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      • Multiloop Control Strategy for Four-Wire Current Source Active Power Filter

        Sami Pettersson,Mika Salo,Heikki Tuusa 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-

        Despite the fact that three-wire active power filters have been implemented using both voltage source and current source technology, the research of four-wire current source active power filters has been truly minimal. Only a few topologies have been presented over the years. This paper proposes a four-wire current source active power filter topology for improving the quality of supply in four-wire systems. The proposed topology is controlled using a multiloop control strategy suitable for a single-chip microcontroller implementation. The control strategy combines the load current feedforward connection and the cascaded closed-loop control of the supply currents and the capacitor voltages of the LC-type supply filter. By using the cascaded closed-loop control, the stability of the system can be achieved without the need to overdimension the supply filter. The performance of the proposed system is verified experimentally using a microcontroller controlled four-wire current source active power filter prototype rated for a 5 ㎸A load.

      • Weight Minimization of LCL Filters for High Power Converters

        Ki-Bum Park,Frederick Kieferndorf,Uwe Drofenik,Sami Pettersson,Francisco Canales 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6

        Weight reduction of the LCL filter is one of the main concerns for high power, grid connected, voltage source converters (VSC) where an LCL filter can weigh hundreds of kilograms. It is a multi-domain optimization issue to find the minimum weight of an LCL filter considering PWM, control, filter design, and magnetic components with given constraints such as harmonic standards, semiconductor power loss, and cooling condition. The comprehensive design procedure and limits of an LCL filter for a 1.2-MVA VSC is provided in this paper.

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