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High Impedance Fault Detection based on Stockwell Transform

High Impedance Fault Detection based on Stockwell Transform

引用

IEEE/PES Transmission and Distribution Conference and Exposition: Latin America

作者： Erica Mangueira Lima Rodrigo de Almeida Coelho Nubia Silva Dantas Brito Benemar Alencar de Souza Electrical Engineering Post Graduate Program Federal University of Campina Grande Campina Grande Brazil

A high impedance fault (HIF) detection method is proposed in this paper. Several parameters are extracted using the Stockwell transform, which is a relatively new multi-resolution tool with the ability to provide good resolution on both time and frequency domain, simultaneously. Those parameters are used to identify a HIF occurrence and distinguish it from other common disturbances such as capacitor banks switching, feeder energizing and solid faults. Two databases are used to validate the method, one with simulated data and one with real HIF oscillographic records, obtained from field experiments. A brief analysis of parameters behavior is also presented, since it is necessary for method's development. Results show the method is able to detect HIF on both simulated and real data in viable time, using only the substation as observation point. Also it can distinguish the fault from other tested disturbances.

关键词： Frequency-domain analysis Transforms Harmonic analysis Capacitors Solids Databases Impedance

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Single-Phase AC-DC-AC Five-level X-type Current Source Converter

Single-Phase AC-DC-AC Five-level X-type Current Source Conve...

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Brazilian Power Electronics Conference, COBEP

作者： Louelson A. Costa Montiê A. Vitorino Maurício B. R. Corrêa Post-Graduate Program in Electrical Engineering Federal University of Campina Grande Campina Grande Brazil

ISBN: (数字)9781728141800

ISBN: (纸本)9781728141817

In this paper a new single-phase AC-DC-AC five- level X-type current source converter is proposed. The use of the X-type topology reduces the conduction losses of the converter, whilst the five-level configuration may reduce the total harmonic distortion under lower frequencies, and allows the increase of the power capability of the converter. The novelty of this paper resides on the multilevel configuration being applied to a X-type current source converter. The operation and sine- triangle pulse-width modulation of the proposed converter are presented, as they are validated by simulation results. Besides that, experimental results for the rectifier side (AC-DC) are presented.

关键词： Topology Inductors Synchronization Switches Modulation Oscillators Inverters

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A noise-compensated estimation scheme for AR processes

A noise-compensated estimation scheme for AR processes

引用

IEEE Conference on Decision and Control

作者： R. Diversi R. Guidorzi U. Soverini Post-Graduate Program in Biotechnology Federal University of Espirito Santo Vitoria Brazil Post-Graduate Program in Electrical Engineering Federal University of Espirito Santo Vitoria Brazil Post-Graduate Program in Psychology Federal University of Espirito Santo Vitoria Brazil

This paper deals with the problem of identifying autoregressive models in presence of additive measurement noise. A new approach, based on some theoretical results concerning the so-called dynamic Frisch scheme, is proposed. This method takes advantage of both low and high order Yule-Walker equations and allows to identify the AR parameters and the driving and output noise variances in a congruent way since the estimates assure the positive definiteness of the autocorrelation matrix of the AR process. Simulation results are reported to show the effectiveness of the proposed procedure and compare its performance with those of other identification methods.

关键词： Equations Additive noise Autocorrelation Parameter estimation Noise measurement Signal processing Predictive models Speech analysis Geoscience Estimation error

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Hybrid open-end and NPC AC six-phase machine drive systems

Hybrid open-end and NPC AC six-phase machine drive systems

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作者： Melo, Victor F.M.B. Jacobina, Cursino B. Rocha, Nady Post-Graduate Program in Electrical Engineering - PPgEE COPELE UFCG Campina Grande Paraíba Brazil Electrical Engineering Department Federal University of Campina Grande - UFCG Campina Grande Paraíba Brazil Federal University of Paraíba - UFPB João Pessoa Paraíba Brazil

ISBN: (纸本)9781479956982

This paper presents two machine drive system based on a six-phase machine (SPM) and three-leg converters. The machine is composed of two three-phase groups. For the first configuration, one of the groups is connected to a three-leg converter and the other is connected to other two three-leg converters in an open-end winding configuration (see Fig. 4). For the second configuration, one of the groups is connected to a three-leg converter (similar to first one) and the other group is connected to a three-level NPC converter (see Fig. 5). Since the machine two groups are fed differently, the system topology is considered to be hybrid. The purpose of these topologies is to be an alternative configuration, being midway between the conventional six-leg inverter system (see Fig. 1) and the NPC six-leg inverter system (see Fig. 2) and Conventional twelve-leg Open-end inverter system (see Fig. 3). Compared with the conventional six-leg system, the proposed systems permits reducing the power processed by the semiconductor switches and their ratings, the dc-link voltage and the harmonic distortion. On the other hand, the proposed systems constitute less complex alternatives, compared with the open-end and NPC counterparts (see Fig. 3). PWM and control strategies are discussed. Simulation and experimental results are also presented. © 2014 IEEE.

