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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Xue, Yusheng Zhu, Xueqiong Li, Ze NARI Group Corporation State Grid Electric Power Research Institute China State Key Laboratory of Smart Grid Protection and Control Nanjing China School of Electrical Engineering Southeast University Nanjing China

ISBN: (纸本)9781728135205

Study the influence of generator-tripping time on transient stability is of great significance for guiding the setting of the optimal generator-tripping time. Based on the extended equal area criterion (EEAC), the paper points out that the generator-tripping operation affects transient power angle stability margin of the system by changing the equivalent electromagnetic power, the equivalent mapping rotor angle and its corresponding energy accumulation interval, and clarifies accordingly the paths of generator-tripping time affects transient power angle stability margin. For the first swing of angle instability of the Hamiltonian system, the complex influences of generator-tripping time on the control effect are revealed. As generator-tripping time increases, the transient power angle stability margin may present an evolution situation that first increases and then decreases, and reaches a maximum value when generator-tripping time equals to the fault clearing time, and may also present decreases monotonically. The analysis conclusions are verified by simulation experiments. © 2019 IEEE.

关键词： Transients

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Frequency Model of Generator Considering Thermal Constraint and AGC Regulation

Frequency Model of Generator Considering Thermal Constraint ...

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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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Corrigendum to“Research on DC protection Strategy in Multi-Terminal Hybrid HVDC System”[Engineering 7(2021)1064-1075]

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Engineering 2022年第3期8卷 183-183页

作者： Yuping Zheng Jiawei He Bin Li Tonghua Wu Wei Dai Ye Li State Key Laboratory of Smart Grid Protection and Control State Grid Electric Power Research Institute(NARI Group Corporation)Nanjing 211106China Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China College of Energy and Electrical Engineering Hohai UniversityNanjing 210098China

This work was supported by the Headquarter Science and Technology Project of state grid Corporation of China(Research on the transient protection for AC/DC hybrid grid with high-proportion renewable energy,SGAH0000TKJ... 详细信息

关键词： Strategy transient funding

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Leakage Flux-Based Method to Identify the Inrush Current in Transformers

Leakage Flux-Based Method to Identify the Inrush Current in ...

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International Conference on Measuring Technology and Mechatronics Automation, ICMTMA

作者： Zheng Yu-Ping Zhang Zhen-Ya Wu Chong-Hao Pan Shu-Yan Zhou Li State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation(State Grid Electric Power Research Institute)NARI Technology Co. Ltd. Nanjing China

ISBN: (数字)9781728170817

ISBN: (纸本)9781728170824

Inrush current occurrence in the power transformers is an unavoidable event that can happen due to energizing no-load transformer. Although various protection methods based on the terminal current and/or voltage have been proposed for transformer protection, the protection malfunction caused by the inrush current still occurs occasionally. In this paper, By comparing different closing angles of transformers with normal condition and differences in leakage flux near the yoke, a simple and accurate method is presented to identify transformer inrush current conditions. The change of the flux density on the leakage flux sensor can effectively identify the transformer inrush current. This identification method has been initially verified in the simulation in Maxwell.

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Design and implementation of lightweight manmachine terminal screen interactive client 4

Design and implementation of lightweight manmachine terminal...

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4th IEEE Conference on Energy Internet and Energy System Integration, EI2 2020

作者： Lv, Zhimeng Que, Lingyan Fang, Caishen Wang, Xingzhi He, Yuan Huang, Kun NARI Group Corporation State Grid Electric Power Research Institute NARI Technology Co. Ltd. Nanjing China State Grid Zhejiang Electric Power Co. Ltd. No.8 of Huanglong Road Xihu District Hangzhou China East-China Branch of State Grid Co. Ltd. No. 201 Nanjing East Road Huangpu District Shanghai China NARI Group Corporation State Grid Electric Power Research Institute National Key Laboratory of Smart Grid Protection and Operation Control NARI Technology Co. Ltd. Nanjing China

ISBN: (纸本)9781728196060

According to the characteristics of the 'physical distribution and logical integration' of the new generation dispatching automation system, this paper designs a lightweight human-machine terminal display architecture. It also proposes the componentization of the screen and its rendering technology to realize the display of electrical primitives, chart primitives, and non-viewable primitives on lightweight man-machine terminals. Besides, this paper proposes the GIS visual display technology to meet the needs of geographic information display in the dispatch automation system and put forward the interaction technology of picture linkage to improve the interaction flexibility of picture components. Relevant research results have developed prototype system and applied in the field pilot. © 2020 IEEE.

