A control strategy for a three-phase four-wire shunt active filter

• Autor(es): Ferreira, Filipe ; Monteiro, Luís F. C. ; Afonso, João L. ; Couto, Carlos
• Data: 2008
• Identificador Persistente: http://hdl.handle.net/1822/13469
• Origem: RepositóriUM - Universidade do Minho
• Assunto(s): Power quality; Shunt active filter; Real-time control system; Dc-link voltage regulation
• Tipo de Documento: Documento de conferência
• Idioma: Inglês

Descrição

This paper presents a control strategy for a three- phase four-wire shunt active filter. The shunt active filter is a custom-power device capable to compensate, in real time, harmonics, unbalances and power factor in an electrical installation. In this work the power circuit is based on a three-leg IGBT inverter, with the dc-link composed by two capacitors connected in split. Thus the neutral point is connected directly to the midpoint of the dc-link capacitors. Its control system is composed by an algorithm based on the active and non-active currents together with a synchronizing circuit, and a novel algorithm to keep the voltages of the dc-link capacitors balanced and regulated. Due to the applied power-inverter topology, it is imperative to keep these voltages of the dc-link capacitors balanced in order to avoid malfunctioning of the active filter. To validate the proposed control strategy, simulation and experimental results are presented.