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Multi-dimensional Visualization Method of SCD File Information of intelligent Substation Based on Knowledge Graph

Multi-dimensional Visualization Method of SCD File Informati...

引用

Energy, Electrical and power Engineering (CEEPE), International Conference on

作者： Feng Wang Yiquan Li Qian Tan Ziliang Wu Jianglei Suo Qianshuo Gu Power Dispatching Control Center Guangdong Power Guangzhou China Key Laboratory of Power System Intelligent Dispatch and Control Shangdong University Jinan China

The structure of intelligent substation SCD file is complex, and there are many layers of information. Different functions have corresponding information basis, and often need to be associated across multiple information nodes, resulting in poor visualization. This paper presents a multi-dimensional visualization method of SCD file information of smart substation based on knowledge graph. Firstly, the file structure and function structure of SCD text expression are analyzed. Then the SCD file node is extended and the seven-step method is adopted to construct the intelligent substation ontology, which is realized by Protégé. The knowledge graph of substation is constructed by using ontology and relationship between SCD nodes. The graph expression of SCD is completed, and the visualization of file structure information is realized. The information path of functions such as the correlation between primary and secondary devices and the correlation between virtual and real circuits is mined. The information nodes in the path are searched in the SCD knowledge graph to realize the visualization of functional structure information. The above work was done through Neoj4, Python. The simulation results show that knowledge graph can decouple SCD information and realize multi-dimensional visualization of information with a high degree of visualization, which can provide guidance for operation and maintenance and information retrieval.

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A Data-Physics Fusion-Based Approach to power System Equivalent Inertia Assessment 7

A Data-Physics Fusion-Based Approach to Power System Equival...

引用

7th IEEE Student Conference on Electric Machines and Systems, SCEMS 2024

作者： Zhou, Chihan Kan, Changtao Li, Gengkun Zhai, Pengming Tian, Guojie Liang, Shuang Zhang, Shuolin State Grid Kunming Power Supply Company Kunming China State Grid Jinan Power Supply Company Jinan China State Grid Zhejiang Electric Power Co. Ltd. Lishui Supply Branch Lishui China Wenshan Power Supply Bureau of Yunnan Power Grid Co. Ltd. Grid Metering Center of Yunnan Power Grid Co. Ltd. Wenshan China Shandong Tianyu Changtong Energy Group Co. Ltd. Qingdao China Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Jinan China

ISBN: (纸本)9798350366945

In order to solve the error problem of the traditional inertia assessment method, a power system equivalent inertia assessment method incorporating machine learning technology is proposed. First, a physical model of single-machine equivalence is used, combined with a convolutional neural network (CNN) with self-adaptive and learning capabilities as a machine learning model. Second, the strongly correlated feature quantities are selected as inputs by analyzing the model structure and calculating the correlation between the inertia time constant and other feature quantities. In addition, the computational results of traditional evaluation methods are incorporated into the data model inputs, and the model parameters are optimized using the particle swarm optimization (PSO) algorithm. The simulation results prove that the proposed method has certain advantages in improving the accuracy of inertia estimation compared with the traditional method. © 2024 IEEE.

关键词： Convolutional neural networks

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A Reputation Based Network Security Isolation Method for power Systems 4

A Reputation Based Network Security Isolation Method for Pow...

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4th International Conference on Smart grid and Energy Engineering, SGEE 2023

作者： Huang, Yingqi Li, Man Cao, Yang Che, Xiangbei Zeng, Shiqin Suo, Siliang Shen Zhen Power Supply Co. Ltd. Shenzhen518000 China China Southern Power Grid Dispatching and Control Center Guangzhou510000 China Electric Power Research Institute Csg Guangzhou510000 China Guangdong Provincial Key Laboratory of Power System Network Security Guangzhou510000 China

ISBN: (纸本)9798350359619

In order to improve the security performance of power system networks, enhance data transmission security, and reduce latency, a reputation-based network security isolation method for power systems is proposed in this paper. In this method, the power system network reputation management model is first constructed, the design of a reputation mechanism is completed, and then the design of information privacy protection and shared information verification for the power system network are completed, and finally the progressiveness of the proposed method is verified by using the comparison method. The experimental results show that the proposed method has a data packet loss rate of less than 3.2% under different node numbers, a throughput of only 421 transactions/second, and a maximum transmission delay of only 44.8 ms, which is superior to the comparison method and has greater application value. © 2023 IEEE.

关键词： Network security

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Analysis and Research on the Reasons for the Increase of Com ponents in 500kV Transformer Oil 3

Analysis and Research on the Reasons for the Increase of Com...