关键词： Topology

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A Feasibility Investigation of Photo Voltaic Cell-Assisted Linke Hofmann Busch Coach Used in Indian Railways: A Case Study in Context to Present Scenario 2nd

A Feasibility Investigation of Photo Voltaic Cell-Assisted L...

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2nd International Conference on Functional Material, Manufacturing and Performances, ICFMMP 2021

作者： Barua, Abhishek Bagal, Dilip Kumar Jeet, Siddharth Pradhan, Swastik Baliarsingh, Asini Kumar Bagal, Deepak Kumar Department of Mechanical Engineering Centre for Advanced Post Graduate Studies BPUT Odisha Rourkela India Department of Mechanical Engineering Government College of Engineering Kalahandi Odisha Bhawanipatna India School of Mechanical Engineering Lovely Professional University Punjab Phagwara India Department of Electrical Engineering Government College of Engineering Kalahandi Odisha Bhawanipatna India Department of Electrical Engineering Veer Surendra Sai University of Technology Odisha Burla India

ISBN: (纸本)9789811941467

Indian Railway which is world’s 4th largest railway network by size operates more than 13,500 passenger trains daily which comprises of fleets of either ICF coaches or LHB coaches. Old aging ICF coaches are equipped with self-generation system of electricity to operate electrical equipment fitted inside them on its own. The Linke Hofmann Busch (LHB) coaches are more reliable in every aspect when compared to ICF coaches except in the case of self-electricity generation by individual coaches. Hence, LHB coaches have to rely on Head on Generation (HOG) or End on Generation (EOG) system for electricity supply inside the coaches. About 90% of LHB coaches’ trains have to dependent upon diesel generator driven EOG system. This investigation stats solar photovoltaic (PV) modules use in a LHB coach and how previous researchers have investigated the proficiency of this type of electricity generation technique earlier. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Railroads

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Single-phase AC-AC double-star chopper-cells (DSCC) converter without common DC-link capacitor

Single-phase AC-AC double-star chopper-cells (DSCC) converte...

引用

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Italo Roger F. M. P. da Silva Alexandre C. Oliveira Cursino B. Jacobina Post-graduate Program in Electrical Engineering - PPgEE/COPELE Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Brazil

This paper presents a single-phase AC-AC converter based on Modular Multilevel Cascade Converter (MMCC) with Double-Star Chopper-Cells (DSCC). This structure is composed by three DSCC-legs, the middle leg is shared, and also it does not present a common DC-link capacitor. It is suitable for regenerative low-power AC-AC conversion. The voltage-balancing control is presented to regulate the floating DC capacitor voltages. Furthermore, a grid current and terminal load voltage control is presented to correct the Power Factor (PF) and to ensure sinusoidal waveforms. Details about a designed 16-SM prototype are also presented. The experimental results allow validating the control strategies and the effectiveness of the proposed structure.

关键词： Voltage control Pulse width modulation Capacitors Topology Digital signal processing Inductance Inductors

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Three-phase drive systems based on OEW configurations with reduced controlled switch count

Three-phase drive systems based on OEW configurations with r...

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Brazilian Power Electronics Conference, COBEP

作者： Gregory A. A. Carlos Reuben P. R. Sousa Cursino B. Jacobina Joao P. R. A. Mello Luciano M. Barros Alexandre C. Oliveira Post-Graduate Program in Electrical Engineering - PPgEE Copele Department of Electrical Engineering Federal University of Campina Grande (UFCG) ParaIba Brazil

This paper proposes ten alternative drive topologies with reduced number of controlled switches. The topologies are composed by three-level (3L) and two-level (2L) legs combinations. All of them aim to feed a three-phase machine based on the concept of open-end-winding (OEW). Conventional OEW configurations are considered for comparison purposes. The proposed topologies are named accordingly to the number of levels associated in each leg. For example, a topology with one 3L leg and five 2L legs is named 322-222. The other configurations are named in a similar manner. The OEW based systems using proposed configurations aim to give intermediate alternative solution in terms of cost-benefit rather than using conventional configurations. Some simulation and experimental results are presented in order to validate the theoretical approaches.

