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2020 IEEE Sustainable power and Energy Conference, iSPEC 2020

作者： Cao, Yongji Zhang, Hengxu Li, Changgang Sun, Leshu Li, Chen Qin, Hao Guo, Qi Zhu, Yihua Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan250061 China State Key Laboratory of HVDC Electric Power Research Institute National Energy Power Grid Technology RD Centre Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou510663 China

ISBN: (纸本)9781728191645

As thermal generators are substituted by renewables, the power reserves are decreasing and the influence of boiler thermal states on frequency dynamics becomes more severe. The variations of thermal states can aggravate dynamic frequency response, especially for power systems with high renewables. However, the system frequency response (SFR) model has been widely adopted, but in which the thermal states are neglected. This paper analyzes the influence of thermal states on dynamic frequency response quantitatively. The modified SFR models are built by extending the boiler models with different simplification degrees. Then, from the view of the response amplitude and time, the quantitative indices are established to measure the response trajectories of modified SFR models. And the characteristics of frequency dynamics and the statistic indices of data sequences are utilized to analyze the influences of thermal states and assess the performances of modified SFR models. According to the results of comparative analysis, the neglect of thermal states incurs more optimistic frequency dynamics and impairs the frequency stability of power systems with high renewables. Additionally, the accuracy of the SFR model can be enhanced even with the most simplified boiler model. © 2020 IEEE.

关键词： Frequency response

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Closed-loop Simulation Method of Stability Control system Based on Virtual Component technology 6

Closed-loop Simulation Method of Stability Control System Ba...

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

作者： Ma, Qinfeng Zhu, Yihua Liu, Mingshun Chang, Dongxu Pu, Qingxin Li, Chengxiang Power Dispatching Control Center of Guizhou Power Grid Co. Ltd Guizhou China Southern Power Grid State Key Laboratory of HVDC Electric Power Research Institute China Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou China China Southern Power Grid CSG Key Laboratory for Power System Simulation Electric Power Research Institute Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China

ISBN: (纸本)9798350347159

The stability control system is an important means to ensure the safe and stable operation of the power system. In view of the shortcomings of the existing offline/real-time simulation test methods, a closed-loop simulation scheme based on virtual component technology is proposed. The virtual component technology of the stability control device is researched, and the virtualization method of the external hardware interface of the device is designed. On this basis, a closed-loop simulation framework of the stability control system under the offline/real-time simulation test environment is proposed. The functional logic of each component under the framework are analyzed. The calculation and feedback process of the entire closed-loop simulation system are analyzed in depth, which effectively solves the difficulty of simulation analysis and test verification of large-scale stability control system, providing a new method for the research and verification of stability control system strategy. © 2022 IEEE.

关键词： Control system stability

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Study on Corrosion Failure Characteristics of Silicone Rubber in Acidic Environment 3

Study on Corrosion Failure Characteristics of Silicone Rubbe...

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3rd International Conference on Electrical Materials and power Equipment, ICEMPE 2021

作者： Ma, Xiaodan Zhang, Zhijin Ma, Xiaohong Huang, Huan Jiang, Xingliang Chongqing University State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing China Power Research Institute of Guizhou Power Grid Co. Ltd State Grid Guizhou China

ISBN: (纸本)9781665418409

In order to grasp the corrosion failure characteristics of silicone rubber in an acidic environment, an artificial mist box was used to artificially simulate the corrosion conditions acting on the silicone rubber, and the changes in its surface characteristics were analyzed. The research results show that under the combined action of acid mist and electric field, the physical and chemical properties of composite insulators have declined. There are holes and cracks on the surface, and the hardness increases with the corrosion time. Before flashover, if there is no obvious discharge in the withstand voltage process, the contact angle, relative dielectric constant and absorption peak area change little with the increase of corrosion time. The analysis shows that the damage rate of large-area corrosion of silicone rubber is very slow. Acidic substances will cause the main chain and side chains of the silicone rubber to break, and the aluminum hydroxide in the silicone rubber also reacts with strong acids, resulting in the destruction of the structure of the silicone rubber. The physical and chemical properties are reduced. © 2021 IEEE.

