TY - GEN
T1 - Cascaded H-bridge multilevel converter multistring topology for large scale photovoltaic systems
AU - Rivera, S.
AU - Kouro, S.
AU - Wu, B.
AU - Leon, Jose I.
AU - Rodriguez, Jose
AU - Franquelo, Leopoldo G.
PY - 2011
Y1 - 2011
N2 - 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 this paper. Simulation results of a 7-level CHB for a multistring PV system are presented to validate the proposed topology and control method.
AB - 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 this paper. Simulation results of a 7-level CHB for a multistring PV system are presented to validate the proposed topology and control method.
KW - DC power transmission
KW - Electric converters
KW - Energy conversion
KW - Industrial electronics
KW - photovoltaic effects
KW - Topology
UR - http://www.scopus.com/inward/record.url?scp=80052843071&partnerID=8YFLogxK
U2 - 10.1109/ISIE.2011.5984437
DO - 10.1109/ISIE.2011.5984437
M3 - Conference contribution
AN - SCOPUS:80052843071
SN - 9781424493128
T3 - Proceedings - ISIE 2011: 2011 IEEE International Symposium on Industrial Electronics
SP - 1837
EP - 1844
BT - Proceedings - ISIE 2011
T2 - 2011 IEEE International Symposium on Industrial Electronics, ISIE 2011
Y2 - 27 June 2011 through 30 June 2011
ER -
