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Single-phase shunt active filter with digital control
Pinto, J. G.; Neves, Pedro; Pregitzer, Ricardo G.; Monteiro, Luís F. C.; Afonso, João L.This paper presents a single-phase shunt active filter designed to minimize problems related to power quality in electrical systems. The power stage of the active filter is based on a two-leg full-bridge inverter, with a single capacitor in the dc side, and a filter inductor in the ac side. The control system is based on the instantaneous power theory in the α-β-0 reference frame (pq-theory), derived to be appl...
3-phase 4-wire shunt active power filter with renewable energy interface
Pinto, J. G.; Pregitzer, Ricardo G.; Monteiro, Luís F. C.; Afonso, João L.This paper presents a three-phase four-wire Shunt Active Filter that compensates power quality problems and can also interface renewable energy sources with the electric grid. The inverter stage of the active filter is based in a two level four leg inverter and its control is based in the Theory of Instantaneous Reactive Power (p q Theory). The filter is capable of compensating power factor, unbalance, and curr...
Developed power quality monitor used for shunt active power filter studies
Pinto, J. G.; Pregitzer, Ricardo G.; Monteiro, Luís F. C.; Batista, José; Afonso, João L.This paper presents a developed Power Quality Monitor used to perform studies in a prototype of a three-phase four wire Shunt Active Power Filter. In the developed equipment, the voltage measurements are made through Hall-effect sensors and for the current measurements flexible Rogowski Coil sensors are used. A conditioning circuit is used to interface the data from the sensors to a standard data acquisition bo...
A combined series active filter and passive filters for harmonics, unbalances a...
Pinto, J. G.; Pregitzer, Ricardo G.; Monteiro, Luís F. C.; Couto, Carlos; Afonso, João L.This paper describes a combined operation involving a series active filter and shunt passive filters for three-phase three-wire systems. The series active filter is able to minimize Power Quality problems like unbalances, harmonics and flicker observed at the system voltages. Another task for the series active filter is to damp possible resonances involving the passive filters and the system impedance. The shun...
Custom power interfaces for renewable energy sources
Rolim, L. G. B.; Ortiz, A.; Aredes, Maurício; Pregitzer, Ricardo G.; Pinto, J. G.; Afonso, João L.Interface converters for renewable energy sources can be regarded as custom power devices. Thus they can be designed and operated so as to improve power quality at their connecting locations. This paper presents examples of converter designs based on p-q theory for different applications. Modeling, simulations and experimental results are given for converter prototypes operating either as active power filter (A...
Parallel association of shunt active power filters
Pregitzer, Ricardo G.; Pinto, J. G.; Sepúlveda, João; Afonso, João L.This paper describes different types of parallel association of Shunt Active Power Filters, presents computer simulation models developed in PSCAD/EMTDC, and shows simulated results for each case. The control system used in the active filters is based on the Instantaneous Reactive Power Theory (p-q Theory). The active filters use periodic sampling as switching technique. Two types of parallel associations are p...
Experimental results of a single-phase shunt active filter prototype with diffe...
Neves, Pedro; Pinto, J. G.; Pregitzer, Ricardo G.; Monteiro, Luís F. C.; Afonso, João L.; Sepúlveda, JoãoThis paper presents experimental results obtained with a developed single-phase shunt active power filter laboratory prototype operating with different switching techniques. This active filter can compensate harmonic currents and power factor in single-phase electric installations. Its power circuit is based on a two-leg IGBT inverter, with a single capacitor in the dc side, and an inductor in the ac side. Its ...
Shunt active power filter with dynamic output current limitation
Pregitzer, Ricardo G.; Pinto, J. G.; Monteiro, Luís F. C.; Afonso, João L.This paper presents a shunt active filter with a controller able to dynamically limit the output current, which allows an effective protection of the inverter semiconductors without diminishing the active filter performance. The control strategy is based on the p-q theory expanded for three-phase four-wire systems and the power stage of the active filter is composed by a two-level four-leg inverter. Simulation ...
SINUS : tecnologia para monitorização da qualidade de energia, compensação dinâ...
Afonso, João L.; Pregitzer, Ricardo G.; Pinto, J. G.; Monteiro, Luís F. C.; Neves, Pedro; Alves, Renato; Gonçalves, Domingos; Cunha, José; Batista, JoséEste 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...
Condicionador unificado para a compensação simultânea de problemas de tensão e ...
Monteiro, Luís F. C.; Pregitzer, Ricardo G.; Pinto, J. G.; Afonso, João L.; Aredes, MaurícioNeste trabalho é feita uma análise do condicionador unificado denominado como UPQC (Unified Power Quality Conditioner). Este equipamento tem como objectivo melhorar a qualidade da energia do sistema de potência, minimizando simultaneamente os problemas observados nas tensões e nas correntes. Resultados de simulação obtidos com o programa de transitórios electromagnéticos PSCAD®/EMTDC™ são apresentados com o obj...
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