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Design and Control of Three-Phase PV Grid Connected Converter with LCL Filter

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5 Author(s)
Fei Liu ; Huazhong Univ. of Sci. & Technol., Wuhan ; Shanxu Duan ; Pengwei Xu ; Guoqiang Chen
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Voltage source converters (VSC) are widely used in the distribution generation (DG) systems for the conversion of renewable energies. These converters are usually connected to the utility grid through a simple L filter to reduce the current harmonics injected to the grid. A LCL network, which can achieve reduced levels of harmonic distortion at low switching frequencies with less inductance, is a good alternative. In this paper, a three-phase converter with LCL filter is theoretically analyzed, and the corresponding state-space mathematic model is established. Furthermore, a hybrid controller incorporating repetitive control and state feedback pole-assignment control is proposed for the converter. Simulation and experimental results of the converter with LCL filter are provided to verify the validity of the proposed controller.

Published in:

Industrial Electronics Society, 2007. IECON 2007. 33rd Annual Conference of the IEEE

Date of Conference:

5-8 Nov. 2007