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Research on corona discharge suppression of high-voltage direct-current transmission lines based on dielectric-film-covered conductor

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Plasma Science and Technology 2021年第2期23卷 64-75页

作者： Yuze JIANG Qiying LI Xuekai ZHANG Diwen JIANG Shiqiang LIU Bangfa PENG Jie LI state grid Shandong Electric power Research Institute Jinan 250003People's Republic of China state grid Shandong Electric power company Jinan 250001People's Republic of China state grid Jinan Jiyang power supply company Jiyang 251400People's Republic of China School of Electrical Engineering Dalian University of TechnologyDalian 116024People's Republic of China

Corona discharge suppression for high-voltage direct-current(HVDC)transmission lines at line terminals such as converter stations is a subject that requires *** this paper,a method based on a conductor covered with dielectric film is proposed and implemented through a bench-scale *** with the bare conductor,the corona discharge suppression effect of the dielectric-film-covered conductor under positive polarity is studied from the composite field strength and ion current density using a line-plate experimental *** influences of film thickness and film material on the corona discharge suppression effect are *** charge accumulation and dissipation characteristics of different film materials are also *** results show that the conductor covered with dielectric film has excellent ability to inhibit corona *** ground-level composite field strength of the conductor covered with dielectric film is lower than its nominal field strength,and its ion current density is at the nA m^(−2) *** corona threshold voltage can be promoted by increasing the film thickness,but the ability to inhibit corona discharge becomes *** larger the surface electric field strength,the more charge accumulated,but the faster the charge dissipation *** with polyvinyl chloride film,cross-linked polyethylene film has stronger charge accumulation ability and slower charge dissipation rate,which can better restrain the corona discharge of HVDC transmission lines.

关键词： high-voltage direct-current(HVDC)transmission lines corona discharge suppression dielectric-film-covered conductor composite field strength ion current density

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Single-phase-to-ground Fault Detection with Distributed Parameters Analysis in Non-direct Grounded Systems

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CSEE Journal of power and Energy Systems 2019年第1期5卷 139-147页

作者： Baowen Liu Hongzhong Ma Honghua Xu Ping Ju College of Energy and Electrical Engineering Hohai UniversityNanjing 211100China state grid Jiangsu Electric power company Nanjing power supply company Nanjing 210008China

The fast and accurate detection of the single-phaseto-ground fault is of great significance for the reliability and safety of the power *** this paper,novel algorithms for distribution network protection were proposed with distributed parameters analysis in non-direct grounded *** first,novel generating mechanisms of zero-sequence voltage and residual current were *** the compositions of residue parameters,including residual current and residual admittances,were decomposed in *** that,an improved algorithm for a fault resistance calculation of a single phase-to-earth fault was also proposed,and the algorithm is much more convenient as it only needs to measure the variation of the zero-sequence voltage and does not need the prerequisites of the faulty feeder ***,the fault feeder can also be selected by an improved calculation algorithm of zero-sequence admittance of the faulty feeder,which cannot be affected by the asymmetry of the *** analysis and the MATALB/Simulink simulation results demonstrate the effectiveness of the proposed algorithms.

关键词： Fault resistance calculation fault feeder selection non-direct grounded system residual parameters residual current zero-sequence voltage

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Adaptive Learning-Based Delay-Sensitive and Secure Edge-End Collaboration for Multi-Mode Low-Carbon power IoT

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China Communications 2022年第7期19卷 324-336页

作者： Haijun Liao Zehan Jia Ruiqiuyu Wang Zhenyu Zhou Fei Wang Dongsheng Han Guangyuan Xu Zhenti Wang Yan Qin Hebei Key Laboratory of power Internet of Things Technology North China Electric Power UniversityBaoding 071003HebeiChina state grid Anhui Electric power company Chuzhou power supply company Chuzhou 239000AnhuiChina

Multi-mode power internet of things(PIoT)combines various communication media to provide spatio-temporal coverage for low-carbon operation in smart ***-end collaboration is feasible to achieve the full utilization of heterogeneous resources and ***,edge-end collaboration-based multi-mode PIoT faces challenges of mutual contradiction in communication and security quality of service(QoS)guarantee,inadaptability of resource management,and multi-mode access *** propose an Adaptive learning based delAysensitive and seCure Edge-End Collaboration algorithm(ACE_(2))to optimize multi-mode channel selection and split device power into artificial noise(AN)transmission and data transmission for secure data ***_(2) can achieve multi-attribute QoS guarantee,adaptive resource management and security enhancement,and access conflict elimination with the combined power of deep actor-critic(DAC),“win or learn fast(WoLF)”mechanism,and edge-end *** demonstrate its superior performance in queuing delay,energy consumption,secrecy capacity,and adaptability to differentiated low-carbon services.

