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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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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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Unreasonable reactive power flow of traditional SVC and a novel SVC model against it

Unreasonable reactive power flow of traditional SVC and a no...

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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Ge, Huaichang Chen, Tianhua Chen, Hao Ding, Haoyin Guo, Qinglai Wang, Bin Xu, Fengda State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing100084 China NARI Group Corporation State Grid Electric Power Research Institute Nanjing211106 China NARI Technology Co. Ltd. Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China East China Grid Corporation No. 882 Pudong South Road Shanghai200120 China

ISBN: (纸本)9781728135205

Recent years, various types of reactive power resources are installed in the power grid. Both of the complexity of and demand for better voltage regulation are increasing. AVC system is the most famous system-wide Q/V control system which consists of PVC, SVC and TVC. SVC controls the voltages of buses within a control zone by sending individual set-point values to PVCs belonging to the control zone. Traditional SVC assumes that PVCs within a control zone is decoupled and each PVC can reach the set-point value during a control period. However, the proof in this paper reveals the fact that if there are strongly coupled PVCs in a control zone, the competition between those PVCs will cause unreasonable reactive power flow. PVCs can't reach their set-points so a deviation of Q output is induced. In this paper, a novel SVC model is proposed so as to eliminate the Q deviation. Simulation work verified the proof and demonstrated the effectiveness of the proposed SVC model. © 2019 IEEE.

关键词： Electric load flow

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Design and Implementation of an Automated Test Framework for Electric Power Data Network based on the Unified Resource Scheduling

Design and Implementation of an Automated Test Framework for...

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International Conference on Advanced Power System Automation and protection (APAP)

作者： Ting Hu Qin Li Xin Huang Xiaoyang He 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)9781728117225

ISBN: (纸本)9781728117232

Traditional Electric Power Data Network (EPDN) device tests are implied manually with the testing resources utilized separately. Such way of testing is of low efficiency and is difficult for the management of device resources. With the rapid increase of testing tasks in the future, improving the test efficiency and the resource utilization is of great importance to the development of EPDN. In this article, we propose a novel automated test framework for EPDN. In particular, we abstracts the related knowledge from data of real world experimental resources and testing business, based on the extracted knowledge, we combine virtualization technology with automated testing technology and software quality management, and proposes an automated test framework with unified scheduling of testing resources. The proposed framework is evaluated with the task of route flapping testing. The provided test flow and test results prove the feasibility and the effectiveness of the proposed framework.

关键词： Testing Job shop scheduling Task analysis Instruments Routing protocols Cloud computing Topology

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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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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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Analysis of Tie-line Power Optimization in Integrated Energy Distribution System

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Energy Procedia 2019年 158卷 6484-6489页

作者： Liu Liu Dan Wang Hongjie Jia Weiliang Wang Zhengji Meng Yunqiang Zhi Shenxi Zhang Wei Du Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China Applied Energy UNiLAB: DEM (Distributed Energy and Microgrid) Tianjin China Key Laboratory of Control of Power Transmission and Transformation of Ministry of Education Shanghai Jiao Tong University Shanghai China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China

Recently, the concept of integrated energy distribution system (IEDS) has gained popularity both in academia and industry, it is characterized by the comprehensive integration of multi-energy carriers and flexible utilization of available resources including distribution generations (DGs). However, the stability problem caused by the intermittency of renewable energy and uncertainties of energy demands are among the main concerns that need to be regulated properly. To address this issue, a novel method of tie-line power optimization is proposed in this paper, where the synergies among various energy sectors are stressed. The model of regional energy station (RES) is studied to provide the model basis, which can be regarded as the coupling link of electric power system (EPS) and natural gas system (NGS). In this regard, the flexibility of energy conversion and dispatch can be utilized as a kind of controllable resources for the sake of tie-line power optimization. Therefore, the tie-line power can be regulated in a flexible way in response to the control signal from the dispatch center. Verified by numerical studies, the results show the efficiency and applicability of the proposed strategy.

关键词： integrated energy distribution system (IEDS) regional energy station (RES) multi-energy flow tie-line power regulation

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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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Power Fault Preplan Text Information Extraction Based on NLP

Power Fault Preplan Text Information Extraction Based on NLP

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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 texts recorded in Chinese exist in power grid enterprises. These texts contain abundant information of power system. Manually mining the text information is inefficient and the accuracy may vary with different dispatchers. In this paper, the power fault countermeasure text is taken as the object to study the power Chinese text information extraction method. Power texts are segmented firstly based on the nature language process (NLP), the ontology lexicon is established according to the power word attribute in the power fault countermeasure text;Based on the syntax structure characteristics of punctuations and the concept of separate parsing phrase are brought in to guide the division of long texts, which can separate the sentence with only one power entity and its related information;The syntax rule template applicable to the separate parsing phrase is established based on the meta-character templates (generalization slot, fixed word-combination, wildcard character, and registry function) used for the power fault preplan text information extraction and the structured output of that information;At last, the generalization ability and the universality of the template are analyzed. Examples show that the rule template applies to the information extraction of most texts with strong universality and high accuracy. © 2018 IEEE.

关键词： Syntactics

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