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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Luo, Chuansheng Chen, Liangyuan Li, Rui Li, Hongshi Zhao, Jian Huang, Lei Nanning Power Supply Bureau Nanning China Electric Power Research Institute of Guangxi Power Grid Corporation Co. Ltd. Nanning China Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Nanning China

ISBN: (纸本)9789819613908

Due to the accumulation effect, the accumulation of small deformations in the transformer coil structure caused by each short-circuit impulse might result in the emergence of malfunctions or issues with the transformer. In this research article, a comprehensive investigation was undertaken to evaluate the cumulative deformation behavior of insulation paperboard utilized in coil structures. This was achieved by conducting a series of tests that simulated the impact force experienced during short-circuit events. The cumulative deformation characteristics of the insulation materials was obtained. The test sample was selected from a 2 mm insulating cardboard used for transformer coils, and a load loading test was conducted. The displacement generated by each group of impacts was recorded, and the influence of factors such as temperature, frequency, and short-circuit force amplitude on the cumulative deformation of insulation components was analyzed. Experimental results indicate significant cumulative deformation of insulating paperboard under multiple impacts, with deformation increasing with impact frequency. Deformation differs under varied pressures, evident in varying decrement rates on deformation-test curve. Elastic deformation varies under constant pressure, exhibiting cumulative effect. Under short-circuit impacts, cumulative deformation over extended periods was non-negligible. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Insulating materials

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Construction and Research of an intelligent Two-Order System

Construction and Research of an Intelligent Two-Order System

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作者： Huang, Chengwei Zeng, Jia Zhang, Fayan Zhang, Yubo Zhang, Wei Power Supply Bureau of Guangxi Hezhou Power Grid Co. Ltd. Hezhou China Guangxi Power Grid Co. Ltd. Nanning China Guangxi Key Laboratory of Intelligent Control and Operation and Maintenance of Power Equipment Electric Power Research Institute of Guangxi Power Grid Co. Ltd. Nanning China

The filling, review, execution and archiving management of two orders (operation order and work order) is one of the core businesses of on-site operation management of electric power enterprises. At present, the power grid management platform has developed the process and functions of two-order management and put them into application. However, from the perspective of the application status and analysis, there are still some problems that need to be solved urgently, such as lack of some core operation scenarios and incomplete two-order application functions. The intelligent two-order system effectively solves the current management situation of many non-standard and unqualified two orders, for instance, low efficiency of manual filling out operation orders and manual review by substation duty personnel, formalistic on-site safety investigation and safety technical disclosure of work orders for substations, and inconsistent writing requirements, thereby achieving the goal of effectively controlling the entire process risk of substation two-order management business from a three-dimensional, source-oriented, and transparent perspective. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Rectifier substations

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Lightning Impulse Breakdown Properties of a Long-Chain Modified Mono-Ester and Its Mixture with Soybean Oil as Alternative Liquid Dielectrics 11th

Lightning Impulse Breakdown Properties of a Long-Chain Modif...

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11th Frontier Academic Forum of Electrical Engineering, FAFEE 2024

作者： Han, Fangyuan Chen, Liangyuan Li, Bei Zhang, Yiyi Feng, Bo Yu, Min Electric Power Research Institute of Guangxi Power Grid Co. Ltd Guangxi Nanning530023 China Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Guangxi Nanning530023 China Guigang Power Supply Bureau of Guangxi Power Grid Co. Ltd Guangxi Guigang537100 China

ISBN: (纸本)9789819788279

Natural esters, as new environmentally friendly alternatives to conventional liquid insulation dielectrics, have been widely studied. However, their high viscosity and poor lightning impulse performance pose challenges to the structural design of transformers. In this work, a new type of long-chain fatty acid mono-ester (LAME) with low viscosity and high lightning impulse breakdown voltages (LI BDV) is *** shows similar positive LI BDV but significantly higher negative LI BDV when compared with soybean oil (SBO). The negative LI BDV of LAME is about 30% higher than that of SBO with a 65 mm gap. The negative LI BDV of the mixed insulation oil made from SBO and LAME is significantly higher than that of pure SBO. A nonlinear relationship between the negative LI BDV of the mixed insulation oil and the mixing ratio is observed. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Soybean oil

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Multi-Objective Coordination and Stability control of High Proportion Wind power System Based on K-Domain Tuning Damping 19th

Multi-Objective Coordination and Stability Control of High P...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Zhang, Qingtao Gao, Diju Zhang, Dan Cai, Haiqing Gu, Haohan Chen, Wei Wu, Wencong Chen, Zhihao Institute of Logistics Engineering Shanghai Maritime University Shanghai China Institute of Logistic Science and Engineering Shanghai Maritime University Shanghai China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9789819608966

With the further development of "double high" characteristics of power system, the traditional stability problem dominated by synchronous generator has gradually evolved into a new stability problem dominated by power electronic equipment control. In addition, different types of failure problems can occur in wind power systems. In order to achieve multi-objective coordinated and stable operation of high proportion wind power system, a damping control method with parameters tuning is proposed, which includes the design of filtering link and proportional amplification link. Among them, the key parameters of the proportional link are adjusted. Finally, the feasibility of the proposed control method is verified by simulation tests. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Electric power system stability

