scholarly journals Counter-rotating electric generator for wind power plants with liquid metal energy transfer

2021 ◽  
Vol 2094 (5) ◽  
pp. 052018
Author(s):  
A V Egorov ◽  
Yu F Kaizer ◽  
A V Lysyannikov ◽  
A V Kuznetsov ◽  
V G Shram ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Power Plants ◽  
Electric Energy ◽  
Electrical Energy ◽  
Temperature Limit ◽  
Specific Power ◽  
Metal Contact ◽  
Electric Generator ◽  
Wind Power Plants ◽  
Friction Mode

Abstract The problem of creating effective structures that ensure mutual rotation of the rotor and stator of an electric generator. The wide practical application of counter-rotor wind-electric generators, which provide a significant increase in specific power, is hindered by the disadvantages and low reliability of existing systems for removing electric energy from the windings of a rotating counter-rotor, due to the dry friction mode. It is possible to increase the reliability of the contact removal of electrical energy from the counter rotor (rotating stator) by replacing solid brushes with liquid metal contact groups, which will lead to a certain increase in the resistivity of the contact group, compensated by the contact area of the liquid metal with the contact ring. It is most advisable to use liquid metal contact groups based on gallium, which will raise the permissible temperature limit of operation by about 2 times compared to the achieved level to 275 °C and, thereby, additionally raise the specific power of the electric generator.

RESTORABLE ENERGY SOURCES AS A FACTOR OF THE COMPETITIVE IMPROVEMENT ABILITY OF A TOURIST DESTINATION

2007 ◽  
Vol 14 (2) ◽  
pp. 263-270
Author(s):  
Daniela Gračan ◽  
Romina Alkier Radnić ◽  
Siniša Bogdan
Keyword(s):  
Power Plants ◽  
Market Price ◽  
Electric Energy ◽  
Energy Sources ◽  
Energy Costs ◽  
Tourist Destination ◽  
Wind Power Plants ◽  
The Right ◽  
Tourist Economy ◽  
The Town

Energy supply represents not only the energetic and ecological undertaking factor of tourist economy bearers, but the factor of profitability and competitiveness within the foreign tourist market as well. Lower energy costs form the prerequisites for higher profit accomplishments, as well as better market price competitiveness. Instead of exploiting natural resources, tourism should make the most of them, which brings into relief the directing of tourist economy subjects towards the use of restorable energy sources, particularly solar and wind energy. In spite of favourable climate features of Croatia, expressed in terms of insulation and windstrength, the restorable energy sources are still used rather insignificantly. Some positive moves in such a trend are noticeable on the island of Pag and in the town of Sibenik, where the electric energy is obtained in wind power-plants. In accordance with the concept of sustainable development of tourism, both solar energy and wind-mill energy should represent the skeleton for the energetic supply of the Croatian tourist coastline in the future. And only then, with the right amount of energy and without dependence on the world energetic markets, Croatia can develop its own healthy economic and tourist future.

scholarly journals Torrefied Biomass as an Alternative in Coal-Fueled Power Plants: A Case Study on Grindability of Agroforestry Waste Forms

2020 ◽  
Vol 2 (3) ◽  
pp. 270-289 ◽  
Author(s):  
Leonel J. R. Nunes
Keyword(s):  
Power Plants ◽  
Large Scale ◽  
Electric Energy ◽  
Electrical Energy ◽  
Empirical Methods ◽  
Biomass Waste ◽  
Waste Forms ◽  
Good Potential ◽  
Definition Of ◽  
Hardgrove Grindability Index

The use of biomass as a renewable energy source is currently a reality, mainly due to the role it can play in replacing fossil energy sources. Within this possibility, coal substitution in the production of electric energy presents itself as a strong alternative with high potential, mostly due to the possibility of contributing to the decarbonization of energy production while, at the same time, contributing to the circularization of energy generation processes. This can be achieved through the use of biomass waste forms, which have undergone a process of improving their properties, such as torrefaction. However, for this to be viable, it is necessary that the biomass has a set of characteristics similar to those of coal, such that its use may occur in previously installed systems. In particular, with respect to grindability, which is associated with one of the core equipment technologies of coal-fired power plants—the coal mill. The objective of the present study is to determine the potential of certain residues with agroforestry origins as a replacement for coal in power generation by using empirical methods. Selected materials—namely, almond shells, kiwifruit pruning, vine pruning, olive pomace, pine woodchips, and eucalyptus woodchips—are characterized in this regard. The materials were characterized in the laboratory and submitted to a torrefaction process at 300 °C. Then, the Statistical Grindability Index and the Hardgrove Grindability Index were determined, using empirical methods derived from coal analysis. The results obtained indicate the good potential of the studied biomasses for use in large-scale torrefaction processes and as replacements for coal in the generation of electrical energy. However, further tests are still needed, particularly relating to the definition of the ideal parameters of the torrefaction process, in order to optimize the grindability of the materials.

