Conference on Scientific Research, Design, Construction, and Operation of Hydraulic Tunnels and Underground Hydroelectric Power Stations

1967 ◽  
Vol 1 (3) ◽  
pp. 282-290 ◽  
Author(s):  
N. Ya. Vainshtein
2020 ◽  
Vol 223 ◽  
pp. 03002
Author(s):  
Gachenko Andrey ◽  
Hmelnov Alexey

In this work, the authors present a technology for riverside terrain model building that has been tested on a number of scientific projects to study the littoral area of tail race of the Irkutsk Hydroelectric Power Station and the Bratsk Reservoir. This model is used for forecasting changes in the reservoir shorelines associated with wastewater in the cascade of hydroelectric power stations. The technology described in the work was approved to solve a number of practical problems and showed its effectiveness. Specialized application software was developed and terrain data from various sources were used to specify and detail the end result.


Author(s):  
Petro Lezhnyuk ◽  
Iryna Hunko ◽  
Juliya Malogulko ◽  
Iryna Kotylko ◽  
Lіudmyla Krot

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.


Author(s):  
Andriy Karanda

The problem of creating a landscape environment considering the cultural and educational orientation in the structure of objects of the landscape and recreational zone of cities is observed. Specialized cultural and cognitive parks of ideological and thematic orientation are grouped by areas: urban planning, landscape-ecological, spatial-compositional, semiotic, typological-methodological and their main characteristics are given. The classification of specialized cultural and cognitive parks and those that ideologically affect the surrounding and inner world of man is given. The main methods used in the formation of specialized cultural and educational parks in the process of landscape-planning organization of the park environment by its phases (pre-design research, design, implementation, maintenance) are determine In each of the phases the main stages of its implementation and methods of scientific research used in it are given. When considering the issue of creating specialized cultural and cognitive parks, the general criteria to be met by the design objects that combine them were identified, a number of methods that form the algorithm for their creation were considered.


Author(s):  

The paper considers changes in temperature regime of rivers flowing northerner than 60th latitude. The investigation bases on data about average monthly water temperatures from 90 hydrological gages for the period 1960-2012. Annual water temperatures for this period were calculated according to the generally accepted method as average monthly temperature from May to September and according to the proposed in this paper calculation method for the entire period with positive water temperatures. It is shown that the calculation of annual water temperatures only from the average monthly temperatures from May to October, underestimates annual water temperature. The paper estimates changes in the average annual water temperatures calculated by both methods over the period 1991–2012 compared to 1961-1990 These periods cover intensive climate change, as well as the time after the construction of the largest hydroelectric power stations. Statistical analyzes of the obtained series for trends (according to the Spearman rank correlation test) and series uniformity disturbances (Mann-Whitney U-test) were carried out. A significant increase in the average annual water temperatures in rivers on most rivers of the Russian Arctic is shown. The greatest changes are observed in the territories of Yakutia. Significant changes are also noted on the Kola Peninsula. At the same time, the magnitude of the changes depends on various hydrological characteristics of the basin. Significant changes to date have occurred in less than 50% of the investigated rivers.


Author(s):  
Tatyana Avdjieva

This work is a part of research on the microstructure and mechanical properties of Cr-Ni-Si steels after various thermal treatments [1, 2]. The need to minimize damage and losses caused by emerging failures in complex engineering facilities such as nuclear, thermal and hydroelectric power stations, and gas and oil pipelines necessitates the creation of materials of high strength, plasticity, welding and high rigidity.


2021 ◽  
Vol 11 (2) ◽  
pp. 62-66
Author(s):  
Sergey V. EVDOKIMOV ◽  
Alexey A. ROMANOV ◽  
Boris G. IVANOV

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.


Author(s):  
Helaine Maria De Souza Pontes ◽  
Celia FIinck Brandt ◽  
Ana Luiza Ruschel Nunes

O objeto de estudo deste trabalho de investigação consiste em saber como a Teoria dos Registros de Representação Semiótica se evidencia nas pesquisas científicas brasileiras, portanto tem como objetivo revelar o nível de abrangência, objeto matemático, procedimentos metodológicos e aspectos da teoria de Duval mais recorrentes nestas pesquisas. Desta forma, trata-se de uma pesquisa bibliográfica com delineamento do estado da arte. Os resultados apresentados demonstram a predominância da Educação Básica; a variedade dos objetos matemáticos; o destaque tanto das Sequências Didáticas quanto das Atividades Matemáticas como procedimentos metodológicos utilizados e as transformações de tratamento e conversão como aspectos da teoria de Duval mais evidentes nas pesquisas mapeadas. The object of study of this research is how the Theory of Semiotics Representation Registers is evident in Brazilian scientific research therefore aims to reveal the level of coverage, mathematical object, methodological procedures and aspects of Duval most prevalent theory in these research. In this way, it is a bibliographical research design with state of the art. The results show the predominance of Basic Education; the variety of mathematical objects; the highlight of both sequences as Teaching of Mathematics activities as methodological procedures used and the treatment and conversion transformations as aspects of the more obvious Duval theory most evident in the mapped research. 


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