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作者： Chao Shen Jinxia Dai Mengge Mao Kun Zhao Zhen Yan Kun Huang NARI Group Corporation (State Grid Electric Power Research Institute) State Key Laboratory of Smart Grid Protection and Control

In view of the particularity of Chinese word segmentation in the professional field of power grid regulation,the performance of Chinese word segmentation based on traditional statistical algorithm is frequently limited by the corpus training in the proprietary field,and the insufficient ability of Chinese word segmentation based on dictionary algorithm in identifying new words and disambiguation in the proprietary *** paper proposes a Chinese word segmentation method based on the combination of dictionary and statistical method,and applies it to the application scenario of querying the operation status of power *** method constructs a professional dictionary in the field of power grid regulation by using the Double-Array Tree storage *** using the CRF(Conditional Random Fields)train the text data to generate the model file,and the FMM(Forward Maximum Matching) method is used for Chinese word segmentation combined with the professional dictionary in the field of power grid regulation.A fast and accurate online word segmentation method in the field of power grid regulation is designed and implemented,it performs well in some main performance *** the application scenario of querying the power grid operation status,the Chinese word segmentation results obtained by this method combined with the standard query sentence pattern realize the rapid classification of application scenario query and the accurate execution of operation commands,greatly improve the efficiency and accuracy of querying the power grid operation status,and improve the human-computer interaction experience.

关键词： Chinese word segmentation Dictionary Statistical methods Scenario application of power grid regulation

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Cyber-attack-tolerant Frequency control of power Systems

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Journal of Modern power Systems and Clean Energy 2021年第2期9卷 307-315页

作者： Chunyu Chen Kaifeng Zhang Ming Ni Ying Wang the School of Electrical and Power Engineering China University of Mining and TechnologyXuzhou 221116China the School of Automation Southeast UniversityNanjing 210096China NARI Group Corporation(State Grid Electric Power Research Institute) Nanjing 211106China NARI Technology Co. Ltd.Nanjing 211106China State Key Laboratory of Smart Grid Protection and Control Nanjing 211106China

Cyber attacks are emerging threats in the Internet of Things applications,and power systems are typical cyber attack *** one of the most essential operation functions,frequency control is threatened by cyber intrusions,and the existing centralized control mode cannot effectively address cyber *** this study,a new distributed cyber-attack-tolerant frequency control scheme is *** distributed control mode also serves as a convenient tool for attack *** designed cyber-attack-tolerant frequency controller adopts the idea of passive fault attenuation,thus simplifying the design *** the aid of graph theory and consensus techniques,distributed integral based and model predictive control(MPC)based controllers are *** with the integral type,the MPC-based controller can simultaneously improve the dynamic responses and the tolerance ability under *** proposed controller is validated via an IEEE benchmark system,and the effectiveness of its application in actual power systems is verified.

关键词： Frequency control cyber attack distributed control passive fault attenuation cyber-attack-tolerant frequency control

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Transition Metal (AU, Ag, Pt, Pd, Ni) Doped MoS2 as Gas Sensing Materials for C4F7n Leakage Detection: A Comparative Study

SSRN

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SSRN 2023年

作者： Yan, Yongxu Li, Yi Zhang, YiFan Wu, Peng Tang, Ju Zhang, Xiaoxing Xiao, Song State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and Automation Wuhan University Wuhan China Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Hubei University of Technology Wuhan430068 China

Fluorinated nitrile (C4F7N) has been considered a novel eco-friendly gas insulating medium, while the low toxicity and leakage risk urgently urge the development of C4F7N gas sensor. Herein, we analyzed the sensing performance of transition metal doped MoS2 to C4F7N based on the density functional theory (DFT). The adsorption energy, charge transfer, deformation charge density and density of states were explored. Furthermore, the sensitivity and recovery performance were analyzed based on frontier orbital and transition state theories. It was found that Pd-MoS2 can achieve a superior balance between sensitivity and response time, showing promising potential for C4F7N leak detection for engineering applications. © 2023, The Authors. All rights reserved.

关键词： Density functional theory

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Research and Application of Simplified Service Bus in New Generation Dispatching Technical Support System and Heterogeneous System 6

Research and Application of Simplified Service Bus in New Ge...

