Modeling and Operational Optimization Based on Energy Hubs for Complex Energy Networks With Distributed Energy Resources

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
Shixi Ma ◽  
Dengji Zhou ◽  
Huisheng Zhang ◽  
Shilie Weng ◽  
Tiemin Shao
Keyword(s):  
Large Scale ◽  
Optimization Method ◽  
Integrated System ◽  
Energy Resources ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Small Scale ◽  
Distributed Energy ◽  
Operational Optimization

Energy hubs is an integrated system which is capable of transporting, transforming, and storing several types of energy. A number of hubs can be combined as a network and achieve higher efficiency by exchanging information and energy with each other. A decision-making framework for optimal integration of independent small-scale distributed energy systems and traditional large scale combined heating and power (CHP) plants is presented, and an energy supply system with renewable energy resources in Shanghai is cited as a case study. A performance simulation model of this energy network is proposed based on energy hub concept and energy flow between its elements. Furthermore, a novel optimization method named Whales optimization algorithm (WOA) is presented for 24 h operational optimization. A case study is undertaken on a seven-node energy system, including four energy hubs and three load hubs. The results of the case study show that the proposed model and optimization method can improve energy utilization efficiency and reduce system operating costs, even under a system contingency condition.

Modeling and Optimal Operation of a Network of Energy Hubs System With Distributed Energy Resources

2017 ◽  
Author(s):  
Shixi Ma ◽  
Dengji Zhou ◽  
Huisheng Zhang ◽  
Zhenhua Lu
Keyword(s):  
Power Plants ◽  
High Efficiency ◽  
Combustion Engine ◽  
Optimal Operation ◽  
Energy Resources ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Small Scale ◽  
Distributed Energy

Energy hubs is a functional unit which is capable of transporting transforming and storing of several kinds of energy. Several hubs can be combined as a network and achieve higher efficiency by exchanging energy with each other. A framework to assist the decision-making process towards the optimal integration of independent small scale distributed energy systems and traditional large scale CHP power plants is presented using an energy supply system in Shanghai as a case study. A model of this complex network of energy hubs with renewable energy resources is presented based on energy flow between its constituent elements. Furthermore, GA optimization method is presented for short term 24-hour optimal operation. Case study are undertaken on a 7-node energy system which comprises 4 energy hubs and 3 load hubs. Results validate the high efficiency of this system. Two cases with and without internal-combustion engine failure within the network are considered. The results showed that the proposed system can enhance the energy utilization efficiency and reduce the system operation cost, even under a system contingency.

scholarly journals Steam-Water Modelling and the Coal-Saving Scheduling Strategy of Combined Heat and Power Systems

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 141
Author(s):  
Junshan Guo ◽  
Wei Zheng ◽  
Zhuang Cong ◽  
Panfeng Shang ◽  
Congyu Wang ◽  
...  
Keyword(s):  
Heat Load ◽  
Large Scale ◽  
Combined Heat And Power ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Adaptive Mutation ◽  
Small Scale ◽  
Coal Consumption ◽  
Scheduling Strategy ◽  
Power Load

China aims to peak carbon emissions by 2030. As a result, small-scale coal-fired combined heat and power (CHP) units and self-provided units are gradually shut down, and large-scale coal-fired CHP units are a solution to undertake the industrial heat loads. From the perspective of the industrial heat load allocation during the non-heating season, the problems regarding the coal-saving scheduling strategy of coal-fired CHP units are addressed. The steam-water equations of CHP units are established to analyze the heat-power coupling characteristics. The energy utilization efficiency, exergy efficiency and the coal consumption are analyzed. The optimization model of saving coal consumption is established and the adaptive mutation particle swarm optimization (AMPSO) is introduced to solve the above model. The 330 MW coal-fired CHP unit is taken as an example, and the results show that for the constant main flow rate, each increase of 1 t/h industrial steam extraction will reduce the power output by about 0.321 MW. The energy utilization efficiency and the exergy are mainly influenced by industrial steam supply and the power load, respectively. For the CHP system with two parallel CHP units, the unequal allocation of industrial heat load between two units saves more coal than equal allocation. The coal consumption can be reduced when the unit with lower power load undertakes more industrial heat load. In the typical day, the total coal consumption after optimization is 3203.92 tons, a decrease of 14.66 tons compared to the optimization before. The two CHP units in the case can benefit about 5,612,700 CHY extra in one year.

