Cloud storage has the characteristics of distributed and virtual, and it makes the ownership rights and management rights of users data separated. The master-slave architecture of cloud storage has a problem of single...Cloud storage has the characteristics of distributed and virtual, and it makes the ownership rights and management rights of users data separated. The master-slave architecture of cloud storage has a problem of single point failure. In this paper, we provide a cloud storage architecture model based on Semantic equivalence. According to semantic matching degree, this architecture divides the nodes into node cluster by creating semantic tree and maintains system routing through semantic hypergraph. Through simulation experiments show that dividing network into semantic can enhance scalability and flexibility of the system, and it can improve the efficiency of network organization and the security of cloud storage system, at the same time, it can also reduce the cloud data storage and the delay of reading time.展开更多
With the increased promotion of integrated energy power systems(IEPS),renewable energy and energy storage systems(ESS)play a more important role.However,the fluctuation and intermittent nature of wind not only results...With the increased promotion of integrated energy power systems(IEPS),renewable energy and energy storage systems(ESS)play a more important role.However,the fluctuation and intermittent nature of wind not only results in substantial reliability and stability defects,but it also weakens the competitiveness of wind generation in the electric power market.Meanwhile,the way to further enhance the system reliability effectively improving market profits of wind farms is one of the most important aspects of Wind-ESS joint operational design.In this paper,a market-oriented optimized dispatching strategy for a wind farm with a multiple stage hybrid ESS is proposed.The first stage ESS is designed to improve the profits of wind generation through day-ahead market operations,the real-time marketbased second stage ESS is focused on day-ahead forecasting error elimination and wind power fluctuation smoothing,while the backup stage ESS is associated with them to provide the ancillary service.An interval forecasting method is adopted to help to ensure reliable forecast results of day-ahead wind power,electricity prices and loads.With this hybrid ESS design,supply reliability and market profits are simultaneously achieved for wind farms.展开更多
In recent years, the increasing penetration level of renewable generation and combined heat and power(CHP) technology in power systems is leading to significant changes in energy production and consumption patterns. A...In recent years, the increasing penetration level of renewable generation and combined heat and power(CHP) technology in power systems is leading to significant changes in energy production and consumption patterns. As a result, the integrated planning and optimal operation of a multi-carrier energy(MCE) system have aroused widespread concern for reasonable utilization of multiple energy resources and efficient accommodation of renewable energy sources. In this context, an integrated demand response(IDR) scheme is designed to coordinate the operation of power to gas(P2 G) devices, heat pumps,diversified storage devices and flexible loads within an extended modeling framework of energy hubs. Subsequently, the optimal dispatch of interconnected electricity,natural gas and heat systems is implemented considering the interactions among multiple energy carriers by utilizing the bi-level optimization method. Finally, the proposed method is demonstrated with a 4-bus multi-energy systemand a larger test case comprised of a revised IEEE 118-bus power system and a 20-bus Belgian natural gas system.展开更多
Battery energy storage systems(BESSs)serve a crucial role in balancing energy fluctuations and reducing carbon emissions in net-zero power systems.However,the efficiency and cost performance have remained significant ...Battery energy storage systems(BESSs)serve a crucial role in balancing energy fluctuations and reducing carbon emissions in net-zero power systems.However,the efficiency and cost performance have remained significant challenges,which hinders the widespread adoption and development of BESSs.To address these challenges,this paper proposes a real-time energy management scheme that considers the involvement of prosumers to support net-zero power systems.The scheme is based on two shared energy storage models,referred to as energy storage sale model and power line lease model.The energy storage sale model balances real-time power deviations by energy interaction with the goal of minimizing system costs while generating revenue for shared energy storage providers(ESPs).Additionally,power line lease model supports peer-to-peer(P2P)power trading among prosumers through the power lines laid by ESPs to connect each prosumer.This model allows ESP to earn profits from the use of power lines while balancing power deviations and better consuming renewable energy.Experimental results validate the effectiveness of the proposed scheme,ensuring stable power supply for net-zero power systems and providing benefits for both the ESP and prosumers.展开更多
Ammonia borane(NH3BH3,AB)holds promise for chemical storage of hydrogen.However,designing superb and low-cost photocatalyst to drive hydrogen evolution from AB under visible light irradiation is highly desirable but r...Ammonia borane(NH3BH3,AB)holds promise for chemical storage of hydrogen.However,designing superb and low-cost photocatalyst to drive hydrogen evolution from AB under visible light irradiation is highly desirable but remains a major challenge for promoting the practical utilization of AB.Herein,we demonstrated a heterostructure photocatalyst consisting of zerodimensional(0D)CoP nanoparticles immobilized on two-dimensional(2D)Co_(2)P nanosheets(CoP/Co_(2)Ps)as a high-performance and low-cost catalyst for hydrogen evolution from AB hydrolysis,in which 0D/2D heterostructure was synthesized using the saltinduced phase transformation strategy.Interestingly,the optimized CoP/Co_(2)Ps exhibit a robust H_(2) evolution rate of 32.1 L∙min^(−1)∙g_(Co)^(−1),corresponding to a turnover frequency(TOF)value of 64.1 min^(−1),being among the highest TOF for non-noblemetal catalysts ever reported,even outperforming some precious metal catalysts.This work not only opens a new avenue to accelerate hydrogen evolution from AB by regulating the electronic structures of heterointerfaces,but also provides a novel strategy for the construction of precious-metal-free materials for hydrogen-related energy catalysis in the future.展开更多
