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Linear diophantine uncertain linguistic-based prospect theory approach for performance evaluation of islanded microgrid-system scenarios

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Clean energy 2023年第2期7卷 263-282页

作者： Sweta Singh Neeraj Kanwar Divya Zindani Department of Electrical Engineering Manipal University JaipurIndia Department of Mechanical Engineering Sri Sivasubramaniya Nadar College of EngineeringKalavakkamTamil NaduIndia

Renewable-energy-based hybrid microgrids can aid in achieving one of the United Nations Sustainable Development Goals,i.e.‘Affordable and clean energy’.However,experts may be faced with the challenge of selecting the best one for the electrification of an area.To avoid the challenge and realize the ultimate goal of the United Nations,the present study,therefore,proposes a novel pros-pect theory-based decision-making approach to help experts in opting for the best microgrid scenario.The proposed decision-making framework considers the risk appetite of the decision-maker,a quintessential aspect of the process.Linear diophantine uncertain lin-guistic sets are used to model the linguistic evaluations from the experts.The information from different experts is aggregated using a linear diophantine uncertain linguistic power Einstein-weighted geometric operator.Finally,the prospect-theory-based TOmada de Decisao Interativa Multicriterio approach is employed to evaluate the performance of the available microgrid scenarios and hence opt for the best microgrid scenario.The proposed framework has been used to evaluate the performance of seven possible microgrid scenarios and hence select the best one that can be implemented for rural electrification of a remote village in Assam,India.The microgrid scenario consisting of a photovoltaic-wind turbine-fuel cell-battery converter(MG_(3))has been revealed to be the best scen-ario among the seven considered microgrid scenarios.The validity of the obtained ranking results has been adjudged through a com-prehensive evaluation regarding the attenuation factor and the weights of the criteria.Moreover,previous case studies have also been solved using the proposed methodology and the results reveal a good correlation between the obtained ranking results.

关键词： distributed energy and smart grid energy and environment islanded microgrid

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A review on non-isolated low-power DC-DC converter topologies with high output gain for solar photovoltaic system applications

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Clean energy 2022年第4期6卷 557-572页

作者： Tole Sutikno Hendril Satrian Purnama Nuryono Satya Widodo Sanjeevikumar Padmanaban Mohd Rodhi Sahid Department of Electrical Engineering Industrial Technology FacultyUniversitas Ahmad Dahlan55191 YogyakartaIndonesia Embedded System and Power Electronics Research Group 55191 YogyakartaIndonesia CTiF Global Capsule Department of Business Development and TechnologyAarhus UniversityHerning 7400Denmark School of Electrical Engineering Faculty of EngineeringUniversiti Teknologi MalaysiaJohorMalaysia

The major challenges of the high-gain DC-DC boost converters are high-voltage stress on the switch,extreme duty ratio operation,diode reverse-recovery and converter efficiency problems.There are many topologies of high-gain converters that have been widely developed to overcome those problems,especially for solar photovoltaic(PV)power-system applications.In this paper,20 high-gain and low-power DC-DC converter topologies are selected from many topologies of available literature.Then,seven prospective topologies with conversion ratios of>15 are thoroughly reviewed and compared.The selected topologies are:(i)voltage-multiplier cell,(ii)voltage doubler,(iii)coupled inductor,(iv)converter with a coupled inductor and switch capacitor,(v)converter with a switched inductor and switched capacitor,(vi)cascading techniques and(vii)voltage-lift techniques.Each topology has its advantages and disadvantages.A comparison of the seven topologies is provided in terms of the number of components,hardware complexity,maximum converter efficiency and voltage stress on the switch.These are presented in detail.So,in the future,it will be easier for researchers and policymakers to choose the right converter topologies and build them into solar PV systems based on their needs.

关键词： distributed energy and smart grid energy and environment energy system and policy solar

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Optimal integration of battery energy-storage system with high penetration of renewable energy in radial distribution network

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Clean energy 2022年第3期6卷 404-411页

作者： Hafsa Imra Sheikh Mahesh Kumar Rathi Amir Mahmood Soomro Department of Electrical Engineering Mehran University of Engineering and TechnologyJamshoroPakistan

