scholarly journals ANALYSIS OF ELECTROMECHANICAL POWER TRANSFORMERS APPLIED IN SMALL HYDROENERGETICS / MAŽOJOJE HIDROENERGETIKOJE NAUDOJAMŲ ELEKTROMECHANINIŲ JĖGOS TRANSFORMATORIŲ ANALIZĖ

2018 ◽  
Vol 10 (0) ◽  
pp. 1-4
Author(s):  
Mariam Saghatelyan ◽  
Marija Meišutovič-Akhtarieva
Keyword(s):  
Electric Power ◽  
Power Supply ◽  
Climatic Condition ◽  
Fish Farming ◽  
Power Transformers ◽  
Small Hydropower ◽  
Power Sources ◽  
Ecological Damage ◽  
Hydropower Plants ◽  
Different Types

At present, in Armenia, hydraulic resources of slow-flowing rivers allow to solve the problem of power supply to small consumers rather efficiently. The electric power generated in small hydropower plants has the lowest prime cost in comparison with that of the power generated by other renewable and traditional power sources. At their construction, in contrast to powerful hydropower plants, the ecological damage (land flooding, destruction of fish farming, the change in the balance of the local climatic condition, etc) are practically excluded. In the present work, issues on applying different types of electric generators in small hydroenergetics are considered. The main advantages, disadvantages and also recommendations on applying electrical generators at their utilization in small hydropower plants are introduced. The developed external damper system for the synchronous hydro aggregate is introduced.

scholarly journals Model and Simulation of Permanent Magnets Synchronous Machine (PMSM) of the Electric Power Supply System (EPS), in Accordance with the Concept of a More Electric Aircraft (MEA)

2018 ◽  
Vol 16 ◽  
pp. 03004 ◽  
Author(s):  
Lucjan Setlak ◽  
Rafał Kowalik
Keyword(s):  
Power System ◽  
Electric Power ◽  
Power Supply ◽  
Power Supply System ◽  
Permanent Magnets ◽  
Synchronous Generator ◽  
Supply System ◽  
Power Sources ◽  
Electric Aircraft ◽  
More Electric Aircraft

Based on the mathematical model of synchronous electric machine, basing on permanent magnets, presented in this paper, the key importance of alternator AC power sources in the form of generator (for conventional aircraft) and in the form of integrated unit starter/AC synchronous generator S/G AC (with respect to advanced aircraft concept in the field of more/all electric power MEA/AEA) was highlighted. In addition, through the analysis and selected simulations of the power supply system of a modern aircrafts, sources of onboard electrical energy (synchronous generator, integrated unit starter/AC generator) were located in board autonomic power system ASE (EPS, PES). Key components of this system are the electro-energetic power system EPS and the energo-electronic power system PES. Additionally, the analysis and exemplary simulations of key electricity sources based on mathematical models have contributed to highlighting the main practical applications in line with the trend of a more electric aircraft.

scholarly journals Selected Problems In Controlling On-Board Direct And Alternating Current Systems

2015 ◽  
Vol 36 (1) ◽  
pp. 109-130
Author(s):  
Andrzej Gębura ◽  
Tomasz Tokarski
Keyword(s):  
Electric Power ◽  
Failure Rate ◽  
Power Supply ◽  
Electrical Power ◽  
Alternating Current ◽  
Power Network ◽  
Correct Operation ◽  
Power Sources ◽  
Electrical Loads ◽  
Current Systems

AbstractThe article addresses in a complex way the problem of cooperation between the on-board electric power sources of an aircraft with its on-board electric network. The authors paid special attention to conditions related to correct switching of the on-board electric power sources. Structural protection of the electric power sources against harmful impact of loads, and of the loads against incorrectly operating sources, as well as certain methods to counteract such phenomena, are discussed. Exploring these relations will enable the user to undertake actions which can reduce the failure rate of the on-board electrical power network, and ensure power supply to the electrical loads under all flight conditions. Their correct operation determines correct operation of the on-board electrical power network. The authors tried to discuss all the problems in the most universal way possible, so the deliberations presented here could be helpful in analyzing defects in various aircrafts.

scholarly journals Recloser-Based Decentralized Control of the Grid with Distributed Generation in the Lahsh District of the Rasht Grid in Tajikistan, Central Asia

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3673
Author(s):  
Anvari Ghulomzoda ◽  
Aminjon Gulakhmadov ◽  
Alexander Fishov ◽  
Murodbek Safaraliev ◽  
Xi Chen ◽  
...  
Keyword(s):  
Power Supply ◽  
Renewable Energy Sources ◽  
Automated System ◽  
Normal Operation ◽  
Small Scale ◽  
Stable Operation ◽  
System Control ◽  
Small Hydropower ◽  
Power System Control ◽  
Hydropower Plants

