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Adaptive model predictive scheduling of flexible interconnected low-voltage distribution networks considering charging preferences of electric vehicles

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FRONTIERS IN ENERGY RESEARCH 2022年 10卷

作者： Yang, Haiyue Yuan, Shenghui Wang, Zhengping Qiu, Xinjie Liang, Dong Hengshui Power Supply Co State Grid Hebei Elect Power Co Hengshui Hebei Peoples R China Hengshui Elect Power Design Co Ltd Hengshui Hebei Peoples R China Hebei Univ Technol State Key Lab Reliabil & Intelligence Elect Equipm Tianjin Peoples R China

DC interconnection at the second side of distribution transformers helps achieve power sharing among nearby low-voltage distribution networks (LVDNs) and promote integration of intermittent inverter-based distributed generators (DGs). This paper proposes an adaptive model predictive scheduling method for flexible interconnected LVDNs considering charging preferences of electric vehicles (EVs). Firstly, the steady-state models of flexible resources including voltage source converters, energy storage systems along with AC and DC power flow models are established. Then, a model predictive control (MPC)-based rolling optimization model is formulated aiming to minimize the daily energy loss considering uncertainties of DGs, load and each charging station as a whole. To further explore the flexibility and dispatchability of each charging station, an adaptive MPC-based rolling optimization model is built considering three types of EVs with different charging preferences, i.e., uncontrollable EVs, charging-only EVs and vehicle-to-grid EVs. The scheduling window of the adaptive MPC-based scheduling is dynamically updated according to the maximum departure time of currently charging EVs to fulfill expected energy requirements of all EVs. Simulation results on a typical flexible LVDN show that the daily energy loss and total load fluctuation can be further reduced through real-time scheduling of controllable EVs in addition to existing flexible resources.

关键词： optimal scheduling flexible low-voltage distribution network adaptive model predictive control electric vehicles charging preference

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Conceptual design of Intelligent Manufacturing Equipment Based on a Multi-source Heterogeneous Requirement Mapping Method 14th

Conceptual Design of Intelligent Manufacturing Equipment Bas...

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14th IFAC Workshop on Intelligent Manufacturing Systems (IMS)

作者： Wu, Bo Zhao, Wu Hu, Huicong Liu, Ying Lv, Junjie Sichuan Univ Sch Mech Engn Chengdu 610065 Peoples R China Sichuan Univ Innovat Method & Creat Design Key Lab Sichuan Pro Chengdu 610065 Peoples R China Harbin Inst Technol Shenzhen Dept Design Shenzhen 518000 Guangdong Peoples R China Cardiff Univ Inst Mech & Mfg Engn Sch Engn Cardiff CF24 3AA Wales Tianfu New Area Power Supply Co State Grid Sichuan Elect Power Co Chengdu 610041 Peoples R China

Intelligent manufacturing equipment constitutes important prerequisite and foundation for processing and manufacturing. In its conceptual design process, functional determination based on customer needs (CAs), intelligence demands (IDs) and manufacture constraints (MCs) is the prerequisite and basis for subsequent design work. As these various requirement information becomes more complex and mixed, a practical design method will improve the design efficiency of this type of problem. Although research on requirement acquisition and transformation methods has been intensively studied, this problem is still difficult to solve by traditional methods due to the multi-source heterogeneous characteristics of requirement information. To overcome this problem, a requirements mapping methodology is proposed to decompose and transform multi-source heterogeneous requirements and map them to different functional knowledge (FK). Multi-source design requirements are categorized by different objectives such as manufacturing, customer, and intelligence, and these heterogeneous information is analyzed by the decomposition method corresponding to them. The conceptual scheme (CS) is derived through a four-step selection process: requirement set (RS) determination, FK mapping, knowledge combination, and scheme evaluation. The prototype design and an experimental study of a brand-new intelligent folding gantry crane is conducted. The results show that the proposed method can not only improve the design efficiency of intelligent manufacturing equipment, but also reduce the repetitive work in the detailed design stage.

