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Inverse Proportion Technique Based Scheduling Strategy for energy Storage system Considering Load Demand Differences

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CSEE Journal of power and energy systems 2022年第5期8卷 1487-1496页

作者： Hejun Yang Zhenyu Hao Yinghao Ma Dabo Zhang Anhui Provincial Key Laboratory of Renewable Energy Utilization and Energy Saving Hefei University of TechnologyHefei 230009China State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400044Chin

The energy storage system(ESS)as a demand-side management(DSM)resource can effectively smooth the load power fluctuation of a power ***,designing a more reasonable ESS operational strategy will be a prerequisite before incorporating the energy storage device into *** different load levels have different demands for the real-time chargedischarge power of an ESS,this paper proposes a heuristic ESS operation scheduling strategy which can take into account the electrical load demand *** this paper,firstly,two demand degree concepts for charging power and discharging power are defined to describe the differentiated ESS demand under the condition of different electrical load ***,an inverse proportion technique based ESS scheduling strategy,with the consideration of the load demand difference,is proposed in this ***,some evaluating indices are defined in this paper for describing the influence of the proposed strategy on the smoothing degree of the daily load ***,several case studies are designed to verify the validity and correctness of the proposed technique,and the results show that the proposed technique can effectively smooth the load curve and improve the ability of peak shaving and valley filling.

关键词： Demand response energy storage system load demand difference operation scheduling strategy peak shaving and valley filling

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Investigation on method of characteristics and semi-implicit method for pressure linked equations algorithms for water hammer based on unsteady friction

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Journal of Hydrodynamics 2024年第6期36卷 1155-1166页

作者： Zong-ku Liu Guo-hong Wu Hao Wang Jia-xiang Zhang Xue-lin Tang Xiao-qin Li College of Water Resources and Civil Engineering China Agricultural UniversityBeijing100083China Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System China Agricultural UniversityBeijing100083China State Key Laboratory of Hydroscience and Engineering and Department of Energy and Power EngineeringTsinghua UniversityBeijing100084China

The misoperation of hydraulic components such as pumps and valves in pressurized pipelines triggers water hammer phenomena and seriously threats the safe operation of hydraulic *** present,the main water hammer simulation methods are method of characteristics(MOC),and further investigation of new algorithms is ***,a new method for simulating the water hammer using the finite volume method(FVM),semi-implicit method for pressure linked equations(SIMPLE)algorithm is proposed in the present *** with the experimental data,the accuracy and reliability of the proposed algorithm are *** show that the IAB,MIAB friction models not only predict the first pressure peak but also accurately predict the pressure *** the comparison of the MOC,SIMPLE algorithms,the results of the two algorithms are almost the same in front of the valve,while near the upstream tank,when using the same friction model,the pressure attenuation predicted by the SIMPLE algorithm is slightly greater than that of the MOC method and closer to the experimental ***,the newly proposed algorithm can serve as an alternative to the MOC method in simulating water *** investigation enriches the numerical methods of hydraulic transients and lays the foundation for subsequent program development.

关键词： Hydraulic transient semi-implicit method for pressure linked equations(SIMPLE)algorithm Navier-Stokes equations finite volume method(FVM)

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L_(p) Quasi Norm State Estimator for power systems

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Journal of Modern power systems and Clean energy 2022年第4期10卷 871-882页

作者： Zhongliang Lyu Hua Wei Xiaoqing Bai Daiyu Xie Le Zhang Peijie Li School of Electrical Engineering Guangxi UniversityNanningChinaand they are also with the Guangxi Key Laboratory of Power System Optimization and Energy TechnologyGuangxi UniversityNanningChin Power Dispatching Control Center of Guangxi Power Grid NanningChina

This paper proposes an L_(p)(0<p<1)quasi norm state estimator for power system static state *** with the existing L1 and L2 norm estimators,the proposed estimator can suppress the bad data more *** robustness of... 详细信息

This paper proposes an L_(p)(0power system static state *** with the existing L1 and L2 norm estimators,the proposed estimator can suppress the bad data more *** robustness of the proposed estimator is discussed,and an analysis shows that its ability to suppress bad data increases as p ***,an algorithm is suggested to solve the nonconvex state estimation *** introducing a relaxation factor in the mathematical model of the proposed estimator,the algorithm can prevent the solution from converging to a local optimum as much as ***,simulations on a 3-bus DC system,the IEEE 14-bus and IEEE 300-bus systems as well as a 1204-bus provincial system verify the high computation efficiency and robustness of the proposed estimator.

关键词： power system bad data quasi norm estimator robustness state estimation

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Study on Compatibility of Vegetable Insulating Oils and Mineral Insulating Oils for Transformer Based on Molecular Simulation Methods 10th

Study on Compatibility of Vegetable Insulating Oils and Mine...

