The Robustness of Natural Gas Energy Supply

2018 ◽  
Vol 7 (3) ◽  
pp. 57-71 ◽  
Author(s):  
Alireza Aslani ◽  
Samaneh Akbari ◽  
Sanaz Tabasi
Keyword(s):  
Natural Gas ◽  
Energy Supply ◽  
Renewable Energy Sources ◽  
National Level ◽  
Calorific Value ◽  
Energy System ◽  
Energy Sources ◽  
Dynamics Model ◽  
Energy Supply System ◽  
Expert Opinions

This article describes how affordability, acceptability, and reliability of energy supply are three important concerns for government. Due to the crude oil restrictions and its environmental impacts, a replacement of other energy sources has become more important in recent years. Natural gas is one of the replacements as a cleaner source with a more suitable calorific value than oil in comparison with other renewable energy sources. Therefore, utilization of natural gas as the main source of replacement strategies in the energy system has accelerated at the national level. However, the natural gas energy system is a complex system including different influencing and influenced variables that affect social and economic factors. This research has developed a system dynamics model to understand the complexity of the natural gas energy systems at the macro-level. The model shows the effective sub-systems of energy system with their related variables. It helps to predict the effective factors of an energy supply system based on statistics approaches. After that, three scenarios are defined based on expert opinions and the behaviors of the sub-systems in each scenario is analyzed. The approach also helps to understand unknown consequences of a decision or scenario in the energy system.

Multilevel policies for radical transition: Governance for a 100% renewable energy system

2017 ◽  
Vol 35 (7) ◽  
pp. 1218-1241 ◽  
Author(s):  
Frede Hvelplund ◽  
Søren Djørup
Keyword(s):  
Renewable Energy ◽  
Central Government ◽  
Renewable Energy Sources ◽  
District Heating ◽  
Transition Process ◽  
Energy System ◽  
Energy Sources ◽  
Energy Supply System ◽  
Specific Analysis ◽  
Geographically Distributed

Transition from the stored energy of fossil fuel-based systems to fluctuating renewable energy sources requires a fundamental change in both the energy supply system and governance arrangements. According to analyses made using the Aalborg University Energy PLAN model, the infrastructure required to handle fluctuating energy – such as goals for further expanding the exploitation of wind power towards 50% of energy consumption – necessitates the integration of power, district heating, transportation and biomass production, which should be geographically distributed. To enhance our understanding of this paradigmatic technological change, this article presents both a general analysis of the regulatory consequences and a specific analysis of the immediate challenges involved in the transition process, framed within the Danish context. The general conclusion is that the required distributed, local and regional technological energy system needs a bottom up and interactive regulatory framework, where the central government should have a more reflexive and communicative role, providing services and national coordination for an energy system that contains a large share of fluctuating renewable energy sources. A specific conclusion is that the present Danish tariff principles and energy tax system should be fundamentally altered in order to better facilitate the coordination of the heat and electricity sectors, to incentivise the creation of the necessary integration infrastructure.

scholarly journals Perspectives of energetic exports of Russia in terms of development of the renewable energy sources

2021 ◽  
Vol 296 ◽  
pp. 01007
Author(s):  
Elena Andreeva ◽  
Alla Golovina ◽  
Victoria Zakharova
Keyword(s):  
Renewable Energy ◽  
Natural Gas ◽  
Energy Supply ◽  
Renewable Energy Sources ◽  
Green Energy ◽  
Energy Carrier ◽  
Energy Sources ◽  
Energy Carriers ◽  
The World ◽  
New Energy

The changes in the sphere of the main energy sources in the world and in individual countries were highlighted; the prospects for Russian energy carriers in the global hydrocarbon market were identified. The demand for an energy carrier whose use in Germany is planned to be discontinued (coal) and the demand and competition for natural gas - Russian energy carrier that remains competitive in the conditions of “green” energy were analyzed. The Russian opportunity to save the energy supply market on the background of the new energy order are considered.

scholarly journals System of Integrated Energy Supply of Separate Facilities from Renewable Energy Sources

2017 ◽  
Vol 7 (2) ◽  
pp. 56-62
Author(s):  
N. Stoyanov ◽  
D. Abornev ◽  
S. Smirnov ◽  
A. Stoyanov
Keyword(s):  
Renewable Energy ◽  
Geothermal Energy ◽  
Energy Supply ◽  
Renewable Energy Sources ◽  
Simulation Method ◽  
Energy System ◽  
Energy Sources ◽  
Main Approach ◽  
Low Efficiency ◽  
Theory Of Graphs

Abstract The relevancy of the study is due to low efficiency of using solar and geothermal energy in the existing process schemes. In this regard, this article is aimed at revealing the possibilities of using solar and geothermal energy for the integrated energy supply of separate facilities from renewable energy sources. The mathematical simulation method based on the theory of graphs of energy system operation, which makes it possible to analyze the efficiency of the integrated use of solar and geothermal energies for the heat-cold supply of separate facilities, is the main approach to studying this problem. Energy consumption throughout the year and the emergency energy source capacity in “peak” modes were determined based on the developed mathematical model of managing the system of integrated power supply of separate facilities from renewable energy sources plotted with the use of the theory of graphs. The article materials are of practical value for the designers of the systems of integrated heat-cold supply of separate facilities.

scholarly journals Exergy and economic optimization of complex power supply systems

