This paper presents a new grid connected photovoltaic energy conversion system configuration for large scale power plants. The grid-tied converter is based on a modular multilevel converter using voltage source H-bridge cells. The proposed converter is capable of concentrating a multimegawatt PV plant with distributed string MPPT tracking capability, high power quality and increased efficiency compared to the classic two-level voltage source converters. The main challenge is to handle the inherent power unbalances which may occur, not only between the different cells of one phase of the converter, but also between the three phases. The control strategy to deal with these unbalances is analyzed in this paper. Simulation results for a downsized 7 level MMC composed of 18 H-bridge cells and PV strings are presented to validate the proposed topology and control method.
|Nombre||2013 IEEE Energy Conversion Congress and Exposition, ECCE 2013|
|Conferencia||5th Annual IEEE Energy Conversion Congress and Exhibition, ECCE 2013|
|Período||15/09/13 → 19/09/13|
Publisher Copyright: © 2013 IEEE.