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Identification Methods for Transformer Turn-to-Turn Faults and Inrush Current Based on Electrical Information

Journal of Physics: Conference Series 2022年第1期2215卷

作者： Xinyi Gong Yuping Zheng Shuyan Pan Chonghao Wu Jinzhao Deng NARI Research Institute NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China State Key Laboratory of Smart Grid Protection and Control

Power transformer is the most imperative and crucial equipment in electrical power system. Accurately monitoring the occurrence of transformer faults and rapidly isolating the faults are of great significance to ensure the reliability of power supply and avoid serious damage to the transformer. There are many methods used in the transformer to monitor transformer running state. This paper provides a comprehensive overview of transformer turn-to-turn fault and inrush current identification methods based on electrical information, and expounds the systematic research content that needs to be carried out for transformer turn-to-turn fault identification methods based on magnetic flux leakage information.

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DC fault ride-through for wind power integration via MMC-HVDC based on precise control of energy storage configured inside wind farm

DC fault ride-through for wind power integration via MMC-HVD...

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Renewable Power Generation and Future Power Systems Conference 2023 (RPG 2023 UK)

作者： Y. Sun Y. Guo F. Fan J. Fan G. Li Z. Wang X. Wu Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin People's Republic of China School of Electrical Engineering and Automation Harbin Institute of Technology Harbin People's Republic of China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK State Grid Smart Grid Research Institute Beijing People's Republic of China

The modular multilevel converter-based high voltage direct current (MMC-HVDC) overhead lines transmission scheme is the preferred option for wind power integration, though it is susceptible to DC faults. To ensure the connection of a wind farm (WF) to the grid during DC faults, this paper proposes a coordinated control strategy for DC fault ride-through (FRT) based on the energy storage system configured inside the WF for wind power integration through a bipolar MMC-HVDC. In the case of an instantaneous DC fault, the non-fault pole is regulated to operate at full power state to maximise wind power transmission. The exceedance of available wind power outputs over the transmission capacity of the non-fault pole is then accurately allocated to the internal energy storage units (ESUs) of wind generators (WGs) in order to ensure the power balance of the system and reduce the state of charge variance of ESUs as soon as possible. In order to reduce the energy capacities of ESUs required to store the excessive wind power in the event of a permanent DC fault, the method of step-by-step removing WGs is adopted to ensure the system power remaining balanced when the internal ESUs of the disconnected WGs are out of operation. The model is developed and carried out on the PSCAD/EMTDC simulation platform to verify the effectiveness of the proposed control strategies.

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Questionnaire Survey System for Residential Customers based on Developed Consumption Behavior Model

Questionnaire Survey System for Residential Customers based ...

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Chinese Automation Congress (CAC)

作者： Jianmin Zhang Dongming Liu Yusheng Xue Huanlei Yu Zhenyuan Xiao Ping Luo School of Automation Hangzhou Dianzi University Hangzhou China State Key Laboratory on Smart Grid Protection and Control Nanjing China

ISBN: (数字)9781728176871

ISBN: (纸本)9781728176888

The big obstacles for residential energy transition are from lacks of consumption behavior model and relative information system. A four-tier residential energy demand model is developed to explore the cognition-consciousness-demand-behavior evolution process; then residential energy behavior analysis data sources are investigated and necessity of questionnaire survey system is analyzed. To have a theory-supported information system, extension of Engel-Kollat-Blackwell consumption behavior model has been developed, and design of questionnaire survey system for residential customer is introduced with simple analysis of real implementation.

关键词： Green products Information systems Home appliances Energy consumption Biological system modeling Automation Cognition

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ANovel SCUC Model Considering Area control Errors and Resulting Penalties

ANovel SCUC Model Considering Area Control Errors and Result...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Yuancheng Miao Bingbing Song Lifeng Wang Xiaobi Teng Yutong Li Zijie Chen Sijie Chen East China Branch of State Grid Corporation of China Shanghai China College of Smart Energy Shanghai Jiao Tong University Shanghai China Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China Shanghai Non-Carbon Energy Conversion and Utilization Institute Shanghai Jiao Tong University Shanghai China

The traditional Security Constrained Unit Com-mitment (SCUC) model focuses on minimizing the total cost of electricity generation while ensuring system security and reliability. However, this model does not consider the possibility that Independent System Operators (ISOs) can intentionally allow for area control errors (ACE) to reduce energy purchase costs. This article incorporates ACE and its associated penalties into the SCUC model. Given specific penalty prices, the model can reflect the impact of considering ACE on an ISOs' power pur-chasing decisions. Experimental results show that when penalty prices are relatively low, ISOs are more profitable by generating ACE and paying penalties than by purchasing electricity from other ISOs or purchasing demand response from flexible loads. Therefore a high-enough penalty price is necessary to ensure system reliability.