scholarly journals A Review on Wind Turbine and Wind Generator Used in WECS

2019 ◽  
pp. 01-04
Author(s):  
Nitish Kumar Singh ◽  
Dashrath Kumar
Keyword(s):  
Energy Source ◽  
Wind Energy ◽  
Wind Turbine ◽  
Power Quality ◽  
Power Plants ◽  
Harmonic Distortion ◽  
Energy Resource ◽  
Electrical Energy ◽  
Wind Power Plants ◽  
Core Energy

The applications of wind energy develop much rapidly than the other renewable resources such as solar, geothermal and so on in the 21st century. It becomes the third core energy resource following non-conventional fuels as oil and chemical. Electrical energy generated by wind power plants is the best ever developing and most promising renewable energy source. The wind is a clean, free and limitless energy source. Wind Energy Generation Systems (WECS) are confront with increasing demands for power quality and harmonic distortion control. With the advance in power electronics technology, the fast growth of variable speed WECS is now witness. However, the power quality still remains an important issue to be addressed thoroughly by researchers. This paper presents a comparative study on grid connected WECS having two different Wind Turbine Generator Systems (WTGS) using DFIG and PMSG.

Design Advancement, Parameters, and Modes of High Power Turbo Generators

2017 ◽  
Author(s):  
Коган ◽  
Feliks Kogan
Keyword(s):  
Power Systems ◽  
High Power ◽  
Nuclear Power ◽  
Power Plants ◽  
Electrical Energy ◽  
Local Heat ◽  
Specific Power ◽  
System Control ◽  
Modes Of Operation ◽  
Power System Control

Turbo generators installed at the thermal and nuclear power plants produce about 85% of the electrical energy generated in the world. High power turbo generators have higher specific power normalized to the volume, and, as a result, higher tensions in the machine structure and increased sensitivity to switching between the modes of operation. Disruptions in turbo generator standard modes of operation cause increase in electrical currents, significant local heat increase as well as large electrodynamic stresses. The book discusses the improvement of design of Russian turbo generators and how their parameters impact the machine reliability; the book provides analysis of specifics of the abnormal modes of operation, and their limits and the risk of miscounting of these limits in the power system control; the book also discusses the modeling of turbo generators. The book is recommended as a textbook for college and university students, who study Power and Electrical Engineering, engineering and technical staff of power plants and power systems as well as professionals involved in the design and testing of turbine generators.

The Utilization Potential of Rice Husk as an Alternative Energy Source for Power Plants in Indonesia

2013 ◽  
Vol 845 ◽  
pp. 494-498 ◽  
Author(s):  
Muhammad Anshar ◽  
Ab Saman Abd Kader ◽  
Farid Nasir Ani
Keyword(s):  
Rice Husk ◽  
Alternative Energy ◽  
Power Plants ◽  
Electric Energy ◽  
Electrical Energy ◽  
Alternative Fuel ◽  
Rice Production ◽  
Steam Power Plants ◽  
Coal Fuel ◽  
Energy Needs

The utilization of rice husk as an alternative fuel for the power plant in Indonesia is still under study. In present, steam power plants in Indonesia are still using coal fuel. This study was conducted to obtain data on the development potential of rice husk within 12 years duration. The potential of rice husk for each province was obtained by analyzing the rice production of 22 provinces that have rice production greater than 1 million tons per year. The study shows that the potential of rice husk and potential electrical energy increased by about 36.8% within 12 years or an average increase of around 3.1% per year. For the potential of rice husk in 22 provinces, the total gain was estimated 12.76 × 106 tons which is equivalent to 6.62 × 106 tons of coal or equivalent to 3.68 × 106 tons of oil. The available capacity of power plants is around 5,664 MW with the potential of electric energy is around 49,622 GWh. This potential is equivalent to 50% of the energy needs of coal in Indonesia in 2011, which was about 99,312 GWh. In conclusion, rice husk is indeed potential to be used as an alternative fuel in power plants thanks to its increasing yearly production and ability for distribution to all provinces in Indonesia.