关键词： Product design Collaborative design Intelligent manufacturing

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A superhydrophobic film of photovoltaic modules and self-cleaning performance

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SOLAR ENERGY 2021年 226卷 92-99页

作者： Wang, Ping Wang, Huiyue Li, Jian Ni, Lei Wang, Linhong Xie, Jiejie Chongqing Univ State Key Lab Power Transmiss Equipment & Syst Se Chongqing 400044 Peoples R China China Southwest Architectural Design & Res Inst C Chengdu 610041 Sichuan Peoples R China Chongqing Coll Elect Engn Chongqing 400013 Peoples R China State Grid Jiaxing Power Supply Co Xiuzhou Customer Serv Branch Ctr Hangzhou 314000 Zhejiang Peoples R China

For photovoltaic (PV) modules, dust accumulation is one of the reasons for the reduction of output power, while conventional cleaning is expensive and inefficient for large scale PV power plants. Therefore, the research of superhydrophobic self-cleaning thin film on PV modules is proposed in this paper. The preparation of superhydrophobic film combines the low surface energy layer and anti-reflection layer which enhances the adhesion between the superhydrophobic film and the glass substrate by forming the stable covalent bonds. Its fundamental characteristics were tested and analyzed including transmittance, contact angle, micromorphology and energy spectrum. Finally, the effect of the superhydrophobic film on the self-cleaning performance and improvement of output power were investigated after coating the film on PV modules. The comparison results show that the prepared superhydrophobic thin film not only has anti-reflection and self-cleaning ability to improve the transmittance and output power of the PV modules, but also has excellent weatherability by forming stable covalent bonds through dehydration reactions.

关键词： Superhydrophobic film Photovoltaic modules Anti-reflection Self-cleaning Weatherability Output power

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FLEXIBLE ADAPTIVE MARINE PREDATOR ALGORITHM FOR HIGH-DIMENSION OPTIMIZATION AND APPLICATION IN WIND TURBINE FAULT DIAGNOSIS

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FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY 2023年第6期31卷 2340142-2340142页

作者： Tang, Mingzhu Yi, Jiabiao Wu, Huawei Wang, Yang Cao, Chenhuan Liang, Zixin Zuo, Jiawen Xiong, Fuqiang Changsha Univ Sci & Technol Coll Energy & Power Engn Changsha 410114 Peoples R China Hubei Univ Arts & Sci Hubei Key Lab Power Syst Design & Test Elect Vehic Xiangyang 441053 Peoples R China Shanghai Dianji Univ Sch Elect Engn Shanghai 201306 Peoples R China Zhejiang Univ Inst Ind Proc Control Coll Control Sci & Engn State Key Lab Ind Control Technol Hangzhou 310058 Peoples R China State Grid Hunan Extra High Voltage Substn Co Changsha 410029 Peoples R China State Grid Hunan Elect Power Co Ltd Substn Intelligent Operat & Inspect Lab Changsha 410029 Peoples R China

The marine predator algorithm (MPA) is the latest metaheuristic algorithm proposed in 2020, which has an outstanding merit-seeking capability, but still has the disadvantage of slow convergence and is prone to a local optimum. To tackle the above problems, this paper proposed the flexible adaptive MPA. Based on the MPA, a flexible adaptive model is proposed and applied to each of the three stages of population iteration. By introducing nine benchmark test functions and changing their dimensions, the experimental results show that the flexible adaptive MPA has faster convergence speed, more accurate convergence ability, and excellent robustness. Finally, the flexible adaptive MPA is applied to feature selection experiments. The experimental results of 10 commonly used UCI high-dimensional datasets and three wind turbine (WT) fault datasets show that the flexible adaptive MPA can effectively extract the key features of high-dimensional datasets, reduce the data dimensionality, and improve the effectiveness of the machine algorithm for WT fault diagnosis (FD).

关键词： Marine Predator Algorithm Flexible Adaptive Function Feature Selection Wind Turbine Fault Diagnosis

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Research on dual-mode communication technology based on power line carrier and micro power wireless 3

Research on dual-mode communication technology based on powe...

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2021 3rd International Conference on Artificial Intelligence and Computer Science, AICS 2021

作者： Long, Yan Chen, Yongli Zhang, Xudong Xiao, Deyong Li, Zheng Tang, Xiaoke State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing100192 China Beijing Engineering Research Center of High-Reliability IC with Power Industrial Grade Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing100192 China State Grid Hebei Electric Power Co. Ltd. Shijiazhuang050000 China

At present, the power meter reading system mainly uses the single power line carrier meter reading mode or the single micro power wireless meter reading mode. Due to the disadvantages of the two modes, the single meter reading mode can not meet the meter reading under different environmental conditions. In order to improve the success rate of communication, this paper puts forward the dual-mode communication technology of power line carrier and micro power wireless integration, which is based on the power line carrier It overcomes the defects of single meter reading mode and improves the real-time performance, reliability and success rate of meter reading. © Journal of Physics: Conference Series 2021.

