Modular multilevel converter for large-scale multistring photovoltaic energy conversion system

Conference paper (2013)

Authors

Sebastian Rivera Toronto Metropolitan University
Bin Wu Toronto Metropolitan University
Ricardo Lizana Universidad Técnica Federico Santa María
Samir Kouro Universidad Técnica Federico Santa María
Marcelo Perez Universidad Técnica Federico Santa María
Jose Rodriguez Universidad Técnica Federico Santa María
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Published Date

2013

Language

English

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Abstract

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.