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IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

作者： Jiaqi Gu Fei Mei Jixiang Lu Jinjun Lu Bo Yang College of Energy and Electrical Enginering Hohai University Nanjing China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing China China Electric Power Research Institute Nanjing China

ISBN: (数字)9781728157481

ISBN: (纸本)9781728157498

New energy has been vigorously promoted for its advantages such as cleanliness, large reserves and renewability. Recently, power-to-gas (P2G) technology has provided a new idea for energy conversion, which helps to improve energy efficiency. In view of the current high penetration rate of photovoltaics, the impact of three measures with regard to energy conversion, energy storage configuration and demandside response on the economics of the microgrid and the optimal scheduling of the microgrid are explored. Firstly, a microgrid scheduling model with P2G device is built; Secondly, a bi-level planning model for the economic cost of the microgrid scheduling is presented. The upper layer will be based on absolutely accommodation of photovoltaics as the prerequisite to conFigure the optimal energy storage capacity; Then lower layer performs optimized scheduling under the upper model to ensure the economy of the microgrid. Finally, a comparison example is used to analyze the optimal energy storage capacity in different scenarios and an optimized scheduling scheme is given.

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Large generator rotor distortion sensing monitoring technology research

Large generator rotor distortion sensing monitoring technolo...

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Electrical Engineering and Automation (IFEEA), International Forum on

作者： Zhou Shaoliang Chen Li Shen Jian Sun Jianping State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation (State Grid Electric Power Research Institute) Co. Ltd Nanjing China NARI Group Corporation (State Grid Electric Power Research Institute) Co. Ltd NARI Technology Corporation Co. Ltd Nanjing China

ISBN: (数字)9781728196275

ISBN: (纸本)9781728196282

In view of the shortage of direct measurement method for shafting of large generator sets, this paper proposes a sensor monitoring technology based on illumination emphasis. The article first introduces the research status of the shaft torque of thermal power units, and expounds the theory of mode interference and the theory of twist sensing. Then, the LP mode simulation of single-mode fiber and two-mode fiber is carried out, which is an effective method for symmetrical higher-order mode. Finally, the simulation of the mode interferometer, the spectrum and the phase during twisting is carried out. It is clarified that the non-circular symmetrical mode with π phase difference electric field distribution is the key inducement of the interferometric phase jump and spectrum flipping in twisting measurement. This article provides theoretical guidance for subsequent device fabrication and spectral distortion analysis.

关键词： Optical fiber sensors Optical interferometry Phase measurement Perturbation methods Optical distortion Distortion Optical fiber theory

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A Fast Blocking Method of Bus protection when CT Disconnected Based on Braking Current and Zero Sequence Current

A Fast Blocking Method of Bus Protection when CT Disconnecte...

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Sustainable Power and Energy Conference (iSPEC)

作者： Yincheng Wang Jie Zhu Wei Dai Xiang Zhu Xiaohong Wang Kaiyu Zhang NARI Technology Co. Ltd NARI Group Corporation Nanjing China Maintenance company of State Grid Tibet Electric Power Co. Ltd State Grid Tibet Electric Power Company Lhasa China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

Current transformer (CT) disconnection of bus is prone to maloperation of bus differential protection. The existing criteria for CT disconnection do not fully consider the distinction between heavy load high impedance fault and external metal fault transfer to internal high impedance fault. And not fully consider the influence of one-half wiring circulation and unbalanced impedance on CT disconnection zero sequence criterion. Based on the theoretical analysis of the characteristics of braking current variation and zero sequence current distribution in the event of internal fault, this paper puts forward a fast blocking criterion of CT disconnection based on braking current and zero sequence current, and carries out simulation verification. Both the theory and the simulation show that there is a drop of braking current in the event of internal fault. The distribution of zero sequence current in the event of CT disconnection is obviously different from that in the event of internal fault. The criterion proposed in this paper can effectively and reliably distinguish CT disconnection from internal fault.

关键词： Wiring Analytical models Current transformers Reliability theory Current distribution Impedance Load modeling

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Research and Demonstration Application of On-line monitoring and evaluation technology for primary frequency regulation in Renewable Energy Power Station

Research and Demonstration Application of On-line monitoring...

