Journal
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
Volume 3, Issue 4, Pages 881-891Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JESTPE.2015.2475607
Keywords
Differential power processing; digital control; distributed control; maximum power point trackers; photovoltaic systems
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Funding
- Advanced Research Projects Agency-Energy, U.S. Department of Energy [DE-AR0000217]
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This paper describes a distributed maximum power point tracking control scheme for photovoltaic (PV) systems at the submodule level. The system employs isolated differential power processing (DPP) converters that require no perturb and observe synchronization and little communication among power converters themselves. Design and benefits of this architecture with respect to control, communication, and converter efficiency are analyzed. Isolated dc-dc converter prototypes are constructed and employed within a string of series-connected PV submodules to experimentally validate the proposed control method. An experimental extraction efficiency of 99.12% is achieved for a three submodule connection with similar to 30% mismatch-a 10.19% improvement from the conventional, non-DPP architecture.
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