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6th IEEE Conference on Energy Internet and Energy System Integration, EI2 2022

作者： Qiang, Yi Shupeng, Wan Zhemin, Wang Weihua, He Ping, Zhang Feng, Zhang NARI Technology Co. Ltd System R&D Center Nanjing China State Grid Shanxi Electric Power Co. Ltd Taiyuan China State Key Laboratory of Smart Grid Protection and Control System R&D Center Nanjing China

ISBN: (纸本)9798350347159

With the rapid development of UHV AC / DC hybrid power grid, in order to cope with the large-scale access of new energy, the power market reform has been continuously promoted. Therefore, it is proposed to build a new generation of dispatching technical support system to meet the needs of future power system development and safe, stable and high-quality operation. This paper proposes a simplified service bus that supports a new generation of service-oriented architecture, and meets the deployment characteristics of cloud terminals that are cross platform, lightweight, easy to deploy, open and efficient. The simplified service bus can well meet the location independent characteristics and be easily deployed in and out of the system. The flexible protocol processing mode cooperating with the gateway can meet the needs of accessing the services of the system and external systems. At the same time, it supports multiple man-machine network and automatic switching of service network shutdown under N-1 mode, which greatly improves the availability and stability of the system, Which Provide a strong guarantee for the safe, stable and efficient operation of the new generation system. © 2022 IEEE.

关键词： Gateways (computer networks)

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Voltage Waveform Comparison Longitudinal protection Method Based on Improved Bhattacharyya Coefficient for AC / DC Hybrid power grid

Voltage Waveform Comparison Longitudinal Protection Method B...

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Electrical Engineering and control Science (IC2ECS), International Conference on

作者： Hongzhe Zhang Wei Cong Lin Li Meiyang Zuo Yu Zhu Jiadong Xu Xu Dong Chen Li State Grid Jinan Power Supply Company Jinan Shandong China Key Laboratory of Power System Intelligent Dispatch and Control (Shandong University) Jinan Shandong China

If a fault happens on the AC line of a new form of AC/DC hybrid power grid, the fault characteristics and changes in electrical quantities after faults in a new type of power grid are completely different from traditional grids. The protection based on the electrical quantity of traditional AC systems will be affected. A method to solve the problem is put in this article. This article investigates the relationship between waveform similarity and fault location, and the improved Bhattacharyya coefficient method is applied to judge the similarity. Longitudinal protection logic is used to distinguish between the two types of faults. The simulation results which are based on PSCAD show that the method is applicable.

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Evaluation of Wind power Acceptance Capacity Based on N-1 Static Voltage Stability Region

SSRN

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SSRN 2024年

作者： Shu, Hongchun He, Yefu Wang, Guangxue Shi, Botao Zhang, Hanxin Zaho, Zhixin State Key Laboratory Collaborative Innovation Center for Smart Grid Fault Detection Protection and Control Jointly Kunming University of Science and Technology Kunming China Yunnan Key Laboratory of Green Energy and Digital Power Measurement Control and Protection Faculty of Land Resource Engineering Kunming University of Science and Technology China

Wind power generation is random and volatile with significant seasonal characteristics. Large-scale grid-connected wind power has an impact on the static safety of the system, especially under N-1 fault conditions. Therefore, this paper proposes an evaluation method of wind power acceptance capacity based on N-1 static voltage stability region to assess the maximum wind power acceptance capacity of the system. To accurately describe the dynamic correlation and seasonal characteristics of wind power generation in adjacent wind farms, a wind power output model is established based on k-medoids clustering and dynamic Copula function. Then, the seasonal generated scene data replaces the original wind power data for acceptance capacity assessment. The N-1 static voltage stability region model for wind power access is established, and the characterization method of wind power access to the N-1 static voltage stability region is determined by targeting search, searching, and selecting the most serious N-1 state. Monte Carlo is utilized to simulate the mathematical model of wind power acceptance capacity evaluation under different seasons, and combined with the N-1 static voltage stability domain, the maximum wind power acceptance capacity curve of the system is obtained. To verify the effectiveness of the proposed method, the IEEE-30 system connected to wind power is taken as an example for simulation analysis. The results show that the proposed method can quickly evaluate the maximum wind power acceptance capacity in the N-1 state, providing a basis for the planning and operation of a new energy power system with practical significance. © 2024, The Authors. All rights reserved.

关键词： power generation

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Active Support Performance Test of grid-connected Photovoltaic System Based on grid-forming control

Active Support Performance Test of Grid-connected Photovolta...

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intelligent power and Systems (ICIPS), International Conference on

作者： Xinze Xi Yun Hu Chao Xing Qi Guo Shoudong Xu Liang Tu Peng He Yihua Zhu Mingzhang Su Chao Luo Yunnan Electric Power Research Institute Kunming China National Energy Power Grid Technology R&D Centre Guangzhou China State Key Laboratory of HVDC Electric Power Research Institute CSG Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

With the continuous increase penetration of new energy, the integration of grid-following (GFL) converter is prone to frequency stability issue, while the utilization of grid-forming (GFM) converter with active support capability has become an inevitable trend in development. In this paper, the model of grid-connected photovoltaic system using GFL/GFM control is established. The support characteristic of GFM is compared and analyzed in different testing scenarios with GFL as the reference: (1) Small disturbance test (2) Large disturbance test (3) Island capability test. Finally, the active support performance of the system is quantitatively analyzed based on corresponding evaluation indexes.

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Multi-Component Mixed Oil with Transformer Typical Material Compatibility Analysis

Multi-Component Mixed Oil with Transformer Typical Material ...

