A Dynamic Power Distribution Strategy for Large-scale Cascaded Photovoltaic Systems

Kangan Wang; Xiaojie Wu; Fujin Deng; Feng Liu

A Dynamic Power Distribution Strategy for Large-scale Cascaded Photovoltaic Systems

Vol. 17, No. 5, pp. 1317-1326, Sep. 2017

10.6113/JPE.2019.17.5.1317

Cascaded H-bridge (CHB)

Extended operating region

Grid-connected PV system

Power distribution

Power imbalance

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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.

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Cite this article

[IEEE Style]

K. Wang, X. Wu, F. Deng, F. Liu, "A Dynamic Power Distribution Strategy for Large-scale Cascaded Photovoltaic Systems," Journal of Power Electronics, vol. 17, no. 5, pp. 1317-1326, 2017. DOI: 10.6113/JPE.2019.17.5.1317.

[ACM Style]

Kangan Wang, Xiaojie Wu, Fujin Deng, and Feng Liu. 2017. A Dynamic Power Distribution Strategy for Large-scale Cascaded Photovoltaic Systems. Journal of Power Electronics, 17, 5, (2017), 1317-1326. DOI: 10.6113/JPE.2019.17.5.1317.