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High Impedance Fault Detection based on Stockwell Transform

High Impedance Fault Detection based on Stockwell Transform

引用

2018 IEEE PES Transmission and Distribution Conference and Exhibition - Latin America, T and D-LA

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

ISBN: (纸本)9781538658444

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. © 2018 IEEE.

关键词： Frequency domain analysis

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Hybrid Converter with Reduced DC-link Voltage Using an H-Bridge Cell for Split-Phase Power System

Hybrid Converter with Reduced DC-link Voltage Using an H-Bri...

引用

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Bruna S. Gehrke Cursino B. Jacobina Italo R. F. M. P. da Silva Reuben P. R. Sousa Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Federal University of Campina Grande (UFCG) – Campina Grande - PB - Brazil Academy Unit of the Cabo de Santo Agostinho Federal Rural University of Pernambuco (UFRPE) Cabo de Santo Agostinho PE Brazil

ISBN: (数字)9781728158266

ISBN: (纸本)9781728158273

This paper presents a single-phase to single-phase three-wire converter, which comprises a conventional two-level(2L) four-leg converter in series with H-bridge. The H-bridges are supplied from the main converter by means of a DC-DC converter with a high-frequency transformer. The proposed converter: (i) can supply three loads, wherein two are phase voltages 180 degrees-lagged, and a third load with twice the amplitude of the phase voltage, (ii) has the output voltages with constant frequency and amplitude even under unbalanced loads, and (iii) has sinusoidal grid current and high-power factor even supplying nonlinear loads. In this way, the proposed system is suitable for uninterruptible power supply. Furthermore, the pulsewidth modulation (PWM) technique is proposed to generate the pole voltages of the converters, so that the output voltages have better power quality. The proposed converter is compared with a conventional 2L in terms of harmonic distortion. Simulated results are provided to verify the operation of the proposed system.

关键词： Voltage control DC-DC power converters Pulse width modulation Frequency conversion Legged locomotion Uninterruptible power systems

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DC-AC Multilevel T-type Isolated Three-Phase Indirect Matrix Inverter

DC-AC Multilevel T-type Isolated Three-Phase Indirect Matrix...

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European Conference on Power Electronics and Applications

作者： Ailton do E. Dutra Montiê A. Vitorino Maurício B. R. Corrêa Post-Graduate Program in Electrical Engineering (PPgEE-COPELE) FEDERAL UNIVERSITY OF CAMPINA GRANDE (UFCG) Campina Grande PB Brazil

In this work it is proposed a multilevel T-type configuration for a high-frequency pulsating DC-link inverter for three-phase applications. The configuration consists of two DC/DC-pulsating converters cascaded with a DC-link capacitor-less three-phase three-level T-type inverter. Due to the absence of DC-link electrolytic capacitors, the proposed inverter guarantees a long lifetime and high power density. The DC-DC-pulsating converters aim to generate the high-frequency pulsating DC-link waveform profiles which have to be synchronized with the three-phase inverter PWM. Comparing to the conventional PWM, the proposed technique presents reduced switching losses due to the fact only one leg commutes during a switching period while the other two legs keep clamped in high or low impedance. Details of control strategy and modulation are presented, such as experimental results to validate the theoretical approach.

关键词： Inverters Legged locomotion Europe Capacitors Pulse width modulation

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Three-Phase Integrated PFC AC-AC Resonant Inverter with Weak Coupled Coils for Induction Heating Application

Three-Phase Integrated PFC AC-AC Resonant Inverter with Weak...

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IEEE Energy Conversion Congress and Exposition

作者： Ruan C. M. Gomes Montie A. Vitorino Diego A. Acevedo-Bueno Mauricio B. R. Correa Post-Graduate Program in Electrical Engineering (PPgEE–COPELE) Federal University of Campina Grande (UFCG) Campina Grande PB Brazil

This paper proposes a 4.3 kW three-phase integrated PFC AC-AC resonant inverter for Induction Heating (IH) Application. This converter is composed by three independent resonant inverters with non-smoothed DC link that achieves high power factor operation. The magnetic coupling of the three coils was modeled by using the impedance matrix for characterizing the resonant behavior of the arrangement. The coils arrangement with weak coupling between coils is applied for induction water heater. Experimental results validate the modes of operation with ZVS and the converter performance in the entire power input range (PF and THD).