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2022 3rd International Conference on Electrical, Electronic Information and Communication Engineering, EEICE 2022

作者： Li, Rui Chen, Liangyuan Li, Dajian Zhang, Lei Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Electric Power Research Institute of Guangxi Power Grid Co. Ltd. Nanning530023 China

This paper analyzes the cause of the defect of component growth in a 500kV transformer oil. First, the historical operation of the main transformer is analyzed, and then the oil chromatography data is studied. The A-phase online chromatography shows that the acetylene content is in good agreement with the offline chromatography detection, showing an increasing trend. The disintegration inspection of the main phase A phase found that there were two obvious discharge breakdown points in the inner paper tube of the low-voltage coil. According to the analysis results, the A-phase transformer should be managed and controlled, especially the oil chromatography tracking period (once every two weeks) should be shortened, and the load should be controlled if necessary. © Published under licence by IOP Publishing Ltd.

关键词： Chromatography

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Quantitative Analysis of power System Flexibility Based on K-Means Method and Copula Function

Quantitative Analysis of Power System Flexibility Based on K...

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58th IEEE/IAS Industrial and Commercial power Systems Technical Conference Asia (IEEE I and CPS Asia)

作者： Ma, Ruicong Cao, Yongji Zhang, Hengxu Lu, Ying Yu, Xueliang Hou, Yanruo Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China Tech Univ Denmark Dept Elect Engn Lyngby Denmark State Grid Shandong Elect Power Co State Grid Weifang Elect Power Co Weifang Peoples R China State Grid Hunan Elect Power Co State Grid Hunan Dispatching & Control Ctr Changsha Peoples R China

ISBN: (数字)9781665450669

ISBN: (纸本)9781665450669

power system flexibility analysis is important for grid development. For solving this problem, this paper constructs a flexible resource model of the power system to analyze the flexibility. The k-means method is adopted to classify the data. The probability models of wind power, PV output and load fluctuation in each scenario are constructed based on the Copula function, and the conditional probability of adjacent moments is solved by the Bayesian formula. Random sampling is performed based on the probability to generate the time series. The system flexibility margin expectation, shortage expectation and shortage probability are considered, and the operational economy is taken into account to establish quantitative assessment indices. The probabilistic optimal power flow (P-OPF) model with flexibility resources is constructed, and Monte Carlo simulation method is used to calculate the values of the assessment indexes. The IEEE RTS-24 system is used as an example to analyze the system flexibility.

关键词： renewable energy power system flexibility optimal power flow typical scenario generation

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Agent Simulation-Based Market Clearing Model for Reactive Auxiliary Services 6

Agent Simulation-Based Market Clearing Model for Reactive Au...

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

作者： Qi, Le Chen, Mingyuan Song, Jifeng Zhang, Minyu Zheng, Wenbin Shang, Qinghua Power Dispatching Control Center of Guangxi Power Grid Co. Ltd. Nanning China Guangxi University Key Laboratory of Guangxi Electric Power System Optimization and Energy-Saving Technology Nanning China

ISBN: (纸本)9798350347159

Reactive power is local and needs to be consumed locally;therefore, this paper investigates a sub-regional local market for reactive auxiliary services, where the power trading agency is responsible for receiving and aggregating the operating cost bids and opportunity loss bids from power generating companies. The power dispatch agency aims to minimize each local market's reactive power procurement costs, thereby minimizing reactive power generation subject to system constraints and voltage support. In this paper, a sub-regional reactive auxiliary services market clearing model with distributed energy participation is proposed and tested on an IEEE 24 bus system with each region as a node. The results show that the reactive market mechanism provided in this paper can incentivize extensive participation of new energy units and maintain sufficient reactive reserves and that the market power of individual units can be controlled within reasonable limits. © 2022 IEEE.

关键词： Reactive power

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Economic Analysis of the Application of Ice Storage Air Conditioning System in Chongqing 5

Economic Analysis of the Application of Ice Storage Air Cond...

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5th International Conference on Energy, Electrical and power Engineering, CEEPE 2022

作者： Yang, Gaofeng Liu, Sixu Mu, Jie Wang, Yi State Grid Chongqing Electric Power Company Dispatching Control Center Chongqing China Chongqing University State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing China

ISBN: (纸本)9781665479059

Based on the energy storage system, users can adjust the electricity load and participate in demand response while meeting their own energy demand. With the gradual advancement of power system reform, the potential benefits of ice storage technology application are increasing. Traditional methods for analyzing the economics of ice storage air conditioning systems tend to calculate and analyze the economic evaluation index of the system with fixed construction and operation strategies. Under the changing market environment and air conditioning load, it is difficult to accurately reflect the application value of ice storage technology. Therefore, this paper investigates a new economic analysis method that takes into account the collaborative optimization of the operation and planning of ice storage and cooling air conditioning systems. The method proposed in this paper takes the maximization of economic efficiency as the optimization objective and constructs constraints on the system operation strategy and investment plan. Finally, we build a mixed integer linear programming model which can be efficiently solved by a commercial solver. The numerical analysis takes Chongqing region as an example and analyzes the economic value of investing in an ice storage cooling air conditioning system under the local electricity price policy and air conditioning load characteristics. © 2022 IEEE.