关键词： Switches Legged locomotion Inverters Topology Pulse width modulation Windings

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Using Brain-Computer Interface to control an avatar in a Virtual Reality Environment

Using Brain-Computer Interface to control an avatar in a Vir...

引用

Biosignals and Biorobotics Conference (BRC), ISSNIP

作者： Berthil Borges Longo Alessandro Botti Benevides Javier Castillo Teodiano Bastos-Filho Post-Graduate Program in Biotechnology Universidade Federal do Esprito Santo Vitoria Brazil Post-Graduate Program in Electrical Engineering Universidade Federal do Esprito Santo Vitoria Brazil

The proposal of this research is to present the development of a tool that might be useful in rehabilitation, for subjects with disability, that suffer from some kind of limbs movement limitation. This tool carries a 3D Virtual Reality Environment (VRE), which emulates the movement of a healthy person, using the immersion of the subject through an avatar. To do so, and test its feasibility, pre acquired motor imagery signals were used to test the VRE as an off-line Brain Computer Interface (BCI) feedback. The subject's brain waves were captured by an Electroencephalography (EEG) equipment. For training the classifier, 45 trials, 25 seconds long, were used, and 15 trials for its validation. Five mental tasks were tested with the BCI, and the one with the best results (imagination of the manipulation of a cube) was used to move the avatar through a virtual room.

关键词： Electroencephalography Brain-computer interfaces Avatars Three-dimensional displays Legged locomotion Training

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Bio-inspired antenna for UWB systems

Bio-inspired antenna for UWB systems

引用

International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT)

作者： Paulo Fernandes da Silva Raimundo Carlos Silvério Freire Alexandre Jean René Serres Paulo Henrique Da Fonseca Silva Jefferson Costa e Silva Post-Graduate Program in Electrical Engineering - COPELE Federal University of Campina Grande UFCG Brazil Post-Graduate Program in Electrical Engineering - COPELE Federal University of Campina Grande UFCG Campina Grande Brazil Universidade Federal de Campina Grande Campina Grande PB BR Post-Graduate in Electrical Engineering PPGEE Federal Institute of Paraiba IFPB Brazil Post-Graduate in Electrical Engineering PPGEE Federal Institute of Paraiba IFPB Joao Pessoa Brazil

In this paper is presented a new printed monopole antenna, bio-inspired by jasmine flower, that meets the Federal Communications Commission parameters for ultra-wideband systems. The design of the printed monopole antenna in jasmine flower has developed from a printed monopole antenna with circular geometry, with comparison results. The measured results of bio-inspired antenna in the jasmine flower showed compatibility with the parameters required by the FCC for ultra-wideband technology. It obtained bandwidth of 9.75 GHz, half-power beamwidth of 148 degrees, omnidirectional radiation pattern, gain of 5.99 dBi, power spectral density below -41.3 dBm across the bandwidth of ultra-wideband technology, small pulse distortion, and constant group delay, with variations of less than 2ns.

关键词： FCC Ultra wideband antennas Antenna measurements Bandwidth Geometry Distortion Frequency measurement

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An assessment of rolled stainless steel angles under compression 7th

An assessment of rolled stainless steel angles under compres...

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7th International Conference on Structural engineering, Mechanics and Computation, 2019

作者： da Sirqueira, A.S. da Vellasco, P.C.G.S. de Lima, L.R.O. da Silva, A.T. Rodrigues, M.C. Vellasco, M.M.B.R. PGECIV-Civil Engineering Post-Graduate Program UERJ – State University of Rio de Janeiro Brazil Structural Engineering Department UERJ – State University of Rio de Janeiro Brazil Electrical Engineering Department PUC-Rio – Pontifical Catholic University of Rio de Janeiro Brazil

ISBN: (纸本)9781138386969

Stainless steel has been used in several types of constructions. Although many of their mechanical properties are similar to the properties of carbon steel, their nonlinear characteristics imply in different design rules. This non-linearity mainly affects the response to local and flexural buckling. The Eurocode 3: Part 1-4 (2006) stainless steel design standard can be applied to hot rolled, welded and cold formed products, but the provisions of this code are rather conservative, with a limited application due to the lack of experimental data. Thus, one of those areas that require attention and study concerns the behaviour of columns made of rolled stainless steel angles. This paper describes an experimental campaign made on rolled stainless steel angles under axial compression. The tests were performed on stainless steel rolled angles with lengths varying from 150 mm to 1400 mm while the collapse involved: flexural-torsional and flexural buckling modes. © 2019 Taylor & Francis Group, London, UK.

关键词： Hot rolling

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