关键词： multi-mode low-carbon PIoT edge-end collaboration multi-attribute QoS guarantee security enhancement adaptive deep actor-critic

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Decision Support System for Adaptive Restoration Control of Distribution System

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Journal of Modern power Systems and Clean Energy 2022年第5期10卷 1256-1273页

作者： Lili Hao Yusheng Xue Ze Li Haohao Wang Qun Xu School of Electrical Engineering and Control Science Nanjing Tech UniversityNanjing 211816China state grid Electric power Research Institute(NARI Group Corporation) NanjingChina state Key Laboratory of Smart grid Protection and Operation Control NanjingChina state grid Qingdao power supply company QingdaoChina

Aiming at the high-dimensional uncertainties of restoration process, an optimization model for distribution system restoration control is proposed considering expected restoration benefits, expected restoration costs, and security risks of the overall restoration scheme. In the proposed model, the effect of security control on restoration process is actively analyzed considering the security control costs of preventive, emergency, and correction controls. A two-layer decision support framework for distribution system restoration decision support system(DRDSS) is also designed. The upper layer of the proposed framework generates the pre-adjustment schemes of operation mode for energized power grid by load transfer and selects the optimal pre-adjustment scheme and the corresponding partitioning scheme based on the partition adjustment results of each pre-adjustment scheme. In addition, it optimizes the spatial-temporal decision-making of the inter-partition connectivity. For each partition, the lower layer of the proposed framework pre-selects the units and loads to be restored according to the pre-evaluated restoration income, generates the table of alternative restoration scheme for coping with uncertain events through simulation and deduction, and evaluates the risk and benefit of each *** the uncertain events in the actual restoration process, the current restoration scheme can be adaptively switched to a sub-optimal scheme or re-optimized if necessary. Meanwhile, the proposed framework provides an information interaction interface for collaborative restoration with the related transmission system. A 123-node test system is built to evaluate the effectiveness and adaptability of the proposed model and framework.

关键词： Distribution system restoration pre-adjustment of operation mode load transfer dynamic partitioning risk and benefit security control

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Nonlinear adaptive control of generating set steam valve for power systems 36

Nonlinear adaptive control of generating set steam valve for...

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第36届中国控制会议

作者： Qingyu Su Wanzhen Quan Weiwei Quan School of Automation Engineering Northeast Electric power University state grid power supply company of Anqing

ISBN: (纸本)9781538629185

As strongly nonlinear, dynamic,multidimensional and large scale systems, power systems in operation are always influenced by the external and internal disturbances;and thus the serious threat to stable operation of systems exists. In this paper, based on the three order mathematical model of single machine infinite systems with valve control and under the conditions that systems have unknown damping coefficient, Storage functions of control system are constructed on the basis of improved adaptive backstepping and Lyapunov methods. A nonlinear adaptive robust controller and a parameter update law are *** derived controller can not only ensure that the system states are bounded and keep the nonlinearity of power systems and the real-time parameter estimation but also improved the speed of parameter identification.

关键词： power systems nonlinear improved adaptive backstepping Lyapunov parameter identification

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power Flow Calculation for VSC-based AC/DC Hybrid Systems Based on Fast and Flexible Holomorphic Embedding

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Journal of Modern power Systems and Clean Energy 2024年第5期12卷 1370-1382页

作者： Peichuan Tian Yexuan Jin Ning Xie Chengmin Wang Chunyi Huang Key Laboratory of Control of power Transmission and Conversion(Ministry of Education) Shanghai Jiao Tong UniversityShanghai 200240China the state grid Hangzhou power supply company Hangzhou310009China

The power flow(PF)calculation for AC/DC hybrid systems based on voltage source converter(VSC)plays a crucial role in the operational analysis of the new energy *** fast and flexible holomorphic embedding(FFHE)PF method,with its non-iterative format founded on complex analysis theory,exhibits superior numerical performance compared with traditional iterative *** paper aims to extend the FFHE method to the PF problem in the VSC-based AC/DC hybrid *** form the AC/DC FFHE PF method,an AC/DC FFHE model with its solution scheme and a sequential AC/DC PF calculation framework are *** AC/DC FFHE model is established with a more flexible form to incorporate multiple control strategies of VSC while preserving the constructive and deterministic properties of original FFHE to reliably obtain operable AC/DC solutions from various initializations.A solution scheme for the proposed model is provided with specific recursive solution processes and accelerated Padé*** achieve the overall convergence of AC/DC PF,the AC/DC FFHE model is integrated into the sequential calculation framework with well-designed data exchange and control mode switching *** proposed method demonstrates significant efficiency improvements,especially in handling scenarios involving control mode switching and multiple *** numerical tests,the superiority of the proposed method is confirmed through comparisons of accuracy and efficiency with existing methods,as well as the impact analyses of different initializations.

