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学者姓名：郑昕
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Abstract ：
随着分布式电源(distributed generation,DG)的容量变化，微电网原有的供电结构发生改变，使得潮流大小、方向和功率结构发生变化，对快速检测和定位微电网中的短路故障区域提出了挑战。在MATLAB/Simulink中搭建低压交流微电网模型；通过高尺度小波能量谱算法对微电网与大电网公共连接点(point of common coupling,PCC)处检测到的电流进行分解，提取适应不同容量情况的短路故障特征值，实现了不同容量下微电网短路故障的早期检测；利用小波能量谱特征结合基于正交最小二乘法(orthogonal least square,OLS)的径向基函数(radial basis function,RBF)神经网络算法提出一种适用于不同容量微电网的短路故障区域定位方法，并进行仿真验证；在此基础上设计并网模式微电网短路故障保护硬件系统，并进行实验验证。结果表明，所设计的保护系统能够快速、准确地同时实现并网模式下交流微电网短路故障的早期检测与区域定位。
Keyword ：
区域定位 区域定位 小波能量谱 小波能量谱 并网模式微电网 并网模式微电网 径向基函数(RBF) 径向基函数(RBF) 早期检测 早期检测 正交最小二乘法(OLS) 正交最小二乘法(OLS) 短路故障 短路故障
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| GB/T 7714 | 郑昕 , 甘鸿浩 . 不同容量下并网模式交流微电网短路故障早期检测与区域定位 [J]. | 中国电机工程学报 , 2024 , 44 (11) : 4353-4367 . |
| MLA | 郑昕 等. "不同容量下并网模式交流微电网短路故障早期检测与区域定位" . | 中国电机工程学报 44 . 11 (2024) : 4353-4367 . |
| APA | 郑昕 , 甘鸿浩 . 不同容量下并网模式交流微电网短路故障早期检测与区域定位 . | 中国电机工程学报 , 2024 , 44 (11) , 4353-4367 . |
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Cable accessory has the interface formed by cross-linked polyethylene (XLPE)/silicone rubber (SiR), which is prone to surface discharge and thus causes the failure of cable system. This article conducts the simulated experiment of thermal-mechanical aging on the interface of XLPE/SiR. The interfacial breakdown and dielectric properties under different aging states are analyzed. It is found the interfacial aging process of XLPE can be divided into the recrystallization stage and the oxidation reaction stage. The former contributes to the interfacial roughness and thus the better insulating performance, whereas the latter leads to degradation of interface, and thus the worse insulating performance. In addition, combined with the established electric field model for the interface, the differences between thermal-mechanical aging and individual thermal aging on the interface are discussed. The sample under thermal-mechanical aging reaches the maximum interfacial breakdown voltage later than that under individual thermal aging, but their performance tends to be consistent in the later stage of aging. The change of interface microstructure and its effects on electric properties of cross-linked polyethylene/silicone rubber under thermal-mechanical aging.image
Keyword ：
cable accessory cable accessory cross-linked polyethylene cross-linked polyethylene interface interface physicochemical properties physicochemical properties thermal-mechanical coupling aging thermal-mechanical coupling aging
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| GB/T 7714 | Zhang, Tianfeng , Zhang, Yunxiao , Zheng, Xin et al. Mechanistic insights into the thermal-mechanical aging of the interface of cross-linked polyethylene/silicone rubber [J]. | JOURNAL OF APPLIED POLYMER SCIENCE , 2023 , 141 (12) . |
| MLA | Zhang, Tianfeng et al. "Mechanistic insights into the thermal-mechanical aging of the interface of cross-linked polyethylene/silicone rubber" . | JOURNAL OF APPLIED POLYMER SCIENCE 141 . 12 (2023) . |
| APA | Zhang, Tianfeng , Zhang, Yunxiao , Zheng, Xin , Lin, Wenxin , Zhang, Zenghui , Chi, Zhengnan et al. Mechanistic insights into the thermal-mechanical aging of the interface of cross-linked polyethylene/silicone rubber . | JOURNAL OF APPLIED POLYMER SCIENCE , 2023 , 141 (12) . |
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Abstract ：
Due to the issues of multi-layer insulation coordination, the interface of cable accessories is prone to surface discharge and breakdown, which are the weakest link in the power cable system. The discharge model of composite dielectric interface is established. This article investigates the variation of breakdown voltage at the interface of XLPE/SiR double-layer dielectric under different interfacial roughness and pressures. The results indicate that the higher the interfacial roughness, the lower the interfacial breakdown voltage; the higher the interfacial pressure, the higher the interfacial breakdown voltage. In addition, considering the model, the quantitative relationships between breakdown voltage and roughness and pressure are established respectively. Finally, the interfacial breakdown mechanism is explained. © 2023 IEEE.
