To address the challenges of fault line identification and low detection accuracy of wave head in Fault Location(FL)research of distribution networks with complex topologies,this paper proposes an FL method of Multi-B...To address the challenges of fault line identification and low detection accuracy of wave head in Fault Location(FL)research of distribution networks with complex topologies,this paper proposes an FL method of Multi-Branch distribution line based on Maximal Overlap Discrete Wavelet Transform(MODWT)combined with the improved Teager Energy Operator(TEO).Firstly,the current and voltage Traveling Wave(TW)signals at the head of each line are extracted,and the fault-induced components are obtained to determine the fault line by analyzing the polarity of the mutation amount of fault voltage and current TWs.Subsequently,the fault discrimination mark is calculated based on the fault-induced line-mode current and the zero-mode voltage,with the fault type determined by comparing each mark’s value against the fault discrimination table,transforming the FL problem in complex topology into a single-line FL problem.Finally,the fault voltage TW is extracted fromthe fault line,and the wave head detection method based on MODWT combined with improved TEO is used to precisely identify the arrival instants of both the first TW wave head and its first reflection at each line terminal,and then the FL result is calculated by applying the double-ended TW ranging formula that removes the influence of wave velocity.Simulation results demonstrate that the proposed method accurately identifies the fault line and types of faults occurring and maintains the ranging accuracy within 0.5%under various fault scenarios.展开更多
在健康中国战略的背景下,以创造支持性环境和实现社会公平正义为导向的“主动促进”,已成为风景园林学科在深化人与自然和谐关系上的新议题。为此,本文引入公共健康领域的“扩大、延伸、增强的机会理论”(即TEO,the theory of expanded,...在健康中国战略的背景下,以创造支持性环境和实现社会公平正义为导向的“主动促进”,已成为风景园林学科在深化人与自然和谐关系上的新议题。为此,本文引入公共健康领域的“扩大、延伸、增强的机会理论”(即TEO,the theory of expanded,extended,and enhancedopportunities),利用该理论对现有“自然—健康”的实证成果进行梳理,提出了TEO概念下自然环境对公共健康的主动促进框架,在“健康绩效”和“健康公平”的核心目标下,从扩大自然接触的积极影响、增强环境体验的感知能力、和延伸社会协同的服务方向三方面阐述了促进过程中的关键路径。旨在获得不同蓝绿空间的要素资源对个体健康水平的最大促进绩效,采取多层设计与多元评价加强群体水平的健康公平,为未来健康人居环境的体制建构、利益相关者的共同参与、和规划管理政策的有效落地提供参考。展开更多
基金funded by the project of Guizhou Power Grid Co.,Ltd.Guiyang Power Supply Bureau(No.GZKJXM20232317).
文摘To address the challenges of fault line identification and low detection accuracy of wave head in Fault Location(FL)research of distribution networks with complex topologies,this paper proposes an FL method of Multi-Branch distribution line based on Maximal Overlap Discrete Wavelet Transform(MODWT)combined with the improved Teager Energy Operator(TEO).Firstly,the current and voltage Traveling Wave(TW)signals at the head of each line are extracted,and the fault-induced components are obtained to determine the fault line by analyzing the polarity of the mutation amount of fault voltage and current TWs.Subsequently,the fault discrimination mark is calculated based on the fault-induced line-mode current and the zero-mode voltage,with the fault type determined by comparing each mark’s value against the fault discrimination table,transforming the FL problem in complex topology into a single-line FL problem.Finally,the fault voltage TW is extracted fromthe fault line,and the wave head detection method based on MODWT combined with improved TEO is used to precisely identify the arrival instants of both the first TW wave head and its first reflection at each line terminal,and then the FL result is calculated by applying the double-ended TW ranging formula that removes the influence of wave velocity.Simulation results demonstrate that the proposed method accurately identifies the fault line and types of faults occurring and maintains the ranging accuracy within 0.5%under various fault scenarios.
文摘在健康中国战略的背景下,以创造支持性环境和实现社会公平正义为导向的“主动促进”,已成为风景园林学科在深化人与自然和谐关系上的新议题。为此,本文引入公共健康领域的“扩大、延伸、增强的机会理论”(即TEO,the theory of expanded,extended,and enhancedopportunities),利用该理论对现有“自然—健康”的实证成果进行梳理,提出了TEO概念下自然环境对公共健康的主动促进框架,在“健康绩效”和“健康公平”的核心目标下,从扩大自然接触的积极影响、增强环境体验的感知能力、和延伸社会协同的服务方向三方面阐述了促进过程中的关键路径。旨在获得不同蓝绿空间的要素资源对个体健康水平的最大促进绩效,采取多层设计与多元评价加强群体水平的健康公平,为未来健康人居环境的体制建构、利益相关者的共同参与、和规划管理政策的有效落地提供参考。
