scholarly journals CFD Performance Analysis of a Dish-Stirling System for Microgeneration

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1142
Author(s):  
Davide Papurello ◽  
Davide Bertino ◽  
Massimo Santarelli
Keyword(s):  
Renewable Energy Sources ◽  
Electrical Energy ◽  
Energy System ◽  
Mean Value ◽  
Stirling Engine ◽  
Solar Concentrator ◽  
Isothermal Method ◽  
First Order ◽  
A Value ◽  
Alpha Type

The sustainable transition towards renewable energy sources has become increasingly important nowadays. In this work, a microgeneration energy system was investigated. The system is composed of a solar concentrator system coupled with an alpha-type Stirling engine. The aim was to maximize the production of electrical energy. By imposing a mean value of the direct irradiance on the system, the model developed can obtain the temperature of the fluid contained inside the Stirling engine. The heat exchanger of the microgenerator system was analyzed, focusing on the solar coupling with the engine, with a multiphysical approach (COMSOL v5.3). A real Stirling cycle was implemented using two methods for comparison: the first-order empirical Beale equation and the Schmidt isothermal method. Results demonstrated that a concentrator of 2.4 m in diameter can generate, starting from 800 W/m2 of mean irradiance, a value of electrical energy equal to 0.99 kWe.

scholarly journals Power flow management analysis using compensating techniques for managing congestion within electrical energy network

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Jalpa Jobanputra ◽  
Chetan Kotwal
Keyword(s):  
Power Flow ◽  
Renewable Energy Sources ◽  
Electrical Energy ◽  
Energy System ◽  
Congestion Management ◽  
Power Lines ◽  
Distributed Network ◽  
Flow Management ◽  
Voltage Quality ◽  
Shunt Series

AbstractIn a deregulated electrical energy system with increasing penetration of renewable energy sources, rescheduling of the power generation(s) is required, and it is going to congest some of the power lines in the complex power system. The power flow can be managed using different compensating techniques. This study presents power flow management analysis using selected compensation technologies (i.e. series, shunt, series-shunt, and D-FACTS) for congestion alleviation. In this work, an IEEE 6 bus distributed network is used and the mentioned compensating techniques are evaluated for congestion management considering a case of power line outage. It is observed some of the power lines are overloaded by 10%. To reduce the overloading; the series, shunt, series-shunt, D-FACTS compensation technologies are used and found that they can reduce the active power overloading of the congested line by 27%, 9.5%, 12%, and 27% respectively. But the apparent power congestions can be reduced using series and D-FACTS techniques by 14% compare to shunt and series-shunt techniques. It is affirmed that the D-FACTS can effectively manage the power flow compare to other compensation techniques and can offer other benefits (e.g. voltage quality, line power flows, injection of power at the buses, reduction in power losses, etc.).

scholarly journals A High Standard Isolated Insolated Photovoltaic Egyptian Safari Rest Red Sea Area

2008 ◽  
Author(s):  
Faten H. Fahmy
Keyword(s):  
Renewable Energy ◽  
Red Sea ◽  
Renewable Energy Sources ◽  
High Standard ◽  
Electrical Energy ◽  
Energy System ◽  
Remote Communities ◽  
Energy Needs ◽  
Egyptian Government ◽  
Sea Area

Where renewable energy sources, solar, hydro, wind are available the remote communities and businesses can be provided with the most reliable and affordable source of electrical energy. This paper presents a model of safari rest contains all the necessary services for the interested tourists who visit the safari Sinai desert. The PV energy system provides the rural energy needs of remote communities. A photovoltaic renewable energy system is designed to feed the global Ac and Dc electrical required load of this safari rest. The benefits of photovoltaic renewable energy at rural applications are its versatility and convenience. This model of safari rest must be taken in consideration by Egyptian Government as it will provide the tourism plane by new interested tourism field which put a big spot on Red sea area: El Ghordaka.

scholarly journals Techno-Economic Analysis of Power-to-Heat Systems

2021 ◽  
Vol 238 ◽  
pp. 03003
Author(s):  
Alberto Vannoni ◽  
Alessandro Sorce ◽  
Alberto Traverso ◽  
Aristide Fausto Massardo
Keyword(s):  
Large Scale ◽  
Renewable Energy Sources ◽  
Large Fraction ◽  
District Heating ◽  
Electrical Energy ◽  
Energy System ◽  
Heat Pumps ◽  
Point Of View ◽  
Thermal Source ◽  
Economic Point

