scholarly journals Power Flow Optimization Problems for Multi-Energy Systems

2021 ◽  
Vol 289 ◽  
pp. 03001
Author(s):  
Dmitry Bykov ◽  
Dmitry Efimov
Keyword(s):  
Degrees Of Freedom ◽  
Optimization Problems ◽  
Flow Distribution ◽  
Energy Systems ◽  
Minimum Cost ◽  
Energy System ◽  
Distribution Networks ◽  
Primary Energy ◽  
Energy Resources ◽  
Transmission And Distribution

Flow distribution calculation is the determination of the values of the state parameters at the nodes and connections of the system that satisfy the Kirchhoff laws. This calculation is necessary to determine the existence and admissibility of operating states in a multi-energy systems, as well as in singleproduct systems. In addition, it is an essential component of solving the problems of optimization of states in order to ensure the minimum cost of production, transmission and distribution of energy resources. Traditionally, a means of such minimization is the redistribution of the load between sources, consumers and storage of energy resources. As a consequence, this redistribution applies to the elements of transmission and distribution networks. This means are supplemented also by the possibility of converting energy resources from one type to another in multi-energy system. Covering the needs of the end consumer in different types of energy can be provided from different primary energy carriers through the chain (sequence) of their transfer and transformation from one type to another. Such a variety of the ways of energy supply, along with the possibilities of storing (accumulating) energy, pro-vides necessary degrees of freedom for solving states optimization problems.

scholarly journals Modern Solutions to Modeling and Optimization of the Steady State of Multi-Energy Systems

2020 ◽  
Vol 209 ◽  
pp. 02007
Author(s):  
Dmitry Bykov ◽  
Dmitry Efimov
Keyword(s):  
Steady State ◽  
Mathematical Models ◽  
Optimization Problems ◽  
General Structure ◽  
Flow Distribution ◽  
Energy Systems ◽  
Physical Nature ◽  
Energy System ◽  
Operating Conditions ◽  
Term Operation

A complex solution of problem of creating mathematical models of multi-energy systems is possible using a unified approach. An approach that will ensure consistent construction of mathematical models and unification of computational algorithms. The paper presents the elements of the concept of energy circuits as a basis for unified modeling of systems of different physical nature. The existing and developed approaches to solving the problems of calculating the flow distribution in multi-energy systems are presented, based on the analysis of publications on this subject. The general structure of the mathematical model of the flow distribution in a multi-energy system and the set of optimization problems for steady-state operating conditions are described. A possible formulation of the optimization problem for the short-term operation of a multi-energy system is presented.

scholarly journals Dynamic Modelling of LNG Powered Combined Energy Systems in Port Areas

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3640
Author(s):  
Davide Borelli ◽  
Francesco Devia ◽  
Corrado Schenone ◽  
Federico Silenzi ◽  
Luca A. Tagliafico
Keyword(s):  
Energy Savings ◽  
Ghg Emissions ◽  
Dynamic Modelling ◽  
Energy Systems ◽  
Energy System ◽  
Primary Energy ◽  
Time Behavior ◽  
Vapor Compression Refrigeration Cycle ◽  
Integrated Energy System ◽  
Energy Share

Liquefied Natural Gas (LNG) is a crucial resource to reduce the environmental impact of fossil-fueled vehicles, especially with regards to maritime transport, where LNG is increasingly used for ship bunkering. The present paper gives insights on how the installation of LNG tanks inside harbors can be capitalized to increase the energy efficiency of port cities and reduce GHG emissions. To this purpose, a novel integrated energy system is introduced. The Boil Off Gas (BOG) from LNG tanks is exploited in a combined plant, where heat and power are produced by a regenerated gas turbine cycle; at the same time, cold exergy from LNG regasification contributes to an increase in the efficiency of a vapor compression refrigeration cycle. In the paper, the integrated energy system is simulated by means of dynamic modeling under daily variable working conditions. Results confirm that the model is stable and able to determine the time behavior of the integrated plant. Energy saving is evaluated, and daily trends of key thermophysical parameters are reported and discussed. The analysis of thermal recovering from the flue gases shows that it is possible to recover a large energy share from the turbine exhausts. Hence, the system can generate electricity for port cold ironing and, through a secondary brine loop, cold exergy for a refrigeration plant. Overall, the proposed solution allows primary energy savings up to 22% when compared with equivalent standard technologies with the same final user needs. The exploitation of an LNG regasification process through smart integration of energy systems and implementation of efficient energy grids can contribute to greener energy management in harbors.

scholarly journals The Challenge of Climate Change—Complete Energy Systems Transformation: No Nuclear, No Net Zero

Nuclear Law ◽  
2022 ◽  
pp. 85-140
Author(s):  
Timothy Stone
Keyword(s):  
National Policy ◽  
Energy Systems ◽  
Energy System ◽  
Primary Energy ◽  
Low Carbon ◽  
Policy Makers ◽  
Call To Action ◽  
Net Zero ◽  
Primary Energy Supply ◽  
Systems Transformation