关键词： Automation

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Research on the Structure Optimization of grid Frame Based on Generalized Slow Coherency Clustering

Research on the Structure Optimization of Grid Frame Based o...

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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Weiqiang, Liang Fei, Tang Mengqi, Qing Chufei, Xiao Wen, Jian Mengjiao, Qing Jiale, Liu Feifei, Wang Fusuo, Liu School of Electrical Engineering and Automation Wuhan University Wuhan China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing211006 China

ISBN: (纸本)9781728135205

Considering that the existence of fuzzy nodes will increase the difficulty of clustering when the system splitting occurs, a method is proposed to change the network topology, reduce the number of fuzzy nodes, and optimize the system operation. Firstly, we can obtain the modal matrix of all system nodes based on the generalized eigenvalue analysis. Secondly, Gauss elimination with pivoting is used to construct the slow coherence correlation matrix. Thirdly, the optimal scheme is obtained by continuously modifying the grid structure. It can reduce the number of fuzzy nodes, which is more convenient to maintain the stable operation of the system. Finally, the simulation results of IEEE-118 system show that the proposed method is reasonable and effective. © 2019 IEEE.

关键词： Network topology

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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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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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Research on Coordinated control of Photovoltaic System Based on VSC-HVDC

Research on Coordinated Control of Photovoltaic System Based...

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Power and Electrical Engineering (ACPEE), 5th Asia Conference on

作者： Di Wu Tonghua Wu Xindong Li Hongbin Wu Anhui Provincial Laboratory of Renewable Energy Utilization and Energy Saving Hefei University of Technology Hefei China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing China

ISBN: (数字)9781728152813

ISBN: (纸本)9781728152820

The combination of photovoltaic (PV) power generation and voltage source converter-based high voltage direct current (VSC-HVDC) system is one of the development directions of new energy power generation and its power transmission in the future. Power grid failure or maintenance will lead to power outage. In order to reduce the economic loss caused by this, the PV-VSC-HVDC coordinated control system is used to continuously supply power to loads in island state to maintain its normal operation. By analyzing the mechanism and cause of the islanding effect, a coordinated control strategy suitable to PV-VSC-HVDC system is proposed. Finally, a PV-VSC-HVDC grid-connected system was built based on Matlab/Simulink, and a detailed simulation analysis of the operating characteristics of the system is made. The simulation results show that this control strategy can realize the smooth switch from grid-connected state to island state, ensuring the stable operation of the loads and reducing the economic loss caused by power failure.

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Fundamental Characteristics and Four-tier Residential Customer Energy Consumption Behavior Model

Fundamental Characteristics and Four-tier Residential Custom...

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smart grids and Energy Systems (SGES), International Conference on

作者： Jianmin Zhang Yusheng Xue Fushuan Wen Ping Luo Junteng Luo Yukuan Wang School of Automation Hangzhou Dianzi University Hangzhou China State Key Laboratory on Smart Grid Protection and Control Nanjing China College of Electrical Engineering Zhejiang University Hangzhou China

ISBN: (数字)9781728185507

The big obstacle for residential energy transition is the lack of a consumption behavior model. At first, special characteristics of residential customer are discussed, including their fundamental purpose of energy use and attitudes against constraints and energy prices, as well as derived demand characteristics on appliance in energy consumption, etc. Then, a four-tier energy consumption behavior model of residential customers is developed with “virtual appliance” being generalized into three time scales as current, near future, future, and the behavior evolution process is sectionalized into cognition, consciousness, demand and behavior. The methodology and technology to implement the four-tier model in real applications will be dominated by the emerging cyber physical social system in energy, and a customized questionnaire survey system is demanded to investigate the consumption behaviors of residential customers.

关键词： Economics Energy consumption Home appliances Production Cognition smart grids Object recognition

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