scholarly journals Automatic Control System for Hybrid Electrical Energy Supply Based on Internet of Things

2021 ◽  
Vol 1 (2) ◽  
pp. 34-44
Author(s):  
M. Edwin Syah Effendy ◽  
RD Kusumanto ◽  
Carlos RS
Keyword(s):  
Renewable Energy ◽  
Power Plants ◽  
Low Cost ◽  
Electrical Energy ◽  
Local Society ◽  
Wind Power Plants ◽  
C Programming ◽  
Solar Power Plants ◽  
Electric Source ◽  
Different Sources

The utilization of renewable energy is slowly starting to become one thing that to be interesting inside the development of science technology. The utilization of renewable energy is from at least two renewable energy (Solar Power Plants and Wind Power Plants), State Electricity Enterprise (PLN), and Generator Sources. This device could be operated automatically and integrated on the internet, which has a monitoring system such as voltage, inside which will be used to control everything inside that system. This device is designed to be operated in a combinational manner. This means to be operated based on the voltage value which qualified to activate the load. The utilization of the 3.3V microcontroller is able to design an efficient and low-cost board. Besides that, the device also uses the PLN and Generator set sources as the power backup when the main power runs out. Base on the research noted, this device will distribute the electric source to the houses, which means beneficial for the local society. This device might be applied automatically to four different sources with C++ Programming language to set the point value.

scholarly journals Valorization of potentials of wind energy in Montenegro

2017 ◽  
Vol 21 (5) ◽  
pp. 1893-1903 ◽  
Author(s):  
Radoje Vujadinovic ◽  
Esad Tombarevic ◽  
Uros Karadzic
Keyword(s):  
Wind Energy ◽  
Power Plants ◽  
Electric Energy ◽  
Electrical Energy ◽  
Annual Production ◽  
Wind Fields ◽  
Energy Potential ◽  
Hydro Power ◽  
Technical Data ◽  
Mean Values

Investments in energy sector are usually long term processes both in construction and exploitation phase, and therefore require many conditions to be satisfied, mostly from legislative and technical sector. While the legislative can change in accordance with economy activities in the country, technical data (on-site measurements) which are the main base for energy facility design, need to be reliable as much as possible. Wind energy has a significant global potential which exceeds the world?s electrical energy consumptions. This paper presents the estimation of wind energy potentials in Montenegro, based on all previous available studies in this field. The wind energy potential in Montenegro is based on a combination of 3-D numerical simulations of wind fields on the entire territory, and comprehensive on-site measurements. The preliminary studies show that there is a potential of areas with high and mean values of a capacity factor about 400 MW, and annual production of 900 GWh of electric energy. The share of wind parks in the total installed power in Montenegro is planned to be about 8%, while an adequate ratio of wind parks in an annual production from renewable sources (large hydro power plants are included here) is estimated to be 11.4%. The paper presents the current state of art in the field of building of wind parks in Montenegro. A particular attention was paid to the legislation framework and strategic documents in the energy area in Montenegro.

scholarly journals PEMANFAATAN POTENSI ANGIN LAUT PENGGERAK MESIN PERAHU NELAYAN PENGGANTI MESIN BERTENAGA MINYAK

2014 ◽  
Vol 12 (1) ◽  
pp. 62-64
Author(s):  
Budi Prijo Sembodo ◽  
Rony Haendra Fora ◽  
Sri Widyastuti
Keyword(s):  
Wind Energy ◽  
Power Plants ◽  
Fossil Fuels ◽  
Electrical Energy ◽  
Engine Oil ◽  
Development Economic ◽  
Wind Power Plants ◽  
The Right ◽  
Engine Method ◽  
Economic Improvement

Wind Power Plants convert wind energy into electrical energy using wind turbines orwindmills. The problem is when in season Mitra wind / west season , fishermen catching crabs cannot directly capture crabs . The process can wait for days , until the right time to spread the net.When should wait for the weather improves fuel becomes a major problem . Fishermen do nothave the ability to purchase fuel in bulk .Results KKN PPM Theme : minimation   fuel problem ,known as fossil fuels , the use of the traditional mindset change boat engine oil into the enginefueled with energy saving environmentally friendly energy alternatives that are cheaper , achievededucation for sustainable development , economic improvement occurred residents by selling theproducts of wind energy boat engine. Method in empowerment , operational steps to correct theproblem, the volume of work in the form of JKEM and the total volume of work

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