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A Estimação da Probabilidade de uma Falência - Uma aplicação empírica em PME's ...

Finanças ; Master in Finance

Field results on developed three-phase four-wire shunt active power filters

Abstract-This paper presents three-phase four-wire Shunt Active Power Filters with ability to compensate current harmonics, power factor, and current unbalance. The power stage of the Active Power Filters is based on a two-level four-leg inverter. The switching technique is based on an optimized periodic sampling strategy, and the digital controller uses the Theory of Instantaneous Reactive Power (p-q Theory) e...

Single-phase shunt active filter interfacing renewable energy sources with the ...

This paper presents a single-phase Shunt Active Filter combined with a Maximum Power Point Tracker (MPPT) connected to a solar panel array. The Shunt Active Filter’s power stage consists of a two-leg IGBT inverter commanded by a Digital Signal Processor (DSP) with control based on the Theory of Instantaneous Reactive Power (p-q Theory). The MPPT is based on a step-up circuit commanded by a DSP with MPPT Algorit...

Comparison of three control theories for single-phase active power filters

Active Power Filters have been developed in last years, mostly for three-phase systems applications. The use of Shunt Active Power Filters on single-phase facilities brings many benefits for the electrical grid, since these installations have non linear loads and power factor problems, and in their total, they are responsible by a significant portion of the total electric energy consumption. Harmonics and react...

Development of an electrical power quality monitor based on a PC

This paper describes an Electric Power Quality Monitor developed at the University of Minho. The hardware of the Monitor is constituted by four current sensors based on Rogowski effect, four voltage sensors based on Hall effect, a signal conditioning board and a computer. The software of the Monitor consists of several applications, and it is based on LabVIEW. The developed applications allow the equipment to f...

Electric power quality monitoring results in different facilities

This paper presents results of electric power quality monitoring studies performed in different industries and in universities. The monitoring was made with an Electric Power Quality Monitor developed at the University of Minho. The studies were performed in different installations: textile industries, a pharmaceutical industry, a hospital and two universities. Therefore, the results showed in this paper were o...

Sistema de monitorização de energia eléctrica

Este artigo descreve o desenvolvimento de um Sistema de Monitorização de Energia Eléctrica de baixo custo baseado num PC (computador pessoal) [1, 2]. O equipamento é constituído por quatro sensores de corrente com bobinas de Rogowski, quatro sensores de tensão baseados no efeito Hall com controlo em malha fechada, uma placa de condicionamento e um PC. O software é baseado em LabView e apresenta várias aplicaçõe...

SINUS : tecnologia para monitorização da qualidade de energia, compensação dinâ...

Este artigo descreve o Projecto SINUS – Tecnologia para Compensação Dinâmica de Harmónicos, Factor de Potência e Desequilíbrios – DEMTEC/020/1/03. Este projecto trata do desenvolvimento de protótipos de equipamentos a serem demonstrados em funcionamento em 4 diferentes instalações (uma Indústria Têxtil, uma Indústria Farmacêutica, um Hospital e uma Universidade). Os equipamentos terão a função de monitorizar os...

Breve estudo sobre a etiologia e pathogenia dos retro-desvios uterinos e seu tr...