Determination of Power Flows in Microgrids with Renewable Energy Sources by Using Special Computer Programs

2020 ◽  
Vol 56 (2) ◽  
pp. 149-155
Author(s):  
J. O. Izzatillaev
Keyword(s):  
Renewable Energy ◽  
Renewable Energy Sources ◽  
Computer Programs ◽  
Energy Sources

scholarly journals Influence of the Share of Renewable Energy Sources on the Level of Energy Security in EECCA Countries

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 903 ◽  
Author(s):  
Ivan Trifonov ◽  
Dmitry Trukhan ◽  
Yury Koshlich ◽  
Valeriy Prasolov ◽  
Beata Ślusarczyk
Keyword(s):  
Renewable Energy ◽  
Energy Security ◽  
Structural Characteristics ◽  
Renewable Energy Sources ◽  
Energy Resource ◽  
Energy Sources ◽  
Structural Content ◽  
High Degree

In this study we aimed to determine the extent to which changes in the share of renewable energy sources, their structural complex, and the level of energy security in Eastern Europe, Caucasus and Central Asia (EECCA) countries in the medium- and long-term are interconnected. The study was performed through modeling and determination of the structural characteristics of energy security in the countries. The methodology of the approach to modeling was based on solving the problem of nonlinear optimization by selecting a certain scenario. For the study, the data of EECCA countries were used. The ability of EECCA countries to benefit from long-term indirect and induced advantages of the transformation period depends on the extent to which their domestic supply chains facilitate the deployment of energy transformation and induced economic activity. This study provides an opportunity to assess the degree of influence of renewable energy sources on the level of energy security of countries in the context of energy resource diversification. The high degree of influence of renewable energy sources on energy security in the EECCA countries has been proven in the implementation of the developed scenarios for its increase. Energy security is growing. At the same time, its level depends not only on an increase in the share of renewable sources but also on the structure of energy resources complex of countries, and the development of various renewable energy sources. Therefore, today the EECCA countries are forced not only to increase the share of renewable energy sources but also to attach strategic importance to the structural content of their energy complex.

scholarly journals Interaction Boundary Determination of Renewable Energy Sources to Estimate System Strength Using the Power Flow Tracing Strategy

2021 ◽  
Vol 13 (3) ◽  
pp. 1569
Author(s):  
Namki Choi ◽  
Byongjun Lee ◽  
Dohyuk Kim ◽  
Suchul Nam
Keyword(s):  
Renewable Energy ◽  
Power Flow ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
Test Results ◽  
Boundary Determination ◽  
Actual Interaction ◽  
Power Flow Tracing ◽  
Estimate System

System strength is an important concept in the integration of renewable energy sources (RESs). However, evaluating system strength is becoming more ambiguous due to the interaction of RESs. This paper proposes a novel scheme to define the actual interaction boundaries of RESs using the power flow tracing strategy. Based on the proposed method, the interaction boundaries of RESs were identified at the southwest side of Korea Electric Power Corporation (KEPCO) systems. The test results show that the proposed approach always provides the identical interaction boundaries of RESs in KEPCO systems, compared to the Electric Reliability Council of Texas (ERCOT) method. The consistent boundaries could be a guideline for power-system planners to assess more accurate system strength, considering the actual interactions of the RESs.

scholarly journals Wind Data Analysis and Wind Flow Simulation Over Large Areas

2014 ◽  
Vol 10 (1) ◽  
pp. 38-45
Author(s):  
Angel Terziev ◽  
Ivan Antonov ◽  
Rositsa Velichkova
Keyword(s):  
Renewable Energy ◽  
Wind Energy ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
Wind Flow ◽  
Energy Potential ◽  
Wind Potential ◽  
Wind Energy Potential ◽  
The Impact

