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Effects of Corona Discharge from the Grounding Tip on Charge Evolution of Wall Bushing

IEEE Transactions on Power Delivery 2025年第3期40卷 1682-1693页

作者： Bai, Zheng Zhou, Yuanxiang Zhang, Yunxiao Huang, Xin Xie, Xiongjie Liu, Taiwei Tsinghua University State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Beijing100084 China Electric Power Research Institute State Key Laboratory of Power Grid Environmental Protection Wuhan430204 China

Manufacturers consider that the grounding tip near the wall bushing flange is a potentially important factor in several sheath perforation accidents. Taking a ±100 kV true type SF6 gas-insulated bushing as a typical wall bushing, this paper tests the impact of the nearby grounding tip on the charge accumulation. Based on the experiment results, we propose the three-dimensional nonlinear conduction model to unravel the charge accumulation process and the three-dimensional corona ion migration model to clarify the corona process. It is concluded that the consumption of gas ions leads to the nonlinear charge relaxation process. When the corona of grounding tip incepts, numerous ions are generated, forming an "overcharge" phenomenon. The electric field at the insulator-sheds interface and the SF6-insulator interface increases compared to the normal condition, with non-uniform distribution along the circumferential direction. Material inhomogeneity amplifies electric field distortion and creates insulation weaknesses, making insulation aging more likely and potentially leading to a slowly developing electrical tree breakdown process. The length of the needle tip affects the duration of the corona effect;an excessively long needle tip can cause a sustained corona discharge. This research provides a foundation for bushing accidents analysis and operation reliability improvement. © 1986-2012 IEEE.

关键词： Bushings

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A Line protection Method Based on Dual Terminal Dynamic System Impedance 9th

A Line Protection Method Based on Dual Terminal Dynamic Syst...

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9th Purple Mountain Form on smart grid protection and control, PMF 2024

作者： Yu, Hong Wu, Chenke Zhang, Yichi Wu, Tonghua Dai, Wei Li, Hongxia Yang, Libin State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China NARI Group Corporation Nanjing211106 China College of Energy and Electrical Engineering Hohai University Nanjing210098 China State Grid Qinghai Electric Power Company Xining810000 China

ISBN: (纸本)9789819616701

Affected by its control strategy, the output characteristics and fault characteristics of the inverter-interfaced distributed generations (IIDG) are different from those of synchro during the fault period, and the differential protection criteria applied to transmission lines cannot be directly transplanted into the distribution network. To solve the above problems, the fault characteristics of the inverter power supply are analyzed through the control strategy during the fault period, and a method to improve the sensitivity of line protection based on two-terminal dynamic impedance is proposed. The method uses the virtual part of the impedance of the two-end system and the line to construct the criterion, which avoids the influence of the traditional longitudinal differential protection on the current amplitude and phase relationship at both ends. Finally, PSCAD simulation software is used to build a 10 kV active distribution network model. The simulation results show that compared with the traditional current longitudinal differential protection, the proposed method has the advantages of high sensitivity, reliability, and strong resistance to transition resistance. © state grid Electric Power 2025.

关键词： Relay protection

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Simultaneous catalytic removal of NO and chlorobenzene over Mn-Ce-Sm-Sn-O_x/P84 composite catalytic filter

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Journal of Rare Earths 2025年第3期43卷 526-533,I0004页

作者： Mutao Xu Liguo Chen Xinpei Cheng Qijie Jin Ranran Zhou Jian Yang Chengzhang Zhu Sheng Wang Haitao Xu School of Environmental Science and Engineering Nanjing Tech UniversityNanjing210009China State Key Laboratory for Clean and Efficient Coal-fired Power Generation and Pollution Control State Key Laboratory of Low-carbon Smart Coal-fired Power Generation and Ultra-clean EmissionNanjing210046China College of Materials Science and Engineering Nanjing Tech UniversityNanjing210009China State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing210009China Nanjing Gekof Institute of Environmental Protection Technology&Equipment Co. Nanjing210031China

The integration of surface filtration and catalytic decomposition functions in catalytic bags enables the synergistic removal of multiple pollutants(such as dust,nitrogen oxide,acid gases,and dioxins)in a single reactor,thus effectively reducing the cost and operational difficulties associated with flue gas *** this study,Mn-Ce-Sm-Sn(MCSS)catalysts were prepared and loaded onto hightemperature resistant polyimide(P84)filter through ultrasonic impregnation to create composite catalytic *** results demonstrate that the NO conversion rates of the composite catalytic filter consistently achieve above 95%within the temperature range of 160-260℃,with a chlorobenzene T_(90)value of 230℃.The ultrasonic impregnation method effectively loaded the catalyst onto the filter,ensuring high dispersion both on the surface and inside the *** increased exposure of catalyst active sites enhances the catalytic activity of the composite catalytic ***,increasing the catalyst loading leads to a gradual decrease in permeability,an increase in pressure drops and the long residence time of the flue gas,thereby improving catalytic *** to ordinary impregnation methods,ultrasonic impregnation improves the bonding strength between the catalyst and filter,as well as the permeability of the composite catalytic filter under the same loading ***,this study presents a novel approach to prepare composite catalytic filter for the simultaneous removal of NO and chlorobenzene at low temperatures.

