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.

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.

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.

Socio-environmental and Economic Problems of Solar Panels Recycling

2020 ◽  
pp. 48-55
Author(s):  
Olena I. Matsenko ◽  
Vladyslav S. Tereshchenko ◽  
Vladyslav S. Piven ◽  
Andrii A. Panchenko ◽  
Evhenyi A. Perekhod
Keyword(s):  
Renewable Energy ◽  
Alternative Energy ◽  
Power Plants ◽  
Solar Power ◽  
Negative Impact ◽  
Renewable Energy Sources ◽  
Economic Problem ◽  
Energy Sources ◽  
Solar Power Plants ◽  
Technical Specifications

The use of alternative energy sources, in particular solar energy, has gained rapid growth in recent years. This trend is prompting manufacturers of equipment for solar power plants to increase production volumes. At the same time, the question arises of the disposal of used modules, because each material has its service life. According to technical specifications, the average life of solar modules and batteries is 25-30 years. Decommissioning may occur earlier than this time due to the following reasons – moral and physical deterioration, mechanical damage, replacement of obsolete equipment with new, modernization of solar power plants. Already in 2030, it will be necessary to replace the solar modules installed in 2000. Therefore, there are acute questions not only regarding the development of technologies for processing waste equipment from solar power plants but also organizational and economic methods. This article discusses the main problems that arise during the utilization and recycling of solar modules, analyzes the experience of countries in resolving these issues. After all, the use of renewable energy sources should minimize the negative impact on the environment from energy production at all stages – from the production of equipment for a power plant to the disposal and recycling of this equipment. Keywords: solar panel, recycling, economic method, solar power, natural resource, economic problem, environment, renewable energy.

scholarly journals The Role of Local Citizen Energy Communities in the Road to Carbon-Neutral Power Systems: Outcomes from a Case Study in Portugal

Smart Cities ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 840-863
Author(s):  
Hugo Algarvio
Keyword(s):  
Power Systems ◽  
Electricity Markets ◽  
Power Plants ◽  
Large Scale ◽  
Solar Power ◽  
Hydroelectric Power ◽  
Solar Power Plants ◽  
Carbon Neutral

Global warming contributes to the worldwide goal of a sustainable carbon-neutral society. Currently, hydroelectric, wind and solar power plants are the most competitive renewable technologies. They are limited to the primary resource availability, but while hydroelectric power plants (HPPs) can have storage capacity but have several geographical limitations, wind and solar power plants have variable renewable energy (VRE) with stochastic profiles, requiring a substantially higher investment when equipped with battery energy storage systems. One of the most affordable solutions to compensate the stochastic behaviour of VRE is the active participation of consumers with demand response capability. Therefore, the role of citizen energy communities (CECs) can be important towards a carbon-neutral society. This work presents the economic and environmental advantages of CECs, by aggregating consumers, prosumers and VRE at the distribution level, considering microgrid trades, but also establishing bilateral agreements with large-scale VRE and HPPs, and participating in electricity markets. Results from the case-study prove the advantages of CECs and self-consumption. Currently, CECs have potential to be carbon-neutral in relation to electricity consumption and reduce consumers’ costs with its variable term until 77%. In the future, electrification may allow CECs to be fully carbon-neutral, if they increase their flexibility portfolio.

scholarly journals Study on Dust Deposition Mechanics on Solar Mirrors in a Solar Power Plant

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4550 ◽  
Author(s):  
Xueqing Liu ◽  
Song Yue ◽  
Luyi Lu ◽  
Jianlan Li
Keyword(s):  
Power Plants ◽  
Solar Power ◽  
Renewable Energy Sources ◽  
Dust Particles ◽  
Particle Collision ◽  
Energy Sources ◽  
Solar Power Plant ◽  
Dust Deposition ◽  
Research Results ◽  
Solar Power Plants

Solar energy is considered to be one of most promising renewable energy sources because of its availability and cleanliness. The phenomenon of dust deposition on solar mirrors greatly reduces the power generation of solar power plants. In this work, the motion behaviors and deposition mechanics of dust particles are analyzed by the discrete element method (DEM). The effects of environmental and solar mirror conditions and particle self-factors on dust deposition weight are systematically studied here. The research results show that dust particles, after particle collision, immediately adhere to the mirror or rebound and finally flow away from the mirror, or they otherwise may remain stationary after making some relative motion. Alternatively, they may glide for some distance and finally come to rest on the mirror or leave from the system. Different motion behaviors after particle collision depend on different leading forces. Here, the leading forces are the liquid bridge force (Fc) and the contact force (Fb). When the leading forces are Fc, or Fc, and Fb, the dust particles will be deposited on the solar mirror. Besides, the force Fc cannot be negligible when studying the motion processes of dust particles. The dust deposition weight on solar mirrors can be controlled by altering the environmental and solar mirror conditions, and particle self-factors. In essence, dust deposition weight on solar mirrors decreases when decreasing the leading force Fc or increasing the leading force Fb. The research results give theoretical guidance for the prevention and removal of dust deposition on solar mirrors.

scholarly journals Pemasangan Lampu Jalan dan Pembangunan Pembangkit Listrik Berbasis Solar Cell Sebagai Prototype Pembelajaran Energi Terbarukan Di MA Al-Khairiyah Rancaranji

