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Synergetic optimization operation method for distribution network based on SOP and PV

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Global Energy Interconnection 2024年第2期7卷 130-141页

作者： Lei Chen Ning Zhang Xingfang Yang Wei Pei Zhenxing Zhao Yinan Zhu Hao Xiao state grid Shijiazhuang Electric power company Shijiazhuang 130100P.R.China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190P.R.China IEEE power and Energy Society New YorkUSA

The integration of distributed generation brings in new challenges for the operation of distribution networks,including out-of-limit voltage and power flow *** open points(SOP)are new power electronic devices that can flexibly control active and reactive power *** the exception of active power output,photovoltaic(PV)devices can provide reactive power compensation through an ***,a synergetic optimization operation method for SOP and PV in a distribution network is proposed.A synergetic optimization model was *** voltage deviation,network loss,and ratio of photovoltaic abandonment were selected as the objective *** PV model was improved by considering the three reactive power output modes of the PV *** the load fluctuation and loss of the SOP were *** multi-objective optimization algorithms were used,and a compromise optimal solution was *** studies were conducted using an IEEE 33-node *** simulation results indicated that the SOP and PVs complemented each other in terms of active power transmission and reactive power *** optimization improves power control capability and flexibility,providing better power quality and PV consumption rate.

关键词： Synergetic optimization Soft open point(SOP) Photovoltaic(PV) Distribution network

Multi-area Frequency-constrained Unit Commitment for power Systems with High Penetration of Renewable Energy Sources and Induction Machine Load

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Journal of Modern power Systems and Clean Energy 2024年第3期12卷 754-766页

作者： Leibao Wang Hui Fan Jifeng Liang Longxun Xu Tiecheng Li Peng Luo Bo Hu Kaigui Xie the state grid Hebei Electric power Research Institute Shijiazhuang 050021China state Key Laboratory of power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400044China

The increasing penetration of renewable energy sources(RESs)brings great challenges to the frequency security of power *** traditional frequency-constrained unit commitment(FCUC)analyzes frequency by simplifying the average system frequency and ignoring numerous induction machines(IMs)in load,which may underestimate the risk and increase the operational *** this paper,we consider a multiarea frequency response(MAFR)model to capture the frequency dynamics in the unit scheduling problem,in which regional frequency security and the inertia of IM load are modeled with high-dimension differential algebraic equations.A multi-area FCUC(MFCUC)is formulated as mixed-integer nonlinear programming(MINLP)on the basis of the MAFR ***,we develop a multi-direction decomposition algorithm to solve the MFCUC *** original MINLP is decomposed into a master problem and *** subproblems check the nonlinear frequency dynamics and generate linear optimization cuts for the master problem to improve the frequency security in its optimal *** studies on the modified IEEE 39-bus system and IEEE 118-bus system show a great reduction in operational ***,simulation results verify the ability of the proposed MAFR model to reflect regional frequency security and the available inertia of IMs in unit scheduling.

关键词： Decomposition algorithm frequency response frequency-constrained unit commitment induction machine multi-area mixed-integer nonlinear programming(MINLP)

A CNN-Based Single-Stage Occlusion Real-Time Target Detection Method

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Journal of Intelligent Learning Systems and Applications 2024年第1期16卷 1-11页

作者： Liang Liu Nan Yang Saifei Liu Yuanyuan Cao Shuowen Tian Tiancheng Liu Xun Zhao Rizhao power supply company State Grid Shandong Electric Power Company Rizhao China School of Automation Beijing Information Science and Technology University Beijing China

Aiming at the problem of low accuracy of traditional target detection methods for target detection in endoscopes in substation environments, a CNN-based real-time detection method for masked targets is proposed. The method adopts the overall design of backbone network, detection network and algorithmic parameter optimisation method, completes the model training on the self-constructed occlusion target dataset, and adopts the multi-scale perception method for target detection. The HNM algorithm is used to screen positive and negative samples during the training process, and the NMS algorithm is used to post-process the prediction results during the detection process to improve the detection efficiency. After experimental validation, the obtained model has the multi-class average predicted value (mAP) of the dataset. It has general advantages over traditional target detection methods. The detection time of a single target on FDDB dataset is 39 ms, which can meet the need of real-time target detection. In addition, the project team has successfully deployed the method into substations and put it into use in many places in Beijing, which is important for achieving the anomaly of occlusion target detection.

