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IEEE General Meeting Power& Energy Society

作者： Qian Chen Na Qiu Xin Shan Yuqing Jin Lixia Sun Yiping Yu Chuan Qin College of Energy and Electrical Energy Hohai University Nanjing China NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (数字)9781728155081

ISBN: (纸本)9781728155098

In this paper, a novel equivalent model considering the thermal constraint and AGC regulation is proposed for analyzing the frequency of thermal units. The UHVDC converter station blocking is very sensitive to frequency fluctuations in a bulk power system, so an accurate and easy-to-use model is much desired for the operation decision and control design. Firstly, actual output characteristics of the thermal unit are presented. Secondly, the structure of an equivalent frequency model is put forward to describe these characteristics. Thirdly, the scheme of estimating model parameters is offered to ensure to make the responses fit with the measured data. Fourthly, CEPRI-36 system is adopted to verify the proposed model. Finally, simulation precise is manifested by an actual case in East China Power Grid. The proposed model shows significant advantages on high accuracy and clear mechanism. In addition, the main feature of governor and generator is reserved, which is sufficient for analyzing the impacts of system disturbances on the frequency. Considering the increasing installation of UHVDC in power systems, this novel model is extremely beneficial to situational awareness and control decision in operation rooms.

关键词： Automatic generation control Generators Regulation Power grids Data models Thermal analysis Safety

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Study on 24h Dynamic Reactive Power Optimization Considering Safety Operation Limit of Generators

Study on 24h Dynamic Reactive Power Optimization Considering...

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2019 IEEE PES Innovative smart Grid Technologies Asia, ISGT 2019

作者： Lu, Bin Xu, Xi Yu, Zhipeng Wang, Wen Gu, Xuenan NARI Group Corporation State Grid Electric Power Research Institute China NARI Technology Co. Ltd. China State Key Laboratory of Smart Grid Protection and Control China Southeast University Nanjing China

ISBN: (纸本)9781728135205

In order to solve the practical problem of 24-hours dynamic reactive power optimization in power system dispatching, according to the limit output range of generator's operation, this paper divides generator's operation into three regions in PQ mathematical model and takes the action times of discrete control equipment as global inequality constraints, finally establishes a complete 24-hours non-linear mixed integer dynamic reactive power optimization mathematical model. The simulation results show that the mathematical model in this paper can adjust the output of the generators according to the actual situation effectively when the generators are in phase-leading operation. In addition, dynamic reactive power optimization reduces the number of control equipment's action at the cost of increasing active power loss in the whole network. So, In order to ensure the safe and economic operation of power grid, it is necessary to coordinate the relationship between active power loss and the constraints of control equipment's action. This paper has positive reference significance for power system dispatching. © 2019 IEEE.

关键词： Electric power transmission networks

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Energy Storage Planning and Economic Dispatch of Microgrid Considering Power to Gas

Energy Storage Planning and Economic Dispatch of Microgrid C...

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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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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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Novel active arc suppression and protection technology for distribution networks based on LPT injection

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Electric Power Systems Research 2025年 248卷

作者： Hongchun Shu Kaiqing Tian Zhiheng Yang Yue Dai State Key Laboratory of Collaborative Innovation Center for Smart Grid Fault Detection Protection and Control Jointly Kunming University of Science and Technology Kunming 650500 China Faculty of Mechanical and Electrical Engineering Kunming University of Science and Technology Kunming 650500 China Kunming Railway Vocational and Technical College Kunming 650208 China Faculty of Land Resources Engineering Kunming University of Science and Technology Kunming 650500 China

To address the challenges of arc suppression and protection for single line-to-ground (SLG) fault in neutral non-effectively grounded distribution networks (DNs), a novel active arc suppression and protection technology based on Line-Phase Transformation Transformer (LPT) injection is proposed. First, a new LPT is designed to convert the line voltage into an inverse voltage of the fault phase and inject it to the neutral point of the distribution network (DN), utilizing the constant line voltage during SLG. This effectively suppresses the fault-point voltage, ensuring the reliable extinction of the fault arc during SLG. Furthermore, the zero-sequence current (ZSC) characteristics of each feeder are analyzed before and after the LPT disengagement; a fault feeder identification criterion based on the amplitude ratio of ZSC is established, and an active protection technology based on LPT injection is proposed, ensuring accurate and reliable fault-feeder identification. To assess the effectiveness of the method proposed in this article, a typical 10 kV distribution network (DN) simulation model is developed in PSCAD/EMTDC. Simulation results confirm that the proposed technical approach successfully suppresses SLG fault arcs and enables accurate fault-feeder identification, thereby enhancing the safety and reliability of DNs.

