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JPE, Vol. 17, No. 5, September 2017
A Dynamic Power Distribution Strategy for Large-scale Cascaded Photovoltaic Systems
Kangan Wang, Xiaojie Wu, Fujin Deng, and Feng Liu
Area Renewable Energy
Abstract The cascaded H-bridge (CHB) multilevel converter is a promising topology for large-scale photovoltaic (PV) systems. The output voltage over-modulation derived by the inter-module active power imbalance is one of the key issues for CHB PV systems. This paper proposed a dynamic power distribution strategy to eliminate the over-modulation in a CHB PV system by suitably redistributing the reactive power among the inverter modules of the CHB PV system. The proposed strategy can effectively extend the operating region of the CHB PV system with a simple control algorithm and easy implementation. Simulation and experimental results carried out on a seven-level CHB grid-connected PV system are shown to validate the proposed strategy.
Keyword Cascaded H-bridge (CHB),Extended operating region,Grid-connected PV system,Power distribution,Power imbalance
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