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power System Small-signal Stability Assessment Model Based on Residual Graph Convolutional Networks

Journal of Physics: Conference Series 2021年第1期2095卷

作者： Yinsheng Su Mengxuan Guo Haicheng Yao Lin Guan Jiyu Huang Siting Zhu Zhi Zhong Department of Power System Operation China Southern Power Grid Guangzhou China School of Electric Power South China University of Technology Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China

Small-signal stability (SSA) is important to power system security. A data-driven approach is established for rapid prediction of the power system oscillation characteristics. The key of the approach is the Graph Convolution Networks (GCN) with residual mechanism, which works to aggregate features from high-dimension steady-state operation information and is denoted as ResGCN (RESidual GCN) in the paper. The residual mechanism helps to overcome the network degradation phenomenon. Both the oscillation frequency and damping ratio of multiple modes can be predicted by the proposed model. The performance of the proposed scheme as well as its adaptability to the power system topological changes is verified on the IEEE 39 Bus system.

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An Optimal Dispatch Strategy of Distribution Networks with Electric Vehicle Charging Stations Integrated Energy Storage

An Optimal Dispatch Strategy of Distribution Networks with E...

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2019 IEEE PES Innovative Smart grid Technologies Asia, ISGT 2019

作者： Fan, Jianjun Bi, Shaocong Yuan, Hong Han, Yuankai Wu, Qiongshan Liu, Xiaoyi Li, Xiao State Grid Dezhou Power Supply Company Dezhou China Shandong Luneng Intelligence Technology Co. Ltd Jinan China Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Ministry of Education Jinan China

ISBN: (纸本)9781728135205

With increased penetration of distributed energy resources and electric vehicles (EVs), EV charging stations integrated with energy storage (ES) is regarded as an important measure to mitigate the power fluctuation and support the distribution networks. Therefore, this paper works on the dispatch strategy of distribution networks with EV charging stations coupled with ES. Firstly, a within-day dispatch model of distribution network is established which consider the characteristics of EV charging load. Secondly, an optimal dispatch strategy is proposed to minimize the daily operation cost, which consider the difference of electricity price under peak and valley load curve. Finally, Case studies are conducted and the simulation results demonstrate that the proposed dispatch strategy can greatly reduce the economic operation costs and smooth the power fluctuations within the charging station. © 2019 IEEE.

关键词： Electric vehicles

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Study on Distributed Generation to Improve Stability of Distribution Network Based on Virtual Synchronous Generator Technology 8

Study on Distributed Generation to Improve Stability of Dist...

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8th IEEE International Conference on Advanced power System Automation and protection, APAP 2019

作者： Yan, Li Xinshou, Tian Juan, Hu Zhankui, Zhang Hui, Yu Xiong, Xiong Ming, Wu Wenyuan, Ma China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy Storage Systems Beijing China State Grid Shanghai Energy Internet Research Institute Co. Ltd Advanced Energy Center Shanghai China

ISBN: (纸本)9781728117225

The distributed integration and local consumption of distributed generation represented by wind energy and solar energy have attracted widespread attention. In recent years, distributed generation has developed rapidly, but at the same time, many new problems have emerged. These problems have threatened the safe and stable operation of power systems in some extent. Compared with the traditional synchronous generator, the distributed generation based on the power electronic converter interface has a very fast response speed and does not have the rotational inertia and damping component inherent to the synchronous generator. When there is too much distributed generation in the system, it will definitely threaten the safe and stable operation of the power system. The generator using the converter has the capability of synchronous inertia, damping, primary frequency, and reactive voltage regulation based on the virtual synchronous generator technology simulates the electromechanical transient characteristics of the synchronous generator. The virtual synchronous generator technology can improve the safe and stable operation capability of the grid after large-scale distributed power integration. This paper provides an introduction about the study on distributed generation to improve stability of distribution network based on virtual synchronous generator technology, and tries to explore virtual synchronous generator control principle for distributed generation with the analysis of impact of distributed generation grid-connected, the distributed generation virtual synchronous generator control is introduced. © 2019 IEEE.