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A Security Evaluation of Distribution Networks CPS Considering Information- Physical Combinations Anticipated Failure Screening

A Security Evaluation of Distribution Networks CPS Consideri...

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IEEE Asia Power and Energy Engineering Conference (APEEC)

作者： Ming Ni Manli Li Xia Zhou Zhou Yang NARI Group Corporation (State Grid Electric Power Research Institute) NARI Technology Co. Ltd. State Key Laboratory of Smart Grid Protection and Control Nanjing China Institute of Advanced Technology Nanjing University of Posts and Telecommunication Nanjing China

ISBN: (数字)9781728167824

ISBN: (纸本)9781728167831

With the rapid development of ICT technology and automation control technology, the distribution network has gradually transformed into a distribution network information physical system (distribution network CPS) with highly coupled information systems and physical systems. The information system supports the stable operation of the physical system, and it also brings certain security risks to the distribution network CPS. Therefore, information impact should be considered in the original single physical anticipated fault assessment. This paper proposes a security analysis and evaluation method for distribution network CPS considering information-physical combination anticipated fault screening. Firstly, based on the CPS structure of the distribution network, a CPS correlation matrix model of the distribution network that can reflect the power-information coupling characteristics is established. Then analyze the correlation between information failure and physical failure, and construct an initial information-physical combination anticipated fault set according to topology correlation and service correlation. Then, based on the fault recovery rate ordering, the key information- physical combination anticipated fault is selected. Finally, for the selected combination of anticipated failures, the security assessment of the distribution network CPS security assessment indicators is carried out, and verified in the example.

关键词： distribution network CPS association matrix anticipated failure information-physical combination Power grids Computer based information systems physical fault set faults stability operations

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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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Network Packet Capturing System for Communication Simulation in smart Grid

Network Packet Capturing System for Communication Simulation...

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

作者： Ji, Qianyu Yang, Yibo Zhang, JunJing Yan, Yunsong 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

The next-generation electric power systems (smart grid) are studied to solve the energy crisis. Communication system simulation for the smart grid is of great significance. In this paper, we introduce a simulation system of a real power system. Meanwhile, we established a packet capture system to monitor the situation of the network and tested its performance under different bandwidths. We discussed the reasons that might influence the system’s performance and put forward some proposals for future work. © 2019, Springer Nature Singapore Pte Ltd.

关键词： smart power grids

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Effect of Drive Harmonics on the Loss of High Speed Permanent Magnet Synchronous Machine

Effect of Drive Harmonics on the Loss of High Speed Permanen...

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International Conference on Power Electronics Systems and Applications (ICPESA)

作者： Shaoliang Zhou Min Zhang Jian Shen Bo Wang Xing Zhao Weinong Fu State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation (State Grid Electric Power Research Institute) Co. Ltd Nanjing China School of Electrical Engineering Southeast University Nanjing China The Hong Kong Polytechnic University Hong Kong

ISBN: (数字)9781728188904

ISBN: (纸本)9781728188911

In the design and practical application of high-speed permanent magnet synchronous machine (HSPMSM), there is a multi-parameter, strongly coupled relationship between the machine and the drive. Drive harmonics have a significant impact on machine losses and thus on the overall efficiency. First, a 100kW, 60krpm machine and drive system is modelled accurately to study the strongly coupled electromagnetic field of the motor and drive. The model includes an accurate model of the slot conductor, which facilitates the calculation of AC copper loss. An electromagnetic field-circuit coupling model of the HSPMSM, which enables the study of the high coupling regulation between the machine and the drive. Second, based on the comparison between the ideal sine wave current source and the drive harmonic power supply, the effect of the drive harmonic on various losses of the machine is studied, such as AC copper loss, stator core loss, permanent magnet (PM) and sleeve eddy current loss. The laws and coefficients of the effect of drive harmonics on the various loss of the machine are obtained, which is of great significance for the design and development of HSPMSMs. It provides a useful reference for the design, development and application of HSPMSMs.

关键词： Couplings Stator cores Rotors Power system harmonics Harmonic analysis Copper Eddy currents

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