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10th International Conference of Pioneering Computer Scientists, Engineers and Educators, ICPCSEE 2024

作者： Mu, Xiaojing Wu, Wenliang Liu, Xichao Wan, Gang Wang, Yang Lv, Weijie Quality Inspection and Test Center for Equipment of Electric Power China Electric Power Research Institute Beijing China Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi University Nanning China

ISBN: (纸本)9789819787425

Traditional mineral insulating oils have problems such as environmental pollution and low fire resistance. Vegetable insulating oils are prepared from vegetable oils through refining and modification processes and have high fire resistance and renewability. However, vegetable insulating oils have high viscosity and poor heat dissipation performance. Hybrid insulating oils can complement single insulating oils by mixing mineral and vegetable insulating oils. This paper investigates the compatibility between palm oil and mineral oil. COSMO calculations of triglyceride and mineral oil alkane molecules were performed using molecular simulations and the COSMO-RS model. We have carried out separate calculations of the molecular surface charge densities (σ-spectra) for four major triglycerides within the palm oil as well as for three major carbon 20 alkane molecules within the naphthenic mineral oil. We illustrate the polarity relationship between the glyceride molecules and alkane molecules of mineral oils and derive the principle of similar intercalation of the glyceride molecules with the alkane molecules of mineral oils from the microscopic point of view of the molecules. The findings suggest that palm oil and the mineral oil possess comparable forces between the molecules, which allows for stable blending. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Mineral oils

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Bi-objective Layout optimization for Multiple Wind Farms Considering Sequential Fluctuation of Wind power Using Uniform Design

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CSEE Journal of power and energy systems 2022年第6期8卷 1623-1635页

作者： Yinghao Ma Kaigui Xie Yanan Zhao Hejun Yang Dabo Zhang Anhui Province Key Laboratory of Renewable Energy Utilization and Energy Saving Hefei University of TechnologyHefei 230009China State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400044China School of Computer Science and Technology at University of Science and Technology of China Hefei 230027China

The fluctuation of wind power brings great challenges to the secure,stable,and cost-efficient operation of the power *** of the time-correlation of wind speed and the wake effect of wind turbines,the layout of wind farm has a significant impact on the wind power sequential *** order to reduce the fluctuation of wind power and improve the operation security with lower operating cost,a bi-objective layout optimization model for multiple wind farms considering the sequential fluctuation of wind power is proposed in this *** goal is to determine the optimal installed capacity of wind farms and the location of wind *** proposed model maximizes the energy production and minimizes the fluctuation of wind power *** improve the accuracy of wind speed estimation and hence the power calculation,the timeshifting of wind speed between the wind tower and turbines’locations is also considered.A uniform design based two-stage genetic algorithm is developed for the solution of the proposed *** studies demonstrate the effectiveness of this proposed model.

关键词： Wind farm layout optimization(WFLO) wind power fluctuation bi-objective optimization uniform design

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In situ reconstruction induced oxygen-deficient multiphase Cu based species hybridized with Ni single atoms as tandem platform for CO_(2) electroreduction

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Nano Research 2024年第5期17卷 3888-3894页

作者： Juzhe Liu Yuheng Wang Pengpeng Mo Feng Yang Kaiqi Jiang Zhixiang Cheng Yuxuan Liu Zhiyi Sun Zheng Liu Yimei Zhang Wenxing Chen The Key Laboratory of Resources and Environmental System Optimization Ministry of EducationCollege of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China Energy&Catalysis Center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China SEPA Key Laboratory of Eco-Industry Chinese Research Academy of Environmental SciencesBeijing 100012China

Tandem catalysis,capable of decoupling individual steps,provides a feasible way to build a high-efficiency CO_(2) electro-conversion system for multicarbons(C_(2+)).The construction of electrocatalytic materials is one of focusing ***,we fabricated a single atom involved multivalent oxide-derived Cu composite material and found it inclined to reconstruct into oxygen-deficient multiphase Cu based species hybridized with monatomic Ni on N doped C *** this prototype,rapid CO generation and C-C coupling are successively achieved on NiN4 sites and surface amorphized Cu species with defects,resembling a micro-production *** this way,the in situ formed tandem catalyst exhibited a high Faradaic efficiency(FE)of~78%for C_(2+)products along with satisfactory durability over 50 ***,the reconstruction-induced amorphous layer with abundant asymmetric sites should be favorable to improve the ethanol selectivity(FE:63%),which is about 10 times higher than that of the non-tandem Cu-based contrast *** work offers a new approach for manipulating tandem catalyst systems towards enhancing C_(2+)products.

关键词： tandem catalysis single atom reconstruction amorphous CO_(2)reduction reaction

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Research on OPF control of three-phase four-wire low-voltage distribution network considering uncertainty

arXiv

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arXiv 2024年

作者： Wang, Rui Bai, Xiaoqing Huang, Shengquan Wei, Shoupu Guangxi Key Laboratory of Power System Optimization and Energy‑Saving Technology College of Electrical Engineering Guangxi University Nanning530004 China

As power systems become more complex and uncertain, low-voltage distribution networks face numerous challenges, including three-phase imbalances caused by asymmetrical loads and distributed energy resources. We propose a robust stochastic optimization (RSO) based optimal power flow (OPF) control method for three-phase, four-wire low-voltage distribution networks that consider uncertainty to address these issues. Using historical data and deep learning classification methods, the proposed method simulates optimal system behaviour without requiring communication infrastructure. The simulation results verify that the proposed method effectively controls the voltage and current amplitude while minimizing the operational cost and three-phase imbalance within acceptable limits. The proposed method shows promise for managing uncertainties and optimizing performance in low-voltage distribution networks. © 2024, CC BY.