关键词： Distributed power generation

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Voltage pole-wave protection scheme for multi-terminal DC grid

Voltage pole-wave protection scheme for multi-terminal DC gr...

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作者： Xie, Zhongrun Zou, Guibin Gao, Lei Zhang, Jie Gao, Houlei Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education School of Electrical Engineering Shandong University Ji'nan China State Grid Ji'nan Electric Power Company Ji'nan China

With the rapid development of flexible DC transmission and multi-terminal high voltage direct current transmission (HVDC) (MTDC) grid, the protection schemes of flexible DC transmission lines are still the traditional methods, which do not achieve the properties of fast and selective operation in the DC grid. In this study, using Zhangbei MTDC grid as the research object, the fast protection of DC transmission lines of MTDC grid has been studied. First, the voltage response characteristics of fault line and non-fault line at the boundary of DC lines are analysed. On the basis of this, using wavelet transform to extract the characteristic value of voltage pole-wave, this study put forward a high-speed non-unit protection criterion to identify the internal and external faults. In addition, two auxiliary criteria are constructed to identify lightning disturbance and faulted pole, respectively. Finally, a simulation model of Zhangbei MTDC grid is constructed, and the effectiveness of the proposed protection scheme is verified by extensive simulation results. © 2019 Institution of Engineering and *** right reserved.

关键词： Poles

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Ensemble Machine Learning Identification of power Fault Countermeasure Text Considering Word String TF-IDF Feature

Ensemble Machine Learning Identification of Power Fault Coun...

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2018 IEEE International Conference of Safety Produce Informatization, IICSPI 2018

作者： Sun, Shaohua Dai, Zemei Xi, Xinkui Shan, Xin Wang, Bo NARI Group Corporation State Grid Electric Power Research Institute Nanjing211106 China NARI Technology Co. Ltd. Nanjing211106 China State Key Laboratory of Smart Gird Protection and Control Nanjing211106 China Power Dispatching Automation State Grid Hebei Electric Power Co. Ltd. Shijiazhuang050022 China

ISBN: (纸本)9781538655139

A large amount of fault countermeasure texts are used to guide fault handing operations in power dispatching systems. This paper transforms the identification problem of fault countermeasure disposal text into a classification problem for identifying the content of text, understanding the meaning of text and building an intelligent power grid fault handling automation system. Firstly, the characteristics of fault countermeasure text are analyzed, and the text is preprocessed according to the characteristics and classification requirements. (Term Frequency-Inverse Document Frequency) TF-IDF is used to analyze and extract and vectorize the features of words and word strings in text, then concatenated feature vectors are used to vectorize the text. classification models are built based on a variety of machine learning methods. Examples show that the feature extraction method taking TF-IDF of word string into consideration is superior to word TF-IDF, and the classification effects of different machine learning methods are compared. The examples also show that the ensemble machine learning classification model has better classification effect than the single classifier, and can identify the text of fault countermeasure disposal more accurately and efficiently. © 2018 IEEE.

关键词： Inverse problems

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Inertia Evaluation for power System Based on Quasi-Steady-state Data

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IOP Conference Series: Earth and Environmental Science 2021年第1期838卷

作者： Hao Qin Yongji Cao Hengxu Zhang Zhimin Gao Huan Ma Dong Yang Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan China State Grid Shandong Electric Power Research Institute State Grid Shandong Electric Power Company Jinan China

With the integration of renewable energy sources, the power system equivalent inertia has dropped significantly. It is urgent to conduct the online evaluation of inertia. Current inertia evaluation methods are mostly based on the rate of change of frequency under large disturbances. In order to evaluate inertia under quasi-steady-state operation, an evaluation method is proposed based on system identification. The monitoring data under the quasi-steady-state operating conditions of the power system is acquired through the synchronous phasor measurement units (PMUs). And the PMU data including frequency and active power under small disturbances are used for the quantitative evaluation of inertia. The WSCC 9-bus system is established to verify the effectiveness of the proposed method.

