scholarly journals Robust Optimization Model for Energy Purchase and Sale of Electric–Gas Interconnection System in Multi-Energy Market

2019 ◽  
Vol 9 (24) ◽  
pp. 5497
Author(s):  
Jiacheng Yang ◽  
Zhongfu Tan ◽  
Di Pu ◽  
Lei Pu ◽  
Caixia Tan ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Natural Gas ◽  
Robust Optimization ◽  
Output Power ◽  
Optimization Model ◽  
Energy Utilization ◽  
Conversion Function ◽  
Energy Market ◽  
Energy Unit ◽  
System A

With the increasing coupling of the power system and the natural gas system, the electric–gas interconnection system has become a typical form of comprehensive energy utilization. Through the energy conversion function of the coupling unit, the system can flexibly participate in the bidding for purchasing and selling energy in a power market and a natural gas market on the premise of meeting the internal demand of multiple loads. To solve the internal coordination and optimization problem and the external flexible bidding problem in the multi-energy market, this paper proposes a robust optimization model of energy purchase and sale for the electric–gas interconnection system in a multi-energy market. Firstly, the basic structure of the electric–gas interconnection system is introduced, and the steady-state model of energy flow in the system is built based on the energy hub model. Secondly, considering the uncertainty of energy prices and the output power of renewable energy units in the system, a bidding model for energy purchase and sale of the electric–gas interconnection system in multi-energy market based on the idea of robust optimization is constructed in the framework of the Nordic energy market. Finally, empirical analysis based on the actual data is carried out, and the results prove the validity and superiority of the model. In this paper, aiming at the uncertainty of energy price, a large number of scenes are generated by Latin hypercube sampling (LHS), and then a k-means algorithm is used to reduce the scenes, so as to simulate typical scenes. Aiming at the uncertainty of the output power of the renewable energy unit in the system, a cardinal uncertainty set is used to control deviation between the actual output power and predicted output power, so that the overall robustness of the model can be controlled. The proposed model can make decision-making independent of the accurate probability distribution of uncertainty factors, and is suitable for complex multi energy systems. Meanwhile, the model possesses excellent robustness, which can effectively reduce the risk of bidding loss in the process of energy purchase and sale.

scholarly journals Multidispatch for Microgrid including Renewable Energy and Electric Vehicles with Robust Optimization Algorithm

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2813 ◽  
Author(s):  
Ruifeng Shi ◽  
Penghui Zhang ◽  
Jie Zhang ◽  
Li Niu ◽  
Xiaoting Han
Keyword(s):  
Renewable Energy ◽  
Robust Optimization ◽  
Electric Vehicles ◽  
Optimization Algorithm ◽  
Environmental Cost ◽  
Uncertain Variables ◽  
System A ◽  
Ev Charging ◽  
Numerical Case Study

With the deterioration of the environment and the depletion of fossil fuel energy, renewable energy has attracted worldwide attention because of its continuous availability from nature. Despite this continuous availability, the uncertainty of intermittent power is a problem for grid dispatching. This paper reports on a study of the scheduling and optimization of microgrid systems for photovoltaic (PV) power and electric vehicles (EVs). We propose a mathematical model to address the uncertainty of PV output and EV charging behavior, and model scheduling optimization that minimizes the economic and environmental cost of a microgrid system. A semi-infinite dual optimization model is then used to deal with the uncertain variables, which can be solved with a robust optimization algorithm. A numerical case study shows that the security and stability of the solution obtained by robust optimization outperformed that of stochastic optimization.

scholarly journals Construction and Analysis of LNG Cold Energy Utilization System

2020 ◽  
Vol 6 (5) ◽  
pp. 267-275
Author(s):  
L. Yan ◽  
Y. Zhou
Keyword(s):  
Power Generation ◽  
Heat Exchange ◽  
Natural Gas ◽  
Output Power ◽  
Economic Benefit ◽  
Rankine Cycle ◽  
Liquefied Natural Gas ◽  
Energy Utilization ◽  
Working Medium ◽  
Cold Energy

The theme of this research is the intermediate fluid vaporizer (IFV) gasification system for an offshore liquefied natural gas floating storage regasification unit (LNG-FSRU). Based on reducing the loss of heat exchange and improve the cold energy utilization, an LNG cold energy utilization system combined with Rankine cycle power generation and desalination is proposed. On this basis, six different schemes of working medium combination are simulated and analyzed, and the optimal scheme of working medium combination is found. The results show that the net output power of the system is 5591 kw, and the system exergy efficiency is 30.38%. The annual economic benefit is CNY 39.4 million.

