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Vertically integrated outdoor in-site line protection based on SoC technique

Global Energy Interconnection 2018年第2期1卷 179-186页

作者： Tonghua Wu Yuping Zheng Yutao Qiu Xiaoping Zhang Gang Yao Jimin Chai Xiaofan Hou College of Energy and Electrical Engineering Hehai University NARI Group Corporation/State Grid Electric Power Research Institute State Key Laboratory of Smart Grid Protection and Control State Grid Zhejiang Electric Power Corporation Electrical and System Engineering University of Birmingham

By focusing on the problems of speed, reliability, operation and maintenance in the practical application of line protection in conventional and smart substations, we propose system architecture and a technical scheme for in-site(similar in meaning to on-site or near-process) line protection based on vertical integration and outdoor installation. The functions of the single-bay merging unit, relay protection, and intelligent terminal are vertically integrated to reduce the number and types of devices, simplify the configuration, reduce signal transmission, and shorten the protection action time. In addition, this vertically integrated device is applied to provide data acquisition and control execution support for substation-area protection, security and stability of devices, and other substation-area devices. The vital performance outputs are tested and compared. Finally, the experimental results verify that the proposed scheme is feasible and the technology is advanced.

关键词： Line protection In-site relay protection Merging unit Vertical integration

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Modified distance backup protection fused with DC control information 7

Modified distance backup protection fused with DC control in...

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7th Asia Conference on Power and Electrical Engineering, ACPEE 2022

作者： Gongye, Lingjiao Zhang, Dahai Li, Wei Wang, Xueqin Wu, Chuanjian Beijing Jiaotong University School of Electrical Engineering Beijing China Skl of Sgpc Nari Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (纸本)9781665418195

The removal of the DC line may lead to power flow transfer, which leads to the wrong operation of the AC line distance III protection. To solve this problem, a modified distance backup protection that integrates DC control information is proposed. First, analyze the characteristics of DC side control information and propose a power flow transfer identification scheme that integrates DC control information. Subsequently, the modified distance backup protection is constructed using the identification results of the power flow transfer. Finally, an AC/DC hybrid model was established to verify the feasibility and fault resistance capability of the proposed scheme. © 2022 IEEE.

关键词： Electric load flow

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Power Flow Optimization of Intelligent Distribution Network with Distributed Energy Resources

Power Flow Optimization of Intelligent Distribution Network ...

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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Gu, Xuenan Xu, Xi Yu, Zhipeng Huang, Sujuan Lu, Bin NARI Group Corporation State Grid Electric Power Research Institute Nanjing China State Key Laboratory of Smart Protection and Control China Southeast University Nanjing China

ISBN: (纸本)9781728135205

With the increasing penetration of distributed energy resources in distribution network, it is necessary to strengthen the research on optimal power flow control of intelligent distribution network. Aiming at the characteristics of distributed energy resources decentralized access in intelligent distribution network, a zonal collaborative control structure of intelligent distribution network based on multi-agent system (MAS) theory is designed. An optimal power flow model of the intelligent distribution network is established, which aims at minimizing the cost of power consumers, voltage deviation and power losses. The intelligent single particle algorithm is used to optimize power flow in the intelligent distribution network. The distribution system of the intelligent distribution network laboratory is analyzed to verify the effectiveness of the model and the algorithm. © 2019 IEEE.

关键词： Multi agent systems

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Regulation performance of virtual synchronous generator applied in renewable energy system

Regulation performance of virtual synchronous generator appl...

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2021 International Conference on Information Technology and Intelligent control, CITIC 2021

作者： Qi, WeiZhi Zha, Daojun Wu, Tonghua Dai, Wei Li, Xindong Hou, Xiaofan State Grid Jiangsu Electric Power Co. Ltd. Nanjing210024 China State Key Laboratory of Smart Grid Protection and Control Nanjing Nanjing 211106 China Nanjing211106 China

The conventional synchronous generator (SG) can regulate the active and reactive power for frequency and voltage stability, when the system fluctuates. In renewable energy generation system (RES), the stability problem of RES can be solved by adding virtual inertia and damping in the control strategy of the grid-connected inverter. The grid-connected inverter and renewable energy system with this kind of control strategy, called as virtual synchronous generator (VSG), acts as a synchronous generator. In this paper, the topology of grid-connected PV array and energy storage system is proposed. The VSG used in grid-connected inverter, is modelled as stator and rotor model by stator voltage equation and rotor motion equation, respectively. Meanwhile, the VSG control mechanism, based on droop control and model of VSG, can be divided as active power-frequency and reactive power-voltage control. Besides, the system stability is analyzed based on small signal model, for the design of inertia and damping. The simulation model is designed by MATLAB/Simulink for the implementation of VSG. In simulation, it is compared that the dynamic regulation performance of VSG with different control coefficient, such as virtual inertia, virtual damping, droop coefficient and integral coefficient. The optimization for regulation performance in simulation provides an appropriate selection method of the control coefficient for VSG. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Synchronous generators

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Correction of Wind Power Prediction Error Under the Extreme Weather Based on K-nearest Neighbor Algorithm 1

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8th Purple Mountain Forum on smart grid protection and control, PMF 2023