scholarly journals IOT based modeling of closed transition transfer switch in IEC 61850

2018 ◽  
Vol 7 (2.12) ◽  
pp. 329
Author(s):  
Hyun Sung Lim ◽  
In Ho Ryu ◽  
Jun Ho Bang
Keyword(s):  
Electric Energy ◽  
Energy Resource ◽  
Energy System ◽  
Integrated System ◽  
Energy Resources ◽  
Distributed Energy Resources ◽  
Small Scale ◽  
Grid System ◽  
Distributed Energy ◽  
Iec 61850

Background/Objectives: The power demand of utility electrical power has stimulated the use of distributed energy for peak shaving. Distributed energy resources need to be monitored and controlled like Internet of Things.Methods/Statistical analysis: Distributed Energy Resources (DERs) are small scale electric energy system like Micro Turbine, Photovoltaic, Wind power, Small Generator and widely spread in Korea. For utilizing electrical device with Internet of Things, we need integrated system and adapt International Electrical Code like IEC 61850.Findings: To connect DERs with uninterrupted grid system, it required Closed Transition Transfer Switch (CTTS). Existing International Electrical Code presented some distributed energy resource by IEC 61850-7-420. However, the switch like CTTS is not presented. So, we described modeling of CTTS in IEC 61850 and verified monitoring data with TCP/IP.Improvements/Applications: The proposed modeling of CTTS not only combines the DERs with grid system but also conjugates smart grid system with IOT Technology. 

Main features of an aggregator’s platform for the management of distributed energy resources – PASCAL project case study

2020 ◽  
Author(s):  
Giuseppe Marco Tina ◽  
Salvatore Cavalieri ◽  
Gian Giuseppe Soma ◽  
Gianni Viano ◽  
Sebastiano De Fiore ◽  
...  
Keyword(s):  
Energy Resources ◽  
Distributed Energy Resources ◽  
Distributed Energy

scholarly journals A Real-Time Monitoring Platform for Distributed Energy Resources in a Microgrid—Pilot Study in Oman

Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1803
Author(s):  
Nasser Hosseinzadeh ◽  
Ahmed Al Maashri ◽  
Naser Tarhuni ◽  
Abdelsalam Elhaffar ◽  
Amer Al-Hinai
Keyword(s):  
Real Time ◽  
Communication Channel ◽  
Energy Resources ◽  
Distributed Energy Resources ◽  
Small Scale ◽  
Area Network ◽  
Distributed Energy ◽  
Real Time Monitoring ◽  
Holistic View ◽  
Monitoring Platform

This article presents the development of a platform for real-time monitoring of multi-microgrids. A small-scale platform has been developed and implemented as a prototype, which takes data from various types of devices located at a distance from each other. The monitoring platform is interoperable, as it allows several protocols to coexist. While the developed prototype is tested on small-scale distributed energy resources (DERs), it is done in a way to extend the concept for monitoring several microgrids in real scales. Monitoring strategies were developed for DERs by making a customized two-way communication channel between the microgrids and the monitoring center using a long-range bridged wireless local area network (WLAN). In addition, an informative and easy-to-use software dashboard was developed. The dashboard shows real-time information and measurements from the DERs—providing the user with a holistic view of the status of the DERs. The proposed system is scalable, modular, facilitates the interoperability of various types of inverters, and communicates data over a secure communication channel. All these features along with its relatively low cost make the developed real-time monitoring platform very useful for online monitoring of smart microgrids.

scholarly journals Supply chain resilience in a developing country context: a case study on the interconnectedness of threats, strategies and outcomes