Considering the intermittent nature of renewable energy,a storage system to reserve power in off-peak hours and then to supply it during peak hours is necessary.However,if these storage devices in a network are not placed in an appropriate manner,the advantages can never be achieved.In this study,the allocation and sizing strategies of a battery energy-storage system(BESS)in an optimal way are proposed to improve the performance of the radial distribution networks.The test network adopted is a standard IEEE 33 bus network that is integrated with solar power.Simulations are carried out in DIgSILENT PowerFactory for the distribution network model and the process of optimization is done through MATLAB®.The optimization algorithm adopted is the genetic algorithm.The system is studied for 24 hours with a step size of 15 minutes,employing a time-sweep analysis of dynamic load.It is studied under three different scenarios and the results are compared.The results illustrate a considerable reduction in power losses in the case of the optimized BESS.The total losses before the optimization process are 16365.57 kW.The total losses after the employment of the proposed solution are 10246.5 kW,which means that the losses are reduced by≤62%.

关键词： energy and environment energy storage solar

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Hydrogen technologies and developments in Japan

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Clean energy 2019年第2期3卷 105-113页

作者： Shigeki Iida Ko Sakata Director The Institute of Applied Energy Executive Research Fellow The Institute of Applied Energy

The successful development of hydrogen-energy technologies has several advantages and benefits.Hydrogen-energy development could prevent global warming as well as ensure energy security for countries without adequate energy resources.The successful development of hydrogen would provide energy for transportation and electric power.It is a unique energy carrier,as it can be produced from various energy sources such as wind,fossil fuels and biomass and,when it is combusted,it emits no CO_(2)emissions.The other advantage is the wide distribution of resources globally that can be used to produce hydrogen.In Japan,the Ministry of Economy,Trade and Industry(METI)published a‘Strategic Roadmap for Hydrogen and Fuel Cells’in 2014,with a revised update published in March 2016.The goal of the roadmap is to achieve a hydrogen society.The roadmap aims to resolve technical problems and secure economic efficiency.The roadmap has been organized into the following three phases:Phase 1-Installation of fuel cells;Phase 2-Hydrogen power plant/mass supply chain;Phase 3-CO_(2)-free hydrogen.This paper reports on the current status of fuel cells and fuel-cell vehicles in Japan and gives a description and status of the R&D programmes along with the results of global energy model study towards 2050.

关键词： hydrogen and fuel cell energy system and policy energy and environment energy storage

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Integrating the ISO 14034 standard as a platform for carbon capture and utilization technology performance evaluation

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Clean energy 2021年第4期5卷 600-610页

作者： Tim Hansen Kevin McCabe Bill Chatterton Michael Leitch 350Solutions Inc.1053 E.Whitaker Mill RdSuite 115RaleighNC 27604USA XPRIZE Foundation 800 Corporate PointeSuite 350Culver CityCA 90230USA

Independent testing and verification of emerging technologies are vital parts of the technology-commercialization process.With the rapid development of carbon capture and utilization(CCU)technologies,where existing standards and certifications do not exist,independent verification approaches and guidelines can provide a means to obtain credible information for an emerging market.The ISO 14034:2016-environmental Management:environmental Technology Verification(ETV)standard can serve as a foundational platform to ensure the consistency,quality and credibility of data on CCU technology performance,enabling direct comparisons between technologies and reducing risk to decision-makers regarding potential investment,future deployment and ultimate impacts of CCU innovations.Applying the fundamental principles of ISO 14034 to the evaluation of nine finalist CCU technologies competing in the NRG COSIA Carbon XPRIZE ensured that data used to evaluate competitors was of high quality,consistent across technologies and met the information needs of the XPRIZE and competition judges responsible for selecting winners.The approaches outlined here,including verification parameters and verification tasks for both XPRIZE-specific technology evaluations and full CCU technology evaluation by an accredited entity in conformance with the ISO 14034 standard,provide insight into the potential benefits-methodological consistency,high-quality data,independent oversight,methodological flexibility and broad applicability-and limitations-technology readiness and applicability,verification and instrumentation costs and lack of specificity-of the approach in an application for the evaluation of emerging technologies.Further application of the ISO 14034 standard and principles,developed through a consensus approach that incorporates other developing guidelines,can drive consistency and credibility for technology-performance evaluations across the CCU sector,ultimately leading to reduced risk and improved market access for new innovations.

