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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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Identification of key Transmission Lines Based on Super Efficiency Data Envelopment Analysis Model

Identification of Key Transmission Lines Based on Super Effi...

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IEEE Asia Power and Energy Engineering Conference (APEEC)

作者： Lingxu Guo Yuan Zeng Cheng Yao Xin Wang Wenxu Zhang Waiying Guo Power Dispatching and Control Center State Grid Tianjin Electric Power Company Tianjin China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China Tianjin Key Laboratory of Internet of Things in Electricity Tianjin Research Institute of Electric Science Tianjin China

Transmission lines are an important part of the power system. The selection of key transmission lines is conducive to the stable and safe operation of the transmission system. With the application of new technologies such as regional grid interconnection, wind power grid integration, and demand response, the internal structure and operating status of the power system are becoming more and more complicated. In view of this, this paper focuses on the comprehensive analysis and evaluation of key transmission line equipment, and proposes a comprehensive index calculation method based on the super-efficiency data envelopment analysis model to improve the key transmission line in the calculation of evaluation indicators. This paper also takes wind power and interruptible loads into consideration, uses situational awareness theory to divide the identification of key transmission lines into three phases: awareness phase, understanding phase, and prediction and presentation phase to evaluate and screen key transmission lines. Finally, taking the IEEE 24-node system as an example, the correctness and effectiveness of the method proposed in this paper are verified. The research work can provide useful references for system operators.

关键词： Analytical models Power transmission lines Wind power generation Data models Safety Indexes Security

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Fault diagnosis method for ship power-system DC–DC converter using augmented WPD and multi-branch CNN-BiLSTM network

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Journal of the Franklin Institute 2025年第9期362卷

作者： Ren, Yuanjie Zhang, Lanyong Shi, Peng Peng, Huimin College of Intelligent Systems Science and Engineering Harbin Engineering University Harbin150001 China School of Electrical and Mechanical Engineering The University of Adelaide SA5000 Australia State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Jiangsu Nanjing211106 China

Direct current (DC) –DC converters are indispensable energy conversion devices in medium-voltage DC power systems of ships. Herein, the fault diagnosis problem of bidirectional DC–DC converters is investigated. Considering that the fault diagnosis of bidirectional DC–DC converters requires the effective combination of information from multiple diagnostic signals and differences in characteristic data in different time scales, a parallel stacking of multiple branches based on enhanced wavelet packet decomposition technology is proposed as a hybrid model of a convolutional neural network and bidirectional long short-term memory network. First, a multi-input method is used to extract effective features in the sequence data. Second, a multi-model fusion processing framework is used to perform fault diagnosis analysis on the DC–DC converter. Finally, the squeeze and excitation attention mechanism is used to weight all types of fault features and adaptively obtain them. The important weights of the classification feature maps learned by different branches generate fault classification results. Experimental results reveal that the proposed method can extract highly discriminative features from raw data and exhibits robustness in noisy environments. © 2025 The Franklin Institute

关键词： Convolutional neural networks

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Reliability and Safety Assessment of Distribution Networks in Mountainous Plateau Areas Subject to Low-amplitude Lightning

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Reliability Engineering & System Safety 2025年

作者： Yutao Tang Kai He Hongchun Shu Ke Wang Weijie Lou Zhong Qin Yiming Han Yue Dai State Key Laboratory of Collaborative Innovation Center for Smart Grid Fault Detection Protection and Control Jointly (Kunming University of Science and Technology) Kunming 650500 China Faculty of Electric power Engineering Kunming University of Science and Technology Kunming 650500 China Electric Power Research Institute of Yunnan Power Grid Kunming 650217 China

Lightning poses a primary threat to the safety and reliability of power systems, especially distribution networks are susceptible to lightning-related accidents due to their weaker protective capabilities. In plateau and mountainous regions, distribution lines are particularly affected by Low-amplitude Lightning (LaL) due to the shielding and attracting effects of mountains and the earth. Analyzing and assessing the overvoltage risks posed by LaL to distribution lines holds significant practical value. This paper develops a risk assessment model for distribution lines in plateau and mountainous regions, firstly, driven by actual lightning data collected by the High Precision Lightning Location System (HPLLS), found that the LaL events exhibited a notably high occurrence frequency of 46.02%. Secondly, a fractal streamlines model (FSM) for simulating the development of lightning leaders is proposed. Finally, based on the FSM, the probability and spatial distribution of LaL direct strikes are calculated, within the lightning strike range, the probability of LaL directly hitting distribution lines was close to 100%, the overvoltage caused by LaL can reach hundreds of kV, and a risk-based LaL damage assessment model is presented. This integrated methodology advances lightning risk assessment practices, providing a physics-informed foundation for enhancing the reliability of mountainous distribution networks.

