Defesa P\u00fablica da Tese de Doutorado do Mestre em Engenharia El\u00e9trica Lucas Ara\u00fajo da Costa<\/p>\n\n\n\n
Data: 05\/06\/2023 – segunda-feira<\/p>\n\n\n\n
Hor\u00e1rio: 10h00min<\/p>\n\n\n\n
A defesa ser\u00e1 realizada atrav\u00e9s da plataforma Microsoft Teams com acesso pelo link:<\/p>\n\n\n\n Link alternativo para o caso de falha do primeiro: Mconf https:\/\/mconf.ufrgs.br\/webconf\/gmasp-ufrgs<\/a><\/p>\n\n\n\n Banca Examinadora:<\/p>\n\n\n\n Prof. Dr. Felipe Vigolvino Lopes – PPGER – UFPB – Relator T\u00edtle: “DEEPER ANALYSES ON FAULT LOCATION ON ELECTRIC POWER NETWORKS THROUGH THE METHOD ELECTROMAGNETIC TIME REVERSAL”<\/p>\n\n\n\n Abstract: “Fault location has been the object of research on power electric engineering for many decades. A great number of methods have been developed so far, exploring features regarding measured electrical quantities. Most of the methods can be classified into three or four types, concerning the way the fault locations are estimated. The research of other methods for fault-location estimation led to the application of the method so-called electromagnetic time reversal (EMTR). The EMTR method was developed and applied to different areas and types of problems before the studies on fault location. The method is based on the time-reversibility property of the equations of the electromagnetic waves in linear, non-dissipative, and time- and frequency-invariant media. Electrical power systems are linear media, and can be considered time- and frequency-invariant within a window of time relatively short. The non-dissipative condition is not fulfilled once real power systems have losses. However, previous studies have shown that the EMTR-based fault-location method works even in the presence of losses. The fault-induced travelling waves form the electromagnetic transients (EMTs), whose signal, whether of electrical current or voltage, is taken for the time-reversal transformation. The method\u2019s application is divided into direct- and reversed-time stages. In the former, the signal is recorded, and in the latter, the fault location is estimated by a metric. The present thesis aims the continuity of the research on the application of the EMTR method on fault location in power systems. Deeper analyses are performed to extend the knowledge in the literature about the method\u2019s effectiveness and the features that influence the method\u2019s behaviour. The method is first applied to a simple system through analytical formulations in the frequency domain as presented in the previous works. Then, the method is evaluated on the same simple system in the time domain, using the numerical model in a software of simulations of electromagnetic transients. More complex time-domain study cases are after considered through two more complex power systems. The first is a dc transmission link and the second is a power distribution network. Sophisticated models are used for the underground and overhead cables of the systems. Many fault simulations are performed, where the fault location and the fault resistance are varied. The cut-off frequency used to filter the fault-induced EMTs is changed, as well as the duration of the signal\u2019s recording. The dependence of the performance of the method on these features is shown. The relation to the spectral content of the signal is observed. The distance of the fault to the point where the signals are recorded is the main feature that can hamper the correct estimation of the fault location. From the analyses, the overall conclusion is that the EMTR method is not a good option for fault location in power systems. The method could not correctly estimate the location of faults farther than about 30 km from one or two points where the signals are recorded. More development of the method needs to be done for future applications in real systems.<\/p>\n\n\n\n Keywords: Electromagnetic Time Reversal, Electromagnetic Transients, Fault Location, HVDC Transmission, Power Distribution.”<\/p>\n","protected":false},"excerpt":{"rendered":" Defesa P\u00fablica da Tese de Doutorado do Mestre em Engenharia El\u00e9trica Lucas Ara\u00fajo da Costa Data: 05\/06\/2023 – segunda-feira Hor\u00e1rio: 10h00min A defesa ser\u00e1 realizada atrav\u00e9s da plataforma Microsoft Teams com acesso pelo link: Link alternativo para o caso de falha do primeiro: Mconf https:\/\/mconf.ufrgs.br\/webconf\/gmasp-ufrgs Banca Examinadora: Prof. Dr. Felipe Vigolvino Lopes – PPGER – UFPB… Continue a ler »Defesa de Tese de Doutorado – Lucas Ara\u00fajo da Costa<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[4],"tags":[],"class_list":["post-688","post","type-post","status-publish","format-standard","hentry","category-eventos"],"_links":{"self":[{"href":"https:\/\/www.ufrgs.br\/ppgee\/wp-json\/wp\/v2\/posts\/688","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ufrgs.br\/ppgee\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ufrgs.br\/ppgee\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ufrgs.br\/ppgee\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ufrgs.br\/ppgee\/wp-json\/wp\/v2\/comments?post=688"}],"version-history":[{"count":0,"href":"https:\/\/www.ufrgs.br\/ppgee\/wp-json\/wp\/v2\/posts\/688\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ufrgs.br\/ppgee\/wp-json\/wp\/v2\/media?parent=688"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ufrgs.br\/ppgee\/wp-json\/wp\/v2\/categories?post=688"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ufrgs.br\/ppgee\/wp-json\/wp\/v2\/tags?post=688"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
Profa. Dra. Ana Vukovic – Department of Electrical and Electronic Engineering of the University of Nottingham
Profa. Dra. Mariana Resener – PPGEE – UFRGS
Presidente da Banca: Prof. Dr. Daniel da Silva Gazzana – PPGEE – UFRGS
Coorientador: Prof. Dr. Roberto Chouhy Leborgne – PPGEE – UFRGS<\/p>\n\n\n\n