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检索条件"机构=Science and Technology Projects of China Southern Power Grid"

共 535 条记录，以下是91-100 订阅

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An Engineering Approach for Short-Circuit Current Calculation Considering WTG Integrated

An Engineering Approach for Short-Circuit Current Calculatio...

引用

2023 International Conference on power Energy Systems and Applications, ICoPESA 2023

作者： Dong, Yiran Shi, Hengchu Kong, Dezhi You, Hao Chen, Jing Xu, Shoudong Chen, Jinfu Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Yunnan Electric Power Dispatching and Controlling Center China Southern Power Grid Kunming China Scientific Research Institute of Yunnan Power Grid System Analysis Department Kunming China

ISBN: (纸本)9798350345605

With the ever-increasing scale of wind power, the fault characteristics of power grids have changed dramatically, and the existing relay setting calculation approaches can no longer meet the requirements of modeling. The wind turbine generator (WTG) is usually treated as constant current source or set to zero to adapt to the traditional short-circuit current calculation software. This method does not consider the fault characteristics of the WTG, so the calculation accuracy is lower than that of iteration. However, the iterative algorithm also has problems, such as non-convergence or too many iterations leading to long computation time. Therefore, a calculation method of short-circuit current considering WTG integrated is proposed in this paper, which can solve the problem of iteration non-convergence while ensuring accuracy within the allowable range of engineering. Firstly, the WTG short-circuit current models considering converter control strategy and fault characteristics are established. Then, the branches with WTG are converted into "constant potential source + equivalent impedance"to facilitate WTG embedding in the relay protection setting calculation software and maintain consistency with the traditional synchronous generator equivalent mode. In addition, the calculation formula of equivalent impedance is deduced, and the modified voltage is also proposed to improve the accuracy. Finally, a simulation is performed in GIRGE B4-39 and part of actual power grids structures in a province to verify engineering practical value of the proposed method. © 2023 IEEE.

关键词： Short circuit currents

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Research on Key Technologies of Digital Twin for Electrical power Communication Network

Research on Key Technologies of Digital Twin for Electrical ...

引用

2023 International Conference on Cryptography, Network Security, and Communication technology, CNSCT 2023

作者： Li, Can Chen, Can Li, Yang Li, Li Yang, Xuelian Li, Jia State Grid Information & Telecommunication Branch Beijing100761 China Beijing Kedong Electric Power Control System Co. Ltd Beijing100192 China Science and Technology Projects of State Grid Information & Telecommunication Branch China

ISBN: (数字)9781510664951

ISBN: (纸本)9781510664944

As the main infrastructure of the power grid, the electrical power communication network has an urgent need for digitalization, and the digital twin technology can support the digital operation of various services of the electrical power communication network. Based on the actual production needs of electricity, this paper divides the digital twin system into five layers: the physical layer, data perception layer, data governance layer, functional model layer, and model application layer. In order to achieve practical application, the five-layers model is studied based on actual cases, and then the key technologies required to build a digital twin model are introduced. Finally, two examples of optical cable resource management and intelligent analysis of communication power failure and remote management are shown. © 2023 SPIE.

关键词： Life cycle

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Experimental studies of anodized Al surface with composite nanopore structures to enhance the anti-icing properties of transmission lines 2

Experimental studies of anodized Al surface with composite n...

引用

2024 2nd International Conference on Materials science and Intelligent Manufacturing, MSIM 2024

作者： Li, Bo Jie, Bai Fan, Lei Zeng, Huarong Mu, Hao Dai, Xu Xiao, Jie Hua, Xujiang Li, Qi Yuan, Yuan Liao, Ruijin Institute of Electric Power Science of Guizhou Power Grid Co. Ltd. Guiyang550499 China China Southern Power Grid Joint Laboratory of Anti-icing and Disaster Reduction Guiyang550499 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China College of Materials Science and Engineering Chongqing University Chongqing400044 China

Anti-icing is crucial for transmission conductors to avoid long-term power outages caused by severe icing climates. Here, superhydrophobic aluminum conductors with composite honeycomb nanopore structures were prepared by the twice-anodic oxidation method. Effects of the anodized current density on the surface morphology, structure, hydrophobicity, and anti-icing performance were experimentally studied. As the current density increases, the film thickness of the lower layer of a small nanopore structure increases, while the dissolution effect on the upper layer of a large nanopore structure is strengthened. Also, the composite nanopore structure exists in the damaged condition and has a rougher surface at the micron level. By comparing the surface wettability and anti-icing performance of all samples, the sample under the current density of 0.01875A/cm2 showed the optimal anti-icing properties, including a contact angle (CA) of 168°, the ice adhesion force of 4.87 kPa, and the longest frost formation time. The good anti-icing performance makes the anodized aluminum of composite nanopore structures a satisfactory candidate for improving their anti-icing behavior in the industry. © Published under licence by IOP Publishing Ltd.

