A Novel Grid-Connected PV System Based on MMC to Get the Maximum Power Under Partial Shading Conditions

In the case of partial shading, the output power of the unshaded PV modules will be decreased by the influence of the shaded PV modules in one branch. In order to solve this problem, this paper proposes a novel topology for a PV power generation system by connecting a PV module to the capacitor in e...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2017-06, Vol.32 (6), p.4320-4333
Main Authors: Rong, Fei, Gong, Xichang, Huang, Shoudao
Format: Article
Language:English
Subjects:
Capacitors
Control stability
Converters
Electric potential
Electric power generation
Grid-connected
Integrated circuits
Maximum power tracking
MMC
Modules
partial shading
photovoltaic (PV) power generation system
Photovoltaic cells
Power generation
Power system stability
Redundancy
redundancy control
Shading
Switches
Topology
Tracking control
Voltage control
Voltage stability
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Summary:In the case of partial shading, the output power of the unshaded PV modules will be decreased by the influence of the shaded PV modules in one branch. In order to solve this problem, this paper proposes a novel topology for a PV power generation system by connecting a PV module to the capacitor in each submodule of a modular multilevel converter parallel. As partial shading occurs, the maximum power can be extracted by regulating the capacitor voltage to the maximum power point voltage. With this proposed topology, the maximum power tracking controller, the redundancy module controller, the voltage stability controller, and the grid-connected controller are studied. Simulation and experiment results show that comparing to the traditional topology, the proposed topology can greatly improve the output power of the PV system under the conditions of partial shading and features with low-voltage stress and high efficiency.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2016.2594078