Elimination of Photovoltaic Mismatching With Improved Submodule Differential Power Processing

Differential power processing (DPP) is a promising architecture to solve the issue caused by mismatches among photovoltaic (PV) submodules. To eliminate the mismatch power losses, this paper presents an optimized PV-to-bus DPP system with submodule-level individual maximum power point tracking (MPPT...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) Vol. 67; no. 4; pp. 2822 - 2833
Main Authors: Chu, Guanying, Wen, Huiqing, Yang, Yong, Wang, Yiwang
Format: Journal Article
Language:English
Published: New York IEEE 01.04.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Adaptive systems
Aging
Algorithms
Computer simulation
Converters
Differential power processing (DPP)
efficiency
Junctions
Mathematical model
Maximum power point trackers
Maximum power tracking
minimum-power tracking (MPT)
photovoltaic (PV) mismatch
Photovoltaic cells
Photovoltaic systems
Power conversion
Power loss
PV-to-bus
ISSN:0278-0046, 1557-9948
Online Access:Get full text
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Summary:Differential power processing (DPP) is a promising architecture to solve the issue caused by mismatches among photovoltaic (PV) submodules. To eliminate the mismatch power losses, this paper presents an optimized PV-to-bus DPP system with submodule-level individual maximum power point tracking (MPPT) and module-level minimum-power tracking (MPT) simultaneous implementation according to the built mathematical model of the power processed by DPP converters with respect to the string current. Furthermore, a flexible time-sharing algorithm is adopted to reduce the number of MPPT units. Compared with other solutions, such as PV optimizer, the proposed scheme can reduce the effects of mismatches to the minimum regardless of mismatch conditions. The system cost is reduced since only one adaptive MPPT controller is required. Besides, the system efficiency is improved due to the true MPPT implementation and MPT control. Both simulation and experimental tests are provided to validate the effectiveness of the proposed scheme.
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ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2019.2908612