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Prediction of Transformer Winding Performance Under Short Circuit Impulse 19th

Prediction of Transformer Winding Performance Under Short Ci...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Xu, Shufeng Chen, Liangyuan Yu, Xiaobo Luo, Chuansheng Su, Zhengyuxi Huang, Lei Nanning Power Supply Burea Nanning530031 China Electric Power Research Institute of Guangxi Power Grid Corporation Co. Ltd. Nanning530023 China Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Nanning530023 China

ISBN: (纸本)9789819613823

This article introduces a transformer test prototype with a mouth-shaped iron core and a double-column structure. Each column contains three coils: low-voltage inner, high-voltage, and low-voltage outer. These two low-voltage coils can simulate the amplitude and axial deformation of real transformer coils. The article first uses simulations to predict the short-circuit withstand current and failure mode of windings under short-circuit impulse. Based on these results, tests were conducted on the model transformer to study the deformation and failure process of the two low-voltage coils. Multiple short-circuit impulse tests were conducted on the coils of the model transformer, during which the short-circuit impedance of the transformer were measured and analyzed. The experimental results show that the short-circuit impedance of the transformer increases monotonically with the increase of the number of shocks, and there will be a sudden increase in short-circuit impedance after a certain shock, indicating that irreversible permanent deformation has occurred at this time. The disassembly inspection of the model transformer after the experiment verified the experimental effect, indicating that the change rate of the transformer’s short-circuit impedance can effectively reflect the deformation of the coil, making it a comparatively effective method for predicting the transformer’s short-circuit resistance capability. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Transformer windings

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Mobile Observation Point Calculation and Meter Reading Based on the Digital Twin Model of Substations 24

Mobile Observation Point Calculation and Meter Reading Based...

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2024 International Conference on Industrial Automation and Robotics, IAR 2024

作者： Zhang, Yubo Zhang, Wei Lu, Yufeng Liu, Xu Huang, Chengwei Electric Power Research Institute of Guangxi Power Grid Co. Guangxi Key Laboratory of Intelligent Control and Operation and Maintenance of Power Equipment Guangxi Nanning China Electric Power Research Institute of Guangxi Power Grid Co. Guangxi Nanning China Southern Power Grid Research Institute Co. Ltd. Guangdong Guangzhou China Hezhou Power Supply Bureau of Guangxi Power Grid Co. Ltd. Guangdong Hezhou China

ISBN: (纸本)9798400711268

With the development of the power system, the number of substation equipment continues to increase, and the use of intelligent mobile robots to replace traditional manual inspection methods is a trend, which can improve inspection efficiency and stability, and reduce the operation and maintenance costs of substations. However, in the current mobile robot inspection process, to ensure that meter readings are not affected by factors such as lighting and the observation angle of the gimbal, operators need to pre-adjust the corresponding observation points for each device to be observed, resulting in a significant workload for debugging. To reduce the extensive debugging time invested by staff in the early stages, this paper proposes a method for robot meter reading without preset positions based on a digital twin model of the substation. The positions of equipment are marked in the digital twin model and sent to the mobile robot, which then calculates the optimal observation route autonomously. An RGBD camera is used to obtain the point cloud of the meter, and the normal vectors of the point cloud are extracted to calculate the corresponding optimal observation position and gimbal angle. Subsequently, image processing methods are employed to obtain the meter reading. Finally, the experiment results show that the proposed method can reduce the workload of manual debugging in substation inspection and improve the stability and accuracy of meter readings. © 2024 Copyright held by the owner/author(s).

关键词： Mobile robots

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An Effective Mesh Optimization Strategy for Oil Immersed Transformer Thermal Fluid Field Calculation 11th

An Effective Mesh Optimization Strategy for Oil Immersed Tra...

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11th Frontier Academic Forum of Electrical Engineering, FAFEE 2024

作者： Zhang, Lei Li, Rui Chen, Liangyuan Sun, Zhiyuan Electric Power Research Institute of Guangxi Power Grid Co. Ltd Guangxi Nanning530023 China Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Guangxi Nanning530023 China Guangxi Power Grid Equipment Monitoring and Diagnosis Engineering Technology Research Center Guangxi Nanning530023 China

ISBN: (纸本)9789819788279

A transformer thermal fluid field mesh optimization generation method based on the calculation results difference feedback is proposed. The number of meshes obtained by the local mesh refinement optimization based on the difference distribution feedback of results is 1.972 million, which is reduced to 72.7% of the number of meshes obtained based on the global refinement method. A temperature rise test platform is built in which the windings have embedded optical fiber temperature measurement system, and based on the test results under rated condition, the absolute errors between the calculated hot spots of HV and LV windings and the test values are 0.81% and 0.40%, respectively, which verify the effectiveness of the method. The thermal fluid field calculation mesh optimization generation method can reduce the number of calculation meshes while ensuring the calculation accuracy, and can provide a reference for mesh optimization control in transformer thermal fluid field calculation. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Mesh generation

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Research on Space/Interface Charge Characteristics of Natural Ester Oil-Paper Insulation Under Different Electric Field Strengths and Temperatures 11th

Research on Space/Interface Charge Characteristics of Natura...

