воды в паводок увеличивается в десятки раз. Часто в горных условиях технически проще и дешевле построить не плотинную станцию с большим водохранилищем, а деривационную ГЭС с небольшим водохранилищем или с бассейном суточного регулирования. Горные реки несут большое количество песка и ила. Во время паводков вода переносит и мелкие камни, и гальку. Если не принимать мер для очистки от речных наносов водохранилищ, то через несколько лет полезный объем водохранилищ будет исчерпан. В статье рассматривается один из способов поддержания водохранилищ и бассейнов суточного регулирования в рабочем состоянии. Предложено речные наносы (аллювий) регулярно извлекать из водохранилищ, обрабатывать и использовать как сырье для производства строительных песчано-гравийных смесей и щебня. Есть большая потребность в этих материалах при строительстве автомобильных дорог, в промышленном и гражданском строительстве. Одновременно можно использовать тонкие фракции аллювия в виде ила, глины и тонкого песка в качестве основы для приготовления почвенного субстрата с целью применения его для улучшения пойменных земель. Обсуждаются вопросы организации при водохранилищах каскада ГЭС на горных реках механизированных участков по утилизации донных отложений. In the mountain rivers of the North Caucasus, the water discharge during a flood increases tenfold. Often, in mountainous conditions, it is technically easier and cheaper to build a derivation hydroelectric power station with a small reservoir or with a daily regulation pool than a dam station with a large reservoir. Mountain rivers carry large amounts of sand and silt. During floods, the water carries lots of small stones and pebbles. If no measures are taken to cleanse reservoirs from river sediments, their useful volume would be exhausted in a few years of operation. The article discusses one of the ways to maintain reservoirs and basins of daily regulation in working order. It is proposed that river sediments (alluvium) be regularly removed from reservoirs, processed and used as raw materials for the production of construction sand and gravel mixtures and crushed stone. The demand for these materials in the construction of highways, in industrial and civil construction is high. At the same time, it is possible to use fine fractions of alluvium in the form of silt, clay and fine sand as a basis for preparing a soil substrate to improve floodplain lands. The issues of organizing mechanized teams for utilization of bottom sediments at reservoirs of a cascade of hydroelectric power stations on mountain rivers are discussed.

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