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96 results on '"Araujo-Vargas, Ismael"'

5. High performance rectification for future power networks

Author

Araujo-Vargas, Ismael

Subjects
621.31
Abstract

A technology move, known as the More Electric Aircraft, is resulting in the use of electric motor drives and power electronic converters to replace the hydraulic, pneumatic and mechanical power systems that are used onboard aircraft. The application of high performance multi-pulse rectifiers as the input stage of the power conversion circuits for actuators and motor drives is becoming typical in aircraft systems, and the growing use of rectifier-front-end equipment is resulting in more stringent power quality limits being placed on load current harmonics. This Thesis describes the development of an active injection technique for a 12-pulse rectifier that uses the natural harmonic ripple of the rectifier to produce high-quality input currents. The injection technique utilises a single low-rated active device that carries approximately 2.9% of the load current, and it potentially offers two important advantages over previously reported ripple injection techniques. First, there is no need to use an injection transformer, avoiding the associated weight penalty. Second, the active device may be driven with either low-frequency pulses or high-frequency, pulse-width modulation to produce 24/36-pulse operation or multi› level PWM operation respectively. The resultant input currents are almost sinusoidal, the line current THD being 2.36%for the 24-pulse operation and 1.06%for the PWM operation. The active injection technique uses a phase-locked loop control strategy that synchronises the injector operation with the harmonic ripple frequency of the rectifier. The circuit operation, idealised waveforms, modulation strategy and design are explained together with Micro-Cap simulation and experimental results, which are presented from a 4 kW prototype to illustrate and examine the circuit performance in both 24/36-pulse and PWM operating modes.

Published
2007

10. Power Losses Models for Magnetic Cores: A Review

Author

Rodriguez-Sotelo, Daniela, primary, Rodriguez-Licea, Martin A., additional, Araujo-Vargas, Ismael, additional, Prado-Olivarez, Juan, additional, Barranco-Gutiérrez, Alejandro-Israel, additional, and Perez-Pinal, Francisco J., additional

Published
2022
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13. 36-pulse hybrid ripple injection for high-performance aerospace rectifiers

Author

Chivite-Zabalza, F. Javier, Forsyth, Andrew J., and Araujo-Vargas, Ismael

Subjects
Electric current converters -- Design and construction, Electric current rectifiers -- Design and construction, Electric current rectifiers -- Analysis, Electric current rectifiers -- Electric properties, Rectifier instruments -- Design and construction, Rectifier instruments -- Analysis, Rectifier instruments -- Electric properties, Electric current converter, Business, Computers, Electronics, Electronics and electrical industries
Abstract

This paper presents a three-phase voltage-source 36-pulse converter that draws almost sinusoidal currents. The converter results from the combination of a series-connected 12-pulse voltage-source rectifier with a passive voltage-injection circuit and a bidirectional switch, referred to as hybrid injection. The voltage-injection circuit uses a single-phase rectifier bridge and a single-phase transformer. Both the voltage-injection circuit and the bidirectional switch operate at six times the supply frequency and have a low rating. In this paper, the converter operation is explained and analyzed. Subsequently, the converter is evaluated experimentally using a 4-kW 400-Hz prototype, where the [THD.sub.I] of the line currents was measured to be below 1.2%. Index Terms--AC-DC power conversion, aircraft power systems, power quality, rectifiers.

Published
2009

14. High-performance multipulse rectifier with single-transistor active injection

Author

Araujo-Vargas, Ismael, Forsyth, Andrew J., and Chivite-Zabalza, F. Javier

Subjects
Electric current rectifiers -- Design and construction, Rectifier instruments -- Design and construction, Metal oxide semiconductor field effect transistors -- Design and construction, Pulse-duration modulation -- Methods, Waveforms -- Evaluation, Power electronics -- Research, Business, Electronics, Electronics and electrical industries
Abstract

A three-phase, multilevel rectifier using active voltage injection with one MOSFET device is presented. The injector consists of a bidirectional switch that modifies the behavior of a 12-pulse rectifier resulting in either 24-pulse or multilevel pulsewidth-modulated (PWM) operation. The resultant input currents are almost sinusoidal, the line current THD being 2.36% for 24-pulse operation and 1.06% for PWM operation. The MOSFET current is 2.9% of the load current. The circuit operation, idealized waveforms and modulation strategy are explained and experimental results are presented. Index Terms--High-power factor rectification, three-phase multipulse rectifier.

Published
2008

22. AC-DC Converter for Plug-in Electric Vehicles Charger

Author

Villagran-Valencia, Luis-Javier, primary, Mondragon-Escamilla, Nancy, additional, Ramirez-Hernandez, Jazmin, additional, Araujo-Vargas, Ismael, additional, Velazquez-Elizondo, Pedro-Enrique, additional, and Vasquez-Castillo, Ozni-Manuel, additional

Published
2018
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34. AC distribution grid proposal to improve the power quality of the Line-B Metro System of Mexico City

Author

Bautista-Arias Jose Luis, Mejia-Cuevas E. Ivan, Solis-Morales Patricia, Valencia-Figueroa Fermin, Ponce-Flores Mario, and Araujo-Vargas Ismael

Subjects
Engineering, business.industry, Electrical engineering, Power factor, Grid, law.invention, law, Harmonics, Electronic engineering, Power quality, Power engineering, Transformer, business, Harmonic distribution, Voltage
Abstract

A power quality diagnosis campaign was done for the Line B of the Mexico City underground system to understand and improve its behaviour. A comparative analysis of the results obtained during the campaign is presented describing a method to improve the power quality. The AC distribution of this underground system consists of a set of transformers and multipulse rectifiers; however, the harmonic content is highly dominant by the 6k±1 harmonic order and the harmonic distribution is poorly mitigated by the load-balanced arrangement. The field measurement work, the practical issues at the power quality campaign and a proposal to improve the harmonic performance are explained together with the field and estimated results obtained with measurements realized to the AC medium voltage grid of the Mexico City Line B. (6 pages)

Published
2012

45. Experimental B-learning laboratory for an electrical machines undergraduate course.

Author

Perez Pinal, Francisco, Nava, Saul, Nunez Perez, Jose, Araujo Vargas, Ismael, Vera Cardenas, Edgar, and Barranco Gutierrez, Alejandro

Abstract

This paper presents the development of an experimental B-learning laboratory for an electrical machines undergraduate course. A custom conditioning signal board was developed from scratch that fits a low-cost data acquisition board used to interact with the LabVIEW real time target. In addition a friendly graphical user interface was developed that allows real time remote user interaction. The system was developed and fully tested in a standard Lucas-Nulle 300W electrical machines module. It is shown that the resulting system can be extended to other modules already in the market, and the conditioning signal board adapted to other electrical engineering courses. [ABSTRACT FROM PUBLISHER]

Published
2016
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