Nowadays,public policies in Chile are geared to-wards the promotion of distributed energy resources(DERs)such as distributed photovoltaic(PV)systems.However,the pre-vailing socioeconomic context and the lack of incent...Nowadays,public policies in Chile are geared to-wards the promotion of distributed energy resources(DERs)such as distributed photovoltaic(PV)systems.However,the pre-vailing socioeconomic context and the lack of incentive to invest in DERs have posed a challenge to achieving the established goals in the coming years.This paper develops a three-entity ar-chitecture model and decision-making algorithms for peer-to-peer(P2P)PV energy trading.It seeks to conduct a sensitivity analysis of a P2P PV energy trading system in a community mi-crogrid,to assess the potential benefits for local communities and to encourage the development of new local public policies aimed at enhancing the profitability of DERs.Various scenarios are compared,both with and without P2P market,considering residential customers(RCs),encompassing both consumers and prosumers with PV systems,with or without battery energy storage systems(BESSs),an aggregator(AG),and utility grid(UG).Daily energy and economic transactions are examined with the aim of reducing the annual electricity bills for each RC,enhancing the profitability of DERs for prosumers,increas-ing incomes for the AG,and exploring potential benefits for the UG.The load profiles and meteorological data are collected from publicly available databases,and a novel electricity pric-ing scheme is proposed based on current rates offered by the lo-cal UG.The results demonstrate that the P2P market could lead to a reduction in the annual electricity bills by as much as 1.76%for consumers,an increase in annual income of up to 149%for prosumers,and a reduction in the payback period for their DERs by up to 0.4 years.This paper contributes to im-proving the investment in DER projects and provides a guide for extending the work to different regions of Chile and global emerging economies with DER potential.展开更多
基金supported in part by the National Science and technology support program of China No. 2014BAH29F05the National High-Tech R&D Program (863 Program) No. 2015AA01A705+3 种基金the National Natural Science Foundation of China under Grant No. 61572072the National Science and Technology Major Project No. 2015ZX03001041the Fundamental Research Funds for the Central Universities No. FRF-TP-14-046A2"Research on the System of Personalized Education using Big Data"
文摘Cloud storage has the characteristics of distributed and virtual, and it makes the ownership rights and management rights of users data separated. The master-slave architecture of cloud storage has a problem of single point failure. In this paper, we provide a cloud storage architecture model based on Semantic equivalence. According to semantic matching degree, this architecture divides the nodes into node cluster by creating semantic tree and maintains system routing through semantic hypergraph. Through simulation experiments show that dividing network into semantic can enhance scalability and flexibility of the system, and it can improve the efficiency of network organization and the security of cloud storage system, at the same time, it can also reduce the cloud data storage and the delay of reading time.
基金This work was supported in part by the National Natural Science Foundation of China(No.51607025).
文摘With the increased promotion of integrated energy power systems(IEPS),renewable energy and energy storage systems(ESS)play a more important role.However,the fluctuation and intermittent nature of wind not only results in substantial reliability and stability defects,but it also weakens the competitiveness of wind generation in the electric power market.Meanwhile,the way to further enhance the system reliability effectively improving market profits of wind farms is one of the most important aspects of Wind-ESS joint operational design.In this paper,a market-oriented optimized dispatching strategy for a wind farm with a multiple stage hybrid ESS is proposed.The first stage ESS is designed to improve the profits of wind generation through day-ahead market operations,the real-time marketbased second stage ESS is focused on day-ahead forecasting error elimination and wind power fluctuation smoothing,while the backup stage ESS is associated with them to provide the ancillary service.An interval forecasting method is adopted to help to ensure reliable forecast results of day-ahead wind power,electricity prices and loads.With this hybrid ESS design,supply reliability and market profits are simultaneously achieved for wind farms.
文摘In recent years, the increasing penetration level of renewable generation and combined heat and power(CHP) technology in power systems is leading to significant changes in energy production and consumption patterns. As a result, the integrated planning and optimal operation of a multi-carrier energy(MCE) system have aroused widespread concern for reasonable utilization of multiple energy resources and efficient accommodation of renewable energy sources. In this context, an integrated demand response(IDR) scheme is designed to coordinate the operation of power to gas(P2 G) devices, heat pumps,diversified storage devices and flexible loads within an extended modeling framework of energy hubs. Subsequently, the optimal dispatch of interconnected electricity,natural gas and heat systems is implemented considering the interactions among multiple energy carriers by utilizing the bi-level optimization method. Finally, the proposed method is demonstrated with a 4-bus multi-energy systemand a larger test case comprised of a revised IEEE 118-bus power system and a 20-bus Belgian natural gas system.
