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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Dongbao Lv Shanshan Qiu Yujun Zhou Changgang Li Junjun Yang Wei Xu Xing Lei Changhui Ma Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China NARI Group Corporation State Grid Electric Power Research Institute Nanjing China State Grid Shanghai Municipal Electric Power Company Shanghai China Shandong Smart Grid Technology Innovation Center State Grid Shandong Electric Power Company Electric Power Science Research Institute Jinan China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

With the rapid development of renewable generation, the evolution process of fast cascading failures in the power system with a high proportion of renewable generation turns out to be more complicated. There are few existing fast cascading failure models that take into account the voltage ride through (VRT) capability of renewable generation. The portrayal of the dynamic characteristics of renewable generation still needs to be improved. In response to this, the VRT control model and VRT protection model have been established to comprehensively depict the output characteristics and disturbance tolerance capability of renewable generation in fast cascading failures. Finally, the simulation results of the AC-DC hybrid receiving-end system with a high proportion of renewable generation show that the established models can effectively depict the influence of VRT capability of renewable generation in fast cascading failures, providing a more comprehensive basis for the analysis of fast cascading failures under the access of a high proportion of renewable generation.

关键词： Renewable energy sources Voltage fluctuations Simulation Power system protection Power system dynamics System integration Delays Power system faults Voltage control Transient analysis

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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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Current Compensation-Based Transient Stability Enhancement for an Islanded Microgrid

Current Compensation-Based Transient Stability Enhancement f...

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Power System and Green Energy Conference (PSGEC)

作者： Yawen Ding Fei Gao Kai Hou Yingwei Jiang Xu Zhong Hang Yin Key Laboratory of Control of Power Transmission and Conversion Ministry of Education College of Smart Energy Shanghai Jiao Tong University Shanghai China Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Dept. of Electrical Engineering Shanghai Jiao Tong University Shanghai China NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China

ISBN: (数字)9798350365573

ISBN: (纸本)9798350365580

With the increasing incorporation of renewable energy via power electronic converters, islanded microgrids are susceptible to transient instability when faced with large disturbances, attributed to converters’ low inertia and high nonlinearity. This paper introduces a current compensation-based control strategy to enhance transient stability of an islanded MG. By incorporating frequency deviation between grid-following converter and grid-forming converter into current controller of grid-following converter, the balance between the system’s equivalent input and output torques can be accelerated. Compared with previous stability-enhanced method, the proposed strategy demonstrates superior performance in the aspect of small overshoot and fast convergence. Simulation results validate the analysis and effectiveness of this strategy.

关键词： Simulation grid following Microgrids Power system stability Stability analysis Power electronics Transient analysis Frequency control Power generation grid forming

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Transient Stability Analysis and Enhancement of an Islanded Microgrid with grid-forming Converters and grid-following Converters

Transient Stability Analysis and Enhancement of an Islanded ...

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Power System and Green Energy Conference (PSGEC)

作者： Yawen Ding Fei Gao Kai Hou Yingwei Jiang Xu Zhong Hang Yin Key Laboratory of Control of Power Transmission and Conversion Ministry of Education College of Smart Energy Shanghai Jiao Tong University Shanghai China Dept. of Electrical Engineering Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China

ISBN: (数字)9798350365573

ISBN: (纸本)9798350365580

The rising integration of renewable energy through power electronic converters has heightened the susceptibility of islanded microgrids to transient instability under large disturbances, primarily due to the converters’ low inertia and high nonlinearity. For an islanded microgrid with multiple converters, this paper estimates its transient stability based on Takagi-Sugeno method and introduces a phase compensation-based control strategy to enhance its transient stability. By incorporating angle difference between grid-following converter and grid-forming converter into current controller of grid-following converter, the balance between the system’s equivalent input and output torques can be accelerated. Simulation results validate the analysis and effectiveness of this strategy.

关键词： grid following Simulation Microgrids Power system stability Stability analysis Power electronics Takagi-Sugeno model Transient analysis Power generation grid forming

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Identification Methods for Transformer Turn-to-Turn Faults and Inrush Current Based on Electrical Information

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Journal of Physics: Conference Series 2022年第1期2215卷

作者： Xinyi Gong Yuping Zheng Shuyan Pan Chonghao Wu Jinzhao Deng NARI Research Institute NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China State Key Laboratory of Smart Grid Protection and Control

Power transformer is the most imperative and crucial equipment in electrical power system. Accurately monitoring the occurrence of transformer faults and rapidly isolating the faults are of great significance to ensure the reliability of power supply and avoid serious damage to the transformer. There are many methods used in the transformer to monitor transformer running state. This paper provides a comprehensive overview of transformer turn-to-turn fault and inrush current identification methods based on electrical information, and expounds the systematic research content that needs to be carried out for transformer turn-to-turn fault identification methods based on magnetic flux leakage information.

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Clustering of Photovoltaic Power Stations Based on the Improved AP Clustering Algorithm

Clustering of Photovoltaic Power Stations Based on the Impro...