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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Liu, Dong Wang, Bo Shan, Xin Lu, TingXiang Ling, XiaoBo Tan, ZhenNing Zhu, JingKai Huang, Sheng Wang, ZhiHua NARI Group Corporation State Grid Electric Power Research Institute Nanjing211106 China NARI Technology Co. Ltd. Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China State Grid Shanghai Municipal Electric Power Company Shanghai200010 China

ISBN: (纸本)9781728135205

When the renewable energy power station is included, the primary frequency regulation(PFR) of the grid can make a big difference. New control methods are proposed to accommodate this *** this case,we propose an on-line monitoring and evaluation method which based on PMU dynamic data for PFR of renewable energy power station. Firstly, the characteristics of the PFR of the renewable energy power station are expounded. Secondly, quantitative evaluation indicators of PFR are proposed. Finally, the concrete implementation method and an application example are introduced. The method has been applied in practice and has obtained good application results. © 2019 IEEE.

关键词： Phasor measurement units

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Analysis and Testing of U.S.-China key Technology for Charging Interoperability of Electric Vehicles

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IOP Conference Series: Earth and Environmental Science 2021年第1期701卷

作者： X Zhang J Cui W Zhang J D Ye X L Li NARI Group Corporation/State Grid Electric Power Research Institute Nanjing 211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing Nanjing 211106 China

At present, China has overtaken the United states to become the world's largest new energy vehicle market. Due to differences in developmental trajectory, developmental mode, and charging standards, China and the U.S. have common interests and the foundation for cooperation, which can work together for a win-win development. Charging interoperability is the basis for ensuring charging safety and interchangeability of electric vehicles. This study examined and compared the differences between China and the U.S. in the standards for conductive AC charging of electric vehicles. The requirements for a control pilot circuit, proximity circuit, current capacity, and charging-state transition timing were analysed. Hierarchical and layered interoperability test cases based on GB/T 34657 and SAE J2953 series were presented. A dual interface interoperability test system was constructed and used to verify the test method rationale. The results provided a mutual inspection solution for AC charging equipment between China and the U.S. and accelerated global application and promotion of the electric vehicle industry.

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A Deep Learning Based Real-time Load Forecasting Method in Electricity Spot Market

A Deep Learning Based Real-time Load Forecasting Method in E...

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2018计算机科学与工程技术国际研讨会

作者： Qipei Zhang Jixiang Lu Zhihong Yang Mengfu Tu Nari technology co ltd. State Key Laboratory of Intelligent power grid protection and operation control

This paper analyzes the potential influence in Chinese electricity market due to the reform and access of the electricity spot market. On this occasion, a deep learning based model for load forecasting is proposed to improve the market operator's precise scheduling level and assist power retailers in managing bid strategies. LongShort Term Memory(LSTM) unit is used to modeling, which is one of the most popular techniques of deep learning. In addition, historical power load data and meteorological data of Suzhou and Lianyungang in China from January 2015 to December 2017 are used for the study to training and evaluate forecasting model. As a result, this paper shows the compare results with exiting machine algorithm for load forecasting.

关键词： A Deep Learning Based Real-time Load Forecasting Method in Electricity Spot Market

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Distribution network protection method based on Hankel singular value decomposition and transient energy

Distribution network protection method based on Hankel singu...

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Intelligent Design (ICID), International Conference on

作者： Wei Long Shuyan Pan Tonghua Wu Wei Dai Dan Wu Kuncheng Zheng School of Electrical and Automation Engineering Nanjing Normal University Nanjing Jiangsu China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing Jiangsu China Nari Group Corporation Nanjing Jiangsu China

As a new technology, 5G technology has a lower cost than optical fiber and a transmission speed and carrying capacity comparable to optical fiber. It can improve the performance of the distribution network communication system, and it also enables differential protection based on double-ended data coordination. The protection has a new life. The factors affecting the reliability of differential protection are mainly divided into the accuracy of the synchronization algorithm and the reliability of the protection algorithm. Starting from these two aspects, this paper uses the Hankel matrix singular value decomposition to achieve the synchronization of the double-ended fault time; and designs a method based on transient differential energy, which is consistent with the judgment by judging the continuous sampling points in the sliding time window. The number of data sampling points constitutes the condition of protection action. The proposed method can reliably act on short-circuit faults, ground faults and high-resistance faults that occur in the area, and will not malfunction for out-of-area faults, regardless of the type of fault, transition resistance and other factors. Finally, PSCAD/MATLAB is used to verify the feasibility of the proposed method.