Keyword ：
Cable sheathing Cable sheathing Electric breakdown Electric breakdown Insulation Insulation Multiphysics Multiphysics
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| GB/T 7714 | Zhang, Tianfeng , Zhang, Yunxiao , Zheng, Xin et al. Interfacial Breakdown Characteristics and Its Physical Model of Cable Accessories under Multiphysics Fields [C] . 2023 . |
| MLA | Zhang, Tianfeng et al. "Interfacial Breakdown Characteristics and Its Physical Model of Cable Accessories under Multiphysics Fields" . (2023) . |
| APA | Zhang, Tianfeng , Zhang, Yunxiao , Zheng, Xin , Lin, Wenxin , Chi, Zhengnan , Zhang, Jiarui . Interfacial Breakdown Characteristics and Its Physical Model of Cable Accessories under Multiphysics Fields . (2023) . |
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With the development of microgrid technology, short-circuit fault detection and location research has become a key link in the development of microgrid technology. In view of the limitation that the existing short-circuit fault protection schemes of micro grid do not consider the change of topology structure during the operation of micro grid, this paper simulates the short-circuit fault operation state of grid-connected AC microgrid considering the change of topology structure, and analyzes it by using the wavelet energy spectrum change method, proposes a short-circuit fault protection method that can adapt to the change of topology structure. © 2023 IEEE.
Keyword ：
Fault detection Fault detection Microgrids Microgrids Timing circuits Timing circuits Topology Topology
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| GB/T 7714 | Wen, Zhuofan , Zheng, Xin . Simulation Research on Short-Circuit Fault Protection of Grid-Connected AC Microgrid Considering Topology Change [C] . 2023 . |
| MLA | Wen, Zhuofan et al. "Simulation Research on Short-Circuit Fault Protection of Grid-Connected AC Microgrid Considering Topology Change" . (2023) . |
| APA | Wen, Zhuofan , Zheng, Xin . Simulation Research on Short-Circuit Fault Protection of Grid-Connected AC Microgrid Considering Topology Change . (2023) . |
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As far as low voltage AC arc is concerned, there is a close relationship between its micro state and macro state. Previous studies have shown that there is a correlation between the characteristic parameters of wavelet energy spectrum of arc voltage and arc burning trend, but there is a lack of theoretical elaboration and verification. In this paper, from the perspective of spectral analysis, an arc generation platform with spectral measurement function is built to realize the real-time measurement of plasma spectral line information in the arc gap. And the electron temperature and density of the arc are calculated by the Boltzmann diagram method and Stark broadening method, and their data trajectories in the whole arcing process are recorded. The comparison between the data trajectory and the wavelet energy time spectrum of arc voltage shows that the wavelet energy spectrum eigenvalue is feasible in theory as the macroscopic characterization parameter of arc state. Finally, the wavelet energy time spectrum of the new intelligent contactor at different breaking speeds is extracted and analyzed to verify the practicability of this macro characterization parameters. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
Keyword ：
Eigenvalues and eigenfunctions Eigenvalues and eigenfunctions Electron temperature Electron temperature Parameter estimation Parameter estimation Spectroscopy Spectroscopy Spectrum analysis Spectrum analysis Wavelet analysis Wavelet analysis