关键词： Real-Time Mask Target CNN (Convolutional Neural Network) Single-Stage Detection Multi-Scale Feature Perception

Analysis of multiple-faults of high-voltage circuit breakers based on non-negative matrix decomposition

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Global Energy Interconnection 2024年第2期7卷 179-189页

作者： Yongrong Zhou Zhaoxing Ma Hao Chen Ruihua Wang state Key Laboratory of Technology and Equipment for Defense against power System Operational Risks Nanjing 211106P.R.China Nari Group Co. Ltd.Nanjing 211106P.R.China Qingdao University of Technology School of Information and Control EngineeringQingdao 266520P.R.China state grid Nanjing power supply company Nanjing 211000P.R.China

High-voltage circuit breakers are the core equipment in power networks,and to a certain extent,are related to the safe and reliable operation of power ***,their core components are prone to mechanical *** study proposes a component separation method to detect multiple mechanical faults in circuit breakers that can achieve online real-time ***,a model and strategy are presented for obtaining mechanical voiceprint signals from circuit ***,the component separation method was used to decompose the voiceprint signals of multiple faults into individual component *** on this,the recognition of the features of a single-fault voiceprint signal can be ***,multiple faults in high-voltage circuit breakers were identified through an experimental simulation and verification of the circuit breaker voiceprint signals collected from the substation *** research results indicate that the proposed method exhibits excellent performance for multiple mechanical faults,such as spring structures and loose internal components of circuit *** addition,it provides a reference method for the real-time online monitoring of high-voltage circuit breakers.

关键词： High voltage circuit breaker Signal separation Monitor Multiple faults power system

Enhancing hyperspectral power transmission line defect and hazard identification with an improved YOLO-based model

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Optoelectronics Letters 2024年第11期 681-688页

作者： WANG Meng SUN Long JIANG Jiong YANG Jinsong ZHANG Xingru Ningbo power Transmission and Transformation Construction Co. Ltd.Yongyao Technology Branch state grid Ningbo power supply company

To address the challenges of inefficient manual inspections and time-consuming video monitoring for power transmission lines, this paper presents an innovative solution. It combines deep learning algorithms with visib...

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Enhancing Autonomy Capability in Regional power grids:A Strategic Planning Approach withMultiple Autonomous Evaluation Indexes

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Energy Engineering 2024年第9期121卷 2449-2477页

作者： Jie Ma Tong Zhao Yuanzhao Hao Wenwen Qin Haozheng Yu Mingxuan Du Yuanhong Liu Liang Zhang Shixia Mu Cuiping Li Junhui Li Planning and Assessment Center Department State Grid Henan Economic Research InstituteZhengzhou450000China Key Laboratory of Modern power System Simulation and Control&Renewable Energy Technology Ministry of EducationNortheast Electric Power UniversityJilin132012China Development Planning Department State Grid Henan Electric Power CompanyZhengzhou450000China Innovation Development Research Center State Grid Shanghai Energy Internet Research Institute Co.Ltd.Shanghai201210China state grid Simulation Center China Electric Power Research Institute Co.Ltd.Beijing100192China

After the integration of large-scale DistributedGeneration(DG)into the distribution network,the randomness and volatility of its output result in a reduction of spatiotemporal alignment between power generation and demand in the distribution network,exacerbating the phenomenon of wind and solar power *** a novel power system model,the fundamental concept of Regional Autonomous power grids(RAPGs)is to achieve localized management and energy autonomy,thereby facilitating the effective consumption of ***,this paper proposes a distributed resource planning strategy that enhances the autonomy capabilities of regional power grids by considering multiple evaluation indexes for ***,a regional Energy Storage(ES)configuration strategy is *** strategy can select a suitable reference value for the upper limit of ES configuration based on the regional load andDGoutput to maximize the elimination of source load deviations in the region as the upper limit constraint of ES ***,a control strategy for regional ES is proposed,the charging and discharging reference line of ES is set,and multiple autonomy and economic indexes are used as objective functions to select different proportions of ES to control the distributed resources of the regional power grid and establish evaluation indexes of the internal regional generation and load power ratio,the proportion of power supply matching hours,new energy consumption rate and tie line power imbalance outside the region to evaluate changes in the regional autonomy *** final simulation results showthat in the real regional grid example,the planning method in the planning year in the region of the overall power supply matching hour ratio and new energy consumption rate increased by 3.9%and 4.8%on average,and the power imbalance of the tie line decreased by 7.8%on *** proposed planning approach enables the maximization of regional autonomy while effectively smoothing the fluct

关键词： Regional autonomous power grid distributed generation distributed energy storage regional planning strategy evaluation index

Double-ring high-frequency common-mode switching oscillation current sensor for inverter-fed machine winding insulation monitoring

