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A coordinated operation method of wind-PV-hydrogenstorage multi-agent energy system
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作者 Tengfei Ma Wei Pei +3 位作者 Yanhong Yang Hao Xiao Chenghong Tang Weiqi Hua 《Global Energy Interconnection》 EI CSCD 2024年第4期446-461,共16页
Wind-photovoltaic(PV)-hydrogen-storage multi-agent energy systems are expected to play an important role in promoting renewable power utilization and decarbonization.In this study,a coordinated operation method was pr... Wind-photovoltaic(PV)-hydrogen-storage multi-agent energy systems are expected to play an important role in promoting renewable power utilization and decarbonization.In this study,a coordinated operation method was proposed for a wind-PVhydrogen-storage multi-agent energy system.First,a coordinated operation model was formulated for each agent considering peer-to-peer power trading.Second,a coordinated operation interactive framework for a multi-agent energy system was proposed based on the theory of the alternating direction method of multipliers.Third,a distributed interactive algorithm was proposed to protect the privacy of each agent and solve coordinated operation strategies.Finally,the effectiveness of the proposed coordinated operation method was tested on multi-agent energy systems with different structures,and the operational revenues of the wind power,PV,hydrogen,and energy storage agents of the proposed coordinated operation model were improved by approximately 59.19%,233.28%,16.75%,and 145.56%,respectively,compared with the independent operation model. 展开更多
关键词 Wind-PV-hydrogen-storage Multi-agent energy system Renewable power to hydrogen Coordinated operation Peer-to-peer power trading
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Energy Management of Networked Smart Railway Stations Considering Regenerative Braking, Energy Storage System, and Photovoltaic Units
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作者 Saeed Akbari Seyed Saeed Fazel Hamed Hashemi-Dezaki 《Energy Engineering》 EI 2023年第1期69-86,共18页
The networking of microgrids has received significant attention in the form of a smart grid.In this paper,a set of smart railway stations,which is assumed as microgrids,is connected together.It has been tried to manag... The networking of microgrids has received significant attention in the form of a smart grid.In this paper,a set of smart railway stations,which is assumed as microgrids,is connected together.It has been tried to manage the energy exchanged between the networked microgrids to reduce received energy from the utility grid.Also,the operational costs of stations under various conditions decrease by applying the proposed method.The smart railway stations are studied in the presence of photovoltaic(PV)units,energy storage systems(ESSs),and regenerative braking strategies.Studying regenerative braking is one of the essential contributions.Moreover,the stochastic behaviors of the ESS’s initial state of energy and the uncertainty of PV power generation are taken into account through a scenario-based method.The networked microgrid scheme of railway stations(based on coordinated operation and scheduling)and independent operation of railway stations are studied.The proposed method is applied to realistic case studies,including three stations of Line 3 of Tehran Urban and Suburban Railway Operation Company(TUSROC).The rolling stock is simulated in the MATLAB environment.Thus,the coordinated operation of networked microgrids and independent operation of railway stations are optimized in the GAMS environment utilizing mixed-integer linear programming(MILP). 展开更多
关键词 Energy management system(EMS) smart railway stations coordinated operation photovoltaic generation regenerative braking uncertainty scenario-based model mixed-integer linear programming(MILP)
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Electricity-Carbon Interactive Optimal Dispatch of Multi-Virtual Power Plant Considering Integrated Demand Response
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作者 Shiwei Su Guangyong Hu +2 位作者 Xianghua Li Xin Li Wei Xiong 《Energy Engineering》 EI 2023年第10期2343-2368,共26页
As new power systems and dual carbon policies develop,virtual power plant cluster(VPPC)provides another reliable way to promote the efficient utilization of energy and solve environmental pollution problems.To solve t... As new power systems and dual carbon policies develop,virtual power plant cluster(VPPC)provides another reliable way to promote the efficient utilization of energy and solve environmental pollution problems.To solve the coordinated optimal operation and low-carbon economic operation problem in multi-virtual power plant,a multi-virtual power plant(VPP)electricity-carbon interaction optimal scheduling model considering integrated demand response(IDR)is proposed.Firstly,a multi-VPP electricity-carbon interaction framework is established.The interaction of electric energy and carbon quotas can realize energy complementarity,reduce energy waste and promote low-carbon operation.Secondly,in order to coordinate the multiple types of energy and load in VPPC to further achieve low-carbon operation,the IDR mechanism based on the user comprehensive satisfaction(UCS)of electricity,heat as well as hydrogen is designed,which can effectively maintain the UCS in the cluster within a relatively high range.Finally,the unit output scheme is formulated to minimize the total cost of VPPC and the model is solved using theCPLEX solver.The simulation results showthat the proposed method effectively promotes the coordinated operation among multi-VPP,increases the consumption rate of renewable energy sources and the economics of VPPC and reduces carbon emissions. 展开更多
关键词 Virtual power plant cluster carbon quota interaction electricity interaction integrated demand response user comprehensive satisfaction coordinated optimal operation
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Auto-steering based precise coordination method for in-field multi-operation of farm machinery 被引量:4
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作者 Jie Wang Yuting Zhu +2 位作者 Zhibo Chen Lili Yang Caicong Wu 《International Journal of Agricultural and Biological Engineering》 SCIE EI CAS 2018年第5期174-181,共8页
