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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Xu, Lufei Chen, Tianhua Yang, Luo Chen, Jianhua Du, Lei Zhong, Hailiang 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 State Grid Ningxia Electric Power Co. Ltd. Yinchuan750001 China

ISBN: (纸本)9781728135205

To solve the reactive power and voltage coordinated control of parallel running static synchronous compensator (STATCOM) in wind farm, a reactive power and voltage coordinated control strategy is proposed based on the united control mode of voltage control and reactive power control. The strategy makes full use of the control characteristics of STATCOM fast regulation and stable voltage, the voltage of the point of common coupling (PCC) connect with power system is quickly adjusted, and optimize the dynamic reactive power which reserve in wind farm. Finally, the wind farm in china wind power cluster area is taken as an example for practical application, the practical application results verify the correctness and effectiveness of the proposed control strategy. © 2019 IEEE.

关键词： Voltage control

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A Fast Blocking Method of Bus protection when CT Disconnected Based on Braking Current and Zero Sequence Current

A Fast Blocking Method of Bus Protection when CT Disconnecte...

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Sustainable Power and Energy Conference (iSPEC)

作者： Yincheng Wang Jie Zhu Wei Dai Xiang Zhu Xiaohong Wang Kaiyu Zhang NARI Technology Co. Ltd NARI Group Corporation Nanjing China Maintenance company of State Grid Tibet Electric Power Co. Ltd State Grid Tibet Electric Power Company Lhasa China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

Current transformer (CT) disconnection of bus is prone to maloperation of bus differential protection. The existing criteria for CT disconnection do not fully consider the distinction between heavy load high impedance fault and external metal fault transfer to internal high impedance fault. And not fully consider the influence of one-half wiring circulation and unbalanced impedance on CT disconnection zero sequence criterion. Based on the theoretical analysis of the characteristics of braking current variation and zero sequence current distribution in the event of internal fault, this paper puts forward a fast blocking criterion of CT disconnection based on braking current and zero sequence current, and carries out simulation verification. Both the theory and the simulation show that there is a drop of braking current in the event of internal fault. The distribution of zero sequence current in the event of CT disconnection is obviously different from that in the event of internal fault. The criterion proposed in this paper can effectively and reliably distinguish CT disconnection from internal fault.

关键词： Wiring Analytical models Current transformers Reliability theory Current distribution Impedance Load modeling

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Large generator rotor distortion sensing monitoring technology research

Large generator rotor distortion sensing monitoring technolo...

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Electrical Engineering and Automation (IFEEA), International Forum on

作者： Zhou Shaoliang Chen Li Shen Jian Sun Jianping State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation (State Grid Electric Power Research Institute) Co. Ltd Nanjing China NARI Group Corporation (State Grid Electric Power Research Institute) Co. Ltd NARI Technology Corporation Co. Ltd Nanjing China

ISBN: (数字)9781728196275

ISBN: (纸本)9781728196282

In view of the shortage of direct measurement method for shafting of large generator sets, this paper proposes a sensor monitoring technology based on illumination emphasis. The article first introduces the research status of the shaft torque of thermal power units, and expounds the theory of mode interference and the theory of twist sensing. Then, the LP mode simulation of single-mode fiber and two-mode fiber is carried out, which is an effective method for symmetrical higher-order mode. Finally, the simulation of the mode interferometer, the spectrum and the phase during twisting is carried out. It is clarified that the non-circular symmetrical mode with π phase difference electric field distribution is the key inducement of the interferometric phase jump and spectrum flipping in twisting measurement. This article provides theoretical guidance for subsequent device fabrication and spectral distortion analysis.

关键词： Optical fiber sensors Optical interferometry Phase measurement Perturbation methods Optical distortion Distortion Optical fiber theory

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Reliability analysis of autonomous controllable protection device in power system

Reliability analysis of autonomous controllable protection d...

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International Conference on Power Electronics Systems and Applications (ICPESA)

作者： Chen. Li Qiu. Yutao Chen. Jianing Huang. Xuliang State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation (State Grid Electric Power Research Institute) Co. Ltd Nanjing China State Grid Zhe Jiang Electric Power Co .LTD. State Grid Zhejiang Electric Power Company Hangzhou Power Supply Company

ISBN: (数字)9781728188904

ISBN: (纸本)9781728188911

With the deepening of the concept of autonomous control in the power system, more and more attention is paid to the stability of the protection device itself. Compared with the primary equipment condition monitoring, the fault of the secondary protection device will be more concealed. This paper analyzes the factors affecting the reliability of protection devices, forms the life cycle prediction method of substation protection devices, and ensures the safe and stable operation of intelligent substation. Analyzed the reliability of the relay protection device related concepts, from the failure mechanism, through the establishment of joint aging failure based on the Arrhenius model and Weibull distribution model, and based on grid relay protection device, the data is using LM method for joint failure rate estimate the parameters of the model, get old equipment failure rate model of concrete, to determine the reliability of the protection device and the effective service life. An example shows that the model proposed in this paper can effectively predict the failure trend and life boundary of the device, and provide a theoretical basis for the daily maintenance of smart substation.

关键词： Analytical models Protective relaying Reliability theory Predictive models Power system stability Data models Power system reliability

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Rule Extraction-based Data Augmentation Method for Transient Instability Identification of Power Systems Using Machine Learning

Rule Extraction-based Data Augmentation Method for Transient...

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2019 IEEE Sustainable Power and Energy Conference, iSPEC 2019

作者： Zhou, Yanzhen Guo, Jian Guo, Qinglai Sun, Hongbin Lu, Yaohua Xu, Xiongfeng Tsinghua University Department of Electrical Engineering Beijing China Power Research Institute Nari Group Corporation State Grid Electric Jiangsu China State Key Laboratory of Smart Grid Protection and Control Jiangsu China

ISBN: (纸本)9781728149301

Machine learning methods have become a promising method for rapid identification of transient stability and unstable generators of power systems. However, the transient unstable instances are always fewer than stable instances, which brings difficulties of transient instability identification. This paper presents a data augmentation approach to increase the number of unstable instances. Firstly, original data will be generated by time domain simulation considering the randomness and limitations of power systems. Then, the patient rule induction space (Prism) method is used to obtain the unstable rule set from the training data. After that, new instances can be generated by the unstable rules and time domain simulation. Then, the machine learning method is used to generate the transient stability prediction model and unstable generator identification model based these two kinds of instances. All the generated instances can be verified by time domain simulation. Comprehensive studies are conducted on the New England 10-machine 39-bus system to verify the effectiveness of the proposed approach. © 2019 IEEE.

关键词： Transients

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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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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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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.

关键词：

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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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