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High-altitude fall prevention method and device for power transmission line

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IOP Conference Series: Earth and Environmental Science 2021年第1期791卷

作者： Zhigang Wang Yuexiong Ou Hui Li Wenyuan Zeng Quanzhe Gao Yu Zou Peng Li Live Line Operation Center Power Transmission Maintenance Branch of State Grid Hunan Electric Power Co. Ltd. ChangSha Hunan 410000 China Intelligent live working technology equipment (robot) Hunan Provincial Key Laboratory ChangSha Hunan 410000 China Live inspection and intelligent operation technology State Grid Corporation Laboratory

This paper analyzes the structure of transmission line towers and live working conditions, and draws conclusions on the importance and necessity of studying the methods and devices of high-altitude fall prevention for transmission lines. Combining the actual situation of the pole and tower, in view of the poor manufacturing technology of the pole and tower anti-falling track, the size of the anti-dropping device and the track are not matched, and the connection point is misplaced, a new type of adjustable anti-dropping device is developed to address the cross-arm movement of personnel during live work. The alternate use of backup protection ropes and seat belts is cumbersome. An alternative safety rope was developed. Aiming at the transmission line towers without anti-falling tracks, a drone-based high-altitude fall prevention method was developed, and an anti-fall manipulator for high-altitude operations.

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Design and Implementation of Lightweight Manmachine Terminal Screen Interactive Client

Design and Implementation of Lightweight Manmachine Terminal...

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

作者： Zhimeng Lv Lingyan Que Caishen Fang Xingzhi Wang Yuan He Kun Huang 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 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: (数字)9781728196060

ISBN: (纸本)9781728196077

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.

关键词： Couplings Visualization Automation Prototypes Rendering (computer graphics) Man-machine systems Geographic information systems

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Corrections to “Decision Support System for Adaptive Restoration control of Transmission System”

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Journal of Modern power Systems and Clean Energy 2021年第5期9卷 1237-1237页

作者： Ze Li Yusheng Xue Haohao Wang Lili Hao School of Electrical Engineering Southeast University Nanjing China State Grid Electric Power Research Institute (NARI Group Corporation) Nanjing China State Key Laboratory of Smart Grid Protection and Operation Control Nanjing China School of Electrical Engineering and Control Science Nanjing Tech University Nanjing China

In [1], the complete affiliation of Yusheng Xue is as follows: Y. Xue (corresponding author) is with the School of Electrical Engineering, Southeast University, Nanjing, China, and he is also with state grid Electric power Research Institute (NARI Group Corporation), Nanjing, China, and state key laboratory of Smart grid protection and operation control, Nanjing, China.

关键词： Electrical engineering Adaptive systems control systems power systems Smart grids

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Design of Real-time Message Synchronization cross Smart grid Dispatching System

Design of Real-time Message Synchronization cross Smart Grid...

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

作者： Chunlei Xu Tong Liu Baolong Lei Hui Peng State Grid Jiangsu Electric Power Co. Ltd. Nanjing China NARI Technology Co. Ltd. Xi’an China NARI Technology Co. Ltd. Nanjing China 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)9781728196060

ISBN: (纸本)9781728196077

In the integrated operation mode of the smart grid dispatching and control system, there is a large amount of real-time data such as important alarms and manual operations that need to be shared between systems. How to synchronize these real-time data across systems with high reliability and performance becomes a problem to be solved. This paper studies the application scenarios of cross-system message synchronization and proposes a scheme based on redundant dual networks, including hardware and software architecture. The key technologies and important functions were implemented, reliability and throughput verifications were performed, and the expected results were achieved.

关键词： control systems Throughput Dispatching Real-time systems Smart grids Software reliability Synchronization

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