关键词： Dual mode communication Micro power wireless communication power line carrier

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A new security authentication method for master station and terminal

A new security authentication method for master station and ...

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IEEE International Conference on Energy Internet (ICEI)

作者： Fan He Zhengquan Ang Qingqin Fu Guanglun Yang Pingjiang Xu Jia Liu Ling Yi Changsheng Niu Jiankui Liu Yuqiang Jiang Technology Co.Ltd. Beijing China Beijing aerospace flight control center. Beijing China Key Lab of Power Grid Design and Analysis State Grid Corporation of China Beijing China

ISBN: (纸本)9781665407359

This paper analyzes the shortcomings of the traditional master station and terminal security authentication method, and proposes a new security authentication method for the master station and the terminal. This method uses a combination of session initialization and recovery, and session negotiation instructions to complete security authentication. The user can optionally execute the corresponding application instruction according to the actual application, thereby improving the security of the authentication and the randomness of the session key of the subsequent business operation.

关键词： Conferences Authentication Internet Security Business

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Regulating microstructure and composition by carbonizing in-situ grown metal-organic frameworks on cotton fabrics for boosting electromagnetic wave absorption

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Nano Research 2024年第8期17卷 7290-7300页

作者： Jie Jin Hongsen Long Hu Liu Yan Guo Tiantian Bai Ben Bin Xu Mohammed A.Amin Hua Qiu Mohamed H.Helal Chuntai Liu Changyu Shen Zeinhom M.El-Bahy Zhanhu Guo State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002China China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410000China School of Electronic Engineering North China University of Water Resources and Electric PowerZhengzhou 450046China Complex Conditions of High-end Tire Technology Innovation Center Shuguang Rubber Industry Research&Design Institute Co.LtdGuilin 541004China Integrated Composites Lab Department of Mechanical and Civil EngineeringNorthumbria UniversityNewcastle Upon TyneNE18STUK Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Department of Chemistry Faculty of Arts and ScienceNorthern Border UniversityRafha 73213Saudi Arabia Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City 11884CairoEgypt

High-temperature carbonized metal-organic frameworks(MOFs)derivatives have demonstrated their superiority for promising electromagnetic wave(EMW)absorbers,but they still suffer from limited EMW absorption capacity and narrow *** the advantage of microstructure and chemical composition regulation for the design of EMW absorber,hierarchical heterostructured MoS_(2)/CoS_(2)-Co_(3)O_(4)@cabonized cotton fabric(CF)(MCC@CCF)is prepared by growing ZIF-67 MOFs onto CF surface,chemical etching,and *** from the dual loss mechanism of magnetic-dielectric multicomponent carbonized MOFs,chemical etching and carbonization process can effectively introduce abundant micro-gap structure that can result in better impedance matching and stronger absorption capacity via internal reflection,doped heteroatoms(Mo,N,S)to supply additional dipolar polarization loss,and numerous heterointerfaces among MoS_(2),CoS_(2),Co_(3)O_(4),and CCF that produce promoted conduction loss and interfacial polarization ***,a minimal reflection loss of−52.87 dB and a broadest effective absorption bandwidth of 6.88 GHz were achieved via tunning the sample thickness and filler loading,showing excellent EMW absorption *** research is of great value for guiding the research on MOFs derivatives based EMW absorbing materials.

关键词： metal-organic frameworks hierarchical structure chemical etching sulfurization electromagnetic wave absorption

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design of Quantum key Fusion Model for power Multi-terminal 3

Design of Quantum Key Fusion Model for Power Multi-terminal

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3rd IEEE International Conference on Information Systems and Computer Aided Education, ICISCAE 2020

作者： Xia, Shaoxian Wang, Zheng Hou, Zhanbin Ye, Hongshu Xue, Binbin Wang, Shouzhi Zhang, Xuecheng Yang, Kewen State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing China

