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Surface charge inversion algorithms based on integral equation method

High Voltage 2024年第5期9卷 1101-1114页

作者： Kang Ma Fangcheng Lv Shenghui Wang Huaqi Liu State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijingChina 2Beijing Sifang Automation Co.Ltd.BeijingChina State Grid Henan Electric Power Company Luoyang Power Supply Company LuoyangHenanChina

Accurate surface charge inversion can guide the research on surface modification of insulators in GIS/*** current inversion algorithms have disadvantages of high computational cost and low *** on that,the integral equation method(IEM)is proposed to calculate the transformation *** with the traditional analytical method(AM),IEM has a simple calculation *** calculation speed of IEM is much faster than that of *** suppress the numerical divergence in IEM,the Tikhonov regularisation method is introduced and Tikhonov-IEM is *** square insulators,compared to IEM,the peak-mean square error(PMSE)is reduced by about 40 ***,Tikhonov-IEM is not suitable for basin ***,the least square method(LSM)is introduced and the LSM-IEM is *** basin insulators,compared to IEM,the PMSE is reduced by about 30 ***,the accuracy of the algorithms is verified by physical tests.

关键词： process. charge equation

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Defect recognition of oil-pressboard insulation based on frequent arc reignition phenomenon under switching impulse voltage

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High Voltage 2024年第4期9卷 773-785页

作者： Simeng Li Yukun Zhang Yunfei Jia Shengchang Ji Yanhua Han Wensen Wang State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi'an Jiaotong UniversityXi'anChina State Grid Shaanxi Electric Power Research Institute Xi'anChina

In the past three years,a number of oil-immersed ultra-high-voltage shunt reactors have experienced discharge defects when being put into operation,resulting in an overload of ***,detecting and identifying these discharge defects caused by switching impulse voltage is challenging under steady-state *** poses unpredictable and difficult-to-assess safety risks for the longterm operation of the equipment and subsequent transient ***,comprehending the discharge behavior of oilpressboard(PB)insulation under switching impulse voltage and devising a method to identify defects becomes *** study focuses on investigating the frequent arc reignition(FAR)pattern exhibited by typical defects under both standard and oscillation switching impulse *** objective is to uncover the mechanism behind FAR and propose a defect recognition strategy suitable for transient *** study reveals the FAR process will occur at least once during the breakdown process;the FAR phenomenon is the weakest in the surface defect with a weak vertical electric *** average recovery voltage percentage and the average discharge interval of the FAR process decrease with increasing impulse amplitude or oscillation ***,the average number of discharges decreases with higher oscillation frequency,while it initially increases and then decreases with increaseing *** on the analysis of the number of FAR processes and their variation in terms of amplitude or discharge interval,a method for recognizing oil-PB defects during switching transient processes is developed and successfully applied to a case study involving acetylene overload in a 1000 kV shunt reactor.

关键词： field insulation oscillation

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Audible Noise Performance of High Voltage AC Conductor Bundles at an Altitude of 226lm

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CSEE Journal of power and Energy Systems 2023年第6期9卷 2447-2455页

作者： Wangling He Baoquan Wan Shilong Huang Yunpeng Liu Jiangong Zhang Xiao Han North China Electric Power University Baoding 071000China China Electric Power Research Institute(State Key Laboratory of Power Grid Environmental Protection) Wuhan 430074China

Extra or ultra-high voltage transmission lines can exhibit strong corona discharge and generate severe audible noise(AN)at high altitudes,which has become a critical limiting factor for power lines ***,the AN data of bundle conductors at high altitudes are very rare,which cannot adequately support the power utilities to make reasonable conductor *** this paper,a sound pressure level(SPL)of 14 types of bundle conductors is investigated by using an ultra-high-voltage(UHV)corona cage(8 m×8 m×35 m)at an altitude of 2216 m,where the bundle numbers between 4 and 12 and the conductor types are used in 500 kV,750 kV or 1000 kV power transmission *** a large number of valuable AN data are obtained;the influences of bundle numbers and sub-conductor diameters on an acoustic power density level(LPWL)are analyzed;and an A-weighted LPWL calculation method is *** addition,by comparing the AN data obtained from the low-altitude area(altitude:23 m),the AN altitude correction factor is concluded,and the influences of conductor parameters and the surface electric field strength on correction factors are *** results obtained in this paper can provide important data for the construction of high-altitude AC power lines.

关键词： AC power lines audible noise corona discharge high altitude

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Unified grid-Forming Control for MMC-MTDC Systems with Renewable power Integration 6

Unified Grid-Forming Control for MMC-MTDC Systems with Renew...

