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A new approach for the connection of a three-level inverter to the power grid for applications in solar energy conversion

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5 Author(s)
Alepuz, S. ; Mataro Sch. of Eng., Barcelona, Spain ; Gilabert, A. ; Arguelles, E. ; Bordonau, J.
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This paper studies the connection of a photovoltaic energy system to the AC mains by means of a 3-level voltage source inverter (VSI). A proposal for modeling and controlling the inverter is presented, in order to have full controllability of the power transfer and the DC-link voltage balance. The steady-state, the transient analysis and the large-signal operation are studied and the control is implemented combining a linear quadratic regulator (LQR) and gain-scheduling technique. The method is verified using large signal, nonlinear discrete and averaged simulation models.

Published in:

IECON 02 [Industrial Electronics Society, IEEE 2002 28th Annual Conference of the]  (Volume:4 )

Date of Conference:

5-8 Nov. 2002