Small-scale power generation based on renewable energy sources is gaining popularity in distribution grids, creating new challenges for power system control. At the same time, remote consumers with their own small-scale generation still have low reliability of power supply and poor power quality, due to the lack of proper technology for grid control when the main power supply is lost. Today, there is a global trend in the transition from a power supply with centralized control to a decentralized one, which has led to the Microgrid concept. A microgrid is an intelligent automated system that can reconfigure by itself, maintain the power balance, and distribute power flows. The main purpose of this paper is to study the method of control using reclosers in the Lahsh district of the Rasht grid in Tajikistan with distributed small generation. Based on modified reclosers, a method of decentralized synchronization and restoration of the grid normal operation after the loss of the main power source was proposed. In order to assess the stable operation of small hydropower plants under disturbances, the transients caused by proactive automatic islanding (PAI) and restoration of the interconnection between the microgrid and the main grid are shown. Rustab software, as one of the multifunctional software applications in the field of power systems transients study, was used for simulation purposes. Based on the simulation results, it can be concluded that under disturbances, the proposed method had a positive effect on the stability of small hydropower plants, which are owned and dispatched by the Rasht grid. Moreover, the proposed method sufficiently ensures the quality of the supplied power and improves the reliability of power supply in the Lahsh district of Tajikistan.

scholarly journals Wind and Solar Radiation Potential Assessment in Kano, Nigeria Using Weibull and Samani Models

2018 ◽  
Vol 17 (1) ◽  
pp. 21-27
Author(s):  
Mustapha Mudasiru ◽  
Mohd Wazir Mustafa
Keyword(s):  
Wind Speed ◽  
Solar Radiation ◽  
Solar Energy ◽  
Electric Power ◽  
Power Supply ◽  
Global Solar Radiation ◽  
Horizontal Surface ◽  
Average Wind Speed ◽  
Power Sources ◽  
Average Wind

A clean, source free, environmentally friendly and renewable source of energy such as wind and solar energy can be used for providing sustainable power supply to remedy an epileptic and unreliable power supply systems. For decades, electric power supply situation in Kano, Nigeria has been a major source of serious concern. The epileptic power supply has hindered the socio-economic growth industrialization and, subsequently, increase air pollution due to individual stand-alone diesel generators. Various government incentives and policies have little or no effect to improve the availability and reliability of the electric power. The aviation industries especially the Navigation and communication equipment required, apart from availability, a reliable power sources because of their sensitivity to reliable and safe Aircraft navigation. The need for an alternate renewable energy system (RES) of power supply away from the National grid and diesel generator is inevitable at Kano. This paper proposes an assessment of wind and solar energy potentialities at Kano in Nigeria using Weibull distribution methods and the Samani model to determine the wind features and estimate global solar radiation potentials respectively for power supply generation. A six years (2009-2014) monthly mean wind speed data measured at 10 m height was collected and extrapolated to 50 m height level for statistical analysis, while 22 years monthly solar radiation, temperature amplitude and relative humidity of the location were obtained from NASA web to calibrate, validate and evaluate the Samani model, ten years (2003-2012) maximum and minimum temperature were then used to predict the global solar radiation on horizontal surface of the location. The minimum Weibull average wind speed was found to be 8.60 m/s and the maximum average wind speed was 11.24 m/s while the minimum power density was 440.03 W/m2 and the highest was 947.26 W/m2 at the 10 m height level. The lowest average global solar radiation on the horizontal surface was 17.96 MJ/m2/d and highest average global solar radiation on the horizontal surface was 26.38 MJ/m2/d. The site has been found to have great potentials for wind and solar utility power generation capacity.

scholarly journals A Study on the Economic Feasibility of Stand-Alone Microgrid for Carbon-Free Island in Korea

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1913
Author(s):  
Hun Mun ◽  
Byunghoon Moon ◽  
Soojin Park ◽  
Yongbeum Yoon
Keyword(s):  
Power Systems ◽  
Greenhouse Gas ◽  
Electric Power ◽  
Power Supply ◽  
Greenhouse Gas Emission ◽  
Economic Feasibility ◽  
Power Sources ◽  
Small Areas ◽  
Renewable Power ◽  
The Government

The power industry is rapidly changing as demand for eco-friendly and stable power supply increases along with global greenhouse gas emission regulations. Small-capacity renewable power sources represented by photovoltaics and wind are continuously increasing as a form of microgrid to supply electric power to a community or island. As a result, microgrids based on renewable resources have come into wide usage around small areas or islands in Korea. In particular, the microgrid development policy of Korea is focused on electric power quality, as well as expansion in renewable energy supply for reducing greenhouse gas emissions. From 2009, the government began to develop independent carbon-free microgrids with photovoltaic and wind powers instead of traditional power diesel generators for small islands. The goal of this paper is to investigate a feasible economic microgrid topology for implementing the carbon-free island (CFI) under an acceptable level of reliability. First, we derive three scenarios of power systems including photovoltaics, wind, battery, and fuel cells. Next, we assess economic feasibility on top of the power supply reliability of the scenarios. Then, we perform a sensitivity test to suggest economic conditions for achieving the CFI goals. Finally, we present carbon-free-based microgrid models considering the CFI policy of Korea.

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