关键词： Coils DH-HEMTs Magnetic noise Magnetic resonance Magnetic shielding Couplings Impedance

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Four-Port AC/DC-DC/AC Dual Active Bridge Based Converter

Four-Port AC/DC-DC/AC Dual Active Bridge Based Converter

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European Conference on Power Electronics and Applications

作者： Diego A. Acevedo-Bueno José D. G. da Silva Jonatas R. Kinas Montiê A. Vitorino Antonio M. N. Lima Edison R. C. da Silva Alexandre C. Oliveira Post-Graduate Program in Electrical Engineering (PPgEE – COPELE) FEDERAL UNIVERSITY OF CAMPINA GRANDE (UFCG) Campina Grande PB Brazil

In this paper, a Four-Port AC/DC-DC/AC conversion system is proposed using two full-bridge converters and a high-frequency transformer following the principle of Dual Active Bridge Converter. Two full-bridge AC/DC single-phase converters are connected by coupling their boost inductance to create a high-frequency transformer of the resulting proposed converter. The isolated power transfer between converters is controlled by the duty cycles and the phase-shift applied to the primary and secondary of the split transformer. The boundaries of the switching modes and the power transferred through the high-frequency transformer were obtained analytically. The system feasibility was validated by simulations and by a 300 W prototype with 94.9% maximum efficiency.

关键词： Bridge circuits Inductance Europe Windings Magnetization Switches Boundary conditions

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AC-DC Power Conversion Systems for Open-End Winding PMSM Based on Vienna Rectifiers

AC-DC Power Conversion Systems for Open-End Winding PMSM Bas...

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IEEE Energy Conversion Congress and Exposition

作者： Amanda P. Monteiro Cursino B. Jacobina Filipe A. C. Bahia Reuben P. R. Sousa Post-Graduate Program in Electrical Engineering PPgEE/COPELE Paraíba Brazil Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Paraíba Brazil

This paper proposes three unidirectional ac-dc conversion power systems for wind energy conversion system (WECS) applications. These topologies are based on Vienna rectifiers and have reduced number of controlled switches, which allows reduce size, costs and is still possible to obtain low current harmonic distortion. They are composed of a series connection of two three-phase converters associated to a permanent magnet synchronous machine (PMSM) by an open-end winding (OEW) configuration. Compared with the three-phase rectifier with reduced number of controlled switches, proposed topologies offer a higher levels-per-switch ratio, allowing to achieve a sinusoidal converter current with same or lower harmonic content. Besides this, they can offer lower switch blocking voltage. These characteristics make them very interesting options to the manufacturers due to reduced costs and better power quality offered. The system model, PWM technique and control strategy are discussed. Simulation and experimental results are provided in order to validate their performance and feasibility.

关键词： Wind energy conversion system Vienna rectifiers unidirectional rectifiers

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Cascaded Three-Phase H-Bridge Converter Applied as Series Active Compensator for DFIG-Based Wind Energy Conversion Systems

Cascaded Three-Phase H-Bridge Converter Applied as Series Ac...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Ítalo A. Cavalcanti de Oliveira Cursino Brandão Jacobina Emerson de Lacerda Soares Nady Rocha Post-Graduate Program in Electrical Engineering (PPgEE) Federal University of Campina Grande (UFCG) Campina Grande Paraíba Brazil Federal University of Campina Grande (UFCG) Campina Grande Brazil Federal University of Paraíba (UFPB) João Pessoa Paraíba Brazil

ISBN: (数字)9781728158266

ISBN: (纸本)9781728158273

This paper presents the use of an active series compensator to improve the performance of wind energy conversion systems (WECS) using a grid-connected doubly-fed induction generator (DFIG) during grid disturbances. The series active compensator is based on a two-level three-phase inverter cascaded with three H-bridge inverters operating with floating capacitors and without using injection transformer. The converter operating principles and control strategies are discussed. Steady-state simulations were obtained for the DFIG with constant torque. Experimental results are also presented. It was verified that the proposed system is able to maintain sinusoidal and compensated voltages on the DFIG stator windings, even during a distorted grid voltage sag event.

