Passive filters, commonly used to attenuate non-characteristic harmonics in High Voltage Direct Current (HVDC) systems, stay at risk of disconnection from the system due to overcurrent problems. A possible solution to solve the problems involving high harmonic levels would be the use of pure active filters. However, this alternative is unpractical due to the high power of the transmission systems. This paper pr...
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...
Neste 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...
Comunicação apresentada no 8th COBEP - Congresso Brasileiro de Eletrônica de Potência, Recife, PE, Brasil, 14-17 Julho 2005. ; In this work a control strategy for a three-level Unified Power Quality Conditioner (UPQC) is introduced. Basically, this control strategy is based on the set of active and non-active (reactive) power definitions in the time domain, which have been proposed by Fryze in the 30´s of the ...
The instantaneous active and reactive power theory or the p-q Theory is widely used to design controllers for active filters. This paper deals with some problems due to the misinterpretations of this theory. A historical background of the theory is presented and the problem caused by distorted voltages at the point of common connection (PCC) is analyzed. In addition, the appearance of source current harmonic co...
Este artigo descreve o desenvolvimento de um filtro ativo paralelo de baixo custo utilizado para a melhoria da qualidade de energia elétrica. O filtro permite a correção dinâmica do fator de potência e a compensação dinâmica dos harmônicos e da componente de sequência zero de corrente. O sistema de controle do filtro ativo é baseado na teoria p-q (teoria da potência instantânea), e foi implementado com um micro...
This paper describes the development of a low cost shunt active power filter with digital control, which allows dynamic power factor correction and both harmonics and zero-sequence current compensation. The active filter controller is based on the instantaneous power theory (p-q theory) and was implemented using a standard 16 bits microcontroller. The p-q theory is introduced followed by the presentation of som...
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