The heating and cooling sector, responsible for a large fraction of greenhouse emissions, may have a large scale impact on the energy system evolution contributing to smart industrial and domestic electrification; at the same time the recent increase of renewable energy sources installation, posing a threat in terms of grid stability, makes available a considerable amount of clean and cheap electrical energy during peak hours production. Power to heat technologies constitute a promising solution to face both these issues reducing the electric demand variability and decarbonizing the heat production. Large vapor compression heat pumps are a reliable technology able to compete, under the economic point of view, with the heat-only-boilers in order to serve district heating networks. Performance and economic profitability of a compression cycle is strongly dependent on available thermal source and the temperature of water delivered to the network. The present work explores and compares performance and economic indicators under different installation conditions, considering compression heat pumps employing four different fluids: a traditional HCF (R134a) and three natural fluids, ammonia (R717), butane (R600), and propane (R290), often preferred nowadays to HCFs due to the lower global warming potential.

scholarly journals Development of a power transformer model for high-frequency transient phenomena

2021 ◽  
Vol 19 ◽  
pp. 217-221
Author(s):  
L. Braña ◽  
◽  
A. Costa ◽  
R. Lopes
Keyword(s):  
Transmission Lines ◽  
Power Transformer ◽  
Renewable Energy Sources ◽  
Electrical Energy ◽  
Energy System ◽  
Operating Conditions ◽  
Critical Element ◽  
Electrical Networks ◽  
Transient Phenomena ◽  
Transformer Model

In recent years, the proliferation of distributed renewable energy sources and the application of new rules for the exploitation of electrical networks imposed by the markets have dictated increasingly demanding operating conditions for electric power transformers, creating new challenges in their exploration and conservation. Transformers that, in addition to the transmission lines, are certainly the most important and critical element of any electrical energy system. Adequate models are necessary to accurately describe transformer behavior and internal response when submitted to different external requests imposed by the network, particularly during transient phenomena, as well as, to properly assess system vulnerabilities and network optimization. This effort is being carried out today by several research groups in the world, namely from Cigré and IEEE. In this work, a transformer model to be integrated into a timedomain equivalent circuit is developed and discussed. Results obtained with this model are compared with measurements obtained by the Cigré JWG A2/C4.52 in a power transformer used as a reference for the working group.

scholarly journals Design of an Emergency Energy System for a City Assisted by Renewable Energy, Case Study: Latakia, Syria

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3138 ◽  
Author(s):  
Ghaeth Fandi ◽  
Vladimír Krepl ◽  
Ibrahim Ahmad ◽  
Famous Igbinovia ◽  
Tatiana Ivanova ◽  
...  
Keyword(s):  
Developing Countries ◽  
Renewable Energy ◽  
Transmission Lines ◽  
Urban Areas ◽  
Renewable Energy Sources ◽  
Electrical Energy ◽  
Energy System ◽  
Developed Countries ◽  
High Energy ◽  
Energy Sources

Electrical energy is one of the most important daily needs. Shortage of energy can be very dangerous for any society. This can affect the standard of living and quality of life of the people and even endanger the lives of those in hospitals, and so forth. Developed countries do not face such risks in general because they have well organized electrical systems and high energy security. The developing countries are faced daily with electric system collapses, especially in the case of wars, where many parts of the electrical grid in the country can be damaged and fuel transmission lines for generators cut off. Urban areas in developing countries should have a strategic plan to deal with any unexpected occurrence of energy shortages using any available renewable energy sources. City of Latakia is located in the region which has been suffering from the consequences of war for more than six years. The fact that a high number of migrants from other cities have come to Latakia along with a lack of fuel makes the energy shortage in the city worse. An emergency system could use the cheapest available renewable energy sources in addition to few big portable generators to provide an acceptable energy supply for the most needed requirements of daily life.

scholarly journals Comparison of Control Strategies to Realize Synthetic Inertia in Converters

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3491 ◽  
Author(s):  
Jürgen Marchgraber ◽  
Christian Alács ◽  
Yi Guo ◽  
Wolfgang Gawlik ◽  
Adolfo Anta ◽  
...  
Keyword(s):  
Power Plants ◽  
Control Strategies ◽  
Power Grid ◽  
Renewable Energy Sources ◽  
Electrical Power ◽  
Electrical Energy ◽  
Energy System ◽  
Frequency Stability ◽  
Synchronous Generators ◽  
Scope Of Application

