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A New Differential protection Scheme of Distribution Network Line Based on Improved DTW Algorithm and 5G Communication 1

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6th PURPLE MOUNTAIN FORUM on smart grid protection and control, PMF2021

作者： Pu, Hongfei Wu, Tonghua Yao, Gang Hong, Feng Zheng, Xiaojiang Wang, Weiwei Li, Xindong State Key Laboratory of Smart Grid Protection and Control Jiangsu Nanjing211106 China NARI Group Corporation Jiangsu Nanjing211106 China

ISBN: (数字)9789811671562

ISBN: (纸本)9789811671555

With the massive access of new energy, the differential protection will replace the traditional single-ended protection as the main protection of the distribution network line. Among the current differential protection channels, only 5G communication technology has both advantages of performance and price. However, using 5G communication as a communication channel needs to overcome the problems of delay jitter and data packet loss. This article first analyzes the principle of differential protection based on dynamic time warping (DTW) distance algorithm, and uses the nearest previous normal sampling point to replace the current abnormal one to deal with the problem of data packet loss, which is called alternative processing method. Secondly, the main starting criterion based on DTW distance of two-phase current and the auxiliary starting criterion based on DTW distance of the triple zero-sequence current are proposed. Thirdly, the calculation method of DTW algorithm under the short data window is proposed and the two operating criteria based on DTW algorithm are improved. And then, these 4 criteria are combined as a differential protection scheme for distribution network. Both theoretical calculation and simulation analysis show that the proposed scheme can operate well under different types of faults in different locations. With 5G communication delay being ignored, the scheme can operate in only 4–7 ms, and the data window of main operating criterion is only 3.75 ms. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： 5G mobile communication systems

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Research on Hybrid Active Power Filter and Its control and protection System for LCC-HVDC 11

Research on Hybrid Active Power Filter and Its Control and P...

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11th Joint International Information Technology and Artificial Intelligence Conference, ITAIC 2023

作者： Chao, Wujie Dai, Liyu Huang, Junwei Chen, Mingquan State Grid Fujian Electric Power Research Institute Fuzhou350007 China Fujian Key Laboratory of Protection and Operation Control for Smart Grid Fuzhou350007 China

ISBN: (纸本)9798350333664

Filters are key equipment in LCC-HVDC projects. It filters out characteristic harmonics generated by the converter and prevents the effect of harmonics generated by converters on the AC power grid. Currently, most DC transmission projects use passive filters. The first use of hybrid active power filters in the Fujian Guangdong DC interconnection project. This paper introduces the application framework, theory, control and protection system design of hybrid active power filters in LCC-HVDC projects. © 2023 IEEE.

关键词： Characteristic harmonics control and protection Hybrid active power filters LCC-HVDC

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Design and control Method of Power Conversion System for Emergency Power Supply 6

Design and Control Method of Power Conversion System for Eme...

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6th IEEE Information Technology and Mechatronics Engineering Conference, ITOEC 2022

作者： Chen, Jinyu Li, Zhicheng Fan, Yuanliang Li, Chao State Grid Fujian Electric Power Research Institute Fuzhou350007 China Fujian Key Laboratory of Protection and Operation Control for Smart Grid Fuzhou350007 China

ISBN: (纸本)9781665431859

Power conversion system is the key equipment to realize two-way energy transfer between energy storage battery and AC power grid. This paper introduces a design and control method of power conversion system for emergency power supply. The power conversion system can select grid connected operation or independent on load operation to meet the multi scenario application requirements of emergency power supply site. During grid connected operation, the input power is controlled by controlling the input current, and then the output voltage at the DC side is controlled. During independent load operation, the load voltage and frequency are controlled by controlling the output voltage amplitude and frequency of the converter. The proposed constant voltage current limiting control strategy can maintain the DC bus voltage near the reference value and improve the reliability of battery charge and discharge. © 2022 IEEE.