AbstractTo achieve Net Zero, natural gas, gasoline, diesel, and fuel oils must be replaced with another source. However, most of the current low-carbon energy sources will also need to be replaced as almost none have more than about 25 years remaining of useful life. The pace and scale of the needed change is unprecedented: almost the whole of the world’s primary energy supply must be replaced. The (re)development of the entire energy system is inherently a sovereign risk and it can only be governments who set national energy policy. There is no doubt that markets will continue to play a part in future energy systems, but at the top level, the pace and scale of change to achieve Net Zero is simply far too fast for markets to adapt properly. This chapter is a call to action to the national policy makers and presents this challenge as an opportunity for creating higher-quality jobs and potentially highly attractive and long-dated investment options. The chapter also outlines some risks, including political indecisiveness and policy volatility as potential impediments to making the most of this opportunity and achieving the Net Zero.

scholarly journals Sustainable Energy Autarky and the Evolution of German Bioenergy Villages

2019 ◽  
Vol 11 (18) ◽  
pp. 4996
Author(s):  
Dariusz Pieńkowski ◽  
Wojciech Zbaraszewski
Keyword(s):  
Sustainable Development ◽  
Renewable Resources ◽  
Sustainable Energy ◽  
Energy Systems ◽  
Energy System ◽  
Global Perspective ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Closed Economies ◽  
Sustainable Energy System

The concept of an autarky has a long history and meaning related to its negation and unpopularity. In liberal schools of economics, autarky is usually considered from the perspectives of economic trade protectionism, closed economies, and threats to welfare. Nevertheless, the concept of autarky has gained a new meaning, understood as the local utilization of renewable energy resources from the perspective of their inter- and intragenerational distribution. Local action is shaped by the global perspective. This research consists of three steps. First, a model of energy autarky has been offered based on the system theory. The model shows the variety of the structures and features of energy systems offered in today’s debates on energy autarky. Second, the key postulates of sustainable development have been presented to define an autarkical sustainable energy system. Finally, the concept of bioenergy villages in Germany has been presented to illustrate the approach to energy autarky. The research shows that the concept of autarky and single solutions, such as the use of renewable resources, are not themselves a success from the perspective of sustainable development; this misunderstanding is well illustrated by the evolution of the German concept of bioenergy villages into smart villages.

Design and analysis of grid-connected sustainable urban residential energy systems

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Deepak Kumar ◽  
Tavishi Tewary
Keyword(s):  
Sensitivity Analysis ◽  
Sustainable Energy ◽  
Energy Systems ◽  
Energy System ◽  
Energy Resources ◽  
Analysis Approach ◽  
Residential Energy ◽  
Load Profile ◽  
Content Type ◽  
Proposed Model

Purpose Earlier most of the research groups have designed and developed hybrid renewable energy system models with technological, scientific and industrial advancement for the energy systems, but slight attention has been paid towards the grid-connected sustainable urban residential energy systems (SUReS) for metropolitan cities. The current research wishes to design, model and analyze grid-connected energy system for residential applications for sustainable urban residential energy system. The works aims to explore the potential of the augmented energy system for grid-connected energy system. Design/methodology/approach The proposed grid-connected SUReS are validated for a sample location at New Delhi (India) with a hybrid optimization model for electric renewable (HOMER) software to define and understand the various load profile. It presents the sensitivity analysis approach to validate the design of the proposed energy system. Findings The obtained results reports the key barriers, proposed model and scenarios for sustainable urban energy system development. Research limitations/implications Similar approaches can be replicated to design and develop an independent, self-sustainable cleaner and environmental-friendly energy system in the future scenario for the extension of complex grid infrastructures. Practical implications It will assist the stakeholder in solving the complex urban sustainability issues raised due to the shortage of energy. Social implications It will offer a clean and environment friendly sustainable energy resources with reduced carbon emissions. It will benefit sustainable energy resources with a mix of challenges and opportunities, to suggest an approach for implementation of efficient energy policies to optimize the existing and forthcoming energy systems. Originality/value The current research offers a design and model to analyze grid-connected energy system sustainable urban residential applications. It explores the potential of the augmented energy system. The proposed model are validated for a sample location with HOMER simulation software to define and understand various scenarios of the multiple load profile. The work presents the sensitivity analysis approach to validate the proposed energy system.

scholarly journals What Will Make Energy Systems Sustainable?