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power Engineering (ICPE), International Conference on

作者： Ying Liu Guofeng Fu Hongwei Li Wenyu Ye Yekang Qin Zhijian Huang Liangyuan Chen Guigang Power Supply Bureau Guangxi Power Grid Co. Ltd. Guigang China State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering Chongqing University Chongqing China Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Nanning China

ISBN: (数字)9798331531140

ISBN: (纸本)9798331531157

Mixed insulation oil can complement the performance advantages of different oils and can be directly applied to existing mineral oil transformers without changing the transformer structure, which is an important development direction of high voltage and large capacity transformers. The compatibility study of mixed insulation oil and typical transformer materials has important significance for transformer design and operation. In this paper, we investigated the compatibility of multi-component mixed oil (MCMO) with typical transformer materials, and analyzed the changes in color, viscosity, relative dielectric constant, dielectric loss factor, volume resistivity, breakdown voltage, acid value, and interfacial tension parameters of MCMO before and after thermal aging. The results show that the MCMO has good compatibility with iron block, silicon steel sheet, enameled wire and epoxy plate, and the MCMO showed remarkable stability in kinematic viscosity, relative dielectric constant and breakdown voltage. But it has some compatibility problem with nitrile rubber.

关键词： Viscosity Dielectric constant Oils Oil insulation Market research Stability analysis Thermal analysis Rubber Thermal stability power transformer insulation

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Bayesian Probability intelligent Forecasting Model Based on Rainfall during Flood Season

Bayesian Probability Intelligent Forecasting Model Based on ...

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Information Science, Parallel and Distributed Systems (ISPDS), International Conference on

作者： Peng Zeng Wei Zhang Yangjun Zhou Guohui Wei Guangxi Meteorological Disaster Prevention Technology Center Nanning China Guangxi Key Laboratory of Intelligent Control and Operation and Maintenance of Power Equipment Electric Power Research Institute of Guangxi Power Grid Co. Guangxi Power Grid Equipment Monitoring and Diagnosis Technology Innovation Center Electric Power Research Institute of Guangxi Power Grid Co. Ltd. Nanning China Customer Service Center of Guangxi Power Grid Co. Ltd Nanning China

ISBN: (数字)9798350352719

ISBN: (纸本)9798350352726

In order to make better use of the revised ensemble probability forecast based on the information of the historical prior probability precipitation distribution function, based on the Bayesian probability decision theory, this paper used the actual rainfall data from 1981 to 2010 in Xijiang River Basin and the European ensemble forecast products from April to September in 2016 as the prior information, and established Bayes based probability prediction model for heavy rain in Xijiang River Basin to correct the European ensemble probability prediction products and to carry out the grading test. Bayesian methods are more accurate than other methods, making it easier to establish predictive models. From the results of forecasting experiments, it can be seen that the ensemble probability forecasting product modified by the Bayesian method can improve the forecasting ability of heavy rain in flood season. Except for September, the Brier scores (BS) of other months in flood season within 24-72 hours are better than those of ensemble probability forecast, and the possibility of a false heavy rain forecast can be reduced to a certain extent; there is a monthly difference in the distribution of the true skill statistic (TSS) high score areas in pre-flood season: with the increase of precipitation intensity and scope from April to June, the scores of most river basins increase. In conclusion, this work can provide a reference for forecasters to carry out the prediction of heavy rainfall in the Xiiang River Basin.

关键词： Information science Rain Decision theory Europe Predictive models Bayes methods Rivers

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Study on the corresponding relationship between critical points of P-V Curve and V-Q curve of simple thevenin equivalent system 1

Study on the corresponding relationship between critical poi...

引用

1st IEEE China International Youth Conference on Electrical Engineering, CIYCEE 2020

作者： Li, Xuan Li, Zhaowei Guan, Linlin Wu, Xuelian Mei, Yan Li, Jun State Grid Electric Power Research Institute State Key Laboratory of Smart Grid Protection and Operation Control Nanjing211106 China

ISBN: (纸本)9781728196596

With the further increase in power demand for highly concentrated load centers and the gradual formation of a power system with a high proportion of new energy sources, China will face severe risk of voltage instability. In this paper, firstly, the load bus voltage equation of simple Thevenin equivalent system is derived, and then the P-V and V-Q curves are obtained respectively. Secondly, the mutual restriction relationship between active and reactive power of load is discussed when there is a real value solution to the voltage. Finally, the relationship between the voltage of critical points of the P-V curves and the reactive power of the load, and the relationship between the voltage of critical points of the V-Q curves and the active power of the load are deduced respectively. The relationship of one-to-one correspondence between critical points of P-V curves and critical points of V-Q curves is proved according to the mutual restriction between active power and reactive power of load and monotonicity of critical voltage and load power function. © 2020 IEEE.

关键词： Reactive power

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