关键词： Resistance Grounding 5G mobile communication Design methodology Distribution networks Synchronization Reliability

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Best practices in China Southern Power grid competition of AI short-term load forecasting

Best practices in China Southern Power Grid competition of A...

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IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

作者： Jixiang Lu Junxia Qian Qipei Zhang Shaobo Liu Feng Xie Hongsheng Xu State Key Laboratory of Smart Power Grid Protection and Control Nanjing China Jiangsu Keneng Electric Power Engineering Consultant Co. Ltd Nanjing China Technology Research Center NARI Group Corporation Nanjing China

ISBN: (数字)9781728157481

ISBN: (纸本)9781728157498

China Southern Power grid (CSG) hosted a competition of AI short-term load forecasting with real-world load data in Sept 2019. NARI Technology was invited for the 10 days closed match and got the 2 nd prize among 28 top players in China, such as research institutes, universities, and system suppliers. This paper highlights the best practices we did in the competition: feature selection of short-term load forecasting, outlier data preprocessing for both load data and meteorological data, multiple head long short term memory (LSTM) neural network innovation and data augmentation with the benchmark. opportunities for improvements are considered as well.

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Reactive Power and Voltage Coordinated control of Wind Farm for Parallel Running STATCOM

Reactive Power and Voltage Coordinated Control of Wind Farm ...

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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Xu, Lufei Chen, Tianhua Yang, Luo Chen, Jianhua Du, Lei Zhong, Hailiang NARI Group Corporation State Grid Electric Power Research Institute Nanjing211106 China NARI Technology Co. Ltd. Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China State Grid Ningxia Electric Power Co. Ltd. Yinchuan750001 China

ISBN: (纸本)9781728135205

To solve the reactive power and voltage coordinated control of parallel running static synchronous compensator (STATCOM) in wind farm, a reactive power and voltage coordinated control strategy is proposed based on the united control mode of voltage control and reactive power control. The strategy makes full use of the control characteristics of STATCOM fast regulation and stable voltage, the voltage of the point of common coupling (PCC) connect with power system is quickly adjusted, and optimize the dynamic reactive power which reserve in wind farm. Finally, the wind farm in china wind power cluster area is taken as an example for practical application, the practical application results verify the correctness and effectiveness of the proposed control strategy. © 2019 IEEE.

关键词： Voltage control

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Improving Convergence of IEEE 1588v2 Protocol Using Clock Servo System

Improving Convergence of IEEE 1588v2 Protocol Using Clock Se...

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International Conference on Communications, Signal Processing, and Systems, CSPS 2018

作者： Gu, Weiwen Yu, Yue Tong, Heqin Gao, Qin Zhang, Zhijian Wang, Jian School of Electronic Science and Engineering Nanjing University 163 Xianlin Road NanjingJiangsu210023 China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation 19 Chengxin Road NanjingJiangsu211000 China

ISBN: (纸本)9789811362637

Precise time synchronization is widely used in several domains such as Internet of Things (IoT), communication industry, power system and so on. Among all-time synchronization protocols, IEEE 1588v2 Protocol has received extensive attention, due to its submicrosecond accuracy and high-cost performance. However, it is not great enough in the convergence performance of synchronization in software-only system. Therefore, the aim of this paper is to speed up the convergence by control the jitter in software-only system. There are several methods proposed to reduce the jitter brought by soft timestamp and nonreal-time operating system. We compare and analyze various methods and choose clock servo system to experiment. The results of experiments verify that the clock servo system reduces the convergence time and improves the synchronization accuracy to some extent. © 2019, Springer Nature Singapore Pte Ltd.

关键词： Jitter

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