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6th International Conference on HVDC, HVDC 2024

作者： Yang, Renxin Cai, Haiqing Su, Mingzhang Gu, Haohan Chen, Zhihao Cai, Xu Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Shanghai China Electric Power Research Institute China Southern Power Grid State Key Laboratory of Hvdc Guangzhou China National Energy Power Grid Technology R&d Centre China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System China Southern Power Grid Guangzhou China

ISBN: (纸本)9798350387759

Using modular multilevel converter-based multi-terminal high voltage direct current (MMC-MTDC) transmission to integrate large-scale renewable power into the main power grid is an important development trend in china. To cope with the stability issues under weak grid conditions, different grid-forming control strategies have been proposed for the MMC in MTDC transmission systems. These control strategies have different structures due to different control targets and are difficult to unify. To solve this problem, a novel grid-forming control structure is proposed in this paper. The MMC emulates the synchronous generator (SG), and the submodule capacitor voltage emulates the SG rotor speed. On this basis, by utilizing the modulation control degree freedom, a unified DC-side controller is proposed to realize different control targets. Finally, the simulation model of a 4-terminal MMC-MTDC transmission system with renewable power integration is established in the PSCAD/EMTDC. The effectiveness of the proposed strategy is verified by the simulation results. © 2024 IEEE.

关键词： grid-forming MMC-MTDC multi-targets control unified control structure

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A fuse-based DC circuit breaker with vacuum interrupter enhanced by an external transverse magnetic field

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High Voltage 2024年第3期9卷 710-720页

作者： Yu Xiao Yi Wu Yifei Wu Fei Yang Mingzhe Rong Zhuo Yang State Key Laboratory of Electrical Insulation and Power Equipment School of Electric EngineeringXi'an Jiaotong UniversityXi'anChina State Grid Shaanxi Electric Power Company Limited Xi'anChina

Due to the increasing power system capacity,the interruption of large fault currents has gradually become a major challenge in power *** the moment,such currents are interrupted mainly via circuit breakers based on the method of active current ***,these types of circuit breakers tend to be costly and *** possible alternative—a fuse-based circuit breaker with current commutation process enhanced by an external transverse magnetic field(ETMF)—is proposed by the *** main advantage lies in the fast current commutation achieved by an ETMF-enhanced three-stage increase of the vacuum arc *** study of the current commutation process is mainly represented by the authors,and the influencing factors of the current commutation—contact opening speed and ETMF current—are *** last,the proposed circuit breaker is verified by an experiment,whose results show that a short-circuit current of 42 kA can be interrupted within just 2 ms.

关键词： vacuum transverse interrupt

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Pathway Planning of Nuclear power Development Incorporating Assessment of Nuclear Event Risk

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Journal of Modern power Systems and Clean Energy 2024年第2期12卷 500-513页

作者： Xinxin Yang Yusheng Xue Bin Cai School of Electrical Engineering Southeast UniversityNanjingChinaand they are also with State Grid Electric Power Research Institute(NARI Group Corporation)NanjingChina State Key Laboratory of Smart Grid Protection and Operation Control NanjingChina State Grid Electric Power Research Institute(NARI Group Corporation) NanjingChina

The nuclear event risk(NER)is an important and disputed factor that should be reasonably considered when planning the pathway of nuclear power development(NPD)to assess the benefits and risks of developing nuclear power more *** paper aims to explore the impact of nuclear events on NPD pathway *** influence of nuclear events is quantified as a monetary risk component,and an optimization model that incorporates the NER in the objective function is *** optimize the pathway of NPD in the lowcarbon transition course of power supply structure evolution,a simulation model is built to deduce alternative NPD pathways and corresponding power supply evolution scenarios under the constraint of an exogenously assigned carbon emission pathway(CEP);moreover,a method is proposed to describe the CEP by superimposing the maximum carbon emission space and each carbon emission reduction(CER)component,and various CER components are clustered considering the emission reduction characteristics and resource endowments of different power generation technologies.A case study is conducted to explore the impact of NER and its risk valuation uncertainty on NPD pathway *** method presented in this paper allows the impact of nuclear events on NPD pathway planning to be quantified and improves the level of coordinated optimization of benefits and risks.

关键词： Low-carbon transition power supply structure evolution nuclear power development(NPD) quantitative analysis nuclear event risk evaluation

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A Study of Nanosecond Clock Synchronization Methods for Real-Time Transient Simulation 6

A Study of Nanosecond Clock Synchronization Methods for Real...

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6th International Conference on Communications, Information System and Computer Engineering, CISCE 2024

作者： Guo, Qi Lu, Yuanhong Zhang, Jingyue Zhang, Jie Guo, Haiping Hu, Binjiang Electric Power Research Institute China Southern Power Grid State Key Laboratory of HVDC China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System China Electric Power Research Institute China Southern Power Grid Csg Key Laboratory for Power System Simulation Guangdong China

ISBN: (纸本)9798350353174

Conventional nanosecond clock synchronization protocols are generally target-type or content-type, the synchronization rate is low, which leads to the increasing of the mean value difference of synchronization, so we propose to study the design of nanosecond clock synchronization method for real-time transient simulation. Combined with the actual clock synchronization requirements, we first calculate the link congestion coefficient, adopt a multilevel approach to strengthen the synchronization rate, set up a multilevel clock synchronization protocol, based on which we determine the clock source quality coefficients and construct a nanosecond clock synchronization model for real-time transient simulation, and use redundancy processing to achieve clock synchronization. The test results show that compared with the high-efficiency phase-color clock synchronization method and the cross-clock synchronization method, the mean synchronization difference of the designed transient simulation nanosecond clock synchronization method is controlled to be less than 0.5, which indicates that the designed clock synchronization method is more efficient, stable, and targeted, and the synchronization effect is significantly improved. © 2024 IEEE.

