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A Single-Phase Photovoltaic Inverter Topology With a Series-Connected Energy Buffer

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2 Author(s)
Pierquet, B.J. ; Dept. of Electr. Eng., Univ. of Washington, Seattle, WA, USA ; Perreault, D.J.

Module integrated converters (MICs) have been under rapid development for single-phase grid-tied photovoltaic applications. The capacitive energy storage implementation for the double-line-frequency power variation represents a differentiating factor among existing designs. This paper introduces a new topology that places the energy storage block in a series-connected path with the line interface block. This design provides independent control over the capacitor voltage, soft-switching for all semiconductor devices, and the full four-quadrant operation with the grid. The proposed approach is analyzed and experimentally demonstrated.

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Power Electronics, IEEE Transactions on  (Volume:28 ,  Issue: 10 )