作者： Ye, Wenjie Liu, Gang Yang, Dongmei Liang, Yiheng Yang, Yize Tang, Chenghong Chen, Yizhi State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China Nanjing211106 China NARI Technology Development Co. Ltd Nanjing211106 China

ISBN: (数字)9789819992515

ISBN: (纸本)9789819992508

Extreme weather, such as cold waves and frosts, can significantly impact the output of wind farms. To address this issue, this paper proposes a short-term power prediction and correction method suitable for wind farms during extreme weather, based on the K-nearest neighbor algorithm and multiple linear regression model. By verifying that wind power output is affected by wind speed, temperature, humidity, wind power kurtosis, and other factors, the K-nearest neighbor algorithm is used to obtain the sample set of similar days on the day to be measured. The regression model of influencing factors and output errors is established to improve the power prediction accuracy. A wind farm in northwest China is used as a test example to verify the effectiveness of the output correction method. © 2024, State grid Electric Power.

关键词： Nearest neighbor search

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A Dual-Objective Optimization control Strategy with Markov Forecast for Battery Energy Storage System to Mitigating Wind Farm Fluctuations 6th

A Dual-Objective Optimization Control Strategy with Markov F...

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

作者： Gu, Haotian Hou, Kai Jiang, Yingwei Yin, Hang Liu, Jing Zhong, Xu NARI Group Corporation/State Grid Electric Power Research Institute Jiangsu Province Nanjing211000 China State Key Laboratory of Smart Grid Protection and Control Jiangsu Province Nanjing211000 China

ISBN: (纸本)9789811671555

In a renewable energy power system dominated by a high proportion of wind power, the configuration of energy storage system is an effective solution to mitigate wind power fluctuations, ensure the safe and stable operation of the grid, and improve the dispatch ability of wind power. This paper proposes a battery energy storage system (BESS) control strategy with the consideration of the impact of future wind power. To achieve maximum bidirectional output capability and minimum output of BESS, multi-objective hybrid optimization model is built on base of first-order low-pass filter’s variable time constant Tf, which contains two weight coefficients c1 and c2 to flexibly adjust BESS output. Markov chain prediction model is introduced to forecast the future multi-step wind power and PSO optimization algorithm is used to obtain the optimal BESS output power in real-time rolling calculation. Finally, the effectiveness of the proposed control strategy is verified through case studies. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Low pass filters

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Distributed transmission technology of node status in distribution network 2

Distributed transmission technology of node status in distri...

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2021 2nd International Conference on Electrical, Electronic Information and Communication Engineering, EEICE 2021

作者： Tan, Kuo Wu, Hai Hu, Guo Chen, Hui NARI Technology Co. Ltd. Nanjing211000 China Nanjing211000 China State Key Laboratory of Smart Grid Protection and Control Nanjing211000 China

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

关键词： Energy transfer

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Influence of Generator-tripping Time on Transient Stability

Influence of Generator-tripping Time on Transient Stability

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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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A Fault Ride-Through Method of Paralleled Synchronous and Virtual Synchronous Generators in Islanded Microgrids 5

A Fault Ride-Through Method of Paralleled Synchronous and Vi...

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5th IEEE Conference on Energy Internet and Energy System Integration, EI2 2021

作者： Ru, Yanfei Zhao, Feng Jin, Zhangtao State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing211106 China College of Electrical and Information Engineering Hunan University Changsha410082 China

ISBN: (纸本)9781665434256

With the development of distributed power generation technologies, parallel operations of virtual synchronous generators (VSGs) and synchronous generators (SGs) become increasingly common in a microgrid. Due to the low overcurrent capacity of VSGs, fault ride-through (FRT) is necessary for microgrids, which makes the transient stability of SG-VSG-based microgrids be different from the traditional power system. In this paper, a new abnormal overcurrent phenomenon caused by FRT is discovered in SG-VSG-based islanded microgrids. Then, characteristics of the output current of the VSG which uses different parameters are compared and analyzed. Furthermore, an optimized FRT method is proposed, which suppresses the abnormal overcurrent. Finally, a simulation is performed to verify the effectiveness of the proposed method on the PSCAD/EMTDC. © 2021 IEEE

关键词： Synchronous generators

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Remote closed-loop test method of safety and stability control system based on step-by-step implementation 2

Remote closed-loop test method of safety and stability contr...

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2nd International Conference on Digital Society and Intelligent Systems, DSInS 2022

作者： Zhao, Wei Hou, Yuqiang Chen, Xiong Xue, Feng Chen, Wei Chen, Luofei Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China PONOVO Power Co. Ltd. Beijing100000 China

ISBN: (纸本)9781510663244

The safe operation of the safety stability control system is an important means to ensure the safe and stable operation of AC and DC power grids. Aiming at the shortage of existing test methods that cannot perform closed-loop testing of field safety stability control systems, a remote closed-loop test method for safety stability control systems based on step-by-step implementation is proposed. Using the simulation results of real-time digital simulation system (RTDS) as the signal source, a remote test platform architecture integrating laboratory and field safety and stability control devices is designed, key modules such as platform management system, test master and test terminal are developed, specific solutions are given for platform communication, and a remote closed-loop test procedure is formulated. Finally, a pilot application is carried out with an actual power grid security and stability control system as an example, and the effectiveness of the proposed method is verified. © 2023 SPIE.

关键词： Real time systems

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