关键词： Mechanical clocks

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Lightweight Intrusion Detection Using Reservoir Computing

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Computers, Materials & Continua 2024年第1期78卷 1345-1361页

作者： Jiarui Deng Wuqiang Shen Yihua Feng Guosheng Lu Guiquan Shen Lei Cui Shanxiang Lyu Joint Laboratory on Cyberspace Security China Southern Power GridGuangzhou510080China College of Cyber Security Jinan UniversityGuangzhou510632China Guangdong Power Grid Company Limited Guangzhou510663China School of Computer Science and Technology Guangdong University of TechnologyGuangzhou510006China China Southern Power Grid Extra High Voltage Transmission CompanyGuangzhouChina

The blockchain-empowered Internet of Vehicles(IoV)enables various services and achieves data security and privacy,significantly advancing modern vehicle ***,the increased frequency of data transmission and complex network connections among nodes also make them more susceptible to adversarial *** a result,an efficient intrusion detection system(IDS)becomes crucial for securing the IoV *** IDSs based on convolutional neural networks(CNN)often suffer from high training time and storage *** this paper,we propose a lightweight IDS solution to protect IoV against both intra-vehicle and external *** approach achieves superior performance,as demonstrated by key metrics such as accuracy and ***,our method achieves accuracy rates ranging from 99.08% to 100% on the Car-Hacking dataset,with a remarkably short training time.

关键词： Echo state network intrusion detection system Internet of Vehicles reservoir computing

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Study on the influence of mechanism dispersion on transient recovery voltage distribution of modular DC vacuum circuit breakers

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High Voltage 2024年第2期9卷 346-355页

作者： Chongyang Huang Yongshuai Yin Shuxin Liu Hanwen Du Zengyu Shan Yundong Cao Shurui Yang Key Laboratory of Special Electric Machines and High Voltage Apparatus in the Ministry of Education Shenyang University of TechnologyShenyangChina Shenyang Power Supply Company of State Grid Liaoning Electric Power Co. LtdShenyangChina Chifeng Power Supply Company of State Grid Mongolia Electric Power Co. LtdChifengChina

A simulation analysis and an experiment are carried out to investigate how the gap difference between the breaks of a direct current vacuum circuit breakers with multi-breaks(MB-DC VCB)caused by the mechanism dispersion of the breaker influences the distribution of TRV among the *** interruption model of MB-DC VCB,combining the continuous transition model,is established to analyse the rising rate of transient recovery voltage and the dielectric strength recovery speed of the breaks for MB-DC VCB under different gap difference *** on the experimental platform of dual break DC vacuum circuit breaker breaking,the correctness of the simulation model is verified on a DC VCB with the double-breaks interruption experimental ***,a model is applied to the non-synchronous interruption simulation of a DC VCB with *** relationship between the TRVs of the breaks under different gap difference conditions is analysed using the comparative analysis method,obtaining the maximum gap difference at the moment of breaking *** results of this study show that large-gap breaks have a higher TRV than small-gap breaks(the fracture of the action delay module),with double fractures reaching 1.4 times and triple fractures reaching a maximum of 1.52 times;the ability of small-gap breaks to withstand TRV is weak,giving rise to re-breakdown or even interruption failure;as the number of fractures increases,the maximum gap difference also *** the synchronous interruption ability of the MB-DC VCB is conducive to improving the interruption performance and interruption success rate of this type of a circuit breaker.

关键词： TRV transient distribution

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Research on Overvoltage Monitoring Technology for Distributed New Energy Intelligent Stations

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Distributed Generation and Alternative Energy Journal 2024年第6期39卷 1209-1228页

作者： Huang, Zhidu Zhang, Longfei Huang, Wei Li, Shan Chen, Yajuan Power Grid Electric Power Research Institute of Guangxi Nanning530023 China Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Electric Power Research Institute of Guangxi Power Grid Co. Ltd Nanning530023 China Nanning Power Supply Bureau of Guangxi Power Grid Co. Ltd Nanning530023 China

Distributed renewable energy sources such as wind, solar, and small hydropower of the new distribution network are mainly connected to the grid through distribution lines, which are susceptible to lightning overvoltage. Therefore, this paper conducts a lightning risk assessment of the active distribution network system, including the photovoltaic (PV) side and the line-side. The study analyzes the effectiveness of two lightning protection measures: strengthening insulation and installing lightning arresters in the new distribution network. Strengthening insulation involves enhancing the first three towers and all line towers. However, the results show that both methods cannot effectively reduce the lightning failure rate on the PV-side and may even lead to adverse effects. Additionally, the analysis of in stalling lightning arresters reveals that installing them on the first-level towers of the distribution line can significantly reduce the impact of lightning on both the line and PV-sides. In particular, installing lightning arresters simultaneously on the first three towers closest to the PV-side can drastically reduce the overall lightning trip rate on the line-side. © 2025 River Publishers.

关键词： Risk assessment

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