ISBN: (纸本)9781728183039

With the construction of State grid informatization, professional data such as operation inspection, marketing, and regulation have gradually shifted from offline to online. In recent years, cyberspace security incidents have occurred frequently, and national and group cybersecurity threats have emerged. As the next-generation communication system, quantum security has to satisfy the security requirements. Also, it is especially important to build the fusion application of energy network quantum private communication technology and conventional network, and to form a safe and reliable quantum-level communication technology solution suitable for the power grid. In this paper, from the perspective of the multi-terminal quantum key application, combined with a mature electricity consumption information collection system, a handheld meter reading solution based on quantum private communication technology is proposed to effectively integrate the two and achieve technological upgrading. First, from the technical theory and application fields, the current situation of quantum private communication technology and its feasibility of combining with classical facilities are introduced and analyzed. Then, the hardware security module and handheld meter reading terminal equipment are taken as typical examples to design and realize quantum key shared storage, business security process application model;finally, based on the overall environment of quantum key distribution, the architecture design of multi-terminal quantum key application verification is implemented to verify the quantum key business application process. © 2020 IEEE.

关键词： Informatization

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Dynamic Comprehensive Assessment of power Development Based on Provincial Data

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CSEE Journal of power and Energy Systems 2020年第3期6卷 672-680页

作者： Wei Hu Qiuting Guo Yifan Zhou Yi Kang Huanshuai Bing Dan Bao State Key Lab of Power Systems the Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Central Southern China Electric Power Design Institute China Power Engineering Consulting Group CorporationWuhan 430071China Northeast Branch State Grid Corporation of ChinaShenyang 110180China

Dynamic comprehensive assessment of regional power industry development levels is of paramount importance for understanding the development characteristics and potential of the local power industry.A tri-level evaluation index system is established,describing five aspects of the local power industry development level,specifically,the coordination degree between the power industry and economy/energy,power generation,power consumption,power supply and development potential.A combination of information entropy and the analytic hierarchy process(AHP)is used to establish a static evaluation model,and a blend of subjective opinions and objective data information is then *** aggregating the static evaluation model for each time period based on a time-ordered weighting vector calculated using time-ordered information entropy,a dynamic comprehensive evaluation model of power industry development level is *** considering provincial data from China recorded during 2007 to 2016 as the sample set,through synchronic and diachronic comparisons of the evaluation results,the differences,characteristics and potential of local power industry development in China are explored.

关键词： Analytic hierarchy process development level of power electric industry dynamic comprehensive assessment information entropy

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Space Charge Behavior of Thermally Aged Polyethylene Insulation of Track Cables

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POLYMERS 2022年第11期14卷 2162-2162页

作者： Qiao, Zhichao Wu, Wangsong Wang, Zhaowei Zhang, Ling Zhou, Yuanxiang CRSC Res & Design Inst Grp Co Ltd Beijing 100070 Peoples R China Tsinghua Univ Dept Elect Engn State Key Lab Power Syst Beijing 100084 Peoples R China Wuwei Elect Power Supply Co State Grid Wuwei 733000 Peoples R China

The interface of multi-layer insulation is a relatively weak point in the cable system during the long-term high-temperature service. Space charge is prone to continuously accumulate in the interface area, leading to the deterioration of electrical properties and even insulation failure in advance. The knowledge about thermal oxidation of polyethylene (PE) materials at the molecular level is still urgent to explore. Herein, single-layer and double-layer PE insulation, representing the typical insulation structure of frequency-shift pulse voltage track cables, were prepared and thermally aged in the oven for up to 360 h. Thermal, mechanical, electrical, and space charge characterizations were systematically carried out. Thermogravimetric analyzer and oxidation induced temperature (OIT) measurements confirmed that LDPE's thermal-oxidative aging temperature range was the lowest among the three PE groups in the O-2 atmosphere. After 360 h thermal aging, the tensile property of HDPE material kept relatively stable, while the elongation at break of the other two groups was lower than 50%. Unaged HDPE exhibits apparent charge injection and migration, leading to the severe electric field distortion of 20%. Noticeable charge accumulation can be observed at the unaged double-layer sample interface due to the mismatching of DC conductivity, which play a significant role in the aged double-layer samples. This work utilizes precise thermal analysis to provide new information about the resistance ability of thermal oxidation of LDPE, FPE, and HDPE, and its influence on space charge behaviors, which is helpful for the insulation design and evaluation in cable applications.

关键词： multi-layer insulation polyethylene space charge thermal aging tensile strength oxidation induced temperature

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