scholarly journals The instability analysis of electricity generation of renewable energy sources, taking into account their technical condition

2020 ◽  
Vol 3 (59) ◽  
pp. 108-116
Author(s):  
O. Rubanenko
Keyword(s):  
Renewable Energy ◽  
Power System ◽  
Electricity Generation ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Fuzzy Model ◽  
Technical Condition ◽  
Main Element ◽  
Energy Sources ◽  
Photovoltaic Module

The relevance of the transition from traditional to renewable energy sources is investigated in the paper. The most popular renewable energy sources (RES) for Ukraine and the World are highlighted. The trend of changing electricity generation by photovoltaic stations is analyzed. Peculiarities of the functioning of electric networks with RES are considered. A mathematical model of the problem of optimal control of the parameters of the normal mode of the power system (PS) with a high level of integration of photovoltaic power plants (PPS) is presented. The main components of the criterion of optimality in the control of the power system, which must be taken into account when determining it. The article investigates in more detail such a component of the optimality criterion as power equivalent to the loss due to power failure caused by unstable generation. The instability of RES generation, in particular, FES, can be caused by both unpredictable changes in meteorological factors and changes in the technical condition of FES equipment. The photovoltaic module is the main element of any FES, so the article focuses on determining the technical condition of the FEM. Therefore, the main study presented in the article is the development of a neuro-fuzzy model to determine the technical condition of the FEM, which is represented by the coefficient of the total residual resource. For this purpose, the characteristic fault to the FEM, in particular, the fault to the frame of the FEM is analyzed and presented; the fault to cable insulation; the consequences of increasing resistance and heating of the contacts at the junction of the cell busbar FEM; the decrease to the impermeability of the FEM and others.

scholarly journals Transient Impact Analysis of High Renewable Energy Sources Penetration According to the Future Korean Power Grid Scenario

2018 ◽  
Vol 10 (11) ◽  
pp. 4140 ◽  
Author(s):  
Seungchan Oh ◽  
Heewon Shin ◽  
Hwanhee Cho ◽  
Byongjun Lee
Keyword(s):  
Renewable Energy ◽  
Power System ◽  
Electric Power ◽  
Power Plants ◽  
Transient Stability ◽  
Impact Analysis ◽  
Renewable Energy Sources ◽  
Electric Power System ◽  
Energy Sources ◽  
The Impact

Efforts to reduce greenhouse gas emissions constitute a worldwide trend. According to this trend, there are many plans in place for the replacement of conventional electric power plants operating using fossil fuels with renewable energy sources (RESs). Owing to current needs to expand the RES penetration in accordance to a new National power system plan, the importance of RESs is increasing. The RES penetration imposes various impacts on the power system, including transient stability. Furthermore, the fact that they are distributed at multiple locations in the power system is also a factor which makes the transient impact analysis of RESs difficult. In this study, the transient impacts attributed to the penetration of RESs are analyzed and compared with the conventional Korean electric power system. To confirm the impact of the penetration of RESs on transient stability, the effect was analyzed based on a single machine equivalent (SIME) configuration. Simulations were conducted in accordance to the Korean power system by considering the anticipated RES penetration in 2030. The impact of RES on transient stability was provided by a change in CCT by increasing of the RES penetration.

scholarly journals The Economics of Renewable Energy Sources into Electricity Generation in Tanzania

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Baraka Kichonge ◽  
Iddi S. N. Mkilaha ◽  
Geoffrey R. John ◽  
Sameer Hameer
Keyword(s):  
Renewable Energy ◽  
Energy Supply ◽  
Electricity Generation ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Primary Energy ◽  
Energy Sources ◽  
Renewable Energy Technologies ◽  
Energy Technologies ◽  
Primary Energy Supply

The study analyzes the economics of renewable energy sources into electricity generation in Tanzania. Business as usual (BAU) scenario and renewable energy (RE) scenario which enforce a mandatory penetration of renewable energy sources shares into electricity generations were analyzed. The results show total investment cost for the BAU scenario is much lower as compared to RE scenario while operating and maintenance variable costs are higher in BAU scenario. Primary energy supply in BAU scenario is higher tied with less investment costs as compared to RE scenario. Furthermore, the share of renewable energy sources in BAU scenario is insignificant as compared to RE scenario due to mandatory penetration policy imposed. Analysis concludes that there are much higher investments costs in RE scenario accompanied with less operating and variable costs and lower primary energy supply. Sensitivity analysis carried out suggests that regardless of changes in investments cost of coal and CCGT power plants, the penetration of renewable energy technologies was still insignificant. Notwithstanding the weaknesses of renewable energy technologies in terms of the associated higher investments costs, an interesting result is that it is possible to meet future electricity demand based on domestic resources including renewables.

scholarly journals Opportunities and Challenges of Flexible Electricity-Based Fuel Production for the European Power System

2020 ◽  
Vol 12 (23) ◽  
pp. 9844
Author(s):  
Maximilian Borning ◽  
Larissa Doré ◽  
Michael Wolff ◽  
Julian Walter ◽  
Tristan Becker ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Power System ◽  
Carbon Dioxide Emissions ◽  
Power Plants ◽  
Large Scale ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
Fuel Production ◽  
Climate Neutrality ◽  
The Impact