关键词： Electric fields

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Research on 220kV Spare power Automatic Switching Equipment Standardized Application of Local functions Based on Real-Time Simulation∗ 5

Research on 220kV Spare Power Automatic Switching Equipment ...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Huang, Zhida Wu, Wencong Cai, Haiqing Zhu, Yihua Huang, Libin Chang, Dongxu State Key Laboratory of Hvdc Electric Power Research Institute Csg National Energy Power Grid Technology R&d Centre Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Csg Key Laboratory for Power System Simulation Guangzhou China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

Currently, the power grid is carrying out the standardized design and application of 220kV spare power automatic switching equipment. It is more difficult to carry out the on-site standby automatic switching function test in the actual power grid. The power supply department urgently needs a simulation environment that can truly simulate the actual power grid to support the development of this functional test. Real-time simulation has the ability to carry out on-site automatic transfer function tests in terms of technical feasibility. To verify its effectiveness, this paper built a standardized closed-loop test system for 220kV spare power automatic switching equipment based on real-time simulation. A number of tests have been carried out for the automatic switch-on function of on-site equipment, and the device action events on the actual site have been inverted. The test results show that the established RTDS real-time simulation model has the ability to simulate the actual 220kV power grid. It has been verified that the action logic of the standby automatic input device in various modes meets the requirements of the standard specification, which strongly supports the standardized application of the 220kV spare power automatic switching equipment function of the power grid. © 2022 IEEE.

关键词： Switching

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Characteristics of Glass Insulator Hot Water Deicing 3

Characteristics of Glass Insulator Hot Water Deicing

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3rd International Conference on Electrical Materials and power Equipment, ICEMPE 2021

作者： Ma, Xiaohong He, Bingzhe Zhang, Zhijin Yang, Qi Zhang, Lusong Huang, Huan Electric Power Research Institute State Guizhou Power Grid Co. Ltd Guizhou China Chongqing University State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing China Electric Power Research Institute Guizhou Power Grid Co. Ltd Guizhou China

ISBN: (纸本)9781665418409

Hot water is a kind of deicing medium with wide sources, and the impact force of its ejection is easy to control to avoid damaging the surface of glass insulator. In order to reveal the influencing factors of hot water deicing and their effect on the deicing time of glass insulator, an experiment was conducted where LXY-120 glass insulator was selected to measure the hot water deicing time under different circumstances. The results show that initial water temperature has significant effect on deicing time. At certain range, deicing time can be greatly reduced as initial water temperature increases, and it also affects deicing time increasement caused by heavier ice weight. Ejection distance and outlet pressure both have near linear relation with deicing time. It concluded that when conducting hot water deicing, on the premise of ensuring safety distance, shortening deicing distance, optimizing outlet pressure and initial water temperature can improve the ice melting efficiency. © 2021 IEEE.

关键词： Snow and ice removal

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Visualization of CNN Transient Voltage Classification Based on Feature Recognition and Enhancement

Visualization of CNN Transient Voltage Classification Based ...

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2021 IEEE Sustainable power and Energy Conference, iSPEC 2021

作者： Li, Zhendong Liu, Yutian An, Jun Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Jinan China Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control Renewable Energy Technology Ministry of Education Jilin China

ISBN: (纸本)9781665414395

The deep learning algorithm represented by CNN has achieved remarkable results in complex feature extraction, classification and regression. Since the CNN adopts an end-to-end training process, the carrier of acquisition knowledge is a high-dimensional non-linear function, which is hard to understand by humans. Therefore, it is difficult to be widely used in online decision-making engineering scenarios such as the fast assessment of power system transient voltage stability. In this paper, the key input elements extracted by CNN are identified by Grad-CAM, and the key features captured by CNN in the assessment process are enhanced based on AM, so as to finally obtain the visual expression of key areas and variables of the original input data. Besides, a sample construction method based on single line diagram is proposed to improve the visualization effect of Grad-CAM and AM. Simulation results and analyses of IEEE 39bus test system demonstrates the effectiveness of the proposed method. © 2021 IEEE.

关键词： Visualization

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A Digital Twin Framework for Transient Stability Assessment Based on Knowledge Distillation 9

A Digital Twin Framework for Transient Stability Assessment ...

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9th Asia Conference on power and Electrical Engineering, ACPEE 2024

作者： Cui, Junjie Qin, Wenping Zhu, Zhilong Lu, Ruipeng Qin, Penghui Li, Xianzhen Taiyuan University of Technology Key Laboratory of Cleaner Intelligent Control on Coal & Electricity Ministry of Education Shanxi Key Laboratory of Power System Operation Control College of Electrical and Power Engineering Taiyuan China

ISBN: (纸本)9798350309638

In the context of the digital transformation of power systems, various new sensors are capable of acquiring massive real-time data from the power grid, providing an opportunity for the development of digital twins in power systems. This paper proposes a transient stability assessment digital twin framework based on knowledge distillation. Addressing the challenges of high computational resource consumption and model deployment difficulties associated with existing high-precision complex models in transient stability assessment, the knowledge distillation method is introduced for model lightweighting. Simultaneously, the proposed continuous learning online updating strategy enables adaptive online updates for complex operating conditions and structures, enhancing the learning capability for online additions of diverse samples. Using Transformer as the transient stability assessment model, the effectiveness of the proposed approach was validated on the IEEE 39-bus system. © 2024 IEEE.