2020 ◽  
pp. 5-14
Author(s):  
B. Draganov ◽  
◽  
A. Mishenko ◽  
Keyword(s):  
Energy Supply ◽  
Renewable Energy Sources ◽  
Optimal Solution ◽  
Oriented Graph ◽  
Energy Sources ◽  
Economic Optimization ◽  
Economic Costs ◽  
Energy Supply System ◽  
Supply Systems ◽  
Energy Supply Systems

The optimization of energy supply system becomes especially important problem in those cases where there are several different energy sources, including, e.g., renewable energy sources, and several energy sinks of different power. This problems can be solved with the use of a graph of exergy and economic expenditures for the pairwise interaction of flows. The purpose of the study is to specify the concept of exergy schedule and economic costs applied to energy supply systems (ESS). We shall interpret a graph of the exergy and economic expenditures of an ESS, having an arbitrary structure, as a bipartite graph Z such that the set of its nodes C corresponds to the heating H and heated C flows, and the set of its arcs D to a possible distribution of the exergy and economic expenditures in the corresponding elements of this ESS in the course of interaction between the heating and heated flows. A symmetric graph represents an oriented graph, whose arcs can be grouped into pairs of parallel but oppositely directed arcs. Such graphs, having no isolated nodes, are convenient for studying complex interrelated systems. If we have determined the optimal pair of elements (аі, aj), corresponding to the sequence of nodes, beginning from the root of the foretree and finishing by a suspended node, giving a matrix of unit dimension, then the obtained sequence of elements forms a single-contour system with the minimum level of exergy and economic expenditure. For finding the optimal solution it is advisable to use the method of branches and boundaries, which enables one to improve the solution simpler than with the application of different methods of exergy analysis.

scholarly journals Robust Design of a Future 100% Renewable European Energy Supply System with Hydrogen Infrastructure

2020 ◽  
Author(s):  
Dilara Caglayan ◽  
Heidi U. Heinrichs ◽  
Martin Robinius ◽  
Detlef Stolten
Keyword(s):  
System Design ◽  
Energy Supply ◽  
Renewable Energy Sources ◽  
Cost Optimization ◽  
Energy System ◽  
Total Annual Cost ◽  
Optimization Approach ◽  
Energy Supply System ◽  
Robust System ◽  
The Impact

In light of the latest trends in global installed capacities, the importance of variable renewable energy sources (VRES) to future energy supply systems is evident. Despite this, the inherent intermittency of VRES remains an obstacle to their widespread adoption. Green hydrogen is often suggested as an energy carrier that can account for this in a sustainable manner. In the analysis, a robust European energy system in the context of 2050 and with 100% VRES energy supply is designed through an iterative minimal cost-optimization approach that ensures robust security of supply over 38 weather-year scenarios (1980-2017). The impact of spatial VRES variability is factored in by defining exclusive VRES groups within each optimization region and, from this, it can be seen that higher numbers of groups in each region offer cheap electricity generation locations to the optimizer and thus decrease the total annual cost of the system. Beyond this, the robust system design and impact of inter-annual variability is identified by iteratively combining the installed capacities of different system designs obtained by applying 38 historical weather years. The robust system design outlined here has significantly lower capacities in comparison to the maximum regional capacities obtained in the first round of optimization.

scholarly journals Development of expert assessment methods in planning energy supply of buildings with renewable energy sources

2021 ◽  
Vol 2 (2(58)) ◽  
pp. 51-54
Author(s):  
Olha Boiko ◽  
Vira Shendryk ◽  
Yuliia Parfenenko ◽  
Petr Pavlenko ◽  
Yevhenii Kholiavka
Keyword(s):  
Decision Making ◽  
Information System ◽  
Renewable Energy ◽  
Power System ◽  
Energy Supply ◽  
System Analysis ◽  
Renewable Energy Sources ◽  
Energy System ◽  
Energy Sources ◽  
Expert Evaluation

The object of research is the process of expert evaluation in planning the energy supply of buildings using renewable energy sources. The conducted research is based on the application of system analysis methods to formalize the process of expert evaluation in the planning of an energy system with renewable energy sources. Here were used methods of expert evaluation of characteristics of qualitative criteria, methods of the theory of fuzzy sets and fuzzy logic for the formation of the value of criteria, and methods of estimating the reliability of the expert evaluation. Methods of structural analysis and functional modelling of information systems are used to build structural and functional models of the expert evaluation process. The issue of creating an appropriate information system for planning a power system with renewable energy sources is considered. One of the components of the information system is the unit for evaluating candidate experts. A six-level algorithm of the hierarchical structure of expert selection is proposed. As a result of the algorithm, an expert group is formed. This paper shows the process of narrowing the circle of experts from twenty to three candidates. The list of criteria influencing the choice of experts is formed: length of service, availability of the certificate, the efficiency of decision-making, education. The process of assessing the stability of experts' opinions is shown. It is proposed to use the method of processing the opinions of experts to find the value of the membership functions of qualitative criteria. As a result of the study, a group of three experts was formed, whose opinions are taken into account when choosing alternatives to the energy system. In accordance with the proposed information technology of energy supply planning of buildings using renewable energy sources, an information system in the form of a web-oriented application is proposed. A separate part of the information system is a subsystem for working with experts. The diagram of sequence of actions of the expert and the interface of work with system is developed. The use of the information system allowed to increase the efficiency of questionnaires of experts and decision-making on the choice of the optimal structure of the power system as a whole.

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