2018 ◽  
Vol 10 (7) ◽  
pp. 2537 ◽  
Author(s):  
Angela Köppl ◽  
Stefan Schleicher
Keyword(s):  
Value Chain ◽  
Electric Energy ◽  
Energy Systems ◽  
Spillover Effects ◽  
Energy System ◽  
Radical Change ◽  
Primary Energy ◽  
Lessons Learned ◽  
Sustainable Energy Systems ◽  
Development Goals

Despite the success of the German Energiewende in increasing the production of electricity from renewables and the positive global spillover effects of renewable technologies, one of the lessons learned is the insight that simply shifting to renewables and recommending improving energy efficiency is not sufficient to lower greenhouse gas emissions. Combined with the expected radical change of technologies, this requires a more profound understanding of our energy systems. Therefore, in contrast to many conventional energy economy approaches, we propose a deepened structural analysis that covers the full energy value chain from the required functionalities for mechanical, thermal and specific electric energy services via application and transformation technologies up to primary energy. This deepened structural approach opens and substantially enhances our understanding of policy designs that are compatible with the Paris Agreement and Sustainable Development Goals. We discover the essential role of four energy grids, namely for electricity, heat, gas, and information as the key for integrating all components of a newly structured energy system. Consequently, we conclude that policy strategies focusing on individual components of an energy system like shifting to renewables may, from a comprehensive perspective on more sustainable energy systems, prove even counterproductive.

scholarly journals Validating Simulation Result of Solar Hybrid System for Domestic Consumers using HOMER Software

2019 ◽  
Vol 8 (11) ◽  
pp. 1428-1431
Keyword(s):  
Fossil Fuel ◽  
Energy Systems ◽  
Energy System ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Hybrid Energy ◽  
Renewable Power ◽  
Viable Solution ◽  
Simulation Based ◽  
Optimum Utilization

Consumption of fossil fuel and its effect on the environment has become a major universal problem. It is therefore necessary to use renewable energy resources (RES) such as solar, wind, etc. to decrease dependency on conventional energy resources. Currently, solar rooftop PV hybrid energy systems are becoming popular to overcome with the disadvantages of conventional energy sources. This paper presents a simulation-based strategy with the help of HOMER software to control the optimum utilization of renewable hybrid energy system for private buildings where it helps to maximize the building’s renewable power ratio and minimizing complete net current costs and CO2 emissions so that it’s a viable solution to address to the power shortage and Greenhouse gas emissions. Finally, manual calculations measured with net-meter are being validated with HOMER software and the results are more accurate with a variation of 1%

scholarly journals An overview of integrated power supply system: Solution to Nigeria’s electricity problem

2013 ◽  
Vol 5 (1) ◽  
pp. 268-273
Author(s):  
A. A. Senbanjo ◽  
J.O. Coker
Keyword(s):  
Power Generation ◽  
Power Supply ◽  
Distribution Systems ◽  
Distribution Networks ◽  
Primary Energy ◽  
Supply System ◽  
Generation System ◽  
Electric Power Supply ◽  
System Solution ◽  
Transmission And Distribution

This work traces the causes of electricity problem in Nigeria to inadequate power generation. Though other militating factors such as faulty transmission and distribution systems were highlighted, the study insists that the major contributing factor to the epileptic electric power supply in the country is due to the inadequate power generation system currently in place. The study further proposes an integrated powers supply system whereby several sources of primary energy are harnessed and combined to give a robust generation system, as the solutionto the epileptic power supply in the country. The study further recommends that the reactivation and repairs of the country’s power transmission and distribution networks, is germane to the attainment of this goal.

scholarly journals Sustainability and Energy Conversions

MRS Bulletin ◽  
2008 ◽  
Vol 33 (4) ◽  
pp. 297-302 ◽  
Author(s):  
Sally M. Benson ◽  
Franklin M. Orr
Keyword(s):  
Energy Systems ◽  
Energy System ◽  
Global Scale ◽  
Energy Resources ◽  
Energy Sources ◽  
Greenhouse Emissions ◽  
Material Sciences ◽  
The Cost ◽  
Huge Challenge

AbstractA sustainable global energy system requires a transition away from energy sources with high greenhouse emissions. Vast energy resources are available to meet our needs, and technology pathways for making this transition exist. Lowering the cost and increasing the reliability and quality of energy from sustainable energy sources will facilitate this transition. Changing the world's energy systems is a huge challenge, but it is one that can be undertaken now with improvements in energy efficiency and with continuing deployment of a variety of technologies. Numerous opportunities exist for research in material sciences to contribute to this global-scale challenge.

scholarly journals Analysis of the scale of the implementation of the energy security threats in Russia up to 2030 and the main directions for the neutralization of these threats

2018 ◽  
Vol 69 ◽  
pp. 02011 ◽  
Author(s):  
Viktor Rabchuk ◽  
Sergey Senderov
Keyword(s):  
Energy Security ◽  
Energy Systems ◽  
Primary Energy ◽  
Energy Resources ◽  
Security Threats ◽  
Factors Affecting ◽  
Energy Complex ◽  
The Future ◽  
Main Factors

In the paper the scales of implementation of strategic threats to energy security are compared for different time stages. The main factors affecting the strengthening or weakening of these threats are shown. The estimation of the country’s total needs in primary energy resources and the required volumes of gas to fully cover these needs (taking into account the capabilities of other energy systems of the fuel and energy complex) is made. The total possible levels of Russian gas exports for the future are estimated. The possibilities of fuel and energy complex industries for the perspective satisfaction of the needs of domestic and export consumers are considered in detail.

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