关键词： Compound catalytic filter Simultaneous catalysis Polyimide fibers Ultrasonic impregnation Rare earths

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A Cost-Oriented Score Evaluation Index to Align Probabilistic Forecasting and Uncertain Decision-Making in Power Systems

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IEEE Transactions on Power Systems 2025年第2期40卷 1981-1984页

作者： Yan, Xinyue Zhang, Haipeng Li, Ran Wan, Can Nengling, Tai Sun, Yongchao Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai200240 China Shanghai Jiao Tong University College of Smart Energy Shanghai200240 China Ministry of Education Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Shanghai200240 China Shanghai Non-Carbon Energy Conversion and Utilization Institute Shanghai200240 China Zhejiang University College of Electrical Engineering Hangzhou310027 China Southwest Branch of State Grid Corporation of China Chengdu610095 China

Existing research has shown the inconsistency between point forecasting and deterministic optimization, yet the consistency between probabilistic forecast indices and uncertain optimization has not been investigated. This letter fills this gap by undertaking scenario-based tests to reveal the mismatch and proposing a new cost-oriented score (COS) to indicate whether a probabilistic forecast can lead to a "better"decision-making performance in unit commitment and economic dispatch. © 1969-2012 IEEE.

关键词： Costs Probabilistic logic Forecasting Uncertainty Decision making Standards Indexes Optimization Predictive models Real-time systems

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Discontinuous Modulation and control Strategy for Single-Phase LC Inverter

Discontinuous Modulation and Control Strategy for Single-Pha...

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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Xu, Wei Song, Shengli Long, Xuehan Miao, Yiru Tang, Mengyang Chongqing Sub-Bureau of Southwest China Regional Air Traffic Management Bureau CAAC Chongqing401120 China Chongqing Airport Group Company Chongqing400044 China State Key Laboratory of Power Transmission Equipment Technology Chongqing University Chongqing400044 China Key Laboratory of Smart Grid and Intelligent Control in Nanchong Southwest Petroleum University Nanchong637001 China

ISBN: (纸本)9789819620791

In order to reduce the switching loss of the single-phase inverter, improve the efficiency and power density, a discontinuous PWM modulation strategy based on the unified modulation method is proposed for the single-phase full bridge LC inverter. The differential mode modulation signal between a-phase and b-phase is constant, the common mode modulation signal is adjusted and injected into the modulation signals of a-phase and b-phase, the switching devices of a-phase and b-phase are in inactive state alternating, so the switching loss can be reduced. Then, the mathematical model of the single-phase full bridge LC inverter is established, the parameter design method of the single loop proportional resonant controller is studied according to the amplitude-frequency characteristic curve, the output voltage can track the reference signal without error under the disturbances of input voltage and load. Finally, the experiment is carried out, which shows that the switching loss can be reduced by the proposed discontinuous PWM modulation, and high quality and precision voltage output can be obtained by the single loop proportional resonant controller. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Pulse width modulation

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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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In-situ Monitoring of Maximum and Average Chip Junction Temperature within Multichip IGBT Power Modules Using Kelvin Emitter Voltage

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IEEE Journal of Emerging and Selected Topics in Power Electronics 2025年

作者： Yang, Jianxiong Ran, Li Che, Yanbo Du, Mingxing Tianjin University of Technology Tianjin Key Laboratory of Control Theory and Applications in Complicated System Tianjin300384 China Chongqing University State Key Laboratory of Power Transmission Equipment and System Security and New Technology School of Electrical Engineering Chongqing400044 China University of Warwick School of Engineering CoventryCV4 7AL United Kingdom Tianjin University Key Laboratory of Smart Grid of Ministry of Education School of Electrical and Information Engineering Tianjin300072 China

Parallel configurations of power chips within a multichip IGBT power module (M-IGBT-PM) are employed to meet the required current and power ratings. When the internal chips of an M-IGBT-PM experience uneven temperature distributions and package aging, it becomes challenging to determine the maximum and average temperatures of the chips within the module. This paper investigates the relationship between four transient thermal-sensitive electrical parameters (T-TSEPs) derived from the Kelvin emitter voltage and the chip junction temperature, while establishing relevant mathematical models. It compares the sensitivity and linearity of these four T-TSEPs, and also assesses the influence of external gate resistance, bus voltage, and load current on each of them. A key innovation in this paper is the proposal of a method for monitoring the maximum and average temperatures across the chips within the M-IGBT-PM, which is not influenced by the load current. The experimental results suggest that the temperature derived from the quasi-turn-on delay time is a good approximation of the maximum chip temperature, whereas the temperatures predicted by the other T-TSEPs are nearer to the average temperature. © 2025 IEEE.