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Research on Service-Oriented Substation Wide-Area Operation and Maintenance System and Its Application

Research on Service-Oriented Substation Wide-Area Operation ...

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Sustainable Power and Energy Conference (iSPEC)

作者： Feng Liang Xudong Liang Shanglin Yang Hongxiang Pan NARI Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China NARI Group Corporation Nanjing China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

The substation has the features of a large quantity and wide-area distribution. With the promotion of unattended mode, it has become increasingly difficult to adapt to the needs of smart grid development using traditional field-based automatic equipment operation and maintenance(O&M) method. Meanwhile, there is a shortage of professional and technical personnel, and the O&M technology of a large number of intelligent heterogeneous secondary equipment is complicated and challenging to maintain. Therefore, it is urgent to solve the problems of O&M efficiency, timeliness and technical complexity of a large number of substations. Based on the service-oriented idea, this article has designed the overall structure of the trinity of service management center, O&M center and O&M substation. This paper also proposes a GSP-based service standardization interaction mechanism. Through Safety management and control process of O&M service, O&M advanced applications are designed to achieves the automation equipment specification, safe and reliable remote operation and maintenance.

关键词： Substation automation Safety management Production Standardization Reliability engineering smart grids Security

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Review of cyber physical system and cyber attack modeling

Review of cyber physical system and cyber attack modeling

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IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

作者： Haofei Fan Ming Ni Lili Zhao Manli Li NARI Group Corporation NARI Technology Co. Ltd State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (数字)9781728157481

ISBN: (纸本)9781728157498

Cyber Physics Systems consists of physical systems and information systems. Modern power systems are increasingly dependent on information systems, experts and scholars are paying more and more attention to cyber attacks on CPS. This paper first introduces the existing research on cyber physical power system. Then this paper reviews the current status of existing cyber attacks. Finally, the modeling method for CPS is summarized such as correlation characteristic matrix, graph theory, complex network theory, finite state machine, mathematical programming and cellular automata method. These methods have vital theoretical and practical significance for the research of cyber physical power system.

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Self-healing anti-corrosion coatings: A mechanism study using computational materials science

Electrical Materials and Applications

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Electrical Materials and Applications 2024年第1期1卷

作者： Luyao Huang Weiting Chen Wenkui Hao Jinke Wang Xin Guo Lingwei Ma Dawei Zhang State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China National Materials Corrosion and Protection Data Center University of Science and Technology Beijing Beijing China

Self-healing coatings possess the remarkable ability to autonomously mend damages and restore their corrosion protection capabilities, which are compromised due to environmental influences or external forces. The progression of computational materials science has significantly bolstered theoretical explorations into self-healing anti-corrosion coatings. Such inquiries enhance our grasp of self-healing mechanisms, refine coating efficacy, and curtail the expenditures associated with empirical approaches. The research advancements in computational materials science for self-healing coatings are reviewed here. It delineates the theoretical elucidation of self-healing mechanisms through the lens of molecular dynamics, density functional theory, Monte Carlo simulations, and finite element analysis. The computational exploration of intrinsic self-healing coatings primarily involves dynamic reversible covalent bonds, dynamic reversible non-covalent bonds, and shape memory effect; whereas, extrinsic self-healing coatings concentrate on the modalities of film-forming substances and the adsorption behaviours of corrosion inhibitors. These simulation techniques not only shed light on the self-healing processes at a microscopic scale but also enable the prediction and enhancement of the macroscopic performance attributes of the coatings in practical applications. The merits and constraints of these computational simulation methodologies when applied to self-healing coatings are critically assessed. Looking ahead, efforts will be directed towards a more profound amalgamation of computational simulations, empirical investigations, and artificial intelligence. This will pave the way for creating a comprehensive database cataloguing the self-healing properties of coatings, thereby streamlining material selection and design with greater efficiency.

关键词： anti-corrosion coating computational materials science corrosion inhibitor density function theory finite element analysis microcapsules molecular dynamics self-healing

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Study on the fault ride through control for AC-DC hybrid distribution network 16

Study on the fault ride through control for AC-DC hybrid dis...