基金supported in part by the National Key Research and Development Program of China(No.2018YFA0702200)the National Natural Science Foundation of China(No.52377079)the Liaoning Revitalization Talents Program(No.XLYC2007181)。
文摘Battery energy storage systems(BESSs)serve a crucial role in balancing energy fluctuations and reducing carbon emissions in net-zero power systems.However,the efficiency and cost performance have remained significant challenges,which hinders the widespread adoption and development of BESSs.To address these challenges,this paper proposes a real-time energy management scheme that considers the involvement of prosumers to support net-zero power systems.The scheme is based on two shared energy storage models,referred to as energy storage sale model and power line lease model.The energy storage sale model balances real-time power deviations by energy interaction with the goal of minimizing system costs while generating revenue for shared energy storage providers(ESPs).Additionally,power line lease model supports peer-to-peer(P2P)power trading among prosumers through the power lines laid by ESPs to connect each prosumer.This model allows ESP to earn profits from the use of power lines while balancing power deviations and better consuming renewable energy.Experimental results validate the effectiveness of the proposed scheme,ensuring stable power supply for net-zero power systems and providing benefits for both the ESP and prosumers.
基金the National Natural Science Foundation of China(Nos.22108238,21878259,22278353,and U22A20408)the Zhejiang Provincial Natural Science Foundation of China(Nos.LR18B060001 and Z23B060009)China Postdoctoral Science Foundation(Nos.2020T130580,PC2022046,and 2019M662060).
文摘Ammonia borane(NH3BH3,AB)holds promise for chemical storage of hydrogen.However,designing superb and low-cost photocatalyst to drive hydrogen evolution from AB under visible light irradiation is highly desirable but remains a major challenge for promoting the practical utilization of AB.Herein,we demonstrated a heterostructure photocatalyst consisting of zerodimensional(0D)CoP nanoparticles immobilized on two-dimensional(2D)Co_(2)P nanosheets(CoP/Co_(2)Ps)as a high-performance and low-cost catalyst for hydrogen evolution from AB hydrolysis,in which 0D/2D heterostructure was synthesized using the saltinduced phase transformation strategy.Interestingly,the optimized CoP/Co_(2)Ps exhibit a robust H_(2) evolution rate of 32.1 L∙min^(−1)∙g_(Co)^(−1),corresponding to a turnover frequency(TOF)value of 64.1 min^(−1),being among the highest TOF for non-noblemetal catalysts ever reported,even outperforming some precious metal catalysts.This work not only opens a new avenue to accelerate hydrogen evolution from AB by regulating the electronic structures of heterointerfaces,but also provides a novel strategy for the construction of precious-metal-free materials for hydrogen-related energy catalysis in the future.
基金supported in part by the Chilean Research and Development National Agency (ANID) through the projects ANID/FONDECYT/11200178, ANID/FONDECYT/1221878, and ANID/FONDAP/1523A0006in part by Scientific Research Initiation Program (PIIC) N°033/2023 of the Universidad Técnica Federico Santa María
文摘Nowadays,public policies in Chile are geared to-wards the promotion of distributed energy resources(DERs)such as distributed photovoltaic(PV)systems.However,the pre-vailing socioeconomic context and the lack of incentive to invest in DERs have posed a challenge to achieving the established goals in the coming years.This paper develops a three-entity ar-chitecture model and decision-making algorithms for peer-to-peer(P2P)PV energy trading.It seeks to conduct a sensitivity analysis of a P2P PV energy trading system in a community mi-crogrid,to assess the potential benefits for local communities and to encourage the development of new local public policies aimed at enhancing the profitability of DERs.Various scenarios are compared,both with and without P2P market,considering residential customers(RCs),encompassing both consumers and prosumers with PV systems,with or without battery energy storage systems(BESSs),an aggregator(AG),and utility grid(UG).Daily energy and economic transactions are examined with the aim of reducing the annual electricity bills for each RC,enhancing the profitability of DERs for prosumers,increas-ing incomes for the AG,and exploring potential benefits for the UG.The load profiles and meteorological data are collected from publicly available databases,and a novel electricity pric-ing scheme is proposed based on current rates offered by the lo-cal UG.The results demonstrate that the P2P market could lead to a reduction in the annual electricity bills by as much as 1.76%for consumers,an increase in annual income of up to 149%for prosumers,and a reduction in the payback period for their DERs by up to 0.4 years.This paper contributes to im-proving the investment in DER projects and provides a guide for extending the work to different regions of Chile and global emerging economies with DER potential.