关键词： Stator windings Doubly fed induction generators Capacitors Voltage control Rotors Reactive power

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Single-Phase Six-Switch Universal Active Power Filter 10

Single-Phase Six-Switch Universal Active Power Filter

引用

10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018

作者： Rodrigues, Phelipe L.S. Jacobina, Cursino B. Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Brazil Campina Grande Paraíba58429-900 Brazil

ISBN: (纸本)9781479973118

In this paper, three structures were developed and analyzed, these configurations are based on three-leg ac/dc/ac converters operating as a universal active power filter (UAPF) also known as unified power quality conditioner (UPQC). The proposed configurations are appropriate for a voltage sag/swell compensation, reactive power compensation, reducing losses and switches, as well as for applications where the input voltage is twice the output voltage, for example, applications in systems in Brazil where the voltages vary between 220 V (rms) and 110 V (rms) from one state to another. The proposed six-switch single-phase UAPF are compared with the conventional three-leg and four-leg single-phase UAPF solutions. The pulsewidth modulation (PWM) and control techniques are developed and presented. For validation purposes, the simulation and experimental results for proposed configurations are shown. © 2018 IEEE.

关键词： Pulse width modulation

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Comparison of Potential Telemarketing Customers Predictions with a Data Mining Approach using the MLPNN and RBFNN Methods

Comparison of Potential Telemarketing Customers Predictions ...

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International Conference on Information and Communications Technology (ICOIACT)

作者： Annisa Nurul Puteri Dewiani Zulkifli Tahir Post-graduate Program of Electrical Engineering Hasanuddin University Makassar Indonesia Dept. Electrical Engineering Hasanuddin University Makassar Indonesia Dept. Informatics Engineering Hasanuddin University Makassar Indonesia

Bank as a company that has many customers who conduct transactions every day, of course, has data that is increased continuously. In this paper, customer transaction data has been predicted to find potential customers in deposit offer. Data mining approach has been performed to classify potential customers for marketing through telemarketing. This data analysis can be used as a consideration in determining marketing strategy decisions for marketing managers. 15,713 data with 13 class attributes and 1 target class were obtained from UCI Machine Learning repository. The data was divided into 70% training data and 30% test data. Feedforward method of Artificial Neural Network was used to classify customer data. Multilayer Perceptron Neural Network and Radial Basis Function Neural Network were used to obtain optimal classification results. The result of this classification predicted potential customers to subscribe deposits. The result of this study indicated that the Radial Basis Function Neural Network method with 95.3% accuracy and 96.4% sensitivity was a better method compared to the Multilayer Perceptron Neural Network method with 88.0% accuracy and 99.4% sensitivity.

关键词： Artificial neural networks Data mining Multilayer perceptrons Support vector machines Radial basis function networks Entropy

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Three-Leg Single-Phase Universal Active Power Filter 10

Three-Leg Single-Phase Universal Active Power Filter

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10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018

作者： Rodrigues, Phelipe L. S. Jacobina, Cursino B. PPgEE COPELE Post-Graduate Program in Electrical Engineering Brazil Campina Grande Paraíba58429-900 Brazil

ISBN: (纸本)9781479973118

This paper presents a topology based on three-leg ac-dc-ac converters for active power filter (APF) applications. The proposed configuration is appropriate for voltage sag/swell compensation, reactive power compensation, and for reducing losses and the number of switches. The proposed three-leg single-phase universal active power filter (UAPF) is compared with conventional four-leg and three-leg single-phase UAPF solutions. Pulsewidth modulation (PWM) and control techniques are developed and presented. For validation purposes, simulation and experimental results of proposed configurations are shown. © 2018 IEEE.

关键词： Pulse width modulation

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