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The p-q theory for active filter control: some problems and solutions
Watanabe,Edson H.; Aredes,Maurício; Akagi,HirofumiThe 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...
Variable speed synchronous condenser using doubly-fed induction machine
Ferreira,Antonio Carlos; Souza,Luciano Moraes de; Watanabe,Edson H.The wound rotor induction machine (WRIM) presents characteristics that make it attractive as an energy storage system where the energy is stored as kinetic energy in the rotor moving parts. When operating in the doubly fed mode (DFIM), with the rotor fed by a variable frequency power converter, the WRIM behaves as a synchronous machine, differing from the latter in the variable speed operation and larger dumpin...
Filtro ativo paralelo com controle digital de baixo custo
Afonso, João L.; Martins, Júlio S.; Aredes, Maurício; Watanabe, EdsonEste 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...
Shunt active filter for power quality improvement
Afonso, João L.; Aredes, Maurício; Watanabe, Edson; Martins, Júlio S.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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