Abstract Increasing the share of renewable energy sources is one of the core policies of the European Union. This is because of the fact that this energy is essential in reducing the greenhouse gas emissions and securing energy supplies. Currently, the share of wind energy from all renewable energy sources is relatively low. The choice of location for a certain wind farm installation strongly depends on the wind potential. Therefore the accurate assessment of wind potential is extremely important. In the present paper an analysis is made on the impact of significant possible parameters on the determination of wind energy potential for relatively large areas. In the analysis the type of measurements (short- and long-term on-site measurements), the type of instrumentation and the terrain roughness factor are considered. The study on the impact of turbulence on the wind flow distribution over complex terrain is presented, and it is based on the real on-site data collected by the meteorological tall towers installed in the northern part of Bulgaria. By means of CFD based software a wind map is developed for relatively large areas. Different turbulent models in numerical calculations were tested and recommendations for the usage of the specific models in flows modeling over complex terrains are presented. The role of each parameter in wind map development is made. Different approaches for determination of wind energy potential based on the preliminary developed wind map are presented.

scholarly journals Characteristic Properties of Alternative Biomass Fuels

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1448 ◽  
Author(s):  
Martin Lisý ◽  
Hana Lisá ◽  
David Jecha ◽  
Marek Baláš ◽  
Peter Križan
Keyword(s):  
Renewable Energy ◽  
Water Content ◽  
Elemental Analysis ◽  
Renewable Energy Sources ◽  
Fuel Properties ◽  
Energy Sources ◽  
Heating Value ◽  
Lower Heating Value ◽  
Lower Heating

Biomass is one of the most promising renewable energy sources because it enables energy accumulation and controlled production. With this, however, the demand for biofuels grows and thus there is an effort to expand their portfolio. Nevertheless, to use a broader range of biofuels, it is necessary to know their fuel properties, such as coarse and elemental analysis, or lower heating value. This paper presents the results of testing the fuel properties of several new, potentially usable biofuels, such as quinoa, camelina, crambe, and safflower, which are compared with some traditional biofuels (wood, straw, sorrel, hay). Moreover, the results of the determination of water content, ash, and volatile combustible content of these fuels are included, along with the results of the elemental analysis and the determination of higher and lower heating values. Based on these properties, it is possible to implement designs of combustion plants of different outputs for these fuels.

TOURISM AS A PATHWAY FOR RES UTILISATION

2007 ◽  
Vol 14 (2) ◽  
pp. 281-290
Author(s):  
Biljana Kulišić ◽  
Margareta Zidar ◽  
Branka Jelavić ◽  
Julije Domac ◽  
Velimir Segon
Keyword(s):  
Renewable Energy ◽  
Renewable Energy Sources ◽  
Ghg Emissions ◽  
Energy Sources ◽  
Export Sector ◽  
Goods And Services ◽  
Multiplier Effect ◽  
Eu Energy Policy ◽  
The Eu

Tourism, due its property of being an “invisible export” sector, has a strong multiplier effect over the economy. Tourists boost demand for numerous goods and services, one of them being energy. Unfortunately, energy sources are scarce for most of the countries in the region. Thus, one could think of another solution to the excess demand for energy than import. Namely, for more than a decade, renewable energy sources are in the central focus of the EU energy policy with an aim to ensure security, price stability, availably and affordability of energy to its citizens together with reduction of GHG emissions and making the EU economy more competitive. Combining tourism with renewable energy sources utilisation helps reducing the spill over effect from energy import. In this paper, the cross-section analysis based on environmental determination of tourism and renewable energy sources potentials is performed in order to indicate a pathway for implementation of renewable energy sources utilisation in the tourism and hotel industry.

scholarly journals Features of determination of the potential of renewable energy sources in the conditions of iron ore enterprises

2018 ◽  
Vol 23 (2) ◽  
pp. 25-29
Author(s):  
Oleh Mykolaiovych Sinchuk ◽  
Serhii Mykolaiovych Boiko ◽  
Yurii Mykolaiovych Shmelov
Keyword(s):  
Renewable Energy ◽  
Iron Ore ◽  
Renewable Energy Sources ◽  
Energy Sources
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