关键词： Electric power supplies to apparatus

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Electric vehicle identification and demand response capability assessment based on non-intrusive monitoring 5

Electric vehicle identification and demand response capabili...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Deng, Jiewen Wang, Jiarui Liu, Yu Wang, Yi Nanjing China Southeast University School of Electrical Engineering Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

The current rapid development and large number of applications of electric vehicles make it necessary to further strengthen the research on the state sensing and demand responsiveness of electric vehicles for residential measurements. Based on the non-intrusive load monitoring technology and deep learning algorithm, the user's power data is processed to obtain the start and end time of possible EV charging behavior, and then the user's power magnitude data and the obtained possible charging start and end time data are used as the input data of BP neural network to identify the EV charging behavior and establish the load sensing model of residential EVs. Based on the load perception model of electric vehicles, we identify the electric load data of residential measurement, obtain the charging status information such as power and electricity of electric vehicles of users, and use the status information as the data base to evaluate the demand response capability of residential measurement electric vehicles. Finally, the simulation modeling of the above method shows that the method can identify the charging status of electric vehicles more accurately and effectively evaluate the ability of residential measurement electric vehicles to participate in demand response. © 2022 IEEE.

关键词： Electric vehicles

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Analysis of the Status and the Prospects of Pilot protection in Distribution Network Based on 5G Communication 1

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6th PURPLE MOUNTAIN FORUM on smart grid protection and control, PMF2021

ISBN: (数字)9789811671562

ISBN: (纸本)9789811671555

With the massive access of new energy resources, distribution network urgently needs to popularize the principle of pilot protection. As a suitable data transmission channel at present, 5G communication technology still has the problem of time delay and its jitter, which also directly affects the data synchronization method of pilot protection. On the basis of analyzing the composition of 5G time delay and reasons for its jitter, this paper first summarizes the current methods to alleviate this problem and proposes a new solution to deal with it, namely regional ad hoc network technology based on 5G CPEs. Secondly, after elaborating the advantages and disadvantages of data synchronization and self-synchronization technology based on 5G communication, in order to cooperate with regional ad hoc network technology based on 5G CPEs, the improved ping-pong time synchronization method is proposed. Thirdly, the principle of pilot protection based on waveform similarity is explained in detail, which has good performance of anti-synchronization error and anti-data packet loss. And then, the data transmission security and 5G data traffic problem are analyzed. Finally, the overall communication strategy of the regional distribution network based on 5G communication is proposed, and several suggestions for the development of the pilot protection of distribution network based on 5G are proposed. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Time delay

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A Fault Ranging Method Applicable for the Four-Terminal Lines 7th

A Fault Ranging Method Applicable for the Four-Terminal Line...

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7th Purple Mountain Forum on smart grid protection and control, PMF2022

作者： Yu, Hong Sun, Liangkai Wu, Tonghua Wang, Xiaohong Yang, Pingyi Jiang, Yuan NARI Group Corporation Jiangsu Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Jiangsu Nanjing211106 China

ISBN: (纸本)9789819900626

With the rapid development of new energy resources and the economic consideration for the construction of the grid, the four-terminal and above lines are being used more and more, but subject to technical and other conditions, the fault ranging of the current multi-terminal line is mostly single-terminal ranging achieved by distance protection, which has large errors when a single-phase ground fault occurs via transition resistance. In this paper, a double-terminal data ranging method is introduced for multi-terminal line faults based on the combined sequence component. First, the fault section selection is performed by the combined sequence component bucking voltage algorithm. Then the fault ranging is performed based on the fault section selection results with the analog information collected at the first end of the faulty branch and the virtual analog information at the nearest T-point of the branch. After theoretical analysis and RTDS simulation experiments, it is verified that the above fault ranging methods can accurately range the multi-terminal line faults under various conditions of line faults. © state grid Electric Power Research Institute 2023.

关键词： Energy resources

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Risk Assessment of Cyber Physical Power System considering Attack Model 5

Risk Assessment of Cyber Physical Power System considering A...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Li, Manli Xu, Haibo Xu, Jianbing Ding, Zhao Liu, Qitao Yin, Zhaoyang Nari Group Corporation State Grid Electric Power Research Institute State Key Laboratory of Smart Grid Protection and Control School of Electrical of Engineering Southeast University Nanjing China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

The close coupling between cyber and physics makes malicious attacks seriously affect the security of power system. Firstly, this paper analyzes the possible attack scenarios, establishes the attack graph model, and proposes the calculation method of the attack probability. On this basis, combined with the security and stability control business, the impact on the power primary system is analyzed, and the risk assessment method of malicious attack is proposed. Finally, an example illustrates the improvement of cyber - physical analysis, and proves that cyber - physical analysis technology has a good application prospect. © 2022 IEEE.