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| GB/T 7714 | Huang, Zhi-ang , Zheng, Xin , Shan, Xiaojie . Exploration of Macroscopic Characterization for Low-Voltage AC Arc State [C] . 2022 : 694-700 . |
| MLA | Huang, Zhi-ang et al. "Exploration of Macroscopic Characterization for Low-Voltage AC Arc State" . (2022) : 694-700 . |
| APA | Huang, Zhi-ang , Zheng, Xin , Shan, Xiaojie . Exploration of Macroscopic Characterization for Low-Voltage AC Arc State . (2022) : 694-700 . |
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为解决交流系统中电弧状态的准确检测、定量表征以及电弧电压在零后极短时间内变化特征不易识别等问题,提出一种基于不同小波变换特征的交流电弧识别模型。针对串联故障电弧和开关电弧的时频特征,分别构建了正交小波和二进小波两种识别模型并验证了其有效性。引入能量概念并结合二进小波,构建了小波能量谱模型,对开关电弧电压波形进行实际采集和分析,实现对不同负载条件下开关电弧状态的定量表征。仿真和实验结果表明,基于小波分析的交流电弧识别模型在电弧的特征识别与提取方面具有良好的效果,为电弧故障诊断和开关电弧在线监测的实现提供了理论基础和思路。
Keyword ：
串联故障电弧 串联故障电弧 小波识别模型 小波识别模型 开关电弧 开关电弧 电压波形特征 电压波形特征 能量谱 能量谱
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| GB/T 7714 | 单潇洁 , 郑昕 . 基于小波分析的低压电弧特性识别模型的研究 [J]. | 电器与能效管理技术 , 2021 , (06) : 7-14 . |
| MLA | 单潇洁 et al. "基于小波分析的低压电弧特性识别模型的研究" . | 电器与能效管理技术 06 (2021) : 7-14 . |
| APA | 单潇洁 , 郑昕 . 基于小波分析的低压电弧特性识别模型的研究 . | 电器与能效管理技术 , 2021 , (06) , 7-14 . |
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Needle selector is an executive component of computerized flat knitting machine used to implement needle selection control. It is found that there are problems of missed and wrong selection in the actual working process. In this paper, a novel single-stage electromagnetic needle selector with E-type structure was designed by using ANSYS Maxwell. And PWM control technology was applied to the excitation driving circuit of this needle selector. The analysis and experiment show that the new needle selector can effectively reduce the occurrence of wrong and missed needle selection, and also save the material cost. This research can provide theoretical guidance for the improvement of the product process and driving module of the needle selector, and better practical application value. © 2021 IEEE.
Keyword ：
Energy management Energy management Energy resources Energy resources Needles Needles
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| GB/T 7714 | Zhao, Fumin , Zheng, Xin , Zhang, Guoli . Design and Simulation Analysis of a Novel Single-stage Electromagnetic Needle Selector [C] . 2021 . |
| MLA | Zhao, Fumin et al. "Design and Simulation Analysis of a Novel Single-stage Electromagnetic Needle Selector" . (2021) . |
| APA | Zhao, Fumin , Zheng, Xin , Zhang, Guoli . Design and Simulation Analysis of a Novel Single-stage Electromagnetic Needle Selector . (2021) . |
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With the rapid development of microgrid and large-scale grid-connected operation, the detection and location of short-circuit faults in microgrid has become a bottleneck. In this paper, a simulation model of short-circuit fault in low-voltage AC microgrid is built on PSCAD/EMTDC. The characteristics of current wavelet energy spectrum under various short-circuit fault states are studied and the early detection of faults is realized. Based on the relationship between the first peak value of fault current wavelet energy spectrum and the location of short-circuit points, a method for early detection and area location of short-circuit faults in microgrid is proposed. The simulation and experimental results show that this method can detect and locate the short-circuit fault area of microgrid quickly and accurately.