To mitigate global warming, the European Union aims at climate neutrality by 2050. In order to reach this, the transportation sector has to contribute especially, which accounts for about a quarter of the European greenhouse gas emissions. Herein, electricity-based fuels are a promising approach for reducing emissions. However, a large-scale deployment of electricity-based fuels has a significant impact on the power system due to high electricity demand and the requirement to use renewable energy sources in order to be sustainable. At the same time, this fuel production could offer additional flexibility for the power system. This article investigates the opportunities and challenges of electricity-based fuels and flexible electricity-based fuel production for the European power system. In a literature analysis, the pivotal role of electricity-based fuels for climate neutrality is confirmed. To analyze the impact of flexible fuel production, European power market simulations for the year 2035 are conducted. Results indicate that flexibilization leads to an increased integration of electricity based on renewable energy sources as well as reductions in both carbon dioxide emissions and total operational costs of the power system. However, very high flexibility levels also benefit high-emission power plants and may even lead to increased emissions.

scholarly journals Main Directions of Ensuring Energy Balance in Uzbekistan

2020 ◽  
Vol 6 (6) ◽  
pp. 230-234
Author(s):  
D. Khairova ◽  
O. Akhmedov
Keyword(s):  
Renewable Energy ◽  
Energy Balance ◽  
Power System ◽  
Electricity Generation ◽  
Alternative Energy ◽  
Renewable Energy Sources ◽  
Distribution Networks ◽  
Energy Sources ◽  
The Republic

The article discusses the problems of ensuring the energy balance in the Republic of Uzbekistan. The power system of Uzbekistan is a vertically integrated structure, which is based on sources of electricity generation and distribution networks. An important role is given in the article to the work on involving renewable energy sources in the energy balance in Uzbekistan. Data on the potential of renewable energy sources in Uzbekistan, the development of alternative energy.

scholarly journals BALANSING OF POWER AND ELECTRICITY IN THE ELECTRIC POWER SYSTEM WITH RENEWABLE ENERGY SOURCES BY CRITERIONAL METHOD

2021 ◽  
pp. 62-70
Author(s):  
Petro Lezhniuk ◽  
Olha Buslavets ◽  
Olena Rubanenko
Keyword(s):  
Renewable Energy ◽  
Power System ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Electricity Consumption ◽  
Electric Power System ◽  
Electricity Production ◽  
Energy Sources ◽  
Flexible Generation ◽  
Installed Capacity

This article considers the features of the development of renewable energy sources in electrical networks. The main changes in the functional properties of power systems, which include a significant reduction in electricity consumption, change in the structure of electricity consumption, rapid increase in the installed capacity of solar and wind power plants. Electricity consumption in 2020 is almost halved compared to 1990 (from 227 to 119 billion kWh) and as a consequence the share of semi-peak thermal generation, which gave the power system basic flexibility, has significantly decreased (from 71 % in 1990 to 35 % in 2020) and at the same time the share of nuclear generation, which operates in base mode, has increased (from 25 % to 51 %). In particular, consumption by industry with a stable load schedule, decreased (from 146 billion kWh (64 %) to 49 billion kWh (42 %)). At the same time, the demand for electricity by the households, whose consumption profile of which is characterized by significant daily unevenness and sensitivity to meteorological factors, has significantly increased (from 21 billion kWh (9 %) to 37 billion kWh (31 %)). Therefore, the article analyses the preconditions for the problem of flexible generation and explores possible ways to solve them. The optimal composition of electricity generation for Ukraine in the period 2021–2025 is proposed, which provides for the preservation and even increase by optimizing the repair campaign of the share of electricity production by nuclear power plants, the introduction of additional 2–2.5 GW of highly flexible generation and up to 2 GW storage systems (taking into account the pumped-storage power plant), as well as a gradual evolutionary decline in both installed capacity and electricity production by semi-peak coal-fired power plants and maintaining a policy of decarbonisation to ensure its own energy security. A comprehensive approach to compensating for the instability of renewable energy sources generation has been developed, which consists in minimizing the cost of power redundancy in various available ways. The problem of cost optimization for ways to compensate for the instability of renewable energy sources generation is solved by the method of criterion programming. The impact of each backup method on total costs is determined using sensitivity theory.

OPTIMASI KUALITAS DAYA HIBRID TURBIN ANGIN DAN PHOTOVOLTAIC

2019 ◽  
Vol 11 (1) ◽  
pp. 1095
Author(s):  
Zainal Abidin
Keyword(s):  
Renewable Energy ◽  
Solar Energy ◽  
Wind Turbine ◽  
Carbon Emissions ◽  
Electricity Generation ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Green Technology ◽  
Energy Sources ◽  
Solar Photovoltaic

In order to decrease fuel emissions as a staple of electricity generation, renewable energy is one of the choices in the context of green technology. Wind and solar energy are several choices of renewable energy sources that can be used as environmentally friendly power plants without carbon emissions and are cheap. The application of wind turbine and solar photovoltaic hybrids is mostly carried out in several countries, especially in the fulfillment of isolated land. The HOMER application is one application that can be used to simulate wind turbine and photovoltaic hybrids.

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