Multi-operation within a field and multi-machinery within a machinery operation are common in the scene of scaled farm machinery service,especially with soaring usage of automated steering system in small and medium m... Multi-operation within a field and multi-machinery within a machinery operation are common in the scene of scaled farm machinery service,especially with soaring usage of automated steering system in small and medium machinery cooperatives.The object of this study was to explore a precise and efficient in-field coordination method to realize flow-shop scheduling for farm machinery fleet equipped with RTK-GNSS based auto-steering system.The new method is based on three-dimensional coordinate system(XYZ),within which the concept of field,operation strip,and operation task were defined.Under this concept framework,the operation strip state was further defined and its updating algorithm was designed,which can be used for optimization simulations and experiments.To evaluate the method,the waiting time between simulation and a real-world case was compared,and one cloud based prototype system was developed to demonstrate the practicability in the field by using NX200+automated steering system.The simulations showed that the in-field coordination can shorten the waiting time between two adjacent operations.The waiting time between rotary hoeing and seeding can be shortened from 4 h to 6.3 min.The field experiment showed that the prototype system could keep good consistency of ridges for a fleet by sharing the guidance line. 展开更多
关键词 GNSS auto-steering system in-field coordination operation farm machinery method simulation
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Using wavelet multi-resolution nature to accelerate the identification of fractional order system
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作者 李远禄 孟霄 丁亚庆 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第5期21-29,共9页
Because of the fractional order derivatives, the identification of the fractional order system(FOS) is more complex than that of an integral order system(IOS). In order to avoid high time consumption in the system... Because of the fractional order derivatives, the identification of the fractional order system(FOS) is more complex than that of an integral order system(IOS). In order to avoid high time consumption in the system identification, the leastsquares method is used to find other parameters by fixing the fractional derivative order. Hereafter, the optimal parameters of a system will be found by varying the derivative order in an interval. In addition, the operational matrix of the fractional order integration combined with the multi-resolution nature of a wavelet is used to accelerate the FOS identification, which is achieved by discarding wavelet coefficients of high-frequency components of input and output signals. In the end, the identifications of some known fractional order systems and an elastic torsion system are used to verify the proposed method. 展开更多
关键词 fractional wavelet operational torsion accelerate verify derivative decomposed integer coordinates
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Planning Method and Coordinated Operation Strategy for Multi-station Integration System
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作者 Ankang Miao Yue Yuan +1 位作者 Han Wu Junpeng Zhu 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2023年第6期2394-2408,共15页
A multi-station integration system(MSIS)integrat-ing other multi-type stations provides a new way to realize an intensive development of resources and promote low-carbon en-ergy and its high-efficiency utilization.To ... A multi-station integration system(MSIS)integrat-ing other multi-type stations provides a new way to realize an intensive development of resources and promote low-carbon en-ergy and its high-efficiency utilization.To this end,a novel multi-station integration planning method and coordinated operation strategy model for the MSIS are established in a new business model.In this study,a new business model of the MSIS,with substations as the carrier,integrating distributed photovoltaic,energy storage,electric vehicle charging,data center,and 5G base stations is proposed.From the social environment,natural conditions,and complementary characteristics,a comprehensive index system is established to analyze expansion capability of substations and multi-station combination scheme.Scenario reduction is performed by extracting feature vectors and build-ing a comprehensive evaluation function to select the optimal combination scheme under a specific scenario.Moreover,for the combination scheme in a specific scenario,the optimal ca-pacity configuration and coordinated operation strategy chance-constrained programming model of the MSIS are established under different operating conditions.Finally,simulations are performed on a practical MSIS located in Wuxi,China,and simulation results demonstrate the rationality and effectiveness of the planning method and coordinated operation strategy model for the MSIS. 展开更多
关键词 Business model comprehensive index system coordinated operation strategy multi-station combination scheme multi-station integration system planning method
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Multi-Objective Sizing of Solar-Wind-Hydro Hybrid Power System with Doubled Energy Storages Under Optimal Coordinated Operational Strategy
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作者 Su Guo Aynur Kurban +3 位作者 Yi He Feng Wu Huanjin Pei Guotao Song 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2023年第6期2144-2155,共12页
More and more attention has been paid to the high penetration of renewable energy in recent years.The randomness and intermittency of solar and wind energy make it an inevitable trend that renewables are coupled with ... More and more attention has been paid to the high penetration of renewable energy in recent years.The randomness and intermittency of solar and wind energy make it an inevitable trend that renewables are coupled with energy storage technologies.Pumped hydro storage(PHS)is the most widelyused storage form in the power grid but the capacity is limited by geographic conditions.The concentrated solar power(CSP)plant with a thermal energy storage(TES)system can realize easier grid connections and effective peak shaving.Therefore,this paper proposes a solar-wind-hydro hybrid power system with PHS-TES double energy storages,and investigates the optimal coordinated operational strategy and multi-objective sizing.The optimal sizing problem which considers the minimum levelized cost of energy(LCOE)and loss of power supply probability(LPSP)as objectives is solved by multi-objective particle swarm optimization.Moreover,the seasonal uncertainties of renewables are considered by applying a scenario-based analysis using Kmeans clustering.Finally,a case study reveals the effectiveness of the coordinated operational strategy and double energy storages from the perspectives of economy and reliability.The comparisons of optimal sizing results show that the PV-WindCSP-PHS system decreases the LCOE by 19.1%compared to a PV-Wind-CSP system under the same LPSP,and reduces the LPSP compared to PV-Wind-PHS systems with limited reservoir capacity,which indicates that the proposed system with double energy storages has better economy and reliability performance compared to single storage. 展开更多