Keyword ：
area location area location Circuit faults Circuit faults early detection early detection Fault detection Fault detection Load modeling Load modeling Microgrid Microgrid Microgrids Microgrids short-circuit fault short-circuit fault Wavelet analysis Wavelet analysis Wavelet domain Wavelet domain wavelet energy spectrum wavelet energy spectrum Wind turbines Wind turbines
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| GB/T 7714 | Zheng, Xin , Zeng, Yue , Zhao, Ming et al. Early Identification and Location of Short-Circuit Fault in Grid-Connected AC Microgrid [J]. | IEEE TRANSACTIONS ON SMART GRID , 2021 , 12 (4) : 2869-2878 . |
| MLA | Zheng, Xin et al. "Early Identification and Location of Short-Circuit Fault in Grid-Connected AC Microgrid" . | IEEE TRANSACTIONS ON SMART GRID 12 . 4 (2021) : 2869-2878 . |
| APA | Zheng, Xin , Zeng, Yue , Zhao, Ming , Venkatesh, Bala . Early Identification and Location of Short-Circuit Fault in Grid-Connected AC Microgrid . | IEEE TRANSACTIONS ON SMART GRID , 2021 , 12 (4) , 2869-2878 . |
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由于传统电力线缆巡检需传感器与待测电缆接触,影响线路的结构参数,以及非接触测量传感器的精度影响其应用,提出了一种基于波形分析的非接触巡检方法。利用多点非接触电压传感器的测量波形,实现低压配电电缆的错接检测与探损,降低单个非接触式电压传感器测量精度带来的影响。利用Ansoft Maxwell进行建模仿真,确定圆筒形的结构最为合适,并通过对不同规格圆筒形感应电极的仿真分析其影响因素;在空载和带载条件下,对传感器线性度和稳定性进行了实验分析。结果表明所提出的方法可以有效实现电缆的探损和错接检测。
Keyword ：
仿真分析 仿真分析 电压传感器 电压传感器 电缆巡检 电缆巡检 非接触 非接触
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| GB/T 7714 | 林成镇 , 郑昕 . 低压配电电缆巡检用非接触式电压传感器的仿真与实验分析 [J]. | 电器与能效管理技术 , 2020 , (07) : 1-7 . |
| MLA | 林成镇 et al. "低压配电电缆巡检用非接触式电压传感器的仿真与实验分析" . | 电器与能效管理技术 07 (2020) : 1-7 . |
| APA | 林成镇 , 郑昕 . 低压配电电缆巡检用非接触式电压传感器的仿真与实验分析 . | 电器与能效管理技术 , 2020 , (07) , 1-7 . |
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利用LabVIEW软件设计了低压配网虚拟仿真系统,通过虚拟仪器技术将断路器等开关设备动作特性和运行过程虚拟化,并构建了各类型故障仿真波形数据库和分析数据库。可根据需要利用虚拟的开关设备、配网模型以及波形数据搭建低压配电网实现虚拟仿真和硬件测试,为低压系统分析提供了实用的仿真与测试平台。
Keyword ：
开关设备 开关设备 数据库 数据库 虚拟仿真 虚拟仿真 配电网 配电网
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| GB/T 7714 | 黄海腾 , 郑昕 . 低压配电网虚拟仿真系统的设计 [J]. | 电器与能效管理技术 , 2020 , (12) : 99-104 . |
| MLA | 黄海腾 et al. "低压配电网虚拟仿真系统的设计" . | 电器与能效管理技术 12 (2020) : 99-104 . |
| APA | 黄海腾 , 郑昕 . 低压配电网虚拟仿真系统的设计 . | 电器与能效管理技术 , 2020 , (12) , 99-104 . |
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