The increasing amount of renewable energy sources in the electrical energy system leads to an increasing number of converter-based generators connected to the electrical power grid. Other than conventional power plants that are often connected to the grid via synchronous generators, converter-based generators do not provide mechanical inertia intrinsically. Therefore, ensuring frequency stability in the electrical power grid might become even more difficult in the future. With the concept of synthetic inertia, the converter-based generators partially imitate the behavior of conventional generators. By implementing such a concept in converters, they are capable of contributing to frequency stability as well. This paper compares two strategies to realize synthetic inertia by modeling converter-based generators in MATLAB/SIMULINK and simulating their behavior in a small Microgrid. The results prove that any kind of realization of synthetic inertia helps to improve frequency stability. Each of the two investigated strategies may have their scope of application in a future electrical energy system.

scholarly journals Hybrid Energy Network Management: Simulation and Optimisation of Large Scale PV Coupled with Hydrogen Generation

Electronics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1734
Author(s):  
Marco Cerchio ◽  
Francesco Gullí ◽  
Maurizio Repetto ◽  
Antonino Sanfilippo
Keyword(s):  
Large Scale ◽  
Hydrogen Generation ◽  
Renewable Energy Sources ◽  
Supply And Demand ◽  
Primary Source ◽  
Electrical Energy ◽  
Energy System ◽  
Mixed Integer ◽  
Electrical Networks ◽  
Hybrid Energy

The power production of electrical Renewable Energy Sources (RES), mainly PV and wind energy, is affected by their primary source of energy: solar radiation value or wind strength. Electrical networks with a large share of these sources must manage temporal imbalances of supply and demand. Hybrid Energy Networks (HEN) can mitigate the effects of this unbalancing by providing a connection between the electricity grid and and other energy vectors such as heat, gas or hydrogen. These couplings can activate synergies among networks that, all together, increase the share of renewable sources helping a decarbonisation of the energy sector. As the energy system becomes more and more complex, the need for simulation and optimisation tools increases. Mathematical optimisation can be used to look for a management strategy maximising a specific target, for instance economical, i.e. the minimum management cost, or environmental as the best exploitation or RES. The present work presents a Mixed Integer Linear Programming (MILP) optimisation procedure that looks for the minimum running cost of a system made up by a large-scale PV plant where hydrogen production, storage and conversion to electricity is present. In addition, a connection to a natural gas grid where hydrogen can be sold is considered. Different running strategies are studied and analysed as functions of electricity prices and other forms of electrical energy exploitation.

Stirling Engines Powered by Renewable Energy Sources

2016 ◽  
Vol 831 ◽  
pp. 263-269
Author(s):  
Jacek Kropiwnicki ◽  
Aleksandra Szewczyk
Keyword(s):  
Renewable Energy ◽  
Low Temperature ◽  
Electric Power ◽  
Mechanical Energy ◽  
Renewable Energy Sources ◽  
Electrical Energy ◽  
Stirling Engine ◽  
Working Fluid ◽  
Energy Sources ◽  
Stirling Engines

Stirling engine is a device that produces mechanical energy using heat from any source of energy, without the need of combustion of any fuel inside the device. Renewable energy sources, which are mostly low-temperature energy sources, can be used to produce mechanical and electrical energy in Stirling engines. The paper presents an overview of the existing prototype Stirling engines designed for using of low-temperature energy sources, including renewable energy sources. Commercial devices for electric power generation offered for use in home, usually do not exceed 1 kW. Using the Schmidt model, the analyze of influence of temperature working fluid in the expansion space (heater) on the efficiency and the electric power generated in the Stirling engine of alpha type has been presented in the paper.

scholarly journals Thermal Energy Storage for Grid Applications: Current Status and Emerging Trends

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 340 ◽  
Author(s):  
Diana Enescu ◽  
Gianfranco Chicco ◽  
Radu Porumb ◽  
George Seritan
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
System Integration ◽  
Renewable Energy Sources ◽  
Energy Systems ◽  
Electrical Energy ◽  
Energy System ◽  
Current Status ◽  
Emerging Trends ◽  
Grid Applications

Thermal energy systems (TES) contribute to the on-going process that leads to higher integration among different energy systems, with the aim of reaching a cleaner, more flexible and sustainable use of the energy resources. This paper reviews the current literature that refers to the development and exploitation of TES-based solutions in systems connected to the electrical grid. These solutions facilitate the energy system integration to get additional flexibility for energy management, enable better use of variable renewable energy sources (RES), and contribute to the modernisation of the energy system infrastructures, the enhancement of the grid operation practices that include energy shifting, and the provision of cost-effective grid services. This paper offers a complementary view with respect to other reviews that deal with energy storage technologies, materials for TES applications, TES for buildings, and contributions of electrical energy storage for grid applications. The main aspects addressed are the characteristics, parameters and models of the TES systems, the deployment of TES in systems with variable RES, microgrids, and multi-energy networks, and the emerging trends for TES applications.

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