关键词： energy resources

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Electrochemical extraction of strontium from molten salts using reactive zincand aluminum electrodes

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International Journal of Minerals,Metallurgy and Materials 2025年第4期32卷 892-901页

作者： Yongcheng Zhang Taiqi Yin Lei Zhang Xiaochen Zhang Tao Bo Xiaoli Tan Mei Li Wei Han Zhejiang Key Laboratory of Data-Driven High-Safety Energy Materials and Applications Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Materials Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001China MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China Qianwan Institute of CNITECH Ningbo 315336China

Herein, the electrochemical behaviors of Sr on inert W electrode and reactive Zn/Al electrodes were systematically investig-ated in LiCl–KCl–SrCl2molten salts at 773 K using various electrochemical methods. The chemical reaction potentials of Li and Sr on re-active Zn/Al electrodes were determined. We observed that Sr could be extracted by decreasing the activity of the deposited metal Sr onthe reactive electrode, although the standard reduction potential of Sr(II)/Sr was more negative than that of Li(I)/Li. The electrochemicalextraction products of Sr on reactive Zn and Al electrodes were Zn13Sr and Al4Sr, respectively, with no codeposition of Li *** on the density functional theory calculations, both Zn13Sr and Al4Sr were identified as stable intermetallic compounds with Zn-/Al-rich phases. In LiCl–KCl molten salt containing 3wt% SrCl2, the coulombic efficiency of Sr in the Zn electrode was ~54%. The depolar-ization values for Sr on Zn and Al electrodes were 0.864 and 0.485 V, respectively, exhibiting a stronger chemical interaction between Znand Sr than between Al and Sr. This study suggests that using reactive electrodes can facilitate extraction of Sr accumulated while elec-trorefining molten salts, thereby enabling the purification and reuse of the salt and decreasing the volume of the nuclear waste.

关键词： strontium reductive extraction molten salt depolarization effect reactive electrode

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Non-contact gaseous microplasma electrode as anode for electrodeposition of metal and metal alloy in molten salt

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Chinese Chemical Letters 2024年第4期35卷 166-169页

作者： Junhan Luo Qi Qing Liqin Huang Zhe Wang Shuang Liu Jing Chen Yuexiang Lu Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China The MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China Nuclear Research Institute for Future Technology and Policy Seoul National UniversitySeoul 08826Republic of Korea

Microplasma based on glow discharge could act as a non-contact gaseous electrode and has attracted much attention in both fundamental research and application. Herein, with microplasma as the anode,the electrodeposition process of a series of metal and metal alloys in molten salt has been systemically studied. Four metal cations with different valence states, silver(Ag~+), nickel(Ni^(2+)), copper(Cu^(2+)), and iron(Fe^(3+)), could all be reduced on the solid cathode with high current efficiency and the corresponding metal products were of high purity. The electrodeposition of aluminum-lanthanum(Al-Ln) alloy on the aluminum cathode was also successfully carried out with microplasma as the anode, and the same alloy was obtained by using the conventional anode electrode. These results indicated that microplasma anode based on non-contact direct-current(DC) glow discharge is a promising electrode to be applied in molten salt electrolysis.

关键词： Microplasma Anode Molten salt Electrodeposition Al-Ln alloy

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Agent Simulation-Based Market Clearing Model for Reactive Auxiliary Services 6

Agent Simulation-Based Market Clearing Model for Reactive Au...

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6th IEEE Conference on energy Internet and energy system Integration, EI2 2022

作者： Qi, Le Chen, Mingyuan Song, Jifeng Zhang, Minyu Zheng, Wenbin Shang, Qinghua Power Dispatching Control Center of Guangxi Power Grid Co. Ltd. Nanning China Guangxi University Key Laboratory of Guangxi Electric Power System Optimization and Energy-Saving Technology Nanning China

ISBN: (纸本)9798350347159

Reactive power is local and needs to be consumed locally;therefore, this paper investigates a sub-regional local market for reactive auxiliary services, where the power trading agency is responsible for receiving and aggregating the operating cost bids and opportunity loss bids from power generating companies. The power dispatch agency aims to minimize each local market's reactive power procurement costs, thereby minimizing reactive power generation subject to system constraints and voltage support. In this paper, a sub-regional reactive auxiliary services market clearing model with distributed energy participation is proposed and tested on an IEEE 24 bus system with each region as a node. The results show that the reactive market mechanism provided in this paper can incentivize extensive participation of new energy units and maintain sufficient reactive reserves and that the market power of individual units can be controlled within reasonable limits. © 2022 IEEE.

关键词： Reactive power

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