关键词： Distillation

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Natural image matting based on image inpainting 2

Natural image matting based on image inpainting

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2nd International Conference on Computer Graphics, Image and Virtualization, ICCGIV 2022

作者： Zhang, Yuan Tan, Mian Zhou, Zhulian Yang, Yuan Liang, Yihui Feng, Fujian Guizhou Minzu University Guizhou Key Laboratory of Pattern Recognition and Intelligent System Guiyang550025 China University of Electronic Science and Technology China School of Computer Science Zhongshan528400 China

ISBN: (纸本)9781665492508

Deep image matting is a hot problem with applications in computer vision and image processing. It has been widely used in image composition, film production and video editing etc. The current matting method based on image inpainting uses a deep neural network to inpaint the foreground target and background region to further improve the accuracy of alpha matte. However, when the trimap contains large unknown regions, the excessive inpainting of foreground and background produce a lot of redundant information, which leads to a degradation of alpha matte quality. Therefore, to address this issue, a natural image matting method based on image inpainting is designed. This method involves the refinement process for trimap, which improves the quality of the trimap, enlarges the foreground and background regions providing additional information for image matting. Extensive experimental results on the composition-1k dataset demonstrate that the presented method provide high-quality alpha mattes not only in the case that the trimap contains small unknown regions, but also in the case that the trimap contains large unknown regions. © 2022 IEEE.

关键词： Deep neural networks

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Effect of Battery Energy Storage system Frequency Regulation on Frequency Characteristic of power systems

Effect of Battery Energy Storage System Frequency Regulation...

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2022 IEEE International Conference on power systems and Electrical technology, PSET 2022

作者： Deng, Lijun Huang, Libin Cai, Haiqing Hu, Yun Liao, Mengjun Huang, Yunhui China Southern Power Grid Research Institute Co. Ltd Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China Wuhan University of Technology Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Wuhan China

ISBN: (纸本)9781665489157

This paper investigates the impact of battery energy storage system (BESS) frequency regulation on frequency characteristic of power systems. To begin with, a model of BESS participating in frequency regulation of power systems is established for analyzing effects of BESS control dynamics on grid frequency characteristic. And the analysis model is proved by comparison with time domain model. Furthermore, grid frequency characteristic analysis with including BESS frequency regulation is studied. Virtual inertia control and virtual inertia frequency control of BESS are investigated for Participate in power grid frequency regulation. Finally, Influence of energy storage inertia and primary frequency regulation control on system frequency characteristics are investigated in Matlab/Simulink. © 2022 IEEE.

关键词： Battery storage

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Cavitation of a Submerged Jet at the Spherical Valve Plate/Cylinder Block Interface for Axial Piston Pump

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Chinese Journal of Mechanical Engineering 2020年第5期33卷 197-211页

作者： Bin Zhao Weiwei Guo Long Quan College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China Transducers and Intelligent Control System of Ministry of Education and Shanxi Province Taiyuan University of TechnologyTaiyuan 030024China The State Key Laboratory of Fluid Power&Mechatronic Systems Zhejiang UniversityHangzhou 310027China

The spherical valve plate/cylinder block pair has the advantages of strong overturning resistance and large bearing ***,the configurations of the unloading and pre-boosting triangular grooves on the spherical valve plate are different from those in the planar valve plate,resulting in special cavitation phenomenon on the spherical port plate *** order to study cavitation characteristics of spherical port plate pair,a dynamic CFD model of the piston pump including turbulence model,cavitation model and fluid compressibility is established.A detailed UDF compilation scheme is provided for modelling of the micron-sized spherical oil film mesh,which makes up for the lack of research on the meshing of the spherical oil *** this paper,using CFD simulation tools,from the perspectives of pressure field,velocity field and gas volume fraction change,a detailed analysis of the transient evolution of the submerged cavitation jet in a axial piston pump with spherical valve plate is carried *** study indicates the movement direction of the cavitation cloud cluster through the cloud image and the velocity vector direction of the observation *** sharp decrease of velocity and gas volume fraction indicates the collapse phenomenon of bubbles on the part wall *** discoveries verify the special erosion effect in case of the spherical valve plate/cylinder block *** submerged cavitation jet generated by the unloading triangular grooves distributed on the spherical valve plate not only cause denudation of the inner wall surface of the valve plate,but also cause strong impact and denudation on the lower surface of the cylinder ***,the direction of the unloading triangular groove was modified to extend the distance between it and the wall surface which can effectively alleviate the erosion effect.

关键词： Cavitation submerged jet Spherical valve plate/cylinder block pair Axial piston pump

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