TERANG ◽  
2020 ◽  
Vol 3 (1) ◽  
pp. 100-105
Author(s):  
Septianissa Azzahra ◽  
Samsurizal Samsurizal ◽  
Christiono Christiono ◽  
Miftahul Fikri
Keyword(s):  
Renewable Energy ◽  
Solar Cell ◽  
Solar Energy ◽  
Electric Power ◽  
Power Supply ◽  
Power Plants ◽  
Solar Power ◽  
Daily Life ◽  
Street Lighting ◽  
Solar Power Plants

Renewable energy, especially solar power plants (PLTS), is now begin to develop their applications to many forms, such as: installed as a home power supply, power supply for buildings, and also as power supply for street lighting (solar street light). Madrasah Aliyah Al-Khairiyah Rancranji In this regard, as a partner, demand a socialization and a study for their students to understand more about renewable energy topics especially about solar energy. And the limited electric power is also one of the problems for this school. Therefore, PKM activity in Madrasah Aliyah Al-Khairiyah Rancaranji is a solution given by the PKM team by providing learning and an introduction of renewable energy as well as workshop and installation of PLTS and road lamps based on solar cell. Results gained after the implementation of this activity are students understand and knows about the renewable energy, its application and its benefits in daily life.

scholarly journals The influence of solar energy on the development of the mining industry in the Republic of Cuba

2021 ◽  
Vol 249 ◽  
pp. 427-440
Author(s):  
Yaroslav Shklyarskiy ◽  
Daniel Díaz Guerra ◽  
Emiliia Iakovleva ◽  
Anton Rassõlkin
Keyword(s):  
Solar Energy ◽  
Power Plants ◽  
Solar Power ◽  
Mining Industry ◽  
Energy System ◽  
Hydroelectric Power ◽  
Tracking Systems ◽  
Solar Tracking ◽  
Solar Power Plants ◽  
The Republic

Cuba is traditionally considered a country with an underdeveloped industry. The share of the mining and metallurgical industries in the gross industrial production of the republic is small – about 3 % of GDP. The development of deposits and the extraction of nickel ores is an important sector of the economy of the Republic of Cuba, since the largest reserves of nickel and cobalt on the North American continent are located on the territory of the country. The development of the country energy system can serve as a growth factor in this sector of the economy. Due to climatic features and impossibility of integrating new capacities into the energy system through the construction of hydroelectric power plants, solar energy is a promising direction. Determining the feasibility of using solar tracking systems to increase the generation of electricity from solar power plants is one of the main challenges faced by engineers and renewable energy specialists. Currently, there are no solar tracking systems in Cuba that can provide information to assess the effectiveness of this technology in the country. The lack of the necessary technologies, as well as the high cost of developing solar power plants with tracking systems, limit the widespread introduction of such complexes. Hence follows the task of creating an inexpensive experimental model that allows assessing the effectiveness of tracking systems in specific weather conditions of the Republic of Cuba. This model will allow in future to increase the efficiency of electrical complexes with solar power plants, which provide power supply to the objects of the mineral resource complex and other regions.

Prospects of Сreating Аloating Solar Power Plants in Russia

2020 ◽  
Vol 144 ◽  
pp. 126-135
Author(s):  
Evgenii S. Khristoforov ◽  
◽  
Konstantin K. Il’kovskii ◽  
Keyword(s):  
Solar Energy ◽  
Power Plants ◽  
Solar Power ◽  
Open Water ◽  
Electrical Energy ◽  
Hydroelectric Power ◽  
Advantages And Disadvantages ◽  
New Methods ◽  
Hydroelectric Power Plants ◽  
Solar Power Plants

Technologies for converting solar energy into electrical energy are constantly improved, new methods of using solar energy are emerging in order to increase efficiency and save space. One of such methods is application of special buoyancy modules and restraints systems for installing solar power plants in water basins. The main technologies and operation principle of floating solar power plants (SPP) are described. Advantages and disadvantages of using floating solar power plants in comparison with ground-based solar power plants are listed and substantiated. Assessment of potential of installing floating SPP at hydroelectric power plants (HPP) in Russia is given. Prospects for the use of floating SPP in open water areas are discussed and examples of such projects are listed.

scholarly journals Economic Analysis of Cedar Plantation Management and Mega-Solar Replacement

Forests ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 361
Author(s):  
Shizu Itaka
Keyword(s):  
Ecosystem Services ◽  
Forest Management ◽  
Power Plant ◽  
Power Supply ◽  
Power Plants ◽  
Solar Power ◽  
Wood Chip ◽  
Economic Incentives ◽  
Solar Power Plant ◽  
Solar Power Plants

Technology related to solar power as a renewable energy resource has increased in recent years. However, in Japan, forestland has been converted into mega-solar power plants with more than 1 MW photovoltaic capacity and such conversions raise significant concerns as they degrade forest ecosystem services. In this study, the profit and power supplies generated by a mega-solar power plant and a cedar (Cryptomeria japonica) plantation were evaluated. The profit for the cedar plantation was estimated from saw log and wood chip production, and its power supply was estimated from wood chip production alone. These figures were based on an optimal forest management strategy that was generated using a dynamic programming model. In this numerical simulation, it was found that the power supply from the mega-solar power plant was 50–150 times more than that from the cedar plantation. Regarding profit, it was found that the simulated mega-solar power plant provided NPV (net present value) of 8.5–90.6 MM JPY (Japanese Yen)/1–3 ha (0.1–3.0 MM JPY/ha/year), while the forest management simulation generated an NPV of 29,863 JPY/ha/year (for one timber rotation) and SEV (soil expectation value) of 3.6 MM JPY/ha at most. To avoid the conversion of forests into mega-solar power plants, this difference provides a basis for the cost of maintaining forests for ecosystem services and potential economic incentives.

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