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A security scheme for intelligent substation communications considering real-time performance

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Journal of Modern Power Systems and Clean Energy 2019年第4期7卷 948-961页

作者： Jie ZHANG Jun’e LI Xiong CHEN Ming NI Ting WANG Jianbo LUO Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of EducationSchool of Cyber Science and EngineeringWuhan UniversityWuhan 430072China NARI Group Corporation(State Grid Electric Power Research Institute) Nanjing 211106China NARI Technology Co.Ltd. Nanjing 211106China State Key Laboratory of Smart Grid Protection and Control Nanjing 211106China

Tampering,forgery and theft of the measurement and control messages in a smart grid could cause one breakdown in the power ***,no security measures are employed for communications in intelligent *** services in an intelligent substation have high demands for real-time performance,which must be considered when deploying security *** paper studies the security requirements of communication services in intelligent substations,analyzes the security capabilities and shortages of IEC 62351,and proposes a novel security scheme for intelligent substation *** security scheme covers internal and telecontrol communications,in which the real-time performance of each security measure is *** this scheme,certificateless public key cryptography(CLPKC)is used to avoid the latency of certificate exchange in certificate-based cryptosystem and the problem of key escrow in identity-based cryptosystem;the security measures of generic object-oriented substation event,sampled measure value and manufacturing message specification in IEC 62351 are improved to meet the real-time requirements of the messages as well as to provide new security features to resist repudiation and replay attacks;and the security at transport layer is modified to fit CLPKC,which implements mutual authentication by exchanging ***,a deployment of CLPKC in an intelligent substation is *** also evaluate the security properties of the scheme and analyze the end-to-end delays of secured services by combining theoretical calculation and simulation in this *** results indicate that the proposed scheme meets the requirements of security and real-time performance of communications in intelligent substations.

关键词： Intelligent substation Security measures Certificateless public key cryptography(CLPKC) Real-time communication IEC 62351

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Leakage Flux-Based Method to Identify the Inrush Current in Transformers

Leakage Flux-Based Method to Identify the Inrush Current in ...

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International Conference on Measuring Technology and Mechatronics Automation, ICMTMA

作者： Zheng Yu-Ping Zhang Zhen-Ya Wu Chong-Hao Pan Shu-Yan Zhou Li State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation(State Grid Electric Power Research Institute)NARI Technology Co. Ltd. Nanjing China

ISBN: (数字)9781728170817

ISBN: (纸本)9781728170824

Inrush current occurrence in the power transformers is an unavoidable event that can happen due to energizing no-load transformer. Although various protection methods based on the terminal current and/or voltage have been proposed for transformer protection, the protection malfunction caused by the inrush current still occurs occasionally. In this paper, By comparing different closing angles of transformers with normal condition and differences in leakage flux near the yoke, a simple and accurate method is presented to identify transformer inrush current conditions. The change of the flux density on the leakage flux sensor can effectively identify the transformer inrush current. This identification method has been initially verified in the simulation in Maxwell.

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Influence of Marine Shewanella Putrefaciens and Mediated Calcium Deposition on Q235 Carbon Steel Corrosion

SSRN

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SSRN 2023年

作者： Lou, Yuntian Huang, Luyao Chang, Weiwei Chen, Xudong Hao, Xiangping Qian, Hongchang Zhang, Dawei Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China National Materials Corrosion and Protection Data Center University of Science and Technology Beijing Beijing100083 China Shunde Innovation School University of Science and Technology Beijing Foshan528399 China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing102209 China School of Materials Science and Hydrogen Energy Foshan University Foshan528000 China

Microbiologically influenced corrosion inhibition (MICI) of Q235 carbon steel by Shewanella putrefaciens and mediated calcium deposition was investigated via regulation of microbial mineralization. In calcium-rich medium, S. putrefaciens rapidly created a protective calcium carbonate layer on the steel surface, blocking Cl-diffusion. Without calcium, the biofilm and rust layer mitigated pitting corrosion but couldn't prevent Cl-penetration. The potentiodynamic polarization results indicated that the corrosion current density (icorr value) in the S. putrefaciens-inoculated media with and without calcium were 0.38 μA/cm2 and 0.61 μA/cm2, respectively. The corrosion inhibition rates compared to the sterile condition were 92.18% and 87.44%. Electrochemical Impedance Spectroscopy (EIS) and Scanning Electrochemical Microscopy (SECM) results confirmed MICI was due to microbial aerobic respiration and deposited layers. Even in non-biological conditions, S. putrefaciens-induced calcium carbonate deposition could inhibit corrosion © 2023, The Authors. All rights reserved.

