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Title: Architectures and Control of Submodule Integrated DC-DC Converters for Photovoltaic Applications

Abstract

This paper describes photovoltaic (PV) module architectures with parallel-connected submodule-integrated dc-dc converters (subMICs) that improve efficiency of energy capture in the presence of partial shading or other mismatch conditions. The subMICs are bidirectional isolated dc-dc converters capable of injecting or subtracting currents to balance the module substring voltages. When no mismatches are present, the subMICs are simply shut down, resulting in zero insertion losses. It is shown that the objective of minimum subMIC power processing can be solved as a linear programming problem. A simple close-to-optimal distributed control approach is presented that allows autonomous subMIC control without the need for a central controller or any communication among the subMICs. Furthermore, the proposed control approach is well suited for an isolated-port architecture, which yields additional practical advantages including reduced subMIC power and voltage ratings. The architectures and the control approach are validated by simulations and experimental results using three bidirectional flyback subMICs attached to a standard 180-W, 72-cell PV module, yielding greater than 98% module-level power processing efficiency for a mismatch less than 25%.

Authors:
; ; ;
Publication Date:
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1211431
DOE Contract Number:  
DE-AR0000216
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Transactions on Power Electronics; Journal Volume: 28; Journal Issue: 6
Country of Publication:
United States
Language:
English

Citation Formats

Olalla, C, Clement, D, Rodriguez, M, and Maksimovic, D. Architectures and Control of Submodule Integrated DC-DC Converters for Photovoltaic Applications. United States: N. p., 2013. Web. doi:10.1109/TPEL.2012.2219073.
Olalla, C, Clement, D, Rodriguez, M, & Maksimovic, D. Architectures and Control of Submodule Integrated DC-DC Converters for Photovoltaic Applications. United States. doi:10.1109/TPEL.2012.2219073.
Olalla, C, Clement, D, Rodriguez, M, and Maksimovic, D. Sat . "Architectures and Control of Submodule Integrated DC-DC Converters for Photovoltaic Applications". United States. doi:10.1109/TPEL.2012.2219073.
@article{osti_1211431,
title = {Architectures and Control of Submodule Integrated DC-DC Converters for Photovoltaic Applications},
author = {Olalla, C and Clement, D and Rodriguez, M and Maksimovic, D},
abstractNote = {This paper describes photovoltaic (PV) module architectures with parallel-connected submodule-integrated dc-dc converters (subMICs) that improve efficiency of energy capture in the presence of partial shading or other mismatch conditions. The subMICs are bidirectional isolated dc-dc converters capable of injecting or subtracting currents to balance the module substring voltages. When no mismatches are present, the subMICs are simply shut down, resulting in zero insertion losses. It is shown that the objective of minimum subMIC power processing can be solved as a linear programming problem. A simple close-to-optimal distributed control approach is presented that allows autonomous subMIC control without the need for a central controller or any communication among the subMICs. Furthermore, the proposed control approach is well suited for an isolated-port architecture, which yields additional practical advantages including reduced subMIC power and voltage ratings. The architectures and the control approach are validated by simulations and experimental results using three bidirectional flyback subMICs attached to a standard 180-W, 72-cell PV module, yielding greater than 98% module-level power processing efficiency for a mismatch less than 25%.},
doi = {10.1109/TPEL.2012.2219073},
journal = {IEEE Transactions on Power Electronics},
number = 6,
volume = 28,
place = {United States},
year = {Sat Jun 01 00:00:00 EDT 2013},
month = {Sat Jun 01 00:00:00 EDT 2013}
}