关键词： AC/DC power flow holomorphic embedding numerical performance voltage source converter(VSC)

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Control scheme of hexagonal modular multilevel direct converter for offshore wind power integration via fractional frequency transmission system

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Journal of Modern power Systems and Clean Energy 2018年第1期6卷 168-180页

作者： Yongqing MENG Bo LIU Huiyong LUO Shuonan SHANG Haitao ZHANG Xifan WANG School of Electrical Engineering Xi'an Jiaotong University state grid Sichuan Provincial Electric power Corporation Tianfu New Area power supply company Henan Electric power Research Institute

A fractional frequency transmission system(FFTS)is a promising solution to offshore wind power integration,for which the hexagonal modular multilevel converter(Hexverter)is an attractive choice for power *** Hexverter has recently been proposed to directly connect two three-phase systems of different frequencies and voltage amplitudes,with only six branches in the FFTS in that *** paper examines for the first time the control scheme of the Hexverter when applied to offshore wind power integration via a ***,the frequency-decoupled mathematical model of the Hexverter is deduced by introducing the double dq *** the branch energy of the Hexverter is analyzed in detail and the reactive power constraint equation is *** corresponding control scheme is thoroughly discussed,including the inner loop current control,the outer loop voltage control in both grid-connected mode and passive mode,and a novel optimization method to minimize the circulating current in the ***,a simulation model of offshore wind power integration via a 4-terminal FFTS based on the Hexverter is built in MATALB/Simulink to verify the feasibility of Hexverter and the effectiveness of the control scheme proposed in this paper.

关键词： Hexagonal modular multilevel converter(Hexverter) Offshore wind power integration Fractional frequency transmission system(FFTS) Control scheme Circulating current optimization

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Flexible Load Participation in Peaking Shaving and Valley Filling Based on Dynamic Price Incentives

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Energy Engineering 2024年第2期121卷 523-540页

作者： Lifeng Wang Jing Yu Wenlu Ji Nanjing power supply company Nanjing210019China state grid Jiangsu Electric power Co. Ltd.Nanjing211103China

Considering the widening of the peak-valley difference in the power grid and the difficulty of the existing fixed time-of-use electricity price mechanism in meeting the energy demand of heterogeneous users at various moments or motivating users,the design of a reasonable dynamic pricing mechanism to actively engage users in demand response becomes imperative for power grid *** this purpose,a power grid-flexible load bilevel model is constructed based on dynamic pricing,where the leader is the dispatching center and the lower-level flexible load acts as the ***,an upper-level day-ahead dispatching model for the power grid is established,considering the lowest power grid dispatching cost as the objective function and incorporating the power grid-side ***,the lower level comprehensively considers the load characteristics of industrial load,energy storage,and data centers,and then establishes a lower-level flexible load operation model with the lowest user power-consuming cost as the objective ***,the proposed method is validated using the IEEE-118 system,and the findings indicate that the dynamic pricing mechanism for peaking shaving and valley filling can effectively guide users to respond actively,thereby reducing the peak-valley difference and decreasing users’purchasing costs.

关键词： Demand response fixed time-of-use electricity price mechanism dynamic price incentives mechanism bi-level model flexible load

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Research of an Integrated High-Voltage Energy Metering Device 36

Research of an Integrated High-Voltage Energy Metering Devic...

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第36届中国控制会议

作者： Aixiang Zhang Shizhan Song Chuanyong Wang Jian Zhang Kun Wang Liwei Li Zaozhuang power supply company State Grid Shandong Electric Power Company College of Automation and Electrical Engineering Qingdao University

ISBN: (纸本)9781538629185

The traditional metering device has some problems in system reliability,electricity-stealing prevention and *** order to solve the above problems,a new type of integrated high-voltage energy metering device is designed in this *** equal potential of the measuring integrated circuit is suspended on the high-voltage *** AD7753 is used as the core of the electric energy measurement unit to reduce the measurement *** device uses STM32 as the master of *** has many advantages such as low power consumption,saving resources,easy to install,and highly ***,the experimental results show that the performance of the device has reached 0.2 S accuracy requirements.

关键词： system reliability integration high-voltage energy metering device

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Adaptive Reclosing Scheme Based on Traveling Wave Injection For Multi-Terminal dc grids

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Energy Engineering 2023年第5期120卷 1271-1285页

作者： Peng Han Xinchen Zhao YannanWu Zhiyu Zhou Qi Qi state grid Beijing Electric power company Beijing100031China state grid Beijing Tongzhou Electric power supply company Beijing101101China state Key Laboratory of Alternate Electrical power Systemwith Renewable Energy Sources North China Electric Power UniversityBeijing102206China

The hybrid dc circuit breaker(HCB)has the advantages of fast action speed and low operating loss,which is an idealmethod for fault isolation ofmulti-terminal dc ***-terminal dc grids that transmit power through overhead lines,HCBs are required to have reclosing capability due to the high fault probability and the fact that most of the faults are temporary *** avoid the secondary fault strike and equipment damage that may be caused by the reclosing of the HCB when the permanent fault occurs,an adaptive reclosing scheme based on traveling wave injection is proposed in this *** scheme injects traveling wave signal into the fault dc line through the additionally configured auxiliary discharge branch in the HCB,and then uses the reflection characteristic of the traveling wave signal on the dc line to identify temporary and permanent faults,to be able to realize fast reclosing when the temporary fault occurs and reliably avoid reclosing after the permanent fault *** test results in the simulation model of the four-terminal dc grid show that the proposed adaptive reclosing scheme can quickly and reliably identify temporary and permanent faults,greatly shorten the power outage time of temporary *** addition,it has the advantages of easiness to implement,high reliability,robustness to high-resistance fault and no dead zone,etc.

关键词： Multi-terminal dc grid hybrid dc circuit breaker adaptive reclosing fault type identification traveling wave reflection characteristic

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