关键词： Air conditioning Economics Analytical models Numerical analysis Atmospheric modeling Ice Numerical models

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The Application of Posterior Error Criterion to Dynamic Equivalence Evaluation 2

The Application of Posterior Error Criterion to Dynamic Equi...

引用

2nd International Conference on Electrical Engineering and Computer Technology, ICEECT 2022

作者： Sun, Zhiyuan Liu, Mosi Zheng, Kun Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Electric Power Research Institute Guangxi Power Grid Co. Ltd. Nanning530000 China

The scale and complexity of the power system are increasing, which carry out a lot of difficulty and effort to detailed simulation of the whole system, so effective dynamic equivalence is the premise of the modeling of electromagnetic transient simulation of large power systems. This paper targeting at the present situation of lack quantization standard in the dynamic equivalence, this paper took the posterior error criterion of grey forecasting model into the Dynamic Equivalence Evaluation, then proposed more detailed and exactly quantization standard appraisal index system, further perfect the error evaluation system of dynamic equivalence efficiency. © Published under licence by IOP Publishing Ltd.

关键词： Errors

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Impedance Network Modeling of GFL and GFM Converters System Considering AC/DC Couplings

Impedance Network Modeling of GFL and GFM Converters System ...

引用

IEEE International Conference on power and power and Renewable Energy (ICPRE)

作者： Kun Zheng Chao Luo Zhiyuan Sun Yihua Zhu Jiawei Yu Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Guangxi Power Grid Electric Power Research Institute China Southern Power Grid Nanning China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guang zhou China

ISBN: (数字)9798350377460

ISBN: (纸本)9798350377477

With the rapid development of grid-forming (GFM) control technology, integrating GFM control into grid-following (GFL) control-dominated systems has been attached with great importance due to the enhancement of grid supporting capability. To keep the normal operation of such GFL/GFM hybrid system, its small-signal stability needs to be studied, while the current research mainly focuses on the GFL/GFM converters' ac-side dynamics and usually ignore their ac/dc couplings. Therefore, this paper proposes an impedance network modeling method for GFL/GFM multi-converters system, and then a nodal admittance matrix retaining both ac and dc nodes is obtained. With such model, system marginal unstable condition can be accurately determined. Further, the influence of the capacity ratio between GFL and GFM converter is discussed. Simulation results of a typical GFL/GFM hybrid system verify the theoretical analysis.

关键词： Couplings Renewable energy sources grid following Simulation power system stability Stability analysis Admittance Impedance Matrix converters grid forming

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Active Support Technique for Flexibility and Stability of Multi-Partition power grid Based on Flexible DC control

Active Support Technique for Flexibility and Stability of Mu...

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power System and New Energy Technology Innovation Forum (NPSIF), Boao New power System International Forum -

作者： Huifan Xie Yongjie Luo Yinsheng Su Zhu Guo Guanghu Xu Peng Li Xiang Li Mengjun Liao Pengwei Sun Ziyou Li Yujun Xiao Power Dispatching and Control Center China Southern Power Grid Guangzhou China State Key Laboratory of Power Transmission Equipment Technology Chongqing University Chongqing China China Southern Power Grid South Power Grid Research Institute Guangzhou China

ISBN: (数字)9798331504557

ISBN: (纸本)9798331504564

Asynchronous operation of multi-partition power grid based on flexible DC interconnection will be the development trend of Southern power grid. In view of the fact that the existing flexible DC control techniques cannot meet the safety and stability requirements of flexible-DC-interconnected multi-partition power grid under the new power system, this paper studies active support technique for flexibility and stability of multi-partition power grid based on flexible DC control. It proposes control techniques regarding flexible power regulation, emergency power modulation, active voltage support, frequency synchronization, and stable operation of islanded power systems. The techniques have been successfully implemented in flexible DC engineering projects such as Ruxi, Central Guangdong and South Guangdong, greatly improving the economy, flexibility and stability of the partitioned power grid, and promoting the construction of a “reasonable partition, flexible interconnection, safe and controllable, open mutual support” main grid.

关键词： Reactive power Automatic frequency control Frequency modulation power system stability Market research power grids Regulation Steady-state Voltage control Frequency synchronization

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