关键词： Scanning electron microscopy

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Research on External Characteristics for PMSG Wind Turbine Systems Under Symmetrical Fault

Research on External Characteristics for PMSG Wind Turbine S...

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Sustainable Power and Energy Conference (iSPEC)

作者： Hua Xie Qingchun Zhao Peilin Liu Xuesong Gao NARI Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China School of Electrical Engineering Shandong University Jinan China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

Wind turbines (WTs) are based on power electronic converters. Due to different control schemes of converters, WTs exhibit diverse external characteristics when grid symmetrical fault occurs. Thus, the output current and output power of WTs cannot be forecasted, which is a challenge for the power system stability. In this regard, this paper proposes a novel strategy for Permanent Magnetic Synchronous Generator (PMSG) wind turbine systems. The strategy aims to force the PMSG exhibit a stable EFC during grid fault and provide an output current reference to the power system. Besides, the proposed strategy aims at enhancing the low-voltage ride-through capability of the PMSG. The effectiveness and robustness of the proposed strategy is verified in DIgSILENT PowerFactory.

关键词： Power system stability Synchronous generators Robustness Power electronics Wind turbines Wind forecasting Power generation

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Inertial Response of Doubly-fed Induction Generator with the Phase-locked Loop

Inertial Response of Doubly-fed Induction Generator with the...

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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Mengqi, Qing Fei, Tang Dichen, Liu Mengjiao, Qing Weiqiang, Liang Wen, Jian Chufei, Xiao Fusuo, Liu School of Electrical Engineering Wuhan University Wuhan China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing China

ISBN: (纸本)9781728135205

With the development of wind power, the problem of system inertia and frequency dynamic deterioration caused by large-scale wind power integration is becoming more serious. The inertial response of wind turbines is worthy of attention and research. In this paper, the quantitative calculation method of the equivalent virtual inertia time constant HeqDFIG of the doubly-fed induction generator (DFIG) with the phase-locked loop (PLL) is studied, and the influence of the PLL on the inertial response of DFIG is analyzed. Firstly, a simplified model of DFIG with the PLL is established. By calculating the electromagnetic torque increment, the equivalent virtual inertia time constant HeqDFIG of the DFIG considering the dynamic characteristics of the PLL is obtained. And the influence of the PLL parameter variation on the virtual inertial response of the system is analyzed. Simulation verification proves the correctness of the conclusion. © 2019 IEEE.

关键词： Phase locked loops

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Permanent Magnet Biased Axial-radial Magnetic Bearing Design Based on the Accurate Magnetic Circuit

Permanent Magnet Biased Axial-radial Magnetic Bearing Design...

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International Conference on Power Electronics Systems and Applications (ICPESA)

作者： Shaoliang Zhou Min Zhang Jian Shen Bo Wang Xing Zhao Weinong Fu State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation (State Grid Electric Power Research Institute) Co. Ltd Nanjing China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation (State Grid Electric Power Research Institute) Co. Ltd Nanjing China School of Electrical Engineering Southeast University Nanjing China The Hong Kong Polytechnic University Hong Kong

ISBN: (数字)9781728188904

ISBN: (纸本)9781728188911

Permanent magnet biased axial-radial magnetic bearing (ARMB) can realize axial and radial suspension simultaneously. It has a compact configuration with the volume and weight reduced. However, its magnetic field distribution is quite complicated, its bias and control magnetic field are coupled. In order to design the magnetic bearing accurately, this paper divides the leakage and soft magnetic material routes according to the 2D FE simulation, establishes the accurate magnetic circuit including the leakage and soft magnetic material reluctance. The circuit can be used to observe the flux distribution in each route, verify and regulate the magnetic bearing structure parameter, so the FE computation efforts of the basic structure parameter are significantly reduced. An experimental sample was designed, 3D FE simulation and experiments were processed to test the prototype. The results confirm that the design method is reasonable and correct.

关键词： Prototypes Iron Permanent magnets Soft magnetic materials Integrated circuit modeling Magnetic circuits Magnetic levitation

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