关键词 Coordinated operation strategy double energy storages hybrid renewable energy system multi-objective sizing optimization solar-wind-hydro
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Robustly Coordinated Operation of an Emission-free Microgrid with Hybrid Hydrogen-battery Energy Storage 被引量:1
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作者 Feilong Fan Rui Zhang +1 位作者 Yan Xu Shuyun Ren 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2022年第2期369-379,共11页
High intermittence of renewable energy resources(RESs)and restriction for greenhouse gas(GHG)emissions have significantly challenged the operations of traditional diesel generator(DG)based microgirds.This paper consid... High intermittence of renewable energy resources(RESs)and restriction for greenhouse gas(GHG)emissions have significantly challenged the operations of traditional diesel generator(DG)based microgirds.This paper considers an emission-free microgid with hybrid hydrogen-battery energy storage(HHBES)and proposes a coordinated operational strategy to minimize its daily operation costs.In addition to the electricity purchase costs in the day-ahead market and the operational costs of RESs,the total degradation cost of HHBES is also included in the cost calculation.The proposed operational strategy consists of two coordinated stages.At the day-ahead stage,the schedule for the tie-line power is exchanged with the main grid,the output power of the fuel cell(FC)and the input power of the electrolysis device(ED)are optimized under the worst case of uncertain power output from RESs and power demand from electricity loads(ELs).At the intra-day stage,the battery power is determined according to the short-term prediction for the power of RESs and ELs.The problem is formulated as a robust optimization model and solved by a two-level column-andconstraint-generation(C&CG)algorithm.Numerical simulations using Australian energy market operator(AEMO)data are carried out to validate the effectiveness of the proposed strategy. 展开更多
关键词 Column-and-constraint-generation algorithm coordinated operation emission-free microgrid hybrid hydrogen-battery storage robust optimization
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Design of image-side telecentric freeform imaging systems based on a point-by-point construction-iteration process 被引量:3
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作者 杨通 金国藩 朱钧 《Chinese Optics Letters》 SCIE EI CAS CSCD 2017年第6期77-81,共5页
In this Letter, we present a novel design method of image-side telecentric freeform imaging systems. The freeform surfaces in the system can be generated using a point-by-point design approach starting from an initial... In this Letter, we present a novel design method of image-side telecentric freeform imaging systems. The freeform surfaces in the system can be generated using a point-by-point design approach starting from an initial system consisting of simple planes. The proposed method considers both the desired object–image relationships and the telecentricity at the image-side during the design process. The system generated by this method can be taken as a good starting point for further optimization. To demonstrate the benefit and feasibility of our method,we design two freeform off-axis three-mirror image-side telecentric imaging systems in the visible band. The systems operate at F/1.9 with a 30 mm entrance pupil diameter and 5° diagonal field-of-view. The modulation-transfer-function curves are above 0.69 at 100 lps/mm. 展开更多
关键词 iteration mirror desired starting entrance diagonal visible operate infinity coordinates
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Trajectory planning and base attitude restoration of dual-arm free-floating space robot by enhanced bidirectional approach
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作者 Zongwu XIE Xiaoyu ZHAO +2 位作者 Zainan JIANG Haitao YANG Chongyang LI 《Frontiers of Mechanical Engineering》 SCIE CSCD 2022年第1期2-17,共16页
When free-floating space robots perform space tasks,the satellite base attitude is disturbed by the dynamic coupling.The disturbance of the base orientation may affect the communication between the space robot and the... When free-floating space robots perform space tasks,the satellite base attitude is disturbed by the dynamic coupling.The disturbance of the base orientation may affect the communication between the space robot and the control center on earth.In this paper,the enhanced bidirectional approach is proposed to plan the manipulator trajectory and eliminate the final base attitude variation.A novel acceleration level state equation for the nonholonomic problem is proposed,and a new intermediate variable-based Lyapunov function is derived and solved for smooth joint trajectory and restorable base trajectories.In the method,the state equation is first proposed for dual-arm robots with and without end constraints,and the system stability is analyzed to obtain the system input.The input modification further increases the system stability and simplifies the calculation complexity.Simulations are carried out in the end,and the proposed method is validated in minimizing final base attitude change and trajectory smoothness.Moreover,the minute internal force during the coordinated operation and the considerable computing efficiency increases the feasibility of the method during space tasks. 展开更多
关键词 free-floating space robot dual arm coordinated operation base attitude restoration bidirectional approach
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