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Annual Conference of Industrial Electronics Society

作者： Yawen Ding Fei Gao Yingwei Jiang Kai Hou Donghui Zhang Xuewei Shi Key Laboratory of Control of Power Transmission and Conversion Ministry of Education College of Smart Energy Shanghai Jiao Tong University Shanghai China Dept. of Electrical Engineering Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China State Grid Jibei Zhangjiakou Wind and Solar Energy Storage and Transportation New Energy Co. Ltd Zhangjiakou China

To deal with the problem that uncertain parameter in Affinity Propagation (AP) clustering algorithm affects the clustering results, this paper proposes a clustering method based on AP clustering algorithm and Genetic Algorithm (GA) for Photovoltaic (PV) power stations. Firstly, the modeling of PV power stations is established and clustering index are determined according to the dynamic characteristics of PV power stations. Then the proposed method takes the silhouette index, which is used to evaluate the quality of the clustering result, as the fitness function of GA. The bias parameter placed on the main diagonal of the similarity matrix in the AP clustering algorithm is constantly iterated and updated until obtaining the optimization result. Finally, the studied case verifies the better clustering performance of the proposed method. The 20 PV power stations in the Taoling Substation can be simplified into three groups, reducing the complexity and calculation time for equivalent modeling.

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Distributed transmission technology of node status in distribution network

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Journal of Physics: Conference Series 2021年第1期1920卷

作者： Kuo Tan Hai Wu Guo Hu Hui Chen NARI Technology Co. Ltd. Nanjing 211000 NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing 211000 State Key Laboratory of Smart Grid Protection and Control Nanjing 211000)

With the rapid development of distribution network automation and the construction of DC distribution network and AC / DC hybrid distribution network, the network operation mode is more flexible. If the distribution network wants to realize rapid load transfer, such as the connection of power supply, upstream and downstream fault isolation signals and other node states need to be quickly identified. At present, the node status identification of distribution automation is basically completed by the master station. However, the master station has poor real-time transmission of status information, which is generally in seconds or minutes, and can not meet the demand of real-time load transfer. In this paper, a distributed real-time transmission method of AC and DC distribution network node status is constructed for distribution automation system. Based on IEC61850 goose communication protocol, the real-time transmission of node status is realized in distribution automation terminal. In this method, the positive direction of each tie switch is defined, which is independent of power flow direction, and the tie switch is distinguished along the user-defined positive direction When multiple tie switches have the same upstream node, they are each other's t nodes. Each tie switch needs to be equipped with a distribution automation terminal with goose communication capability. According to different control strategies, the distribution automation terminal can realize millisecond level node state transmission step by step. Node state can be divided into unconditional transmission state and conditional transmission state. The distributed real-time transmission technology of distribution network node state proposed in this paper has been successfully applied to Tongli integrated energy service The center and Suzhou medium and low voltage DC project lay the foundation for the realization of loop closing, loop breaking control, fast fault isolation and power transfer control strat

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Status evaluation of smart substation measurement and control device

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IOP Conference Series: Materials Science and Engineering 2019年第4期563卷

作者： Zhang Min Shen Jian Chen Li Zhou Bin Zhou Shao Liang Hou Zhe NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China NARI Technology Corporation Co. Ltd Nanjing China

In power system, measurement and control device plays an important role in maintaining an ideal level of reliability. Therefore, the reliability of the measurement and control device should be evaluated to fully understand the cause of its failure. A new evaluation model is proposed, which relates the fault of measurement and control system with the four main reasons of device hardware fault, software fault, auxiliary equipment fault and human fault. In addition, the model can also comprehensively consider other aspects of the measurement and control system, such as human error in testing and software upgrade, effectiveness of daily operation monitoring, degree of dependence on self-inspection, local backup and misoperation. These studies have a lot of significance to the reliability of the control system, and also can effectively improve the stability of the system.

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Research on the Differential protection of the SFC Output Transformer for Pumped Storage Hydro Unit

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Journal of Physics: Conference Series 2021年第1期2005卷

作者： Feng Long Luofei Wan Shuyan Pan Xiaobao Liu Zhonglang Wang Ruichen Zhao State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing Jiangsu NARI Technology Co. Ltd. Nanjing Jiangsu 211106 China

Pumped storage power stations play an great role in promoting new energy consumption, ensuring the safety of power grid, building clean, low-carbon, safe and efficient energy system, and has a broad development prospect. SFC is the most important start-up mode of pumped storage unit, and the output transformer is an important equipment of SFC system, which needs to be equipped with reliable and fast differential protection to ensure its safe and reliable operation. The current frequency varies from 0 to 50Hz during SFC start-up, so the conventional transformer differential protection can not adapt. In this paper, the output transformer differential protection technology is studied according to the electrical characteristics and short circuit fault characteristics of SFC start-up process, the high precision frequency algorithm and the RMS integration algorithm with compensation are proposed to realize the precise measurement of frequency and amplitude, and the ultra-low frequency CT saturation identification technology is proposed to realize the whole process protection of the output transformer from start-up to grid-connection.

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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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