scholarly journals Simulation and optimization of liquefied natural gas cold energy power generation system on floating storage and regasification unit

2020 ◽  
pp. 205-205
Author(s):  
Likang Xu ◽  
Guihua Lin
Keyword(s):  
Natural Gas ◽  
Output Power ◽  
Rankine Cycle ◽  
Exergy Efficiency ◽  
Liquefied Natural Gas ◽  
Energy Utilization ◽  
Utilization Rate ◽  
Simulation And Optimization ◽  
Cycle System ◽  
Cold Energy

In this paper, based on the idea of reducing heat exchanger exergy destruction and increasing turbine work, a new three-stage cascade Rankine system and a new four-stage cascade Rankine system is proposed to improve the cold energy utilization rate during liquefied natural gas(LNG) gasification on liquefied natural gas-floating storage and regasification unit. Then compare them with the original cascade Rankine cycle established under the same conditions. The results show that under the condition of 175 t/h LNG flow, the maximum net output power of the new three-stage cascade Rankine cycle system is 4593.31 kW, the exergy efficiency is 20.644%. The maximum net output power of the new four-stage cascade Rankine cycle system is 5013.93 kW, and the exergy efficiency is 22.509%. Compared with the original cascade Rankine cycle system, the maximum net output power of the new three-stage cascade Rankine cycle system and the new four-stage cascade Rankine cycle system is increased by 9.41% and 11.45%, respectively, and the system exergy efficiency is increased by 9.29% and 11.28%, respectively.

scholarly journals Effect of Renewable Energy to Reduce Carbon Emissions under a Flexible Production System: A Step Toward Sustainability

Energies ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 215
Author(s):  
Mitali Sarkar ◽  
Byung Do Chung
Keyword(s):  
Renewable Energy ◽  
Production System ◽  
Carbon Emission ◽  
Graphical Representation ◽  
Technological Development ◽  
Environmental Issues ◽  
Major Effect ◽  
Energy Utilization ◽  
Flexible Production ◽  
System A

Renewable energy and environmental issues are receiving considerable attention worldwide along with the technological development of production system for reducing global warming. Due to the use of smart technologies, the rate of carbon emission and energy utilization have become very high and are directly related to different industries. This study focuses on the effect of renewable energy on the advancement of smart production with a flexible production rate as well as the reduction of carbon emission to build a sustainable smart production system. A mathematical model is developed to maximize the profit of the smart production system for economic development while considering technological and environmental issues. The model is solved analytically, and we obtain closed and quasi-closed form solutions. A numerical experiment is performed, and a comparison with previous studies indicates that our method achieves more profit than existing ones. Additionally, we highlight the major effect of renewable energy. Different graphical representations of the decision variables prove the convergence of the model. A sensitivity analysis and graphical representation are presented in this paper, and some recommendations for industry are provided by simulating this model in different scenarios.

Geopolitics of Energy

2016 ◽  
Vol 3 (1) ◽  
pp. 78
Author(s):  
Blerina Muskaj
Keyword(s):  
Natural Gas ◽  
Qualitative Methodology ◽  
Scientific Literature ◽  
Point Of View ◽  
Energy Market ◽  
Energy Potential ◽  
Environmental Consequences ◽  
Regional Energy ◽  
Political Debates ◽  
Political Weapon

At the beginning of my paper I will explain the concept of "Geopolitics of Energy", this will be done for a quite simple reason, because I want everyone who can sit to read this article to understand more clearly what is at stake, therefore allow them the comprehension of what is being elaborated bellow at first sight. Geopolitics of energy is a concept that relates to policies choosing exporters to implement on importers, is the policy that has an impact on energy consumption, which includes consumer’s choice in the geopolitical context, taking into account the economy, foreign policy, the safety of energy, environmental consequences and priorities that carries the energy exporter. This concept permits the understanding of how works the politics that undertakes this initiative taking into account natural resources such as: natural gas and oil. Natural gas and oil are two main resources that produce energy but also two main elements on which arises all the topic in the energetics game. For this paper is used qualitative methodology, through which we were able to accomplish this work. I focused on scientific literature, official publications and reports on energy geopolitics. The main aim has been to show how in this decade, energy security is at the center of geopolitical agenda and has become the focus of numerous political debates. Regarding this point of view, Europe is taking the initiative to create a common energy market within the continent by creating projects, in which Albania appears as a new regional energy potential. Russia, which is aiming to play a role in the international arena, is seeking to position itself geopolitically in "its political weapon", hydrocarbon resources, in particular natural gas resources.

Sign in / Sign up

Export Citation Format

Share Document