关键词： Insulated gate bipolar transistors (IGBT)

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Modeling and Calculation of Core Loss and Heat Distribution in Ultra-Thin Wound Core Reactor Based on Electromagnetic and Fluid-Thermal Coupling

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IEEE Transactions on Magnetics 2025年

作者： Yuan, Jiaxin Li, Xuzhe Zhou, Hang Muramatsu, Kazuhiro State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and Automation Wuhan University Wuhan430072 China School of Electrical Engineering and Automation Wuhan University Wuhan430072 China Laboratory of Hydro-Wind-Solar Multi-Energy Control Coordination Wuhan University Wuhan China Department of Electrical and Electronic Engineering Saga University Saga840-8502 Japan

The anode saturable reactor (ASR) is a critical component in converter valves for protecting thyristors. In recent years, fault issues caused by abnormal heating have received widespread attention. However, the complex structure of the ASR presents a significant challenge for accurate temperature rise calculations. This study focuses on an ETT-type ASR and establishes a comprehensive electromagnetic-thermal-flow simulation model. The improved Bertotti loss separation model is applied to calculate core losses, and time-averaged losses are used as the heat source coupled to the temperature field to address the mismatch between the time scales of losses and temperature rise. The temperature distribution of multiple core pairs in the ASR is solved based on a fluid-thermal coupling method and compared with three other methods. Experimental results show that under normal operating conditions, the core temperature of the ASR is approximately 75°C, with slight temperature differences observed across the cores. The proposed heat calculation model provides more accurate results than other models. © 2015 IEEE.

关键词： Saturable core reactors

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Fast Distance protection Scheme for Wind Farm Transmission Lines Considering R-L and Bergeron Models

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Journal of Modern Power Systems and Clean Energy 2023年第3期11卷 840-852页

作者： Zepeng Hu Bin Li Yuping Zheng Tonghua Wu Jiawei He Bin Yao Yaru Sheng Wei Dai Xindong Li Electrical Engineering and Automation Tianjin UniversityTianjinChina State Key Laboratory of Smart Grid Protection and Control NARI Group CorporationNanjingChina

The distributed capacitance of the line becomes larger as the scale of wind farms,the transmission voltage level,and the transmission distance ***,the error of the traditional time-domain distance protection scheme based on the R-L model,which ignores the distributed capacitance of the line,becomes ***,the error of the time-domain fault location method based on the R-L model,especially the maximum error range,is theoretically analyzed in this *** this basis,a novel fault location method based on the RL and Bergeron models is ***,a fast time-domain distance protection scheme is *** the proposed scheme,the error in the fitting calculation is used to construct a weight matrix,and an algorithm for solving the time-domain differential equations is designed to improve the calculation speed and *** with the traditional frequency-domain distance protection scheme,the proposed scheme is independent of the power supply characteristics;thus,it is suitable for wind farm transmission *** addition,compared with the traditional method based on the R-L model,the proposed scheme effectively avoids the negative influence of the distributed capacitance of the line,which significantly improves the operating *** types of faults are simulated by PSCAD/EMTDC to verify the effectiveness and superiority of the proposed scheme.

关键词： Transmission line R-L model time-domain distance protection wind farm

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Typical Influence of Wind Power Capacity Expansion on the Transient Angle Stability and Feasible Explanations

Typical Influence of Wind Power Capacity Expansion on the Tr...

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2020 IEEE Sustainable Power and Energy Conference, iSPEC 2020

作者： Huang, Tiangang State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (纸本)9781728191645

The high proportion of renewable energy into the power grid, say, the large-scale wind power generation connected to the power grid, is the key approach to achieve the clean and low-carbon energy transition. Under the premise of ensuring power grid's safe and stable operation, it is necessary to study the influence of wind power capacity expansion on the transient angle stability (TAS). Aiming at several typical dominant modes in Qinghai power system, which holds many new energy resources, the sensitivity of wind power capacity expansion in different locations to the TAS, as well as its key influence factors and feasible explanations, are explored. It may lay the foundation of the location optimization of wind power capacity expansion. © 2020 IEEE.

关键词： Transients

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