关键词： Hydrophobicity

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Dynamic Inertia Modeling and Evaluation of PMSG-Based Wind Turbine with df/dt Inertia Control 26

Dynamic Inertia Modeling and Evaluation of PMSG-Based Wind T...

引用

26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Hu, Bo Zhu, Donghai Yu, Jiawei Zhu, Yihua Li, Chengxiang Li, Le Zou, Xudong Kang, Yong Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan China Electric Power Research Institude China Southern Power Grid State Key Laboratory of Hvdc Guangzhou China

ISBN: (纸本)9798350317589

The df/dt inertia control is a widely-used strategy for enhancing the inertia of the permanent-magnet synchronous generator (PMSG)-based wind turbines (WTs). However, the complex control coupling makes the inertial dynamics of the PMSG-based WTs with df/dt inertia control unclear. To address this issue, this paper first establishes the magnitude-phase motion model and verifies the accuracy of the model. Then, in analogy to the swing equation of synchronous generator (SG), the dynamic inertia is derived from the established model. On this basis, the impacts of the controllers on the inertia are analyzed. Finally, the analysis results are verified by MATLAB/Simulink simulation. © 2023 IEEE.

关键词： Wind turbines

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power Transformer Fault Diagnosis Method Based on Machine Learning

Power Transformer Fault Diagnosis Method Based on Machine Le...

引用

2022 International Conference on Cyber-Physical Social Intelligence, ICCSI 2022

作者： Zou, Dexu Xiang, Yongjian Peng, Qingjun Wang, Shan Shi, Yong Hong, Zhihu Dai, Weiju Zhou, Tao Electric Power Research Institute China Southern Power Grid Yunnan Power Grid Co. Ltd. Kunming China School of Automation Nanjing University of Science and Technology Nanjing China China Southern Power Grid Yunnan Power Grid Co. Ltd. Kunming China

ISBN: (数字)9781665498357

ISBN: (纸本)9781665498357

Transformer is one of the most important power equipment in power systems. The normal operation of transformers is of great importance for the safety and stability of power grids. Therefore, transformer fault monitoring and diagnosis are very important to ensure the stability of power system. This paper summarizes the existing methods for transformer diagnosis. The traditional methods have some apparent disadvantages and limitations. These methods deal with static data and cannot be mapped to the objects at any time. This may cause a untimely detection and a big error. Therefore, a data-driven transformer fault diagnosis method is introduced to solve these problems. The paper summarizes the applications of expert learning, artificial neural network, support vector machine, deep learning and other machine learning methods in transformer fault diagnosis with the advantages and disadvantages of each method analyzed. And This paper summarizes the contribution of machine learning in transformer fault diagnosis. Finally, the paper summarizes and prospects the development of transformer fault diagnosis methods. © 2022 IEEE.

关键词： Failure analysis

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Transformer Short Circuit Detection Methods and Improvement of Anti-short Circuit Ability Based on Digital Twin technology: A Survey

Transformer Short Circuit Detection Methods and Improvement ...

引用

2022 International Conference on Cyber-Physical Social Intelligence, ICCSI 2022

作者： Zou, Dexu Gu, Yuanzhe Peng, Qingjun Shi, Yong Wang, Shan Dai, Weijiu Hong, Zhihu Quan, Hao Electric Power Research Institute China Southern Power Grid Yunnan Power Grid Co. Ltd. Kunming China School of Automation Nanjing University of Science and Technology Nanjing China China Southern Power Grid Yunnan Power Grid Co. Ltd. Kunming China

ISBN: (数字)9781665498357

ISBN: (纸本)9781665498357

Transformer is one of the most important equipments in the power system, and its stability is the basic guarantee for the safe operation of the system. This paper first describes the calculation method of the magnitude of the overcurrent, the leakage magnetic field and the electric power generated by electromagnetic coupling during the short circuit of the transformer. The existing analysis and calculation of the leakage magnetic field and electromagnetic force generally use the finite element integration method to solve the dynamic modeling of the short circuit of the transformer. Secondly, the transformer short-circuit monitoring scheme based on the principle of transformer internal electromagnetic and winding vibration is described: low-voltage pulse method, short-circuit impedance method and frequency response method, and some emerging schemes derived from these three methods, which have high accuracy but are mostly offline monitoring. Finally, the concept of transformer online monitoring based on digital twin (DT) technology is proposed. The DT modeling and monitoring prediction of transformer are carried out by four core technologies of data acquisition, data management, model construction and DT platform constructed with IoT as the carrier of human-computer interaction. © 2022 IEEE.

关键词： Frequency response

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Research on Digital Twins technology and Its Future Implementation in Transformer Overload Analysis

Research on Digital Twins Technology and Its Future Implemen...