关键词： carbon capture CCUS chemical engineering coal energy and environment fossil energy

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The micro-meso-macro architecture of a proposed collaborative emergent strategy for the hydrogen market

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Clean energy 2021年第4期5卷 634-643页

作者： John Tranfield The University of Western Australia 35 Stirling HwyCrawley WA 6009Australia

In 2018,an intergovernmental climate-change panel concluded that,to maintain a global temperature increases of110 countries have pledged net-zero carbon ambitions by 2050 and hydrogen has been identified at national levels as key to achieving this.Governments have pledged>US$70 billion to further advance hydrogen infrastructure and technology,with an additional investigation on>200 proposed hydrogen-based projects expecting completion before 2030,totalling a value of US$300 billion.Reaching these aggressive targets will require a disciplined cohesion of collaborative strategies to develop an integrated macro infrastructure system.This article discusses the current infancy of the hydrogen market,introduces and defines a new‘collaborative emergent strategy’based on the emergent strategy concept by Mintzberg and Waters,and links its developmental viability through a staged micro-meso-macro architecture.Successful strategic business case studies and current market opportunities across multiple industries are reviewed as they all vie for a strategic early market position.

关键词： hydrogen and fuel cell hydrogen business business strategy emergent strategy Porter collaborative emergent strategy energy and environment

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A comparative life-cycle analysis of tall onshore steel wind-turbine towers

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Clean energy 2020年第1期4卷 48-57页

作者： N.Stavridou E.Koltsakis C.C.Baniotopoulos Civil Engineering Department School of EngineeringUniversity of BirminghamEdgbastonBirminghamUK Civil Engineering Department School of EngineeringAristotle University of ThessalonikiGreece

Earth has lately been suffering from unforeseen catastrophic phenomena related to the consequences of the greenhouse effect.It is therefore essential not only that sustainability criteria be incorporated into the everyday lifestyle,but also that energy-saving procedures be enhanced.According to the number of wind farms installed annually,wind energy is among the most promising sustainable-energy sources.Taking into account the last statement for energy-saving methods,it is essential to value the contribution of wind energy not only in eliminating CO_(2) emissions when producing electricity from wind,but also in assessing the total environmental impact associated with the entire lifetime of all the processes related with this energy-production chain.In order to quantify such environmental impacts,life-cycle analysis(LCA)is performed.As a matter of fact,there are a very limited number of studies devoted to LCA of onshore wind-energy-converter supporting towers-a fact that constitutes a first-class opportunity to perform high-end research.In the present work,the life-cycle performance of two types of tall onshore wind-turbine towers has been investigated:a lattice tower and a tubular one.For comparison reasons,both tower configurations have been designed to sustain the same loads,although they have been manufactured by different production methods,different amounts of material were used and different mounting procedures have been applied;all the aforementioned items diversify in their overall life-cycle performance as well as their performance in all LCA phases examined separately.The life-cycle performance of the two different wind-turbine-tower systems is calculated with the use of efficient open LCA software and valuable conclusions have been drawn when combining structural and LCA results in terms of comparing alternative configurations of the supporting systems for wind-energy converters.

关键词： energy and environment energy system and policy wind energy

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Carbon capture and storage in the USA:the role of US innovation leadership in climate-technology commercialization

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Clean energy 2020年第1期4卷 2-11页

作者： Lee Beck Global CCS Institute Ltd Level 16360 Elizabeth Street Melbourne VIC 3000 Australia

To limit global warming and mitigate climate change,the global economy needs to decarbonize and reduce emissions to net-zero by mid-century.The asymmetries of the global energy system necessitate the deployment of a suite of decarbonization technologies and an all-of-the-above approach to deliver the steep CO_(2)-emissions reductions necessary.Carbon capture and storage(CCS)technologies that capture CO_(2) from industrial and power-plant point sources as well as the ambient air and store them underground are largely seen as needed to address both the flow of emissions being released and the stock of CO_(2) already in the atmosphere.Despite the pressing need to commercialize the technologies,their large-scale deployment has been slow.Initial deployment,however,could lead to near-term cost reduction and technology proliferation,and lowering of the overall system cost of decarbonization.As of November 2019,more than half of global large-scale CCS facilities are in the USA,thanks to a history of sustained government support for the technologies.Recently,the USA has seen a raft of new developments on the policy and project side signaling a reinvigorated push to commercialize the technology.Analysing these recent developments using a policy-priorities framework for CCS commercialization developed by the Global CCS Institute,the paper assesses the USA’s position to lead large-scale deployment of CCS technologies to commercialization.It concludes that the USA is in a prime position due to the political economic characteristics of its energy economy,resource wealth and innovation-driven manufacturing sector.

关键词： carbon capture CCUS energy and environment energy system and policy fossil energy hydrogen and fuel cell

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