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16th IET International Conference on AC and DC Power Transmission, ACDC 2020

作者： Zhou, Yongrong Lu, Yongcan Ge, Xuefeng Li, Dandong State Grid Electric Power Research Institute Co. Ltd. Jiangsu Province Nanjing China State Key Laboratory of Smart Grid Protection and Operational Control Jiangsu Province Nanjing China School of Power Electric Engineering Nanjing Institute of Technology Jiangsu Province Nanjing China Electric Power Research Institute State Grid Jiangsu Electric Power Co. Ltd Jiangsu Province Nanjing China

ISBN: (纸本)9781839533914

Fault ride through control is an important technology for an efficient operation of AC/DC hybrid distribution network with multiple distributed energies. In this paper, a fault ride through control with energy storage is proposed, in which extra super capacitors is installed on the dc side of the power electronic transformer. The coordinated control of the super capacitors is designed. Meanwhile, the volume calculation of super capacitor is discussed. Finally, a model is established in MATLAB/Simulink and simulations are carried out. The results verify that the low voltage ride through ability of AC/DC hybrid distribution network is enhanced, and the output voltage of the DC side is more stable, with the auxiliary super capacitor. © 2020 Institution of Engineering and Technology. All rights reserved.

关键词： Energy storage

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On the Ft-Icr Mass Spectrometry Analysis of Dissolved Organic Matter Released by Adsorbent During Coal Chemical Wastewater Treatment

SSRN

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SSRN 2024年

作者： Wei, Qi Chen, Cai Ma, Hong-Peng Liu, Tao Liu, Bing Wang, Tian-Xiang Zhang, Sen Yang, Dan-Hui Lv, Wen-Jie Wang, Hua-Lin National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery East China University of Science and Technology Shanghai200237 China State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and Technology Shanghai200237 China Key Laboratory of Special Functional and Smart Polymer Materials Ministry of Industry and Information Technology Northwestern Polytechnical University Shaan Xi 710072 China Methanol to Olefins Center Shaanxi Yanchang Petroleum Yan'an Energy Chemical Co. Ltd. Shaan Xi 727500 China

This study analyzed the dissolved organic matter (DOM) released by adsorbent during wastewater treatment. It was found that the adsorption method resulted in an organic removal efficiency of over 97% for coal-to-olefin (CTO) wastewater, with the lowest value of 15.7 mg/L. The Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR MS) detected 4111 DOM in the wastewater, 4052 remaining DOM after first-stage anthracite (ANC) adsorption, and 1013 after second-stage macroporous adsorption resin (MAR). The removal degree of lipids in wastewater was the highest, followed by proteins and lignin. During the adsorption process, the proportion of halogenated compounds (HCs) declined from 59.86% to 38.63% and 21.67%. Additionally, freshly produced 2035 and 311 DOMs were found in the adsorption effluent of ANC and MAR, respectively, with HCs accounting for 34.71% and 67.96%. Upon flowing ultra-pure water through ANC and MAR, the effluent dissolved organic carbon (DOC) ranges were 1.118-3.574 mg/L and 1.014-2.557 mg/L, respectively. There were 159 and 131 kinds of DOM detected, respectively, with HCs content of 59.06% and 45.02%. Comparative experiments revealed the complex components of the wastewater promoting the release of organic matter on the adsorbent surface that further reacted to generate organic matter. However, fewer substances were released by the adsorbent. © 2024, The Authors. All rights reserved.

关键词： Adsorption

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Impact of Generation Companies’ Heterogeneous Investment Behaviors on the Effects of Non-fossil Energy Incentive Policies

Impact of Generation Companies’ Heterogeneous Investment Be...

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Sustainable Power and Energy Conference (iSPEC)

作者： Bin Cai Tianran Li Kui Wang Zhiyuan Li Lei Zhu Jun Wen Yusheng Xue State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation/State Grid Electric Power Research Institute Nanjing China NARI School of Electrical and Automation Engineering Engineering Laboratory of Gas-Electricity Integrated Energy of Jiangsu Province Nanjing Normal University Nanjing China China Huaneng Group Co. Ltd Beijing China

ISBN: (纸本)9781665414401

The incentive policies for non-fossil energy are important factors affecting the investment behavior of generation companies (GENCOs). However, the investment behavior of different types of GENCOs in the system could be quite different, so the implementation of the policy must consider how to achieve incentive compatibility with the investment behavior of GENCOs. This article constructs a power transition simulation model that considers the investment behavior of GENCOs. Taking the wind power feed-in tariff policy as an example, it analyzes the impact of policy on the whole system’s low carbon transition pathway of the power structure and the evolution trajectory of system carbon emissions under different behavior scenarios.

关键词： Economics Analytical models Conferences Tariffs Carbon dioxide Companies Wind power generation

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