Livros ou Capítulos de Livros Publicados ELETRÕNICA DE POTÊNCIA GEPOC UFSM

Electric Machines and Drives

Autor(es): Hilton Abílio Gründling, Cristiane Cauduro Gastaldine, Rodrigo Zelir Azzolin, Rodrigo Padilha Vieira, et al.

Editora: InTech

Ano: 2011

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Robust Control, Theory and Applications

Autor(es): Hilton Abílio Gründling, João Marcos Kanieski, Rafael Cardoso, et al.

Editora: InTech

Ano: 2011

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Kalman Filter: Recent Advances and Applications

Autor(es): Hilton Abílio Gründling, Rafael Cardoso, et al.

Editora: InTech

Ano: 2009

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Acionamentos Elétricos

Autor(es): Claiton Moro Franchi

Editora: Érica

Ano: 2009

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Controladores Lógicos Programáveis - Sistemas Discretos

Autor(es): Claiton Moro Franchi e Valter Luís Arlindo de Camargo

Editora: Érica

Ano: 2009

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WEBSITE ORIGINAL

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Performance Improvement of PWM Converter-Inverter System for AC Supplied Electric Train HYUNGCHUL KIM DEPARTAMENT OF ELECTRICAL ENGINEERING CHUNGBUK NATIONAL UNIVERSITY

ABSTRACT

Domestically in 1994, both Gwacheon and Bundang line used the GTO converter/inverter system instead of the resistance control system, which started active research on AC supplied vehicle.[3] Addition to this, introduction of high-speed railway vehicles such as KTX and tilting train has developed interest about PWM converter-inverter system and its control method.[9] PWM converter which converts AC power into DC power has been used to maintain the sinusoidal current waveform and unity power factor in AC side. This means that the AC current controller of PWM converter has to produce very low AC current tracking error and no phase delay even though the load changes abruptly.[10-17] The PWM converter system with feedback controller is generally constructed with double feedback loop, which consists of an inner AC current-feedback loop and an outer DC voltage-feedback loop.[7][22] These feedback loops are usually designed with PI controller, but the close interconnection between the loops complicates the frequency analysis to the design controller. When a digital controller is used, the control performance is limited to a certain value due to the low sampling rate. Therefore, the system characteristics depend on various situation, and the gain tuning of each PI controller has been basing on trial and error method conventionally considering switching frequency, sampling frequency, parameter variation, and etc. This research proposes a robust digital current controller for a single phase AC/DC PWM converter in electric train under two main considerations. One is that overall system keeps very low AC current tracking error without any phase delay over the different load conditions, and the other is that the digital controller is designed at a fixed sampling rate.

Power Electronic Transformers for AC-AC and AC-DC Conversion with Reduced Number of Switches. Castelino, Gysler Fatima FACULTY OF THE GRADUATE SCHOOL OF THE UNIVERSITY OF MINNESOTA

Power Electronic Transformers for AC-AC and AC-DC Conversion with Reduced Number of Switches.

A DISSERTATION
SUBMITTED TO THE FACULTY OF THE GRADUATE SCHOOL
OF THE UNIVERSITY OF MINNESOTA
BY
Gysler Fatima Castelino
IN PARTIAL FULFILLMENT OF THE REQUIREMENTS
FOR THE DEGREE OF
Doctor of Philosophy

LINK
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Study on voltage sensorless maximum power point tracking method using photovoltaic AC module flyback inverter KIM YOUNG HO - SCHOOL GRADUATE SUNGKYUNKWAN UNIVERSITY

ABSTRACT
Study on voltage sensorless maximum power point tracking method using photovoltaic AC module flyback inverter In recent years, interest in natural energy has grown in response to increased concern for the environment. Many kinds of inverter circuits and their control schemes for photovoltaic power generation systems have been studied. A conventional system employs a PV array in which many PV modules are connected in series to obtain sufficient dc input voltage for generating ac utility line voltage from an inverter circuit. However, the total power generated from the PV array is sometimes decreased when only a few modules are partially covered by shadows, thereby decreasing inherent current generation, and preventing the generation current from attaining its maximum value on the array [26]. To overcome this defect, a low-power ac utility interactive inverter is mounted on each individual PV module and the inverter operates so as to generate the maximum power from the corresponding PV module. In these ac module systems, each output terminal of the individual inverter is connected to the utility line, and the generation on current of each inverter is injected into the utility line. So, these systems lied in the number of the parallel connected inverters, which is equal to the number of PV modules, can be selected in consideration of the dimensions of the roof on which PV modules are installed. This improves the flexibility of the PV generation system. [27]. In these ac module systems, the MPPT is used to ensure optimal utilization of solar cells. The implementation essentially involves sensing input current and voltage. An MPPT algorithm uses this information to maximize power drawn from the solar cells. Various MPPT control methods have been discussed in detail in [28]. The conventional MPPT would usually require at least a couple of current and voltage sensors and a relatively complex control strategy. With a view to minimize the overall cost and control complexity, this paper presents a novel MPPT scheme with reduced number of sensors [29]. The proposed system is operated with P&O MPPT using current sensor and calculated quantity of electric charge. In this paper, the theoretical explanation and the detailed operational principles are explained, along with informative simulation and experimental results.

LED Lighting Power Implementation Using AC Chopper Technology by Shin jae-min Department of Electronics & Mechatronics Engineering Graduate School of Industrial Technology & Management Korea Polytechnic University

Abstract
 LED Lighting Power Implementation Using AC Chopper Technology by Shin jae-min
 Advisor : Prof. Choi sung-yun, Ph.D.
Department of Electronics & Mechatronics Engineering Graduate School of Industrial Technology & Management Korea Polytechnic University
 The key point of this paper writing is that the life span of an power supply unit for using the recent DC LED illumination is often mentioned, even though it is the trend that incandescent lamp, fluorescent lamps and illumination for industry are replaced by the low power LED illuminations as a part of alternative activity due to the recent energy exhaustions. The applying of AC LED to drive AC directly without converting AC to DC to overcome the life span of electrolysis condenser for a rectification to be related to the life span of DC LED illumination. Utilize a merit of high efficiency and semipermanent of LED can be substantialized the power supply device which can preserve the life span, not using an electrolysis condenser for a rectification. With this development, using AC Chopper technology can be substantialized the power supply unit for the stable AC LED illumination, and system composition can improve power factors and THD through the controls that used MICOM and it can contribute to commercialize LED illumination with the long life and high efficiency.