2017 ◽  
Vol 22 (6) ◽  
pp. 486-505 ◽  
Author(s):  
Benjamin Tukamuhabwa ◽  
Mark Stevenson ◽  
Jerry Busby
Keyword(s):  
Supply Chain ◽  
Developing Country ◽  
Large Scale ◽  
Empirical Studies ◽  
Small Scale ◽  
Supply Network ◽  
Catastrophic Events ◽  
Content Type ◽  
Supply Chain Resilience

Purpose In few prior empirical studies on supply chain resilience (SCRES), the focus has been on the developed world. Yet, organisations in developing countries constitute a significant part of global supply chains and have also experienced the disastrous effects of supply chain failures. The purpose of this paper is therefore to empirically investigate SCRES in a developing country context and to show that this also provides theoretical insights into the nature of what is meant by resilience. Design/methodology/approach Using a case study approach, a supply network of 20 manufacturing firms in Uganda is analysed based on a total of 45 interviews. Findings The perceived threats to SCRES in this context are mainly small-scale, chronic disruptive events rather than discrete, large-scale catastrophic events typically emphasised in the literature. The data reveal how threats of disruption, resilience strategies and outcomes are inter-related in complex, coupled and non-linear ways. These interrelationships are explained by the political, cultural and territorial embeddedness of the supply network in a developing country. Further, this embeddedness contributes to the phenomenon of supply chain risk migration, whereby an attempt to mitigate one threat produces another threat and/or shifts the threat to another point in the supply network. Practical implications Managers should be aware, for example, of potential risk migration from one threat to another when crafting strategies to build SCRES. Equally, the potential for risk migration across the supply network means managers should look at the supply chain holistically because actors along the chain are so interconnected. Originality/value The paper goes beyond the extant literature by highlighting how SCRES is not only about responding to specific, isolated threats but about the continuous management of risk migration. It demonstrates that resilience requires both an understanding of the interconnectedness of threats, strategies and outcomes and an understanding of the embeddedness of the supply network. Finally, this study’s focus on the context of a developing country reveals that resilience should be equally concerned both with smaller in scale, chronic disruptions and with occasional, large-scale catastrophic events.

scholarly journals LANDSCAPE DESIGN FOR SUSTAINABILITY AND ECOSYSTEM SERVICES IN AN URBAN ENVIRONMENT: CASE STUDY OF TEHRAN AND HIS KAN RIVER

2020 ◽  
Author(s):  
Ilda Vagge ◽  
◽  
Gioia Maddalena Gibelli ◽  
Alessio Gosetti Poli ◽  
◽  
...  
Keyword(s):  
Ecosystem Services ◽  
Large Scale ◽  
Management Practices ◽  
Natural Capital ◽  
Landscape Design ◽  
Green Spaces ◽  
Small Scale ◽  
Design For Sustainability ◽  
Holistic Method

The authors, with the awareness that climate change affects and changes the landscape, wanted to investigate how these changes are occurring within the metropolitan area of Tehran. Trying to keep a holistic method that embraces different disciplines, reasoning from large scale to small scale, the authors tried to study the main problems related to water scarcity and loss of green spaces. Subsequently they dedicated themselves to the identification of the present and missing ecosystem services, so that they could be used in the best possible way as tools for subsequent design choices. From the analysis obtained, the authors have created a masterplan with the desire to ensure a specific natural capital, the welfare of ecosystem services, and at the same time suggest good water management practices. It becomes essential to add an ecological accounting to the economic accounting, giving dignity to the natural system and the ecosystem services that derive from it.

Agent-Based Electricity Balancing with Distributed Energy Resources,  A Multiperspective Case Study

2008 ◽  
Author(s):  
Koen Kok ◽  
Zsofia Derzsi ◽  
Jaap Gordijn ◽  
Maarten Hommelberg ◽  
Cor Warmer ◽  
...  
Keyword(s):  
Energy Resources ◽  
Distributed Energy Resources ◽  
Distributed Energy ◽  
Agent Based
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