引用

2022 International Conference on Cyber-Physical Social Intelligence, ICCSI 2022

作者： Zou, Dexu Zhang, Zhirui Peng, Qingjun Wang, Shan Shi, Yong Hong, Zhihu Dai, Weiju Quan, Hao Electric Power Research Institute China Southern Power Grid Yunnan Power Grid Co. Ltd. Kunming China School of Automation Nanjing University of Science and Technology Nanjing China China Southern Power Grid Yunnan Power Grid Co. Ltd. Kunming China

ISBN: (数字)9781665498357

ISBN: (纸本)9781665498357

Overload is a common failure in substation operation. However, for large-capacity oil-immersed transformers which invariably operate at a voltage class of above 110kV, it is difficult to directly measure the hot spot temperature to avoid problems caused by abnormal temperatures considering their more complex internal structure. In recent years, digital twin technology has flourished, which now allows many industries to see its intelligent restructuring. This article discusses the cause, mechanism, and effects of transformer overload and how we can use digital twins technology to achieve comprehensive monitoring and fault analysis in transformer operation. © 2022 IEEE.

关键词： Electric substations

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Nonlinear Analytical Model of Large-Scale Doubly-Fed Induction Generator-Motor Based on Coefficient Transfer

Nonlinear Analytical Model of Large-Scale Doubly-Fed Inducti...

引用

2024 International Conference on Electrical Machines, ICEM 2024

作者： Sun, Lu Wang, Jin Ma, Yiming Kang, Haoyu Li, Zequan Zhou, Libing Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan China CSG PGC Energy Storage Research Institute China Southern Power Grid Energy Storage Co.Ltd Guangzhou China

ISBN: (纸本)9798350370607

In the variable speed pumped storage unit, the doubly-fed induction generator-motors (DFIGMs) often operate in the high saturation region within power control due to the extensive speed range. To address the issue of motor saturation effect analysis and enhance the calculation accuracy for various operating conditions, this paper proposes a high-saturation analytical calculation method for DFIGMs based on model coefficient transfer learning to analyze the electromagnetic characteristics under extreme operating conditions. The unsaturated condition source domain data were obtained by constructing an accurate subdomain model. Fourier transform was applied to decompose the air gap magnetic density obtained from both the analytical model and finite element model respectively, to achieve precise correction of undetermined coefficients for each harmonic. Consequently, a highly accurate and efficient analytical calculation model for DFIGMs under high saturation was developed. The harmonic and torque characteristics of 10 MW DFIGMs under overload conditions are analyzed based on the model. Subsequently, an experimental test is conducted on a prototype to validate the accuracy of the analytical transfer model. © 2024 IEEE.

关键词： Asynchronous generators

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AC Loss Evaluation of a Toroidal D-Shaped 10 MJ Superconducting Magnet

AC Loss Evaluation of a Toroidal D-Shaped 10 MJ Superconduct...

引用

2023 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2023

作者： Li, Li Song, Meng Long, Feiyang Xu, Ying Ren, Li China Southern Power Grid Company Ltd Joint Laboratory on Power Superconducting Technology Guangzhou China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350301571

A 10 MJ HTS SMES designed for power system voltage compensation and active-reactive power regulation applications is under construction. The system aims to complete 10MJ charging or discharging in 2s time, so it is crucial to analyze its AC losses. In this paper, the AC loss of the magnet is analyzed by the dimensional reduction inversion method, and the AC loss of the magnet for one complete working cycle is obtained to be about 72 KJ, which provides a reference for the design of the cooling system of SMES. © 2023 IEEE.

关键词： AC loss HTS magnet toroid

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Analytical Model for Magnetic Field of Toroidal D-Shaped HTS Magnet

Analytical Model for Magnetic Field of Toroidal D-Shaped HTS...

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2023 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2023

作者： Song, Meng Li, Li Qiu, Yifeng Ren, Li Xu, Ying China Southern Power Grid Company Ltd Joint Laboratory on Power Superconducting Technology Guangzhou China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350301571

The electromagnetic computation complexity of large-scale three-dimensional superconducting magnets is extremely high, posing significant challenges for optimizing their design. In this paper, an analytical model for the magnetic field of toroidal D-shaped high-temperature superconducting (HTS) magnets is developed based on the assumptions of uniform current distribution and the vector potential's Poisson equation. A comparison with results obtained using the H-formulation reveals that the assumption of uniform current distribution introduces acceptable errors in the magnetic field. To expedite calculations while maintaining precision, the discrete integration method is adopted, providing computation speeds that are two to three orders of magnitude faster than the finite element method (FEM). This model can be applied for calculating parameters such as center magnetic field and critical current, thereby enhancing the efficiency of electromagnetic design for superconducting magnets. © 2023 IEEE.

关键词： HTS magnets magnetic field calculation toroidal D-shaped magnets

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