关键词： Risk assessment

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Overview of DC transmission line fault analytical methods and single-ended protection 4

Overview of DC transmission line fault analytical methods an...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Pu, Hongfei Li, Xindong Wu, Tonghua Yao, Gang Nari Group Corporation State Grid Electric Power Research Institute Nanjing China Nari Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (纸本)9781728171494

DC transmission technology, which plays an important role in connecting AC grids, can transmit power asynchronously under long-distance and large-capacity conditions. protection devices and control system of the DC transmission system are quickly put into use after the information of the first traveling wave caused by faults of DC lines having been detected. Therefore, the current HVDC transmission line mainly adopts single-ended protection based on first traveling wave information as main protection for DC lines and such protection is not affected by the control strategy. But in the fault transient stage, changes of electrical quantities of DC transmission lines will show nonlinear characteristics because of the control strategy. At present, the analytical method of fault characteristics in the transient stage is not perfect and the rapid coordination of control and protection has not been realized. This paper presents an overall introduction to the research statuses of fault analytical methods and single-ended protection principles of DC transmission lines. First, the fault characteristics of LCC- based DC transmission lines and VSC-based DC transmission lines are compared. Second, the current research statuses of HVDC transmission line analytical models and fault transient analytical methods are analyzed and the shortcomings of current analytical methods are listed. Third, the current single-ended protection principles of DC transmission lines are classified, and then the problems and valuable research directions in the process of studying single-ended protection principles based on the coordination of control and protection are listed. Finally, the outlook for the rapid coordination of control and protection of DC transmission lines is determined. © 2021 IEEE.

关键词： HVDC power transmission

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Design and fabrication of bipolar plates for PEM water electrolyser

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Journal of Materials Science & Technology 2023年第15期146卷 19-41页

作者： Xiejing Luo Chenhao Ren Jie Song Hong Luo Kui Xiao Dawei Zhang Junjie Hao Zhanfeng Deng Chaofang Dong Xiaogang Li Beijing Advanced Innovation Center for Materials Genome Engineering Key Laboratory for Corrosion and Protection(MOE)Beijing 100083China Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co.Ltd.Beijing 102209China

Hydrogen energy,whether in generation plants or utilization facilities,plays a decisive role in the mission to achieve net-zero greenhouse gas emissions,all to minimize *** growing demand for clean energy carrier steadily accelerates the development of hydrogen production processes,and therein proton exchange membrane(PEM)water electrolysis is deemed a promising long-term strategy for hydrogen preparation and *** review retrospects recent developments and applications of bipolar plates(BPs)as key components in PEM fuel cells and water *** main content includes multifaceted challenges in the R&D or fabrication of BPs and potential future trends have also been *** details cover the BPs matrix(metallic materials and carbon composites)and the surface coating types(metal and compound coatings,carbon-based coatings,and polymer coatings),as well as the influence of flow field design for mass ***-term development and feasible researches of BPs are *** in the following aspects:(1)Structural and functional integration of components,such as material fabrication and flow field geometry optimization using 3D printing technology;(2)Introduction of environment-friendly renewable energy for hydrogen production;(3)Research on hydrogen energy reversible systems;(4)Composition optimization of surface coatings based on computational materials science and(5)systematic design expected to evolve into the next generation of BPs.

关键词： PEM water electrolyser Bipolar plates Corrosion Coatings Interfacial contact resistance

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Research and Application of Trans-Regional Cooperative Disposal of UHV Interconnected Power grid 3

Research and Application of Trans-Regional Cooperative Dispo...

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2017 3rd IEEE International Conference on control Science and Systems Engineering (ICCSSE)

作者： Shan Xin Jiang Yefeng Wu Li Jin Yiding Wang Yiyu Lu Jinjun NARI Group Corporation NARI Technology Co.Ltd State Key Laboratory of Smart Gird Protection and Control Jiangsu Electric Power Company of State Grid of China National Electric Power Dispatching and Control Center State Grid Corporation of China

ISBN: (纸本)9781538604854

With the rapid construction of UHV AC/DC power grid, the integration characteristics of power grid are becoming more and more prominent, and real-time operation control of dispatching is significantly becoming more and more difficult. The existing monitoring and control model based on the system model data cannot meet the requirements for the development of UHV power grid. Based on the existing achievements of dispatching automation system, the general goal and framework of the trans-regional cooperative disposal of UHV interconnected power grid are put forward, and the key technologies are analyzed in four aspects: situation awareness, fault location, joint disposal and cooperative control to provide reference and example for follow-up construction for real-time control and support system for the dispatching of UHV power grid.

关键词： UHV situation awareness cooperative disposal source grid load wide area graphic browsing DC fault diagnosis

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