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Cascaded H-bridge multilevel converter multistring topology for large scale photovoltaic systems

Opened Access Cascaded H-bridge multilevel converter multistring topology for large scale photovoltaic systems
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Autor: Rivera, S.
Kouro, Samir
Wu, B.
León Galván, José Ignacio
Rodríguez, José
García Franquelo, Leopoldo
Departamento: Universidad de Sevilla. Departamento de Ingeniería Electrónica
Fecha: 2011
Publicado en: IEEE International Symposium On Industrial Electronics (ISIE), 1837-1844. Gdansk, Polonia : IEEE
Tipo de documento: Ponencia
Resumen: Large scale grid connected photovoltaic (PV) energy conversion systems have reached the megawatt level. This imposes new challenges on existing grid interface converter topologies and opens new opportunities to be explored. In this paper a new medium voltage multilevel-multistring configuration is introduced based on a three-phase cascaded H-bridge (CHB) converter and multiple string dc-dc converters. The proposed configuration enables a large increase of the total capacity of the PV system, while improving power quality and efficiency. The converter structure is very flexible and modular since it decouples the grid converter from the PV string converter, which allows to accomplish independent control goals. The main challenge of the proposed configuration is to handle the inherent power imbalances that 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 imbalances is also introduced in thi...
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Tamaño: 1.283Mb
Formato: PDF

URI: http://hdl.handle.net/11441/23551

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