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Global Energy Interconnection 2024年第1期7卷 106-116页

作者： Lingqing Pan Xizhou Du Xing Lei Ting Ye Dawei Xiang Hao Li College of Electrical power Engineering Shanghai University of Electric PowerShanghai 200090P.R.China state grid Shanghai Municipal Electric power company Shanghai 200122P.R.China College of Electronics and Information Engineering Tongji UniversityShanghai 201804P.R.China

Insulation failure significantly contributes to the unpredictable shutdown of power *** to the partial discharge and high-frequency(HF)injection methods,the HF common-mode(CM)leakage current method offers a non-intrusive and highly sensitive ***,the detection of HF CM currents is susceptible to interference from differential-mode(DM)currents,which exhibit high-amplitude and multifrequency components during normal *** address this challenge,this paper proposes a double-ring current sensor based on the principle of magnetic shielding for inverter-fed machine winding insulation *** inner ring harnesses the magnetic aggregation effect to isolate the DM current magnetic field,whereas the outer ring serves as the magnetic core of the Rogowski current sensor,enabling HF CM current ***,the magnetic field distributions of the CM and DM currents were ***,a correlation between the sensor parameters and signal-to-noise ratio of the target HF CM current was ***,an experimental study was conducted on a 3-kW PMSM for *** results indicate that the proposed double-ring HF CM sensor can effectively mitigate DM current *** to a single-ring sensor,a reduction of approximately 40%in the DM component was achieved,which significantly enhanced the precision of online insulation monitoring.

关键词： Magnetic shielding Double-ring Common-mode current Maxwell simulation

Plasma nitrogen fixation system with dual-loop enhancement for improved energy efficiency and its efficacy for lettuce cultivation

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Plasma Science and Technology 2024年第1期26卷 82-92页

作者：韩泽阳张梦雪张頔何欣井天军葛知轩李玉鸽朱童任云鸿仲崇山季方 College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083People’s Republic of China College of Water Resources and Civil Engineering China Agricultural UniversityBeijing 100083People’s Republic of China Electric power Research Institute state grid Gansu Electric Power Company GansuLanzhou 730030People’s Republic of China

Plasma nitrogen fixation(PNF)has been emerging as a promising technology for greenhouse gasfree and renewable energy-based ***,most PNF studies seldom address practical application-specific *** this work,we present the development of a compact and automatic PNF system for on-site agricultural *** system utilized a gliding-arc discharge as the plasma source and employed a dual-loop design to generate NO_(x)from air and water under atmospheric *** results showed that the system with a dualloop design performs well in terms of energy costs and production *** operational parameters for the system were determined through experimentation,resulting in an energy cost of 13.9 MJ mol^(-1)and an energy efficiency of 16 g kWh^(-1)for NO_(3)^(-)production,***,the concentration of exhausted NO_(x)was below the emission *** lettuce cultivation experiments demonstrated that NO_(x)^(-)produced by the PNF system could serve as liquid nitrate nitrogen ***,our work demonstrates the potential of the developed PNF system for on-site application in the production of green-leaf vegetables.

关键词： plasma nitrogen fixation gliding arc soilless cultivation lettuce

Optimal decision-making method for equipment maintenance to enhance the resilience of power digital twin system under extreme disaster

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Global Energy Interconnection 2024年第3期7卷 336-346页

作者： Song Gao Wei Wang Jingyi Chen Xinyu Wu Junyan Shao Electric power Scientific Research Institute State Grid Jilin Electric Power CoLtdChangchun132000P.R.China Department of Electrical Engineering Northeast Electric Power UniversityJilin132012P.R.China

Digital twins and the physical assets of electric power systems face the potential risk of data loss and monitoring failures owing to catastrophic events,causing surveillance and energy *** study aims to refine maintenance strategies for the monitoring of an electric power digital twin system post ***,the research delineates the physical electric power system along with its digital counterpart and post-disaster restoration ***,it delves into communication and data processing mechanisms,specifically focusing on central data processing(CDP),communication routers(CRs),and phasor measurement units(PMUs),to re-establish an equipment recovery model based on these data transmission ***,it introduces a mathematical optimization model designed to enhance the digital twin system’s post-disaster monitoring efficacy by employing the branch-and-bound method for its *** efficacy of the proposed model was corroborated by analyzing an IEEE-14 *** findings suggest that the proposed branch-and-bound algorithm significantly augments the observational capabilities of a power system with limited resources,thereby bolstering its stability and emergency response mechanisms.

关键词： Phasor measurement units Through-sequence optimization Resilience enhancement Communication networks Digital twins