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11th Frontier Academic Forum of Electrical Engineering, FAFEE 2024

作者： Chen, Liangyuan Han, Fangyuan Qin, Yekang Luo, Zongchang Li, Jianxin Electric Power Research Institute of Guangxi Power Grid Co. Ltd. Guangxi Nanning530023 China Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Guangxi Nanning530023 China Guigang Guiping Power Supply Bureau of Guangxi Power Grid Co. Ltd. Guangxi Guigang537200 China

ISBN: (纸本)9789819788231

The valve-side outing line device of converter transformer (CT) is composed of oil-impregnated paper and insulating oil channels. With the "green and low-carbon" transformation and development of the power industry, environmentally friendly natural esters witness more frequent use in CT. The space/interface charge problem is the key factor affecting the performance of the valve-side outing line insulation. In this work, a simulation model of a one-dimensional natural ester oil-paper insulation is established, and the characteristics of space/interface charge distribution evolution under different electric field strengths and temperatures are calculated. The simulation results show that within the range of simulation parameters, the steady-state space/interface charge density will increase with an increase in either electric field strength or temperature, and the variation of electric field strength will affect the time when the space/interface charge density reaches the steady state. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Oil filled transformers

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Thermal Cracking Gas Production Characteristics of Multi-component Mixed Oil 19th

Thermal Cracking Gas Production Characteristics of Multi-com...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Fu, Guofeng Qin, Yekang Zhang, Hanting Liu, Ying Zeng, Fengna Han, Fangyuan Guigang Power Supply Bureau Guangxi Power Grid Co. Ltd. Guangxi Guigang537100 China State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering Chongqing University Chongqing400044 China Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Guangxi Nanning530023 China

ISBN: (纸本)9789819613823

Investigating the gas production characteristics of insulation oil thermal cracking at the atomic level is of great significance for transformer fault diagnosis and condition assessment based on dissolved gas analysis. This paper simulates the thermal cracking kinetics of multi-component mixed oil using molecular dynamics, analyzing the gas production characteristics of modified natural esters and multi-component mixed oil at different temperatures. The results show that during the thermal cracking of multi-component mixed oil, C2H4 is generated in large quantities at various temperatures and is the most abundant characteristic gas. The content of H2, CO, CH4, C2H2, and C2H6 gradually increase with rising temperature, while CO2 is the first gas to be produced and tends to saturate. The contents of H2, CH4, C2H2, and C2H4 show significant trends with temperature changes and can be used as key characteristic gases for diagnosing faults and conditions of multi-component mixed oil transformers. This finding provides guidance for developing maintenance strategies for transformers using multi-component mixed oil. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Cracking (chemical)

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Small Signal Stability-Guaranteed Moving Target Defense Against Load Redistribution Attack On IoT-based Smart grid

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IEEE Internet of Things Journal 2025年第11期12卷 17413-17429页

作者： Wang, Bingdong Zhang, Zhenyong Wang, Mufeng Liu, Mengxiang Ye, Rui Deng, Ruilong Zhang, Xin Guizhou University State Key Laboratory of Public Big Data College of Computer Science and Technology Guiyang550025 China China Industrial Control Systems Cyber Emergency Response Team Beijing100040 China University of Sheffield Department of Automatic Control and System Engineering Sheffield United Kingdom Guizhou Power Grid Co. Ltd. Intelligent Operation Center China Zhejiang University State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Hangzhou310027 China Huzhou Institute of Industrial Control Technology Huzhou313000 China

Moving target defense (MTD) is a promising approach to defend against load redistribution attacks on the internet-of-things (IoT)-based smart grid networks by probing the distorted state estimates with the distributed flexible AC transmission system. However, existing studies mainly focus on optimizing the performance of MTD and ignore the safety effect of it on the system’s operation. In this paper, we fill this gap by deeply analyzing the effect of MTD on the small signal stability and aim to alleviate the negative impact and guarantee its defending performance simultaneously. Firstly, the stability is formally described using the eigenvalue sensitivity. The relationship between the MTD-induced perturbation (MTDper) and the stability criteria is derived. Secondly, a new indicator is proposed to measure the effectiveness of MTDper. Thirdly, a constrained optimization problem is formulated to compute the bound of MTDper for guaranteeing the small signal stability. In addition, a surprising finding is that the stability margin can be improved and enhanced by optimizing the value of MTDper without losing the MTD’s effectiveness. Finally, we evaluate the performance of MTDper and its impact on the small signal stability with extensive simulations on the IEEE 30-bus, 39-bus, and 68-bus test power systems. © 2014 IEEE.

关键词： Constrained optimization

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